Early
Electronic
Calculator		 Hewlett-Packard 9825B Calculator

Manufacturer: Hewlett-Packard
Model: 9825B
Year: 1977
Form: Desktop
Functions: Scientific, programmable, tape storage
Number of Digits: 12 fixed, 12 mantissa + 2 exponent
Display Type: LED
Logic Technology: LSI
Tech. Data Level: 1

Notes:

- Unit Log -

Serial Number: 1622A04584 "#1"
Year of Manufacture: 1980 (ICs on top two boards stamped with 8035).
Date of Receipt: Jan 2002
Source: UBC SERF.
State upon Receipt: Partially dismantled.
Current State: Fully functional except state of tape drive unknown (26 Mar 2002).

Date: 2002 Mar
Procedure: (Note) ICs on CPU and tape boards stamped with 1977 date codes, ICs on keyboard/printer board are 1976. Board IDs in this unit: CPU: , TAPE: , ROM: , RAM: , KBD: .

Date: 2002 Mar 20
Procedure: Keyboard replaced with unit from 1014A00435.

Date: 2002 Mar 24
Procedure: Cleaned.

Date: 2002 Mar 24
Procedure: Broken rear top case section glued back together.

Date: 2002 Mar 25
Symptoms: Printer excessively noisy and produces "double" line feeds.
Solution: Decayed bumpers on solenoid replaced.

Date: 2013 Feb
Symptoms: Powered up. Functions but fails after board swapping with unit 435.
Solution: Board swapping isolates problem to CPU board. Processor module removed from board, contacts and compression strips cleaned with alcohol, other board contacts cleaned as well, reinstalled. Functional.

Date: 2013 Feb
Symptoms: Printer drive slipping, producing squashed lines.

- Unit Log -

Serial Number: 1014A00435 "#2"
Year of Manufacture: 1980 (shipping sticker dated 17 Sep 1980)
Date of Receipt: Jan 2002
Source: UBC SERF.
State upon Receipt: Partially dismantled.
Current State: Fully functional except state of tape drive unknown (22 Mar 2002).

Date: 2002 Mar
Procedure: Board IDs in this unit: CPU: , TAPE: , ROM: , RAM: , KBD: .

Date: 2002 Mar 20
Procedure: Cleaned.

Date: 2002 Mar 20
Symptoms: Keyboard sticky.
Solution: Keyboard replaced with unit from 1976 9825B.

Date: 2002 Mar 20
Symptoms: Printer excessively noisy and produces "double" line feeds.
Solution: Decayed bumpers on solenoid replaced.

Date: 2002 Mar 22
Symptoms: No input from numeric 9 key.
Solution: Numeric 9 key swapped with f11 key, bad key opened, cleaned, replaced in f11 location.

Date: 2013 Feb
Symptoms: Powered up, not functional.
Procedure: Board swapping isolates problem to ROM board. Not functional.

- Unit Log -

Serial Number: 1003A13784 (Jurgen's 9825A)
Year of Manufacture: 1980 (shipping sticker dated 21 May 1980)
Date of Receipt: Jan 2002
Source: UBC SERF.
State upon Receipt: Partially dismantled.
Current State: Fully functional except for tape drive (29 Mar 2002).

Date: 28 Mar 2002
Procedure: Cleaned.

Date: 28 Mar 2002
Symptoms: Some keys feel rough or stick down.
Solution: The worst keys injected with a dab of lubricated contact cleaner: ERASE LIST RECALL f8 % Y S F P GAZINTA ) 8 =

Date: 29 Mar 2002
Symptoms: Display intermittent.
Solution: Ribbon cable connector from main logic to keyboard/display board replaced with new connector.

Date: 29 Mar 2002
Symptoms: Printer excessively noisy and produces "double" line feeds.
Solution: Decayed bumpers on solenoid replaced.


  Hewlett-Packard 9825B
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