ALPHA 10/10P SERVICE MANUAL - Acoustic Psychos · ALPHA 10/10P SERVICE MANUAL Figure 3 Micro Block Diagram 3 through the amplifier due to C72 and 74 d.c. blocking capacitors and on

ALPHA 10/10P SERVICE MANUALALPHA 10/10P SERVICE MANUAL

1

ALPHA 10/10P SERVICE MANUAL

CIRCUIT DESCRIPTION

The mother PCB is common for both the A10 and A10P with the exception of the input mode switch and pre-ampoutput mute relay which are only fitted to the A10 and the power/standby LED and links to parallel the inputconnections to what would otherwise be the pre-amp output for use with a mono link. The amplifier is based on theD290/Alpha 9 design but with lower gain, a higher current and higher voltage driver stage and a high power outputstage. The current servo has been improved over the Alpha 9 to be output device independent. A micro supervisesthe amplifier state, switch state and remote control functions. Provision is made for an additional 3rd channel PCB tobe added with power supply and protection circuitry access.

Input stageThe input connections are taken either from the pre-amp connector, LK12X, or the external power amp input on theA10 depending on the position of SW1. On the A10P, the input is taken from the external power amp input only withprovision for a mono shorting link by having two parallel input connectors. On the A10, there is a mute relay on thepre-amp outputs which are always connected to the pre-amp connector, LK12X.The signal is passed through a low pass filter with a -3dB point of 550KHz at normal gain and 740KHz at low gain.The gain is selected by SW2. C72 and C74 are d.c. blocking capacitors with a -3dB point of 0.7Hz. A d.c. errorcorrection current is injected into the base of Q19 and 26 from the voltage servo Z3 and 4, to null any voltage offset atthe amplifier output.The input and voltage amplifier stages both run off regulated 15 Volt suppies. The input stage is an NPN differentialinput, Q18, 19, 25 and 26, with an adjustable current source, Q21 and 28 which sets the quiescent current through allthe stages but specifically the output stage. C37, R58, C49 and R66 keep the input stage and voltage amplifier stable.Q52, 53, 54 and 55 form a current mirror to ensure that the differential input is balanced during normal operation.

Voltage AmplifierThe voltage amplifier consists of another differential pair, Q48, 49, 50 and 51. Q48 and 50 are the positive pulling sideof the voltage amplifier output and Q49 and 51 pull negative via a current mirror Q8, 9, 10 and 11. The network C12,36, R74 and 77 give the current mirror gain to compensate for the fact that Q49 and Q51 is only driven from the low-impedance side of the input stage current mirror. The network ensures a fast, symmetrical slew rate of the voltageamplifier stage.Network C69, 70, R172, 174 ensure the overall stability of the amplifier by reducing the open loop gain at highfrequencies.

Second Voltage Amplifier and Driver Stage

Q33, 36, 41 and 44 are the next voltage amplifier stage with feedback applied from the output coupled to theiremitters. This stage runs on the full supply rail voltages and splits the level shifts the signal via Q2, 3, 5 and 6 to drivethe gates of the output MOSFETs, Q13, 14, 15 and 16. Q2 and 3 simply buffer the inverted signal at the collector ofQ36 to drive the low side MOSFETs, Q13 and 15. Q5 and 6 invert the inverted signal at the collector of Q41 and Q44to drive the high side MOSFETs, Q14 and 16. To ensure that the high side drive is able to swing far enough to ensurethe high side MOSFETs can be driven to saturation, a bootstrap, C5, D41 R57, C78 and D22 boosts the driver stagepower supply during positive excursions of the amplifier output. This is inactive at low output voltage swings as anydistortion induced by the network would be more audible at such levels.

Output Stage

Both the high and low side output devices feature over-current protection, Q17, 23, 24, 30 which clamps the gate ofthe MOSFET it protects. A high current is permitted through the MOSFET for a few milliseconds after which time thecurrent is throttled down to about 10A peak. A second current sensing network, Q32 and Q35 activates theover-current protection cut-out if the low side is current limiting for too long, a few hundred milliseconds. The currentsensing resistors do not reduce the transconductance of the MOSFETs because the driver stage is referenced to theMOSFET source. This means that the current through the driver stage is also sensed but this is insignificant as fas asover-current protection sensing is concerned.

Auto-bias


2

Figure 1Block Diagram of Power Amplifier

Sense Resistor

Comparitor Output

Measured Current (blue)

Other MOSFET

-ve MOSFET

50% 49% 52%

Bias correct Under Biassed Over Biassed

Figure 2 Auto-bias under dynamic conditions

The bias is regulated in two modes, one where these is no signal and one when signal is being split between the highand low side MOSFETs when driving a alternating signal into a load.Under static conditions, Z8 simply compares the sensed current, which includes the driver stage current, with a d.c.mode reference of 13mV. The sense resistor is 0.11 so this corresponds to a current of about 120mA, some of whichis driver current. The current through the MOSFETs is about 80mA at this point. The comparator output is level shiftedto drive the integrating current servos Z3 and 4. This adjusts the amplifier current so that, on average, the bias level isheld at the reference point.Under dynamic conditions, the low side drive will definitely be conducting more current than the reference (80mA) forhalf the signal cycle and will be switched off for the other half. The result is a rectangle wave output from thecomparator, Z4.

When the output stage is biassed correctly (class AB operation) the comparator output toggles when the currentthrough the sense resistor for the -ve MOSFET is equal to the d.c. mode static reference level and at the half waypoint of the signal. The result is a perfect square wave output from the comparator. Under these conditions, the +veMOSFET is also conducting the same amount of current at this point. If the bias level is lower than the reference, say,at zero (class B operation) then the -ve MOSFET will spend slightly less than half the time conducting at or above thereference level resulting in a rectangle wave output from the comparator at a duty cycle slightly less than 50%. If thebias level is higher than the reference then the -ve MOSFET will spend slightly more than half the time conducting ator above the reference level resulting in a rectangle wave output at a duty cycle slightly more than 50%. The changein duty cycle away from 50% causes the integrator, Z3 and Z4 to adjust the bias level via the bias adjustingtransistors, Q22 and 29.The integrator has a reference, the a.c. mode dynamic reference, for a bias point slightly higher than for a 50% dutycycle. This eliminates the possibility of the bias being slowly throttled due to component tolerance mismatch resultingin a reference which would pull the servo down. A high dynamic bias reference level simply stabilises the bias slightlyhigher than the static reference but a low dynamic reference causes the bias to drift down to complete throttle.This system works if the signal is a.c., symmetrical and is not a rectangle wave. Certainly, only a.c. signals are passed


3Figure 3 Micro Block Diagram

through the amplifier due to C72 and 74 d.c. blocking capacitors and on average the signal will be symmetrical. Anyshort-term asymmetry will be ironed out by the long time constant of the integrator.

Main Power Supply

The main power supply is regulated in two stages. First it is pre-regulated by Q1 and 4 to about 11V less than themain supply rails. This supply is made available to an option board. The maximum load on these supplies is 150mAfor less than 2W dissipation in Q1 and 4. These supplies are then regulated to +/-15V by Z1 and 2. These supplies areused by the input stages of the power amplifiers including any 3rd channel board, the pre-amplifier board and anoptional phono amplifier board. The positive voltage regulator, Z1, has a larger heatsink than Z2 because the phonoboard consumes much more current from the positive rail than from the negative rail.Control Micro

The control micro performs the following functions...‚ Switches the amplifier on or off,‚ Mutes the speakers #1 or #2 or the pre-amp output,‚ Monitors the heatsink temperature,‚ Monitors RF content of speaker outputs,‚ Handles the remote bus and infra red remote input,‚ Reports fault conditions to the main display and LED,‚ Reads the speaker and power switch positions. The control micro runs of the constant power supply from standby transformer, TX2. This enables the amplifier to beswitched on or off remotely from the remote bus or, in the case of the integrated amplifier, from an infra red remotecontrol. This power supply is intended to supply all the digital circuitry in the amplifier including any option boards.This is supplied at 8V to the other boards where it will be locally regulated to 5V as required.The micro communicates with the display board via a multi-master I2C bus. This bus is used to report amplifier andpower status to the display micro and remote control commands received. It is also possible for the display micro tocontrol functions on the power amplifier board. The option board also uses this bus to receive any remote controlcommands and communicate with the display micro.The external remote bus handles raw information from infra red sensors with no demodulating. The remote bus inputcan be echoed to the output through a buffer circuit. The incoming signal is demodulated by Z13. Raw signal is alsosent to the micro interrupt line, pin 12, for assessing the noise on the remote bus. In addition, any d.c. signal on theremote bus is sensed on pin 2 of the micro in when it is not being used as an output to mute the hardware remoteecho buffer. The micro must modulate any output it sends to this bus with a carrier (37KHz). The output will drive oneor two series infra red LEDs directly.

The list below shows how various fault conditions can be deduced simply from the Power LED behaviour.


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• On power up, the protection should be engaged. This is checked after 3 seconds on pin 9 of Z9. If it isn'thappening, the unit shuts down with flashing red.

