Upload
raven-kimberley
View
213
Download
1
Tags:
Embed Size (px)
Citation preview
HP 29C CALCULATOR DIAGNOSIS and RESTORATION
Presented by: Jim JohnsonHP Handheld Conference 2013 – Fort Collins, CO
September 21-22, 2013
RESTORATION of an HP 29C CALCULATOR
Synopsis: The HP 29C is one of the last of the Woodstock series of calculators to be developed and introduced by HP in 1977 and was produced for the next 2 years until 1979. This was the top of the line Woodstock series calculator (code name “Bonnie”) along with its twin, the HP 19C which had a printer incorporated as part of the calculator. This presentation will follow my diagnosis of the electrical characteristics of the HP 29C and its functionality. We’ll take a look at the schematic, including the power supply section. Then we’ll dive into the output waveforms of the Arithmetic, Control and Timing (ACT) chip. Finally we’ll finish with the restoration of functionality of the HP 29C and the completed unit (S/N: 1811S20315).
RESTORATION of an HP 29C CALCULATOR
Agenda• Synopsis• Calculator acquisition – brief history• Disassembly, Photos, Identification of Integrated Circuits and Power Supply• Schematics• Troubleshooting and Diagnosis• Functioning HP 29C Calculator• Contrast and Compare Past with Present• Summary and Conclusions
RESTORATION of an HP 29C CALCULATOR
*Never* attach the charger of a Woodstock series unit to the calculator without a known good rechargeable battery in place. An AC charger connected to an HP 29C with a bad battery, bad contact or without a battery in place, has a high degree of certainty that the excess voltage will destroy or damage the unit.
A WORD OF
RESTORATION of an HP 29C CALCULATOR
What this presentation is:• A discussion of my passion and interest in vintage HP
calculators from a hardware perspective• Sharing information learned/not available on the web• Troubleshooting methodology for HP Woodstock Series• Bringing a vintage, rare HP 29C back to life!• A brief contrast and compare of HP 29C versus a modern HP
calculatorWhat this presentation is not:• Not an in-depth discussion of the operation of the HP 29C• Not a critical examination of the routines or ROM firmware
used in the HP 29C• Not an exhaustive study of the mathematical concepts used to
create “Bonnie”.
Setting Expectations
Personal Collection: HP01, HP10bII, HP12C, HP15CLE HP17bII+, HP21, HP25, HP29C, HP30b, HP32E, HP32SII, HP34C, HP35S, HP41CX, HP42S HP45, HP67, HP97, HP200LX, WP34S
RESTORATION of an HP 29C CALCULATORAcquisition of two HP-29C calculators
SN: 1811S20315May 7, 2012 - eBay
SN: 1904S21718June 28, 2012 - eBay
HP 29C’s sell on eBay for range from $81 - $372. Avg. sell price $202Listing prices range $0.99 - $495. Note: According to the Museum of HP Calculators, the HP 29C sold new in 1977 for $195.00 (USD).
RESTORATION of an HP 29C CALCULATORDisassembly, Photos, Identification of Integrated Circuits and Power Supply
To open remove the top 2Screws under the footpads
RESTORATION of an HP 29C CALCULATORDisassembly, Photos, Identification of Integrated Circuits and Power Supply
13
2
RESTORATION of an HP 29C CALCULATORDisassembly, Photos, Identification of Integrated Circuits and Power SupplyArithmetic Control and Timing (ACT) IC, RAM, ROM, POR/Battery Low Comparator
Arithmetic Control and Timing (ACT) IC ROM IC’s
CMOS Static RAM
I.C.’s
POR (Power on Reset),Battery Low Comparator IC
RAM/ROM IC
SN: 1811S203151
RESTORATION of an HP 29C CALCULATORDisassembly, Photos, Identification of Integrated Circuits and Power Supply
3.3uF, 10vNPN Transistor
NPN Transistor Tank oscillator circuit330pf cap. & 15uH coil
68Ω10KΩ 10uF, 16v
6.8uF, 10v
2.2uF, 6v
15uF, 10v
2.2KΩ
22uF, 10v
330pf
100pf
diodediode
diode
diode diode
HP 29C Power Supply PCB(Daughter Board)
2
