PianoDisc Player System

SilentDrive Troubleshooting Guide

Version 1.0 March 20, 1997

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PianoDisc Player System

ilent Drive Troubleshootinc InformationVersion1.0 March 20. 1997

A properly installed PianoDisc system usually operates with no problems. However.onrare occasions anomalies occur, seemingly at random and without warning. At these timesa certified Piano Disc installer may need to track down the source of the problem andrestore the Piano Disc system to normal operation.

These procedures outlined here are in order from the easiest and/or most likelycause ofthe problem to the least likelyor most difficultto check. In most cases. followingthese pro-cedures willcorrect the problems most often encountered.

A t~hnician should have a VoltI Ohmmeter. since use ofthis tool is indispensable in prop-er troUbleshootingof the PianoDiscsystem.

Important Note: The Silent Drivesystemwas designedto be used witheithera 35 VDepower supply or 40 VDe power supply. In this manual. 40 VDe has been used for thegeneric case. Most systems willhave the 40 VDe supply.whichis not only much smallerthan the previous 35 Voltmodel. but includes a heat sink. The heat sink is a multiplefin-like structure on one side of the power supply.normallyfacing away from the soundboard.In any case, please adjust to either 35 VDCor 40 VDC.depending on which supply isused.

CONTENTS:

Common Problem #1 No PowerToThe CompleteSystemCommon Problem #2 ControlBoxHas No PowerCommon Problem 13 ControlBox"Wones8ButThe Piano Won'tPlayCommon Problem #4 VolumeIsTooLoudEvenAtThe LowestSettingCommon Problem #5 VolumeIsTooSoft Even AtThe HighestSettingCommon Problem #6 BlubberingHammersCommon Problem #7 Record Strip Is NotWorkingCommon Problem 18 8Request ByteFailure8Common Problem 19 AllLEes Are Illuminated.OnThe CPU BoardCommon Problem #10 Three LEOsAre Flashing OnAndOffContinuouslyCommon Problem #'1 One Section OfThe Piano Does NotPlayCommon Problem 112 Pedal(s) Co NotWorkChecksums: Checksums for Expressionand CPU UpdatesTest Equipment SuggestionsFigure 1 ( KeyDriver\AlireHarness and Power Supply)COTroubleshooting a &Awithdiagrams

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Common Problem 11 No Power To The Complete System

Procedure:1. Check to see if the power cord is pluggedinto the wall.2. Check tor power from the wall plug (sometimesa wafl plug is controlledby a

switch. or there may be no power to that particularwall socket).3. Check to see if the power supply switchis on.4. Check the outside fuses on the powersupply(there should be one spare fuse).S. Unplug the AC cord at the power supply and check it with the volt meter for 115

Volts AC or 220 Volts AC.

6. Check the DC outlet on the power supply when the power supply is switchedON. It should read +35 Volts DC or +40 VoltsDC.

7. Check for +10 Volts DC output between pins 2 & 6 of the 6 Pin DIN connec+.or(see diagramfor pin assignments.Figure'1)

8. Double check all the plug connectionson the power supply and CPU interface.looking for bad connections. Insulationon some of the 6 pin din cables is tcoclose at the connec+.cr.Shaving 1/8 inch of insulation off can make a better con-nection in some cases.

If at this point there is still no power to the system. it is likely that the power supply isfaulty and -needs to be replaced. Contact PianoDiscfor further instructions.

Common Problem #2 Control Sox Has No Power

Procedure:1. Checkto seeif the powersupplyswitch ison.2. Check to see if the 6 pin MIDIcable is pluggedsecurely into the control box and

the CPU interface at the piano. Check length of insulation as described previ-ously in Common Problem,,- above.

3. Replaceor checkthe continuityof the 10foot-6 pin cable from the CPU inter-face to the control box.

4. Replace or check the continuityof the 3 foot a pin cable from the power supply tothe CPU interface. (Verticalpianos use a 5 foot cable)

S. Check the power supply forvoltageoutput Tum the power off and remove the 6pin cable from the power supply. Tum the power supply back on andcheckforpower between the No. Spin (+) (10 VOC) and the No.2 pin (-) (GND) at the 6pin port (see Figure #1)

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Common Problem #3 Control Sox "Works" But The Piano Won't Play

Procedure:1. Version 2.4 of the PDS128 Plus and versionJ for the PDS128 have a default set.

tings option which can be pressed to returnvolume. balance and other settingstotheir default values. Sometimes it helpsto initializeeverything by accessing "DFLron the second mode page on the controlbox.