• If the protection does not clear after about 16 seconds on power-up the unit shuts down to flashing red. Thisis usually caused by a voltage offset.

• Any main amp power loss detected on pin 26 after power-up causes a shut down to flashing red.• Any RF detected on pin 3 results on immediate shut down to flashing red.• Any protection fault detected after power up on pin 9 results in a flashing amber LED for about 16 seconds

max. If it has not cleared by then the unit is shut down to flashing red. Protection faults are caused by voltageoffset or over-current. Over-current should latch resulting in a shut down after 16 seconds. Voltage offsetsshould clear themselves if brief.

• A temperature fault on pin 25 results in the power LED flashing slow amber and can last indefinitely until itclears. When it clears the flashing will speed up until the protection times back in.

ALPHA 10P POWER AMP MAIN BOARD PARTS LIST

Ref No. Description Part No

C1 ELST 100U 100V 2N710B

C2 ELST 100U 100V 2N710B

C3 MLC 100N 50V X7R 10% SM 2C410

C4 ELST 100U 100V 2N710B

C5 ELST 100U 100V 2N710B

C6 ELST 22U 63V 2N622

C7 ELST 10U 50V 2N610

C8 ELST 22U 63V 2N622

C9 ELST 10U 50V 2N610

C10 ELST 10U 50V 2N610

C11 ELST 1U0 50V 2N510

C12 PPRO 4N7 63V 5% RA 2D247N

C13 SUPPR CAP 4N7 250V 2K247

C14 PPRO 150P 5% 63V RA 2D115

C15 ELST 10U 50V 2N610

C16 ELST 10U 50V 2N610

C17 ELST 10U 50V 2N610

C18 ELST TNC 10m 63V RA 40mm 2N910A

C19 ELST TNC 10m 63V RA 40mm 2N910A

C20 PPRO 4N7 63V 5% RA 2D247N

C21 PPRO 4N7 63V 5% RA 2D247N

C22 ELST 100U 25V 2N710

C23 ELST 100U 25V 2N710

C24 ELST 100U 25V 2N710

C25 ELST 100U 25V 2N710

C26 ELST 100U 25V 2N710

C27 ELST 100U 25V 2N710

C28 MLC 470P 100V NPO 5% SM 2C147

C29 MLC 470P 100V NPO 5% SM 2C147

C30 MLC 470P 100V NPO 5% SM 2C147

C31 MLC 100N 50V X7R 10% SM 2C410

C32 ELST 22U 63V 2N622

C33 ELST 22U 63V 2N622

C34 MLC 100N 50V X7R 10% SM 2C410

C35 PPRO 150P 5% 63V RA 2D115

C36 PPRO 4N7 63V 5% RA 2D247N

C37 PPRO 1N0 5% 63V RA 2D210

C38 PPRO 680P 63V 5% RA 2D168

C39 PPRO 680P 63V 5% RA 2D168

C40 MLC 10N 50V X7R 10% SM 2C310

C41 MLC 10N 50V X7R 10% SM 2C310

C42 MLC 10N 50V X7R 10% SM 2C310

C43 MLC 10N 50V X7R 10% SM 2C310


C45 ELST 10U 50V 2N610



C48 ELST 3M3 25V 2N833

C49 PPRO 1N0 5% 63V RA 2D210

C50 ELST 1U0 50V 2N510

C51 ELST 220U 16V 2N722

C52 ELST 220U 16V 2N722

C53 ELST 220U 16V 2N722

C54 ELST 220U 16V 2N722

C55 PCRB 100N 100V 10% RA 5mm 2H410

C56 PCRB 100N 100V 10% RA 5mm 2H410

C57 PCRB 100N 100V 10% RA 5mm 2H410

C58 PCRB 100N 100V 10% RA 5mm 2H410

C59 PCRB 100N 100V 10% RA 5mm 2H410

C60 PCRB 100N 100V 10% RA 5mm 2H410

C61 PPRO 100P 63V 5% RA 2D110N


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C62 PPRO 100P 63V 5% RA 2D110N