RESTORATION of an HP 29C CALCULATORDisassembly, Photos, Identification of Integrated Circuits and Power Supply
3
Cathode Driver ICROM/Anode Driver IC
RESTORATION of an HP 29C CALCULATOR
1820-1596ACT
1820-1382Cathode Driver
&KeypadDriver
5061-0469RAM
HP 29C CalculatorHewlett-Packard
Page 1 of 1 Created: 2013 August 12
1990-055912-digit LED
Display
• Based on S/N: 1811S20315 • drawn by: JAJ – 2013 August 12
1820-0431Anode
Driver /ROM
1818-0379RAM/ROM
5061-0469RAM
1234
8765
1818-0377ROM
8765
Vgg
Φ 2
Φ 1
ISA
1234
Vss
Vgg
Φ 2
Φ 1
ISA
Vss
Φ 2
Vgg
Φ 1
Sync
ISA
Data
1818-0376ROM
1234
8765
Sync
Vss
Sync
12345678
16151413121110 9
12345678
16151413121110 9
Vram
NC
NC
Φ 1
Φ 2
NC
ISA
Sync
Vram
NC
NC
Φ 1
Φ 2
NC
ISA
Sync
Vss
NC
Data
POR
NC
Data
POR
+6.7 vdc
+6.0 vdc +6.0 vdc
+6.0 vdc
+6.7 vdc
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
Vss+6.0 vdc
Vgg-12.0 vdc
RCD
SYNC
Φ 1
Φ 2
NC
POR
NC
ISA
DATA
1820-1983Power-on Reset, low
battery
1234
8765
330pf
150uHOSC
OSC
+ 2.2uf
To pin 3 on POR
A3
A4
A5
A6
A2
A7
141516174567
20191813121110 9 8 3 2 1
+6.0 vdc
+2.4 vdc
NC
NC
Vbat
Vss
2KΩ
RCD
STR
+6.0 vdcVss
NC NC
NC
POR
+2.4 vdc Vbat
+ 47uf
33Ω
o oo o o o o oo o
o oo o o o o oo o
o oo o o o o oo o
o oo o o oo o
o oo o o oo o
o oo o o oo o
o oo o o oo o
Blue (g)shift
Gold (f)shiftGTOSST GSB
STOX Y R ↓ RCL ∑+
CHSE N T E R ↑ EEX CLX
8_ 7 9
5+ 4 6
2X 1 3
.÷ 0 R/S
To pin 3 on ACT
+6.0 vdc
123456789
Segment “a”
Segment “f”
Segment “b”
Segment “c”
Vdisp
Segment “d”
Segment “h”
Segment “e”
Segment “g”
A2 A3 A4 A5 A6
B1
B4
B3
B8
B6
B5
B7
K9
K10
K11
K12
K3 and B8
K2 and B7
K1 and B5
K6 and B3
K5 and B4
K4 and B6
K8
K7 and B1
181716151413121110
Sync
Φ 1
Φ 2
STR
Vss+6.0 vdc
NC
ISA
Vgg-12.0 vdc
ab
c
d
e
fg
h
HP 29C Schematic
RESTORATION of an HP 29C CALCULATOR
1. Acquired 1st HP29C. After examining the pc board for damage, put in charged battery pack and observed 12 zeroes lighting up on display. No keypad button presses would change the display.
2. Suspected one of the IC’s was bad. Measured current of 300-400mA. Much higher current than HP25 and measured HP29C supply voltages. The supply voltages measured lower than normal.
3. Unsoldered all RAM/ROM IC’s and applied power observing only one zero lit up in display (far RH digit in display). Suspect Anode/ROM IC.
4. Acquired 2nd HP29C (s/n: 1904S21718) which had no display when powered on. Power supply voltages measured good and the supply current measured good around 200mA.
5. I swapped the Cathode Driver and Anode/ROM Driver from s/n: 1811S20315 into s/n: 1904S21718 (2nd HP29C). No display in second HP29C.
6. Used good HP25 to measure signals on ACT: oscillator, data, Isa, sync, ɸ1 and ɸ2. I measured same signals from s/n: 1811S20315 and found ɸ2 amplitude was low at 9vpp. Suspected the ACT in 1st HP29C may be damaged.
7. Installed low profile IC sockets in HP29C s/n: 1811S20315. Removed ACT from 2nd HP29C and installed into 1st HP29C.
Troubleshooting and Diagnosis
RESTORATION of an HP 29C CALCULATOR
Tank oscillator circuit
Vss = +6.0vdc
Troubleshooting and DiagnosisIs the Power Supply Functional?
Vdisp = +4.37vdc
Vram = +6.5vdc
Vgg = -12.0vdcVbatt-IN= +2.4vdc
(switched)
RESTORATION of an HP 29C CALCULATORTroubleshooting and Diagnosis
Is the ACT Functional?
Oscillator Pins 13 & 14
Ref. Pin# 1
ɸ1 and ɸ2Pins 16 & 17
Arithmetic Control & Timing IC (ACT)
RESTORATION of an HP 29C CALCULATORFunctioning HP-29C Calculator (SN: 1811S20315)
8. Installed original IC’s from s/n: 1811S20315 with ACT from 2nd HP29C and turned on power switch. Single zero lit up in LH location on display.
9. Plugged in RAM IC’s and turned on HP29C. Display showed “error”. CLX key cleared the display to “0.00” showing in LH location.
10. EUREKA! Calculator seemed to be functional!
11. Continued to test functions on HP29C and tested programmingexamples in HP29C ApplicationsBook. All functions worked perfectly!
