Video Board Parts List (2 of 3)
Sheet 2 of Commodore's Display Assembly Component Cross Reference for the Commodore PET 2001 — inductors, transistors and the first half of the resistors. Commodore Business Machines, Inc., Palo Alto, California, scanned at 400 dpi. The list is numbered 1–70 across the three sheets.
"Video board" is this wiki's word, not Commodore's. Commodore calls it the display assembly, and it is the machine's power supply as well as its monitor — the mains transformer, the bridge rectifier, the 4700 µF reservoir, the +12 V regulator, the −30 V and +85 V rails and the flyback are all on it. Anyone looking for the PET 2001's PSU documentation is looking for this board.
 | The display assembly is the PET's power supply as well as its monitor. Mains voltage is present on it whenever the machine is plugged in, the CRT anode runs at roughly +10 kV from flyback T2, and C1 is a 4700 µF reservoir that stores real energy. Read CRT Discharge Procedure before working on this board. |
{{| class="wikitable styled-table" |- ! Ref !! Description !! Commodore part no. |- | L1 || RF choke, Miller 5250 || 901300-01 |- | L2 || RF choke, Miller 4632 || 901300-02 |- | Q1, Q11 || 2N2369 || 902683-01 |- | Q2, Q13 || 2N4401 || 902652-01 |- | Q3, Q6, Q7, Q8 || 2N3904 || 902658-01 |- | Q10 || TIP30 PNP || 902727-01 |- | Q12 || 2N3906 || 902707-01 |- | Q14 || MJE13006 or SJE1685 — the horizontal output transistor || 902684-01 |- | R4 || 1.5 k 1 W || 901650-11 |- | R5 || 2.2 k 2 W || 901700-07 |- | R8 || 8.2 Ω 1/2 W 5 % || 901600-26 |- | R9 || 100 k potentiometer || 902259-01 |- | R20 || 1 M potentiometer || 902258-01 |- | R28, R32 || 2.2 Ω 1/2 W 5 % || 901600-28 |}}
The two potentiometers are the display's only user-serviceable adjustments in this list, and the display schematic adds where they are: R20 is mounted perpendicular to the board for screwdriver adjustment, and R9 sits at the rear of the PCB on a 1/4-inch shaft about 2 inches long.
Related pages
[edit | edit source]- The other sheets: Video Board Parts List (1 of 3) · Video Board Parts List (3 of 3)
- Video Board Schematic — the circuit these parts sit in, with 14 waveform photographs
- Video Board Parts Layout — where each of them physically is, with a value against every position
- Schematic Notes for Video Board — the oscilloscope settings for those waveform photographs
- Commodore PET 2001 Capacitor Replacement Guide — which takes its display-assembly values from this list
- Commodore PET 2001 Service Documentation · CRT Discharge Procedure · Capacitor Failure Symptoms
Download: parts-5.gif