C63 PPRO 150P 5% 63V RA 2D115

C64 PPRO 330P 5% 63V RA 2D133

C65 PPRO 150P 5% 63V RA 2D115

C66 PPRO 330P 5% 63V RA 2D133

C67 PEST 15N 63V 5% 2K315

C68 PEST 15N 63V 5% 2K315

C69 PSTY 56P 160V ENCAP 1PF% 2F056

C70 PSTY 56P 160V ENCAP 1PF% 2F056

C71 ELST NON POLAR 10UF 35V 2U610




C75 PEST 47N 63V 10% 2K347

C76 PEST 47N 63V 10% 2K347

C77 PEST 47N 63V 10% 2K347

C78 PEST 47N 63V 10% 2K347



C81 MLC 22P 100V NPO 5% SM 2C022

C82 MLC 22P 100V NPO 5% SM 2C022

C83 ELST 100U 25V 2N710

C84 MLC 100N 50V X7R 10% SM 2C410

C85 MLC 100N 50V X7R 10% SM 2C410

C86 MLC 100N 50V X7R 10% SM 2C410

C87 MLC 100N 50V X7R 10% SM 2C410

C88 MLC 100N 50V X7R 10% SM 2C410

C89 MLC 100N 50V X7R 10% SM 2C410

C90 ELST 10U 50V 2N610

C91 PPRO 680P 63V 5% RA 2D168

C92 MLC 10N 50V X7R 10% SM 2C310

C93 MLC 1N0 50V X7R 10% SM 2C210

C94 MLC 10N 50V X7R 10% SM 2C310

C95 ELST 10U 50V 2N610

C96 ELST 10U 50V 2N610

C97 MLC 100N 50V X7R 10% SM 2C410

C98 MLC 10N 50V X7R 10% SM 2C310

C99 CERD 10PF 63V 10% 2A010

C100 CERD 10PF 63V 10% 2A010

D1 ZENER 15V 400MW 3C11504

D2 ZENER 15V 400MW 3C11504

D3 ZENER 10V 400MW 3C11004

D4 ZENER 10V 400MW 3C11004

D5 ZENER 10V 400MW 3C11004

D6 ZENER 10V 400MW 3C11004

D7 ZENER 10V 400MW 3C11004

D8 ZENER 10V 400MW 3C11004

D9 ZENER 10V 400MW 3C11004

D10 RECTIFIER 6A40 6A 400V 3B6A40




D14 RECTIFIER 1N4003F 1A 200V 3B4003


D16 SSDIODE 1N4148 75V 3A4148

D17 SSDIODE 1N4148 75V 3A4148



D20 SSDIODE 1N4148 75V 3A4148






D26 SSDIODE 1N4148 75V 3A4148


D28 SSDIODE 1N4148 75V 3A4148

D29 ZENER 4V7 400MW 3C04704

D30 SSDIODE 1N4148 75V 3A4148

D31 SSDIODE 1N4148 75V 3A4148

D32 SSDIODE 1N4148 75V 3A4148

D33 SSDIODE 1N4148 75V 3A4148

D34 SSDIODE 1N4148 75V 3A4148

D35 SSDIODE 1N4148 75V 3A4148

D36 SSDIODE 1N4148 75V 3A4148

D37 SSDIODE 1N4148 75V 3A4148

D38 SSDIODE 1N4148 75V 3A4148

D39 ZENER 12V 3W SM 3C03C12

D40 SSDIODE 1N4148 75V 3A4148


D42 SSDIODE 1N4148 75V 3A4148

D43 ZENER 5V6 400MW 3C05604



D46 SSDIODE 1N4148 75V 3A4148

D47 SSDIODE 1N4148 75V 3A4148


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D48 ZENER 4V7 400MW 3C04704

D49 SSDIODE 1N4148 75V 3A4148

D50 ZENER 5V6 400MW 3C05604

F4 FUSE 20mm 2.5A AS C12256

F4 INS COVER PCB FUSEHOLDER F022

F4 FUSEHOLDER 20mm PCB 8S004

F5 FUSEHOLDER 20mm PCB 8S004

F5 INS COVER PCB FUSEHOLDER F022

HS1 HEATSINK CLIP TO220 13/8.6 DC/W F006

HS1 HEATSINK TO220 13 DEGC/W F005

HS3 HEATSINK TO220 CLIP 23DEG/W F004

HS5 CARBON THERMAL PAD E816MC

HS5 HEATSINK TO247 CLIP 2DEGC/W E803HK E803HK















L1 INDUCT 2U2 15x25mm AD2018 7D002A

L2 INDUCT 2U2 15x25mm AD2018 7D002A

L3 27mH INDUCTOR 7D327

LED1P LED RED/GREEN 5MM 3D002

LK9P JUMPER 4-WAY LEAD L836CA

O1 OPTO ISOLATOR 4N35 5T4N35

PCB PRINTED CIRCUIT BOARD L829PB

Q1 TRANS AUDIO DRIVER N 2SC5248 4B5248



Q4 TRANS AUDIO DRIVER P 2SA1964 4B1964



Q7 TRANS LF SS P SM BC856B 4A856B

Q8 TRANS LF SS N SM BC846B 4A846B




Q12 TRANS LF SS N SM BC847B 4A847

Q13 TRANS POWER MOSFET IRPF360LC 4K360



















Q32 TRANS LF SS N 2SC2547 4A2546

Q33 TRANS LF SS P 2SA1085 4A1085









Q42 TRANS LF SS N SM BC847B 4A847












7











R1 RES MF FU W3 1R0 5% NFR25 1G810



R4 RES CF 1W 330R 5% 1E133

R5 RES CF 1W 330R 5% 1E133

R6 RES CF W2 100R 5% 1D110

R7 RES MF FU W3 470R 5% NFR25 1G147



R10 RES MF FU W3 220R 5% NFR25 1G122

R11 RES MF FU W3 1K0 5% NFR25 1G210

R12 RES MF FU W3 470R 5% NFR25 1G147

R13 RES MF FU W3 470R 5% NFR25 1G147

R14 RES MF FU W3 220R 5% NFR25 1G122

R15 RES MF FU W3 220R 5% NFR25 1G122


R17 RES MF FU W3 470R 5% NFR25 1G147

R18 RES MF FU W3 470R 5% NFR25 1G147




R22 RESISTOR SM W8 220R 1% 1A122A


R24 RESISTOR SM W8 2K4 1% 1A224A


R26 RESISTOR SM W4 22K 2% 1A322



R29 RESISTOR SM W4 1K5 2% 1A215






R35P RESISTOR SM W4 0R0 2% 1A000














R48 RESISTOR SM W4 180R 2% 1A118

R49 RES CF W2 100R 5% 1D110

R50 RES MF FU W3 100R 5% NFR25 1G110



R53 RES CF 2W 220R 5% 1C122

R54 RES MF FU W3 100R 5% NFR25 1G110



R57 RES CF 2W 220R 5% 1C122


R59 RESISTOR SM W4 1M0 2% 1A510


















8












R84 RES MO 3W 5% 0R22 KOASPR3 1Q922


























R110 RES CF 1W 1R5 5% 1E815

R111 RES CF 1W 1R5 5% 1E815

R112 RES CF 1W 5R6 5% 1E856

R113 RES CF 1W 5R6 5% 1E856

























R138 RES MF FU W3 220R 5% NFR25 1G122

R139 RES MF FU W3 100R 5% NFR25 1G110

R140 RES MF FU W3 100R 5% NFR25 1G110

R141 RES MF FU W3 220R 5% NFR25 1G122


R143 RES MF FU W3 220R 5% NFR25 1G122

R144 RES MF FU W3 100R 5% NFR25 1G110

R145 RES MF FU W3 100R 5% NFR25 1G110

R146 RES MF FU W3 220R 5% NFR25 1G122


R148 RES MF FU W3 1K0 5% NFR25 1G210

R149 RES MF FU W3 1K0 5% NFR25 1G210

R150 RES MF FU W3 470R 5% NFR25 1G147

R151 RES MF FU W3 1K0 5% NFR25 1G210

R152 RES MF FU W3 1K0 5% NFR25 1G210

R153 RES MF FU W3 470R 5% NFR25 1G147







9












R170 RES MF W4 22K 1% 1H322

R171 RES MF W4 22K 1% 1H322









R180 RESISTOR SM W8 47K 1% 1A347A

R181 RESISTOR SM W8 47K 1% 1A347A


















R199 RES MF FU W3 1R0 5% NFR25 1G810

R200 RES CF 1W 2K7 5% 1E227





R205 RES CF 1W 5% 6K8 1E268













R218P RESISTOR SM W4 220R 2% 1A122




R221 RES CF 1W 470R 5% 1E147



R224 RES MF FU W3 10R 5% NFR25 1G010



R227 RES MF W4 10R 1% 1H010

R228 RES CF 1W 2K7 5% 1E227

R229 RES CF 1W 2K7 5% 1E227











RLY1 RLY SPST 24V SPKR A213





10

RLY6 RELAY MAINS 24V 10A A212

RLY7 RELAY MAINS DPDT 12V 5A A211

SH1 MAINS EMC SHIELD E5402

SH2 PHONO EMC SHIELD E808MC

SK1 PHONO SKT 4-WAY EMC GOLD 8D225

SK2 CAMCON BINDING POST 4WAY GOLD 8D417G

SK3 CAMCON BINDING POST 4WAY GOLD 8D417G

SK4 IEC MAINS CONN PCB INS PX 8A001

SK5 STEREO JACK PCB 8D301

SK6 22-WAY FFC CONN 8K8022

SK7 CAGE CLAMP 16A 3 WAY 8Q001

SK8 CAGE CLAMP 16A 4 WAY 8Q002

SK9 CAGE CLAMP 16A 1 WAY ARC003-236 8Q003

SK10 MIN JACK DUAL 3.5mm HSJ1002-01-1020 8D302

SKT1 JST 6 WAY HEADER 8K709

SW2 SW PUSH 2PCO A1008




TH2 THERMISTOR MAINS SURGE 1T004

TH3 THERMISTOR MAINS SURGE 1T004

TX1 ALPHA10 AMP POWER TX 230V L831TX

TX2 ALPHA 10 AMP 230V/115V TRANSFORMER L825TX

X1 CER RESON 4.00MHz 7W005

Y1 TX WIRE RESTRAINT F185

Y2 TX WIRE RESTRAINT F185

Z1 IC VREG POS LM317T 5D317T

Z2 IC VREG POS LM337T 5D337

Z3 IC AUDIO SM DUAL TL072 5B072D


Z5 IC COMPARITOR TA7317P 5M7317

Z6 IC VREG POS 7805 5D7805


Z8 IC COMPARITOR SM DUAL LM393A 5M393AD

Z9 IC SOCKET 28 NARROW 8S028N

Z9 IC CMOS MICRO HT48R30 28-DIP-B-0 5B483028

Z10 IC THERMOSTAT SM LM56CIM 5M56

Z11 IC THERMOSTAT SM LM56CIM 5M56

Z12 IC CMOS EPROM 24C02 SM 5G2402

Z13 IC COMPARITOR SM DUAL LM393A 5M393AD

ALPHA 10 PREAMPLIFIER BOARD PARTS LIST

Ref No. Description Part No.


C2 ELST 22U 63V 2N622


C4 ELST 22U 63V 2N622

C8 MLC 1N0 50V X7R 10% SM 2C210

C9 MLC 1N0 50V X7R 10% SM 2C210

C10 PPRO 680P 5% 63V RA 2D168

C11 PPRO 680P 5% 63V RA 2D168

C13 MLC 47P 100V NPO 5% SM 2C047

C14 MLC 47P 100V NPO 5% SM 2C047

C15 MLC 47P 100V NPO 5% SM 2C047

C16 MLC 47P 100V NPO 5% SM 2C047

C17 MLC 47P 100V NPO 5% SM 2C047

C18 MLC 47P 100V NPO 5% SM 2C047

C19 MLC 47P 100V NPO 5% SM 2C047

C20 MLC 47P 100V NPO 5% SM 2C047

C21 MLC 47P 100V NPO 5% SM 2C047

C22 MLC 47P 100V NPO 5% SM 2C047

C23 MLC 47P 100V NPO 5% SM 2C047

C24 MLC 47P 100V NPO 5% SM 2C047

C25 MLC 47P 100V NPO 5% SM 2C047

C26 MLC 47P 100V NPO 5% SM 2C047

C31 ELST 22U 63V 2N622

C32 ELST 22U 63V 2N622

C33 MLC 1N0 50V X7R 10% SM 2C210

C34 MLC 1N0 50V X7R 10% SM 2C210

C35 MLC 1N0 50V X7R 10% SM 2C210

C36 MLC 1N0 50V X7R 10% SM 2C210

C37 MLC 1N0 50V X7R 10% SM 2C210

C38 MLC 1N0 50V X7R 10% SM 2C210

D1 ZENER 6V8 400MW 3C06804

D2 ZENER 6V8 400MW 3C06804

LK1 JUMPER 8-WAY LEAD FOR A10 PRE-AMP L823CA

LK2 JUMPER 8-WAY LEAD FOR A10 PRE-AMP L832CA

PCB PRINTED CIRCUIT BOARD L832PB

PL6 16 WAY DIL PIN HEADER 8K6316





11





































































SK7 22-WAY FFC CONN 8K8022

SK8 32-WAY FFC CONN VERT 8K8032

Z3 IC OPAMP DUAL SM OPA2134PA 5B2134

Z4 IC OPAMP DUAL SM OPA2134PA 5B2134

Z6 IC HCMOS SM MAX 4051 5K4051M








Z14 IC AUDIO DUAL VOLPOT LM1972 5C1972

ALPHA 10 DISPLAY BOARD PARTS LIST


12

Ref No. Description Part No.