2. Check for presence of a MIDIsignalat the CPUinterface (there should be a flashingyellow light) when a diskette is playing. If the light is not flashing, check the portconfiguration in the control box. First.with a diskette in the drive, access the "MIDI"menu. Select "OUT'. and then make sure the word "ON" appears atter the word"F'IANO"(when configured for normaluse. the three part setting should be: PIANOON, SYNTH ON. and OUT OFF.whichis MIDIOUT). Software versions H (for theF'DS128)or 2.3 (for the PDS128 Plus)have a status byte on the LCD dis~lay. If"Piano. is displayed in the lower left bottomcomer then the PIANO is OFF. Laterversions of the software willalso includethis feature.

3. Replace or check the continuityof the 6 pin cable from the control box to the CFUinterface. If the cable is okay. your centrol box is most likely defec+jveand ycushould tryanotherone.

4. If the yellow light is flashing while playinga diskette. press the test bl.'ttOnon theCPU interface. If the solenoidsplay.thistellsyouU1at Icgic (10 VDC)and40 VDCare present and that the power supplyis okay. This also tells youthat the problemis with the MIDI signal.

5. If the solenoids do not play when the test button is pressed, press the reset buttonon the CF'U and try the test button again.

6. If the solenoids do not play. check the power supply for 10 VDC logic and 40 VDC.(See power supply bench check illustration, Fig. 1). NOTE: There are four fuses onthe power supply, one is a spare. All fuses are on the outside and are accessiblewith a straight screwdriver.

7. If the fuses are okay. (always check fuses for continuity with a volt meter) and logic(10 VDC) or 40 VDC are missing, replace the power supply.

8. If the power supply checks out okay,and the solenoids do not play when the testbutton is pressed. check for 40 VCC at the flat ribbon cable plugged into key driver.~ards. (Twoouter wires are 40 VDCandtwo middle wires are negative). If the 40VDC is missing, unplug the nbbon cablefrom the CF'U and re-checkvoltage at theCPUplug. If the voltage is missing,replacethe CPU board. If 40 VCC is present atthe CPU,checkthe ribboncableforcontinuity. .

9. If the 40 VDC is present at the driver boards,and solenoids do not play by pressingthe test button on the CPU, check the 3' -6 Pin cable connecting the CPU to thepower supply. If the cable checks out okay,the problem could be a defective driverboard. NOTE:~ic power(10VCC) andMIDIinformationrunthrougheachdriverboard.so there is a possibilitythat the key driver board is not allowing voltage orinformation to pass through the nextdriverboard.

10. The next step wouldbe a processofcheckingone driver board at a time pluggingthem directly into the CPU.

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Common Problem #4 Volume IsTooLoudEvenAtThe Lowest Setting

Procedure:1. Check the minimumvelocitysettings while in the servic~ mode. Decrease the

settings propeny. adjust volume.and then try playingthe piano again. See therelease notes on adjusting the leam settings forinformationon this procedure.

2. Check to see ifthere is 40 voltsat the powersupply (see Figure 1). It is possiblethat the voltage regulator has failed. Ifit has. you willget a reading of 50 volts.At the side of the power supply (heat sink side) there is a voltage regulatoradjusting screw. With a volt meter. try adjustingthe voltage to 40 volts. Ifthevoltmeter shows no change. the voltageregulatoris most likelydefective.andyou shouldcontactPianoDiscforfurtherassi~~ce.

3. Change actionweightin the servicemodeinorderto decreasethe playbackvol-ume. Makecertainto alsosendthe otherparameters(hold force. pedal strike.and pedalhold)because these valueswilldifferaccording to action weight

Additional suggestions:A. Sy using a moist cloth and iron. steaming the hammers can achieve a rapidsoft-

ening. Caution should be taken withpianosof highvalue and instrumentsusedfor manual play.

S.. Soften the hammers with a mixture of 70% denatured alcohol and 30% water.C. On hard floor surfaces. use felt on the bottom of the caster cups to cut the trans-

missionof soundvibrationsthroughthe piano legs to the floor.