RESTORATION of an HP 29C CALCULATOR
• 98 program steps (with fully merged keycodes) • 30 storage registers. (16 were directly or indirectly addressable and the rest were only indirectly addressable.) • 3 levels of subroutines and 10 labels• 4 level stack (X, Y, Z, T)• Indirect storage, recall, branching and subroutine calls• Execution speed ~ 3,000 instructions/sec.• Continuous memory• Rechargeable batteries
HP 29C WP 34S• 928 program steps in RAM• 107 global general purpose registers• 112 global user flags• 6014 program steps in flash memory• 30 byte alpha register • 16 local flags and 144 local registers• 6 (min) levels of subroutines• 8 level stack• 34 digit decimal accuracy• Continuous memory• CR2032 (2x) disposable batteries
Math+,-,x, ÷, 1/x, √x, x2
LOG x, 10x, LN x, ex, yx, pi%, INT, ABSTrig (SIN, COS, TAN)Modes (degrees, radians, grads)
StatisticalMean, std. deviation (2 variables)Summation of n, x, x2
Summation of n, x, x2, ySummation of n, x, x2, y, xySummation of n, x, x2, y, y2, xy
Polar/rectangular conversionDec. hrs./hrs.min.sec. conversion
Math+,-,x, ÷, 1/x, √x, x2
LOG x, 10x, LN x, ex, yx, pi%, INT, ABSTrig (SIN, COS, TAN)Hyberbolic Trig. (SINH, COSH, TANH)Modes (degrees, radians, grads, fractional)
Conversions and Constants88 conversions available50 fundamental constants
Pre-programmed FunctionsHP-42S function set (solver, integration, matrix operations, curve fitting, etc.)HP-16C function set (Logical operators, floating pt. decimal math)HP-21S probability function set (Distributions, linear regression, Chi-squared, etc.)
+Euler’s Beta and Riemann’s Zeta functions, Bernoulli and Fibonacci numbers, +Lambert’s W, the error function, and the Chebyshev, Hermite, Laguerre, and Legendre orthogonal polynomials+ many statistical distributions and their inverses: Poisson, Binomial, Geometric, Cauchy-Lorentz, Exponential, Logistic, Weibull, Lognormal, and Gaussian, + programmable sums and products, first and second derivatives, solving quadratic equations for real and complex roots, + testing for primality, + integer computing in fifteen bases from binary to hexadecimal, + extended date and time operations and a stopwatch3 based on a real-time clock, + financial operations such as mean rate of return and margin calculations
Contrast and Compare Past with Present
RESTORATION of an HP 29C CALCULATOR
Summary and Conclusions• The goal of this paper was to share HP29C information with the HHC 2013 audience as well as other HP calculator enthusiasts.• Diagnosis of the HP29C begins with examination of the overall condition of the calculator, disassembling, cleaning and using a known good power source.• Measure the four power supply voltages in the power supply section.• Once the power supply voltages are verified good, then you can move on to check the oscillator, ɸ1 and ɸ2 signals.• If integrated circuits are damaged, either from battery corrosion or from excess applied voltage, the only alternative is to find a “donor calculator”. • If ACT IC is damaged; same applies in that you’ll need to find another ACT. • Finally, the restoration of these fine pieces of history is satisfying and rewarding and keeps part of Hewlett-Packard history alive for future generations.
RESTORATION of an HP 29C CALCULATOR
Acknowledgements
1. Tony Duell (UK) – Information on MoHPC site and email exchange in 2012.2. Jacques Laporte – HP Calculator Forum (www.jacques-laporte.org/forum)
email exchange and the very excellent paper “The ‘Woodstock’ generation”.
3. Museum of HP Calculators – (http://hpmuseum.org)4. Geoff Quickfall (Canada) – Email exchange regarding HP calculators,
particularly the HP19C.5. Dave Colver (UK) – Email exchange regarding HP29C schematics.6. Randy Sloyer – (www.fixthatcalc.com) email exchange in 2012.7. Eric Smith – Email and posts on MoHPC.8. Katie Wasserman – email exchange regarding HP29C.
RESTORATION of an HP 29C CALCULATOR
Thank you!
© All rights reserved regarding the information contained in this presentation . If you have any questions you may contact Jim Johnson. Email: [email protected]
RESTORATION of an HP 29C CALCULATOR
APPENDIX
RESTORATION of an HP 29C CALCULATOR
Single level HP 29C Power Supply Integrated into Main PC BoardSN: 1904S21718
Additional photos
RESTORATION of an HP 29C CALCULATORSocketed HP 29C PC Board
RESTORATION of an HP 29C CALCULATORAdditional Waveforms
ɸ2Pin# 16
DataPin# 11
IsaPin# 10
ɸ1Pin# 17
HP 25 Calculator Waveforms
ɸ1 & ɸ2
Data & ɸ1
Data & ɸ2
Isa &ɸ1
Sync & ɸ2
Display