C1 CERD 100N 63V 20% RA 2A410

C2 ELST 470U 25V RA 2N747

C3 CERD 100N 63V 20% RA 2A410

C4 CERD 100N 63V 20% RA 2A410

C5 CERD 100N 63V 20% RA 2A410

C6 ELST 220U 16V 2N722

C8 CERD 100N 63V 20% RA 2A410

D1 SSDIODE 1N4148 75V 3A4148

D2 SSDIODE 1N4148 75V 3A4148

D3 SSDIODE 1N4148 75V 3A4148

D4 SSDIODE 1N4148 75V 3A4148

D5 SSDIODE 1N4148 75V 3A4148

D6 SSDIODE 1N4148 75V 3A4148

D7 SSDIODE 1N4148 75V 3A4148

D8 SSDIODE 1N4148 75V 3A4148

D9 SSDIODE 1N4148 75V 3A4148

D10 SSDIODE 1N4148 75V 3A4148

D11 SSDIODE 1N4148 75V 3A4148

L831PB PRINTED CIRCUIT BOARD L831PB

LED1 LED GREEN 5MM 3D001







LED100 LED RED/GREEN 5MM 3D002

LK1 LINK PLAIN 10mm 1X010A

LK3 JUMPER 3 WAY x 125mm L815CA

M1 NORITAKE ITRON CU20025RCPB-U1J B1010

Q1 TRANS LF SS P BC557B 4A557

Q2 TRANS MOSFET SW ZVNL120A 4K120

R1 RES MF FU W3 3R3R 5% NFR25 1G833

R2 RES MF W4 150R 1% 1H115

R3 RES MF W4 150R 1% 1H115

R4 RES MF W4 150R 1% 1H115

R5 RES MF W4 150R 1% 1H115

R6 RES MF W4 150R 1% 1H115

R7 RES MF W4 150R 1% 1H115

R8 RES MF W4 150R 1% 1H115

R9 RES MF W4 4K7 1% 1H247

R10 RES MF W4 4K7 1% 1H247

R11 RES MF W4 10K 1% 1H310

R12 RES MF W4 10K 1% 1H310

R13 RES MF W4 150R 1% 1H115

R14 RES MF W4 330R 1% 1H133

R15 RES MF W4 4K7 1% 1H247

R16 RES MF W4 4K7 1% 1H247

R17 RES MF W4 10K 1% 1H310

R18 RES MF W4 100R 1% 1H110

R19 RES MF W4 100R 1% 1H110

R20 RES MF W4 100K 1% 1H410

R21 RES MF W4 100R 1% 1H110

R22 RES MF W4 100K 1% 1H410

RP1 RES NETWORK 100Kx8 COMMON 1V410

RX1 REMOTE CONTROL RECEIVER SBX1610-62 38KHZ B2103

SK1 22-WAY FFC CONN HORIZ 8K8122

SK2 22-WAY FFC CONN HORIZ 8K8122

SK3 EC16B2414 A1211

SW1 TACT SWITCH 2-PIN LOW PROF A1504











X1 CER RESON 4.00MHz 7W005


Z2 40 PIN IC SOCKET 8S040

Z2 IC CMOS MICRO PIC16C65 5H16C65

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE

FilenameECO No. DESCRIPTION OF CHANGE

J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\L829ct1_6.prj

A & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PB

Alpha 10 Amp Main

Circuit Diagram

L829CT1SJB10-Jul-1998

INITIALSDate Printed 1 5Sheet of

Notes:

D1

15V 400MW

R1

1R0

FU

R7

470R

FU

D3

10V

400

MW

+

C1

100U

EL

100

VVinI

AD

JA

Vout O

Z1LM317T

R22

220R

SM

1%

R24

2K4

SM1%

+

C6

22U

EL

+15V

+

C7

10U

EL

+15V Regulator

D2

15V 400MW

R2

1R0

FU

R8

470R

FU

D4

10V

400

MW

+

C2

100U

EL

100

V

R23

220R

SM

1%

R25

2K4

SM1%

+

C8

22U

EL +

C9

10U

EL

VinI AD

JA

Vout O

Z2LM337T

-15V Regulator

-15V

D14

1N40

03F

D15

1N40

03F

-SUP

+SUP

C20

4N7

PP

C21

4N7

PP

PAN

1

AT

E_P

AD

NA

N1

AT

E_P

AD

PPR

E1

AT

E_P

AD

NPR

E1

AT

E_P

AD

NSUP1

ATE_PAD

PSUP1

ATE_PAD

PGND1

ATE_PAD

HS

HS1ATO220HS13REG

HS3A

TO220HS23REG

Q12SC5248

Q42SA1964

HS6NTO220HS23TR

R3

1R0

FU

RLY1ARLY SPST SPKR

RLY2ARLY SPST SPKR

RLY5NA

RLY 51SB12T

RLY5NB

RLY 51SB12T

Output

VI Latch VI Cut

ABiasRefInput

PWRAMPLl829ct3_6.SCH

Output

VI Latch VI Cut

ABiasRefInput

PWRAMPRl829ct4_6.SCH

R26

22K SM

R36

47K

SM +

C22

10U

EL

RLY3A

RLY SPST SPKR

RLY4ARLY SPST SPKR

R47

68K SM

R48

180R SM

ABSUP

-SUP

VI Cut-out latch

VIRESET1

ATE_PAD

SGND1

ATE_PAD

EM

C

1

N

F

SK1A

PHO

NO

4G

N

F

SK1BPH

ON

O4GL&R Inputs

R27

22K

SM

LOut

ROut

84

Z3CTL072 SM

84

Z4CTL072 SM

+15V

C38680P PP

C39680P PP

123

SW1NA2PCO_VERT

456

SW1NB2PCO_VERT

Pre_OutputsTop+

Top-

SK2ACAMCON_G

Bot+

Bot-

SK2BCAMCON_G

CHASS

SK2CCAMCON_G

Top+

Top-

SK3A

CA

MC

ON

_G

Bot+

Bot-

SK3B

CA

MC

ON

_G

CHASS

SK3CCAMCON_G

C29

470P

SM

C30

470P

SM

C40

10N

SM

C41

10N

SM

C42

10N

SM

C43

10N

SM

SPKB1

ATE_PAD

SPKA1ATE_PAD

SPKB2ATE_PAD

SPKA2ATE_PAD

PRE1ATE_PAD

PRE2ATE_PAD

HS8NTO220HS23TR

+PRE

-PRE

LVProtRVProt

ACDetFault

Powerup

FAN

RESET

CONTROLl829ct2_6.SCH

VinI

GN

DG

Vout O

Z67805

C31

100N

SM

+

C10

10U

EL

+5VControl Supply

L

N

E

NE

L

SK4

IEC3

C44

4N7 MAINS

RLY6A

RLY SPDT 24V

D18

1N4003F

D19

1N4003F

+

C48

3M3

EL

C85

100N

SM

VinI

GN

DG

Vout O

Z77808

C86

100N

SM

C464N7 MAINS

C474N7 MAINS

+

C45

10U

EL

+8V

HS

HS2NATO220HS08REG

230V

115V

0VBLUE

GREEN

BLUE

BLACK

BROWN

ORANGE

GRN/YEL

TX1L831TX

F4

AS2A5

F5

AS4A_115V

+8V

-15V

FaultACDet

ACDet

R71

4K7

SM

Q12BC847B

+UREG

+UREG

EMC Shield

SH1

EMCMAINS

1

23456

SKT1

JST 6W HEADER

ACDet+SUP

+15V

-15V-SUP

3rd Ch. Power

Digital Supply

12345678

SK11

WTRAP2.5X8V

+15V

-15V

Pre-Amp Audio Input

Kit Masks:1) For Integrated Amp use... N, F inclusive2) For Power Amp use... P,S,F inclusive

Designators ending in...N - For integrated amp only,P - For power amp only,R - For power amp with remote only,S - For power amp with no remote only,X - Other end of wire link.

! !

!

!

!

BARCODE LABEL

BARCD

BARCODE

S.J.B.

SJB

SJB

Update Box

UPDTBX

UPDATE_BOX

Photo Strip

PS

PHOTO_STRIP

FD_1

FIDUCIAL

FD_2

FIDUCIAL

PD5TOOLING

PD7TOOLING

PD8TOOLING

Replace with sametype component only

!