Common Problem 15 Volume Is Too Soft Even At The Highest Setting

Procedure:1. Check the .Balance. setting by pressing the MODE button and accessing the

.Balance8feature. Be sure that the bar displayline is in the center.2. Checkthe powersupply 40 volts CC. Try adjustingthe voltage up to 40 volts.

(Note: Only adjust the heat sink type supply up to 40 volts DC.) If there is noresponse. then the power supply is defectiveandmust be replaced.

3. Change the action type in the service mode to appropriate type. If the typeselected was .'ight"'. consider using .medium8to increase the overall volume.Follow instnJdions for the setup of this procedure. (These instructions are the.ReleaseNotesj

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Common Problem #6 Blubbering.Hammers

Procedure:-Blubbering" is the term used to describe the quick double stMkes on some notes by thepfayback mechanism. This is usuafly caused by improper adjuStment of the solenoidrail.1. Remove the key slip fromthe piano and check forfuftdip of key movement using

Learn Mode or the AftNotes Test song or the CPU test button. This is a quickway to check for railheight.Check rail height adjustment.Check the travel of a -blubbering"keyat the pointof solenoid contact. The traveldistance of the solenoid should not be more than , 18inch of key travel. This isparticulatiyimportanton uprightpianos. .

Se sure that the piano' is propeny regulated. The checking of hammers is opti-mum for most pianos at '12 inch from the strings and no more.Expression table setting may need to be changed. (See Release Notes).

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Common Problem #7 Record Strip Is Not Wor1<ir.g

Procedure:

1. Make sure the system is operating property by playing a diskette.2. Check the MIDI In port configuration in the control box. Do. this by pressing

MODE and other necessary keys to access the MIDIIn feature as instructed inthe useris manuaf. Seiect input from piano so that the screen displays: llnputfrom PIANO 1M

3. Remove necessary piano hardware (thefaflboard for Grands) and check the rib-bon cable connection on the rightside.

4. Withthe system turned on, playa few keys and observe the record light (REOLED,labeled -RECj. If the lightblinkswhen the keys are depressed. then therecord stJip is working. If the lightdoes not blink.the record strip or board isdefective. Contact PianoDisc.

5. Ifthe lightdoes respond. performthe nexttest. Atthe MIDIinterface on the sole-noid rail cover. plug in a 5 pin MIDIcable from CPU -MIDIIN"to record boardMIDIOUT (this is caned looping). Play a few notes at a time. The yellowMIDIlight on the MIDIinterface should blink. Also the keys should remain. down .because of the looping of information. Remove cable when finished. If thisworked. then the centro, box piano in port is faulty. Record data to MIDIIn onthe PDS12S to verify. Make certain that the MIDIIN setting is set to eitherFROM PIANO or MIDIIN ports for each case.

Caution: WhDeperforming this test, be sure that no more than a notes are held down atany time. Too many notes played at once could blow a fuse in the power supply.

...~ Common Problem #8 -Request Byte Failure-

Procedure:8RequestByte Failure" is a messagewhich in somefew cases "Jay appear on the con-trol box LCDdisplay. This messageis displayedwhen a generic error occurs during setup of the Silent Drive system. An error is generatedwhen the communication betweenthe CPU interface and the control box is not reliableor in a contused state. If the sys-tem was in the process of a code or expressionupdate, a checksum will be displayedwhen the system is working.1. Press the reset button on the CPU interface and try whatever you were doing

again..2. If -Request Byte Failure- appears.checkthe 6 pin cable from the control box to

the CPU interface. This needs to be a solid connection. Try another cable. ifavailable. .

3. Checkthe power supply 6 pin cable to the interface. This must be a short 3 fcotcable (grand) or 5 foot cable (vertical). Replaceor adjust

4. If nothing is working still. replaceCPU boardwithanother.

Common Problem #9 All LEOs Are Illuminated On The CPU Soard

-P:-ocedure:

When all LEDs on the CPU boardare lit. the CPU interfaceis malfunctioning or an errorhas.occurredon a update.1. If you were doing an update.press reset on the CPU board and try again. (A

8Requestbyte failure8may occur once. but repeat the update a second time bypressing reset and try again. Make sure a checksumvalue is shown on the dis-play at the end of the update.)