LHC 2

RHC 31

4

L 5

6

R 7

SK5

HPSKT

R4

330R 1W CF

R5

330R 1W CF

R6

100R

W2

CF

R49

100R

W2

CF

LOut

ROut

D16

BA

S16

W S

M

Blue 1

Dark Grey 2

Orange 3

SK7

CAGECLAMP3

Grey 1

Light Green 2

Light Green 3

Grey 4

SK8

CA

GE

CLA

MP

4

Y1TX WIRE CLIP

HP1

HP2

R81

180R

SM

R82

180R

SM

UREG1

ATE_PAD PDIG1ATE_PAD

PMPU1

ATE_PAD

TH3

PTHMAINS

+

C32

22U

EL

+

C33

22U

EL

SCREENSCREENSCREENSCREEN

SW1NC

2PCO_VERT

Chassis Connection

FIX3

R22

8

2K7

1W C

F

R22

9

2K7

1W C

F

EMC ShieldSH2

EMCPHONO

AC1ATE_PAD

AC2ATE_PAD

TXGNDATE_PAD

TXNATE_PAD

TX115ATE_PAD

TX230ATE_PAD

LIV

EA

TE

_PA

D

NEUTRALATE_PAD

D10 6A

40

D11

6A40

D12

6A40

D13

6A40

230V

115V

12

2

5

70V

13

11

11V

0V

11V

TX2L825TX

RLY7A

RLY DPDT 12V

RLY

7BR

LY D

PD

T 1

2V

RLY

7C

RLY

DP

DT

12V

C13

4N7

MA

INS

R35P

0R0 SM

R65P

0R0 SM

R80P 0R0 SM

R83P 0R0 SM

Q42BC847B

D44

24V 3W SM

D45

1N4003F

R35

1K0 SM

Q59F2SC5248

Q39BC849B

12

SKT3

MOLEX2MV

Fan

C89

100N

SM

D46

BA

S16

W S

MD

47

BA

S16

W S

M

R23

0

47K

SM

C87

100N

SM

LOut

ROut

+UREG

R23

1

47K

SM C88

100N

SM

Fan R232

1K0 SM

Issue BoxDrilling Detail

DD1

DD_ISSUE

FIX1

FIX2

FIX4 FIX5 FIX6 FIX7

FANOUTATE_PAD

Green1SK9

CAGECLAMP1

R29

1K5

SM

D11

5VA

TE

_PA

D

D24

0VA

TE

_PA

D

ACD1ATE_PAD

ACD2ATE_PAD

R19

9

1R0

FU

!

Q7BC856B

Q60BC859B

R208

470R SM

Fault

C94

10N SM

R128

22K SM

R20

122

K S

M

+C95

10U

EL

Y2TX WIRE CLIP

+

C96

10U

EL R202

100K SMD42

BAS16W SM

+

C90

10U

EL

R21

7

10K

SM

D50

5V6

400M

WD49

BAS16W SM

R216

1K0 SM

Reset Circuit

TH2 PTHMAINS

C28470P SM

SJB

Hardware Remote RX

PCB

PCB

L829PB

C6 & C8 change from 10u to 22u

2SJB

26-9-97

22-9-9797_1085

97_1086

SJB No Change

3

22-10-9797_1096

SJB HS2N change to larger size11-11-9797_1102

4

C101

47N PE

5

6

+ C1810M EL 63V

+ C1910M EL 63V

Paper MarkerA2 Horizontal

DDH

DD_A2H

Paper MarkerA2 Vertical

DDV

DD_A2V

FR4, 2 OZ CuPCB MATERIAL

DDM

FR4_2OZ

FIX8 FIX9

Q_3

0

Q_4

7

Q_48

DetailDrilling

DDD

DRILL_DWG

Q_55

Q_56

Q_57

R224

10R MF

12

SKT2

MOLEX2MV

SJB PCB Issue 2 to 3 changes9-7-9898_1042

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE


J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\l829ct3_6.SCH


Alpha 10 Amp L Ch.

Circuit Diagram



Notes:

Output

VI Latch

VI Cut

Q13

IRFP360LC

Q14

IRFP360LC

R50

100R FU

R84

0R22

3W

MO

R85

0R22

3W

MO

+

C51

220U

EL

R92

47R

SM

R9

220R

FU

R86

0R22

3W

MO

R87

0R22

3W

MO

R93

47R

SM

R10

220R FU

Q17BC849B

R10

2

68K

SM

R103

68K SM

+

C23

100U

EL

R94

150R

SM

R10

8

1K2

SM

R11

1K0

FU

R104

120K SM

R37

22K SM

L1 2U2H LAC

R110

1R5 1W CF

VI Cut-out

+V

I Pro

tect

ion

-VI P

rote

ctio

n

3

21

Z8A

LM393A SM

R51

10R FU

R1125R6 2W CF#A

C55100N PC

R52

10R FU

ABiasRef

Q402SC2547

R68

10K

SM

R11

8

33K

SM

D5

10V

400

MW

R12

9

220R

SM

R13

0

220R

SM

Q22SC5248

R138

220R FUR

148

1K0

FU

R14

9

1K0

FU

C61

100P

PP

R131

220R SM

R132

220R SM

D6

10V 400MWQ52SA1964

R13

9

100R

FU

R14

0

100R

FU

R15

0

470R

FU

R15

4

2K2

SM

R15

5

2K2

SM

Q412SC2547

Q332SA1085

C63

150P PP

R12

470R

FU

R13

470R

FU

R15

8

1K5

SM

+SUP

-SUP

C56100N PC

C57

100N

PC

Q48BC856B

Q49BC856B

R16

0

100R

SM

R72

100R

SM

Q8BC846B

Q9BC846B

R73

100R

SM

R74

100R

SM

Q18BC849B

Q19BC849B

Q52BC859B

R16

1

100R

SM

+15V

R16

4

560R

SM

1%

Q20BC849B

Q21BC849B

R16

6

2K2

SM

R11

9

33K

SM

-15V

R172

10R SM

C69X

56P PS

3

21

Z3ATL072 SM

R176

470K SM

R17

7

470K

SM

C71

10U NP

R38

47K

SM

C75

47N PE

R59

1M0

SM

C64

330P

PP

R18

0

47K

SM

1%

R182

2K7 SM

C72

10U

NP

Input

ABSUP

5

67

Z3B

TL072 SM

R30

120K

SM

R18

4

100K

SM

R61

2M2 SM

Bias Level detector

Auto-Bias Servo

Voltage Servo

OUTPUT1

ATE_PAD

INPUT1

ATE_PAD

VSE

RV

O1

AT

E_P

AD

ISE

RV

O1

AT

E_P

AD

STABLE1

ATE_PAD

Bootstrap

1

2

3

SW2A2PCO

R18

7

8K2

SM1%

Gain 29dB or 28.3x

R141

220R FU

R75

1K0

SM

D31

BA

S16W

SM

R12

0

33K

SM

D21

1N4003F

R19

322

R S

M

R19

4

22R

SM

Q53BC859B

D32

BA

S16

W S

M

HS7TO220HS23TR

HS10TO220HS23TR

HS5TO247HS2.8DEGC/W

HS9

TO

247H

S2.

8DE

GC

/W

Q_3 QP

AD

Q_4

QPAD

Q_5QPAD

Q_7

QPAD

Q_8QPAD

Q_10

QPAD

Q_11QPAD

Q_12QPAD

Q_13

QPAD

Q_29

QPAD

!

!

!

!

!

!

!

!

!

!

!

!


!

R13

7

100K

SM

D17

BA

S16

W S

M

+

C4

100U

EL

100

VC

76

47N

PE

R53

220R

2W

CF

D39

12V

3W

SM

C79

10U NP

R17

0

22K

MF

C14

150P PP

R99

470R

SM

C37

1N0 PP

R58

47R SM

R67

47R

SM

IQ1ATE_PAD

C12

4N7

PP

+

C52

220U

EL

Q322SC2547

Q23BC849B

SJB

22-9-97

C64 change from 220P to 330P

Hardware Remote RX 2SJB

26-9-97

97_1085

97_1086

SJB R50 change from 10R to 100R

3

22-10-9797_1096

C99

10P

SM

#A

SJB R61 & 168 changed. C99 added.11-11-9797_1102

4

C1021N0 SM

R24

0

100R

SM

5

6

Q_41QPAD

R39

4K7

SM

Q22BC849B

1

3 4

6

O2 TLP181 SM

R60 1K8 SM

R115

10K SM

C104

100N SM

Q_6

Q_1

9

Q_4

3

R168 2K4 SM

C6710N SM

BSRef

Q_49

Q_5

0

Q_58 Q_59

Q_6

0

C68100P PPS SM

C106100P PPS SM


1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE




Alpha 10 Amp R Ch.

Circuit Diagram



Notes:

Output

Q15

IRFP360LC

R54

100R FU

R90

0R22

3W

MO

R91

0R22

3W

MO

R96

47R

SM

R15

220R FU

Q24BC849B

R106

68K SM

L2 2U2H LAC

R111

1R5 1W CF

-VI P

rote

ctio

n

5

67

Z8B

LM393A SM

R55

10R FU

R1135R6 2W CF#A

C58100N PC

ABiasRef

Q432SC2547

R69

10K

SM

R12

1

33K

SM

D7

10V

400

MW

R13

3

220R

SM

R13

4

220R

SM

Q32SC5248

R143

220R FUR

151

1K0

FU

R15

2

1K0

FU

C62

100P

PP

Q62SA1964

R14

4

100R

FU

R14

5

100R

FU

R15

3

470R

FU

R15

6

2K2

SM

R15

7

2K2

SM

Q442SC2547

Q362SA1085

C65

150P PP

R17

470R

FU

R18

470R

FU

R15

9

1K5

SM

+SUP

-SUP

C59100N PC

C60

100N

PC

Q50BC856B

Q51BC856B

R16

2

100R

SM

R76

100R

SM

Q10BC846B

Q11BC846B

R77

100R

SM

R78

100R

SM

Q25BC849B

Q26BC849B

Q54BC859B

R16

3

100R

SM

+15V

R16

5

560R

SM

1%

Q27BC849B

Q28BC849B

R16

7

2K2

SM

R12

2

33K

SM

-15V

R174

10R SM

C70X

56P PS

3

21

Z4ATL072 SM

R178

470K SM

R17

9

470K

SM

C73

10U NP

R41

47K

SM

C77

47N PE

R62

1M0

SM

C66

330P

PP

R18

1

47K

SM

1%

R183

2K7 SM

C74

10U

NP

Input

ABSUP

5

67

Z4B

TL072 SM

R64

2M2 SM

Bias Level detector

Auto-Bias Servo

Voltage Servo

OUTPUT2

ATE_PAD

INPUT2

ATE_PAD

VSE

RV

O2

AT

E_P

AD

ISE

RV

O2

AT

E_P

AD

STABLE2

ATE_PAD

+

C5

100U

EL

100

V

4

5

6

SW2B2PCO

R18

8

8K2

SM1%

Gain 29dB or 28.3x

R146

220R FU

R79

1K0

SM

D33

BA

S16W

SM

R12

3

33K

SM

D22

1N4003F

R19

522

R S

M

R19

6

22R

SM

Q55BC859B

D34

BA

S16

W S

M

HS13TO220HS23TR

HS14TO220HS23TR

HS12

TO

247H

S2.

8DE

GC

/W

Q_16 QP

AD

Q_17

QPAD

Q_18QPAD

Q_20

QPAD

Q_21QPAD

Q_22QPAD

Q_23

QPAD

Q_24QPAD

Q_25QPAD

Q_26

QPAD

!

!

!

!

!

!

!

!

! !

!


!

R19

7

100K

SM

Bootstrap

!

D26

BA

S16

W S

M

C78

47N

PE

R57

220R

2W

CF

D41

12V

3W

SM

C35

150P PP

R10

1

470R

SM

C80

10U NP

R17

1

22K

MF

C49

1N0 PP

R66

47R SM

R11

4

47R

SM

IQ2ATE_PAD

C36

4N7

PP

+

C54

220U

EL

VI Latch

VI Cut

+

C24

100U

EL

R97

150R

SM

R10

9

1K2

SM

R16

1K0

FU

R107

120K SM

R40

22K SM

VI Cut-out

!

Q352SC2547

Q16

IRFP360LC

R88

0R22

3W

MO

R89

0R22

3W

MO

+

C53

220U

EL

R95

47R

SM

R14

220R

FU

R10

5

68K

SM

+V

I Pro

tect

ion

R56

10R FU

R135

220R SM

R136

220R SM

D8

10V 400MW

HS11TO247HS2.8DEGC/W

!

Q30BC849B

SJB

22-9-97

C66 change from 220P to 330P

Hardware Remote RX 2SJB

26-9-97

97_1085

97_1086

SJB R54 chage from 10R to 100R

3

22-10-9797_1096

C10

0

10P

SM

#A

SJB R64 & 169 changed. C100 added.11-11-9797_1102

4

R24

1

100R

SM

C1031N0 SM

5

6

Q_42QPAD

R42

4K7

SM

Q29BC849B

1

3 4

6

O3 TLP181 SM

R63 1K8 SM

R117

10K SM

C105

100N SM

Q_44

Q_4

5

Q_4

6

R169 2K4 SM

BSRef

Q_51

Q_5

2

Q_61 Q_62

Q_6

3

C107100P PPS SM

C108100P PPS SM


1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE




Alpha 10 Amp Power Ctrl

Circuit Diagram



Notes:

PW

R1

IN12

IN23

0V4

V-

5

O 6

FB

7

RC

8

V+

9

Z5TA7317P

R12

4

33K

SM

R18

6

120K

SM

R12

5

33K

SM

+

C50

1U0 EL

R43

47K

SM

+

C25

100U

EL

R32

100K

SM

+

C26

100U

EL

+

C27

100U

EL

R44

47K

SM

R45

47K

SM

R12

6

33K

SM

R12

7

33K

SM

+SUP

RL

Y1B

RL

Y S

PST

SPK

R

RL

Y2B

RL

Y S

PST

SPK

R

Spe

aker

s 1

Spe

aker

s 2

Speaker/Amp Protection

D23

1N40

03F

D24

1N40

03F

Q452SC2547

Q462SC2547

R20

0

2K7

1W C

F

D35

BAS16W SM

D36

BAS16W SM

R19

1K0 FU

R201K0 FU

RLY

5NC

RLY

51S

B12

T

D25

1N40

03F

D26

N

1N40

03F

R20

1N

2K7

1W C

F

Sof

t Sta

rt

Pre

-Am

p O

ut

Q472SC2547

D37

BAS16W SM

R21 1K0 FU

12345678910111213141516171819202122

SK9N

FFC22V

-SUP

+C15

10U

EL

R46

47K

SM

D38

BA

S16

W S

M

Q56BC859B

R203

2K4 SM

Q382SA1085

R20

4

10K

SM

R205

6K8 1W CF

D43

5V6

400M

W

+

C16

10U

EL

84

Z8CLM393A SM

-SUP

ABSUPAuto-Bias supplyPower-off Auto-Bias defeat

ABSUP1

RL

Y3B

RL

Y S

PST

SPK

R

RL

Y4B

RL

Y S

PST

SPK

R

PRTSUP1

12345678910111213141516171819202122

SK6

FFC22VD9

10V 400MW

D29

4V7

400M

W

R206

100K SM

R20

7

100K

SM

X1CST4.00

C34

100N

SM +

C17

10U

EL

LVProt

RVProt

R70

10K SM

D27

1N4003F

ACDet

Fault

+5V

1

2

3

SW

3A2P

CO

4

5

6

SW

3B2P

CO

1

2

3

SW

4A2P

CO

4

5

6

SW

4B2P

CO

1

2

3

SW

5A2P

CO

4

5

6

SW

5B2P

CO

SP 1 SP 2 STANDBY

Powerup

Fault

+PRE

-PRERminRemOut

REMI1REMO1

Fault

SP2MuteNSP1MuteN

PreMuteN

Prot

SP2MuteNSP1MuteNProt

PREMTN1

SP3_PWR

SP1PROT1

FAULT1

+8V

SCK1SDA1REQ1STBYLED1STBYLED

REQSDASCK

VFault

VFault

SP2

VFAULT1

SP3_PWRTHERMX1ThermX_RST

Opt

ion

PC

B

Dis

play

PC

B

+5V

Rmin

Remote PCB

PWR Amp Control

Thermal Protection

Mains/VI Fault detection

R21

8P

220R

SM

Q58RBC859B

R225R

1K0 SMREMKILL1

ATE IR RX Disable pad

User IR RX Disable Link

RLY

6B

RLY

SP

DT

24V

123

LK10RL815CA

LED PCB1234

LK9P

L836CA

1234

LK9X

L836CA

R G

LED1PLED RED/GRN

STBY/POWER

!

LED PCB

!


!

!

C3

100N

SM

SP

1SW

1

SP2SW1

STBYSW1

Designators ending in...N - For integrated amp only,P - For power amp only,R - For power amp with remote only,S - For power amp with no remote only,X - Other end of wire link.

PB51

PB42

PA33

PA24

PA15

PA06

PB37

PB28

PB19

PB010

VSS11

(TMR)/INT12

PC013

PC114 PC2 15PC3 16PC4 17PC5 18RES 19VDD 20OSC1 21OSC2 22PA7 23PA6 24PA5 25PA4 26PB7 27PB6 28Z9

HT

48R

30 2

8-D

IP-B

-0

R23

5

100K

SM

VREF1

Vt22

Vt13

GND4 Vtemp 5OUT2 6OUT1 7VCC 8Z11

LM56CIM

VREF1

Vt22

Vt13

GND4 Vtemp 5OUT2 6OUT1 7VCC 8Z10

LM56CIM

R33

12K SM

R34

11K SM

R18922K SM

R19122K SM

+5V +5V

R65

220R SMPowerup

Powerup

Cutout

RFProtTherm

ProtStat

RemMute

R234 10K SMR233 10K SM

FAN

Q_1 Q_15

THTESTRATE_PAD

THTESTLATE_PAD

Q58BC859B

R11

6

10K

SM

+5V

Q59BC849B

Q_9

Q_28

Q_31

Q_32

+UREG

R14

7

470R

SM

R17

3

470R

SM

C81

22P

SM

C82

22P

SM

R10

0

4K7

SM

R14

2

4K7

SM

D20

BA

S16

W S

M

D28

BA

S16

W S

M

D30

BA

S16

W S

M

D40

BA

S16

W S

M

Lout Rout

Rout

Lout

RF Protection

R98

27K SM

R17

5

4K7

SM

D48

4V7

400M

W

+SUP

Pwrok

Power Supply Detection

A0

1A

12

A2

3

VSS4 SD

A5

SC

L6

WP

7

VDD 8

Z1224C02 SM

+5V

R190

1M0 SM

R19

2

470K

SM

+

C11

1U0

EL Q34

BC849B

Q_1

4

Q_2

7

Q_33

C84100N SM

R21

4

4K7

SM

R21

5

4K7

SM

RESET

R21

8

120K

SM

Fit Jumper to PL1 for test power-up from external d.c. supply

-SUP

R219

10K SM

Send

Break

Demod

Raw

REMOTEL829CT5_6.SCH

5

SJB

Hardware Remote RX

n.b. R33 & R34 are supposed to be different!