2. Switchthe CPUinterfacewithanotherone. if available.

Common Problem 110 Three LEOsAre Flashing OnAnd Off Continuously

Procedure:When three LEDs are continuouslyflashingthe boardhas been damaged or is malfunc-tioning.1. ReplaceCPU interlace board.

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Common ?robiem #11 One Section OfThe ?iano Does Net ?!ay

Proceduie:,. Check the te!ephone-STyle c::mnectcrs and make sure they are plugged in an the

way on each board. Makesure the CPUinterface is plugged in also.Check the 40 VDC wire harness which must be connected at each key driverboard.

Swap any bOaid with another to determine it there is improvement. If one boardseems to be not allowingnotes to be played beyond it. place this board in thetreble section.Test key driver boaids one at a time by connectingone to the CPU interface.Press Thetest button on the CPU interfaceto determinewhich board is faulty.

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C"mmcn Problem #12 ?edal(s} Do Not'.Nork

Procedure:,. Make sure that t,e Fsdai connecter.is pluggedintothe correctRCAtyJ:ejack for

the proper pedal. At this time only the sustainpedal is implemented. In the nearfuture the soft pedai will be implemented. Press the test button and wait untilthepianoplays aHthe keys. At the end it willfirebothpedalsolenoids.Plug the RCA connector into the other Jack and press the test button it notaiready doing so and wait until all the keys have played to see it the pedai fireson the "wrong-f connec+.or. If so. the pedal wire harness was connected back-wards. Unplug and swap the wire at the driver b-oards.Using the test disk. piay the su~~n pedaitest The LED on the CPU interiacewill indicate when a pedai is piaying. If the pedal is not properiy workingwhenthis occurs. check the pedal hoid and stMke forces in the service mode.Determine that the connections have been made prepeny or !hat t"e pedai will"". '1"'-' th · st -utt..re ::orrec:.yw;u, e le u en.A pedal fuse or soienoid FEr may be blown. Try S'Napping~e driver beard wit'ianotherdriverboardwhichdoes not require the use of the pedaLDisconnect t"e pedai wires from the CPU interface and check the resistance ofme pedal solenoid. Itshould be 5.5 +/- 0.5 Ohms. Aisc check the leads to !hecasing of the pedal soienoid. The soienoid may have been shorted to ground.?ertOmi : :ornir:uitytest with a multimeter.

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Chedcsums

Expression ChecksumsAs of the print date of this guide. the checksums for the Expression Tables for theExpression Table Update version 1.0. RevisionAare:

GrandLongShort

35Volt2484F1B735FF

4OVoltSE9832A770D3

The SilentDrive CPU Update Checksums are:RevA S87ERev 8 NIARev C 5650Rev D A726f

Test Equipment Suggestions

It is highly recommended, as a technician,that you are equipped with the proper elec-tronic measurement and test equipment. Most certainly a multimeter. spare partsincluding spare cables. spare key driver boards. and other common hardware. Wehave a spare parts kit available whichcan save a great deal of time and unnecessarytravel time by bringingthese items when servicingPianoDiscproducts and equipment

Inthe futurewe willmake available additionaltest fixturesto expedite testing the silentdrive system.

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1. 40 Volt DC.2. Ground3. No Conneaicn4. GroundS. 40 Volt Cc.

To check for 40 volt power to beard.place positive lead on pin 1 or 5 andplace negative lead CI1pin Z or 4.

p End View

F4 S:USI!1.1-Soare

Spare *,r~' or FZDonot use in F3.

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~ =USI! .t~.250VExternal snort or overload on10 vclt cLC.line Of'internal

short or overload en fan circuitry.

F2 ~USI! 1 ~., SOV

External shcrt or cvertcad CI1High D.C.line.

F1 Fuse; A.' 50VPrirmIryside of cal shcrts.memal short in power supply.A.c. input vcltage spike ftIIItipIecycling of power supply Mtchweakens F1 fuse due to tremendcusin-rush current of toroidal tnnsfanner. .

To test for 40 voltsplace test leads here.

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23=S

LowPowe-0utDUt emGNO 1GND 2

6 N.c. 3

1 .10V 4- RESERVED 5

.10V 6

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Setup for CD player with a PianoCD BoxOR

PDS128 Plus Control Box, a stereo,and non-amplified speakers

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Setupfor CDplayerwitha PianoCDBoxOR

PDS128PlusControlBox,andamplifiedspeakers

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