No Change

2SJB

26-9-97

22-9-9797_1085

97_1086

SJB No Change

3

22-10-9797_1096

SJB No Change11-11-9797_1102

4

6

Q_5

3

Q_5

4

Q_64

R31

27K

SM

R18

5

27K

SM

Pwrok

12

PL1

2WVERTJUMPER


1 2 3 4

A

B

C

D

4321

D

C

B

A

ISSUE

DRAWING NO.

23425

DRAWING TITLE

Drawn by:DATE


J:\PROJECTS\A10amp\L829pb_Main_PCB\Circuits_&_PCB\wip\L829CT5_6.SCH


Alpha 10 Amp Remote Bus

Circuit Diagram



Notes:

Near to PCB

SK10AJACK3.5X2

Far from PCB

SK10B

JACK3.5X2

R21

0

1K5

SM

R211

4K7 SM

Remote In

Remote Out

R21

2

1K5

SM

Q57BC859B

Remote Buffer

REMJK1

REMJKO1

REMJK2

Q_2

+UREG

R221

470R 1W CF

Q61BC849B

R227

10R FU

+ C83100U EL

!

R80

10K

SM

Q31BC849B

R83

100R

SM

+5V

R28

10K SM

R19

8

4K7

SM

Q37BC849B

Q62 BC849B

R21

347

R S

M

R209

4K7 SM

+5V

Send

Break

R220

100K SM

L3 27M

H

C91

680P

PP

C92

10N

SM

R23

8

1K8

SM

R23

7

1K5

SM

R23

9

1K8

SM

R22

3

10K

SM

3

21

Z13A

LM393A SM

R22

5

10K

SM

R22

2

100K

SM

+5V

5

67

Z13B

LM393A SM

R226

10K SM

R23

6

10K

SM

+5V

Demod

Carrier Demodulator

C93

1N0

SM

84

Z13CLM393A SM

C97100N SM

+5V

Carrier Filter

Demod

Raw RemRaw

Q_34

Q_35 Q_36

Q_37

Q_38

C98

220P SM

Q_39

Q_40

SJB

Hardware Remote RX

No Change

2SJB

26-9-97

22-9-9797_1085

97_1086

SJB R210, R198, R212 change

3

22-10-9797_1096

SJB No Change11-11-9797_1102

4

5

6

Q_65

1

34

6O1

TLP181 SM

Q_66

Q_67

Q_68


1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUEDRAWING NO.

23425DRAWING TITLE

DRAWN BY CHK BY DATEFilename ECO No. DESCRIPTION OF CHANGEJ:\PROJECTS\A10amp\CIRCS\display\L831ct_1.sch

A & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PB 1 1Sheet of

ALPHA 10 AMP DISPLAY

Circuit Diagram

L831CT 1

2-Oct-1998

REQSDASCL

STBYLED

+8VVin

I

GN

DG

VoutO

Z17805

+5V

C1100N CD

R1

3R3R FU

+8V

GN

D1

VC

C2

NC

3

RS

4

R/W

(W

R)

5

E (

RD

)6

DB

07

DB

18

DB

29

DB

310

DB

411

DB

512

DB

613

DB

714

Itron VFD Module

M1ITRON_VFDM C

3

B2

A1

SK3ALPS_ENCODER

NEAR Z1, Z2

FOLD Z1 FLAT TO BOARD

PCB SILK SCREEN).

+8V+5V

GND

+5V

C5

100N CD

TAPE2_0TAPE2_1TAPE2_2

SOURCE_0SOURCE_1SOURCE_2


CLOCK

LOAD

DATA

VFD_D0VFD_D1VFD_D2VFD_D3

VFD_RSVFD_E

X1CST4.00

SCL SDA

R1110K MF

R1210K MF

PHASE_A

PHASE_B

+5V

PHASE_BPHASE_A

+5V

TO PREAMPTO POWER AMP

3

2

1

+5V

O/P

GND Case RX1SBX1610-52

C8100N CD

LED1

LED GREEN

LED2

LED GREEN

LED3

LED GREEN

LED4

LED GREEN

LED5

LED GREEN

LED6

LED GREEN

LED7

LED GREEN

SW1TACTSW2

SW2TACTSW2

SW3TACTSW2

SW4TACTSW2

SW5TACTSW2

SW6TACTSW2

SW7TACTSW2

SW8TACTSW2

SW9TACTSW2

SW10TACTSW2

SW11TACTSW2

D1

1N4148

D2

1N4148

D3

1N4148

D4

1N4148

R2

150R MF

R3

150R MF

R4

150R MF

R5

150R MF

R6

150R MF

R7

150R MF

R8

150R MF

ROW2

GND

GND

GND

GND

GND

GND

GND

D5

1N4148

D6

1N4148

D7

1N4148

D8

1N4148

D9

1N4148

D10

1N4148

D11

1N4148

ROW1

COL7

COL6

COL5

COL4

COL3

COL2

COL1

ROUT

ROW1ROW2

R14330R MF

R

G

LED100

LED RED/GRN

R13150R MF

STBYLED

R154K7 MF

R164K7 MF

ROW1 ROW2

RINROUT

1 2

LK110MM LINK

CUT LK1 TO DISABLE IR RECEIVER

Q1BC557B

R10

4K7 MF

RIN

123LK3

L815CA

123

LK2

L815CA

** SOCKETED **

+5V

R1710K MF

SCL

SDA

REQ

STBYLED

LOAD

DATA

CLOCK

SCL

SDA

RIN

ROUT

REQ

STBYLED

LOAD

DATA

CLOCK

TAPE1_0

TAPE1_1

TAPE1_2

TAPE2_0

TAPE2_1

TAPE2_2

SOURCE_0

SOURCE_1

SOURCE_2

TAPE1_0

TAPE1_1

TAPE1_2

TAPE2_0

TAPE2_1

TAPE2_2

SOURCE_0

SOURCE_1

SOURCE_2

MCLR1

RA02

RA13

RA24

RA35

RA4/T0CKI6

RA5/SS7

RE0/RD8

RE1/WR9

RE2/CS10

VDD11

VSS12

OSC1/CLKIN13

OSC2/CLKOUT14

RC0/T1OSI/T1CKI15

RC1/T1OSO16

RC2/CCP117

RC3/SCK/SCL18

RD0/PSP019

RD1/PSP120 RD2/PSP2 21RD3/PSP3 22RC4/SDI/SDA 23RC5/SDO 24RC6 25RC7 26RD4/PSP4 27RD5/PSP5 28RD6/PSP6 29RD7/PSP7

30VSS 31VDD 32RB0/INT 33RB1 34RB235RB3 36RB4 37RB5 38RB6 39RB740

Z2

PIC16C65

CLOCK

DATA

LOAD



SOURCE_0SOURCE_1SOURCE_2

COL7COL6COL5COL4

COL3COL2

COL1

LK1001

LINK10NPLK1002

LINK10NPLK1003

LINK10NPLK1004

LINK10NPLK1005

LINK10NPLK1006

LINK10NP

LK1007

LINK10NPLK1008

LINK10NPLK1009

LINK10NPLK1010

LINK10NP

C4100N CD

VFD_D0VFD_D1

VFD_D2VFD_D3

VFD_E

VFD_RS

LK1012

LINK10NP

LK1013

LINK10NP

LK1015

LINK10NPLK1016

LINK10NPLK1017

LINK10NPLK1018

LINK10NP

LK1019

LINK10NPLK1020

LINK10NP

PCB

L831PB

L831PB

Update Box(Small)

UDB

UPDATE_SML

DetailDrilling

DD2

DRILL_DETAIL

PD1TOOLING

PD2TOOLING

PD3TOOLING

PD4TOOLING

PD5TOOLING

PD6TOOLING

PD7TOOLING

PD8TOOLING

PD9TOOLING

PD10TOOLING

PD11TOOLING

PD12TOOLING

PD13TOOLING

PD14TOOLING

PD100TOOLING

PD101TOOLING

12345678910111213141516171819202122

SK1

FFC22H

12345678910111213141516171819202122

SK2

FFC22H

98765432

1

RP1100K X 8 COM

+5V

COL7COL6COL5COL4

COL3COL2

R9

4K7 MF

R20100K MF

REQ

R_IN

R_OUT

PHIL 15/5/97

R18

100R MF

R19

100R MF

R21

100R MF

+C2

470U EL 25V

C3100N CD

PWRLEDPWRLED

LK1011

LINK10NP

LK1014

LINK10NPLK1021

LINK10NP

+ C6220U EL

R22100K MF

Q2ZVNL120

RST

RST

LK1022

LINK10NP

BARCODE LABEL

EL1

BARCODE_A10_DISP


DD

DD_ISSUESML

P1

THRU_PIN

P2

THRU_PIN

P3

THRU_PIN

P4

THRU_PINP5

THRU_PIN

P6

THRU_PIN

P7

THRU_PIN

P8

THRU_PIN

P9

THRU_PIN

P10

THRU_PIN

P11

THRU_PIN

P12

THRU_PIN

P13

THRU_PIN

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

ISSUEDRAWING NO.

23425DRAWING TITLE

DRAWN BY CHK BY DATEFilename ECO No. DESCRIPTION OF CHANGEJ:\PROJECTS\A10amp\CIRCS\PREAMP\L832ct_1.sch

A & R Cambridge Ltd.Pembroke AvenueDenny Industrial CentreWaterbeachCambridge CB5 9PB 1 1Sheet of

A10 Amp Pre-Amp PCB

Circuit Diagram

L832CT 1

2-Oct-1998

12345678

LK1L823CA

EM

C1

N

F

SK1A

PHONO4G

N

F

SK1B

PHONO4G

EM

C

1

N

F

SK2A

PHONO4G

N

F

SK2B

PHONO4G

EM

C

1

N

F

SK3A

PHONO4G

N

F

SK3B

PHONO4G

EM

C

1

N

F

SK4A

PHONO4G

N

F

SK4B

PHONO4G

EM

C

1

SK5

PHONO2G

12345678

LK2

L832CA

+15V

-15V

Pre-Amp Audio OutputPASW1

NASW1

PAN1

NAN1

3

21

Z3A

OPA2134PA SM5

67

Z3B

OPA2134PA SM

84

Z3C

OP

A21

34P

A S

M

3

21

Z4A

OPA2134PA SM

5

67

Z4BOPA2134PA SM

84

Z4C

OP

A21

34P

A S

M

AUX1R

+15V

-15V

AUX1L

L

R

Phono PCB

12345678LK1X

L823CA

PH15PPHGND1PHORPHGND2PHGND3PHOLPHGND4PH15N

R17

1K0 SM

R18

1K0 SM

R44

22K SMR45

22K SM

CDR

CDL R19

1K0 SM

R20

1K0 SM

R46

22K SMR47

22K SM

TUNERR

TUNERL R21

1K0 SM

R22

1K0 SM

R48

22K SMR49

22K SM

AVR

AVL R23

1K0 SM

R24

1K0 SM

R50

22K SMR51

22K SM

AUX2R

AUX2L R25

1K0 SM

R26

1K0 SM

R52

22K SMR53

22K SM

TAPE1IR

TAPE1IL R27

1K0 SM

R28

1K0 SM

R54

22K SMR55

22K SM

TAPE2IR

TAPE2IL R29

1K0 SM

R30

1K0 SM

R56

22K SMR57

22K SM

X013

X114

X215

X312

X41

X55

X62

X74

INH6

A11

B10

C9

VEE7

X 3

GND8

VDD 16

Z6MAX4051 SM

X013

X114

X215

X312

X41

X55

X62

X74

INH6

A11

B10

C9

VEE7

X3

GND8

VDD 16Z7

MAX4051 SM

Aux1L

Aux1R

CDL

CDR

TunerL

TunerR

AVL

AVR

Aux2L

Aux2R

Tape1IL

Tape1IR

Tape2IL

Tape2IR

Aux1L

Aux1R

X013

X114

X215

X312

X41

X55

X62

X74

INH6

A11

B10

C9

VEE7

X3

GND8

VDD 16Z8

MAX4051 SM

X013

X114

X215

X312

X41

X55

X62

X74

INH6

A11

B10

C9

VEE7

X 3

GND8

VDD 16Z9

MAX4051 SM

X013

X114

X215

X312

X41

X55

X62

X74

INH6

A11

B10

C9

VEE7

X 3

GND8

VDD 16Z10

MAX4051 SM

X013

X114

X215

X312

X41

X55

X62

X74

INH6

A11

B10

C9

VEE7

X3

GND8

VDD 16Z11

MAX4051 SM

CDLTunerLAVLAux2L

Aux1L

Tape2ILPlugL

CDRTunerRAVRAux2R

Aux1R

Tape2IRPlugR

CDLTunerLAVLAux2L

Aux1L

Tape1IL

PlugL

CDRTunerRAVRAux2R

Aux1R

Tape1IR

PlugR

CDLTunerLAVLAux2L

Aux1L

Tape1ILTape2ILPlugL

CDRTunerRAVRAux2R

Aux1R

Tape1IRTape2IRPlugR

3

21

Z12A

TL072 SM

5

67

Z12B

TL072 SM

84

Z12CTL072 SM

3

21

Z13A

TL072 SM

5

67

Z13B

TL072 SM

84

Z13CTL072 SM

R38

100K

SM

R39

100K

SM

R40

100K

SM

R41

100K

SM

R58

47R SM

R59

47R SM

R60

47R SM

R61

47R SM

Null_R

Null_L

GND AC1

OUT12

GND13

IN14

GND AC5

GND AC6

VEE27

LOGIC GND8

CLOCK9

LOAD/SHIFT10 DATA IN 11DATA OUT 12VDD1 13GND AC 14VDD2 15GND AC 16OUT2 17VEE1 18GND2 19IN2 20

Z14

LM1972

-7V2

-7V2

-7V2

-7V2 -7V2

-7V2+6V8

+6V8

+6V8

+6V8

+6V8

+6V8

+6V8

-7V2

-7V2

R64

1K5

SM

1%

R65

1K5

SM

1%

R66

6K8 SM1%

R67

6K8 SM1%

R62

47R SM

R63

47R SM

+15V +15V

-15V -15V

+15V

-15V

+15V

-15V

TAPE1OL

TAPE1OR

TAPE2OL

TAPE2OR

123456789

10111213141516171819202122

SK7

FFC22V

R68 100K SMR69 100K SM R70 100K SMR71 100K SM R72 100K SMR73 100K SM R74 100K SMR75 100K SM R76 100K SM

TAPE1_0TAPE1_1TAPE1_2TAPE2_0TAPE2_1TAPE2_2SOURCE_0SOURCE_1SOURCE_2

Tape1_0Tape1_1Tape1_2




Source_0Source_1Source_2


SETOFF

R14

10K

SM




R31

1K0 SM

DGND

R77

100R SMLGND

R32

1K0 SM

R33

1K0 SM

R34

1K0 SMClock

Load

Data

CLOCK

LOAD

DATA

GND

Q_1QPAD

Q_2QPAD

Q_3QPAD

Q_4QPAD

Q_9QPADQ_10QPADQ_11QPAD



C33

1N0

SM

C34

1N0

SM

C35

1N0

SM

C36

1N0

SM

C37

1N0

SM

C38

1N0 SM

Q_18

QPAD

Q_19

QPAD

Q_20

QPAD

Q_21

QPAD

LOUT

ROUT

1234567891011121314151617181920212223242526272829303132

SK8FFC32V

Aux1L

Aux1R

CDL

CDR

AVL

AVR

Aux2L

Aux2R

Tape1IL

Tape1IR

Tape2IL

Tape2IR

TunerL

TunerR

PlugL

PlugR

To

Plu

g-i

n P

CB

PLUGINL

PLUGINR

R80

22K

SM

R81

22K

SM

TL1TOOLING

TL2TOOLING

S.J.B.

FD_1

FIDUCIAL

FD_2

FIDUCIAL

BARCODE LABEL

Photo Strip

+6V8

-7V2

C10

680P

PP

C11

680P

PP

DetailDrilling

TL3TOOLING

TL4TOOLING

Update Box

PCBL832PB

C1

10U NP

C3

10U NP

+

C31

22U EL

+C32

22U EL

+6V8

-7V2

D16V8 400MW

D26V8 400MW

+15V

R1

1K0 SM

R2

1K0 SM

R356R SM

R456R SM

C81N0 SM

C91N0 SM

C1547P SM

C16

47P SM

C1747P SM

C18

47P SM

C1947P SM

C2047P SM

C2147P SM

C2247P SM

C2347P SM

C2447P SM

C2547P SM

C26

47P SM

C1347P SM

C14

47P SM

1 23 45 67 89 10

11 1213 1415 16

PL6

DIL16 VPLG

TL5TOOLING_BIG

TL6TOOLING_BIG

R51K8 SM


DD1

DD_ISSUE

R6100K SM

R7100K SM

+ C222U EL

+C4

22U EL

Documents

ALPHA 10/10P SERVICE MANUAL - Acoustic Psychos · ALPHA 10/10P SERVICE MANUAL Figure 3 Micro Block Diagram 3 through the amplifier due to C72 and 74 d.c. blocking capacitors and on