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Video Board Parts List (2 of 3)

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Sheet 2 of Commodore's Display Assembly Component Cross Reference for the Commodore PET 2001 gives items 25 to 53 of the 70-item list: the two RF chokes, the transistors and the first resistors, by reference designator, description and Commodore part number. Sheet 1 has the capacitors, diodes and connectors, and sheet 3 the remaining resistors, spark gaps, transformers and regulator. The sheet carries the Commodore Business Machines, Palo Alto letterhead. The scan comes from the zimmers.net Commodore archive, which files it as the parts list for the video board.[1]

Commodore calls this board the display assembly. It runs the monitor from low-voltage AC supplied by the transformer in the case; see Video Board Parts List (1 of 3) for the supplies it generates.

Contents

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Sheet 2, items 25-53, as printed
Item Ref. des. Description Part no.
25 L1 RF choke, Miller 5250 901300-01
26 L2 RF choke, Miller 4632 901300-02
27 Q1, Q11 2N2369 902683-01
28 Q2, Q13 2N4401 902652-01
29 Q3, Q6, Q7, Q8 2N3904 902658-01
30 Q10 TIP30 PNP 902727-01
31 Q12 2N3906 902707-01
32 Q14 MJE13006 or SJE1685 902684-01
33 R1, R12, R37 3.6 kΩ 1/4 W 5 % 901550-78
34 R2, R44 2.2 kΩ 1/4 W 5 % 901550-18
35 R3 430 Ω 1/4 W 5 % 901550-77
36 R4 1.5 kΩ 1 W 901650-11
37 R5 2.2 kΩ 2 W 901700-07
38 R6, R7, R11 100 Ω 1/2 W 5 % 901600-29
39 R8 8.2 Ω 1/2 W 5 % 901600-26
40 R9 100 kΩ potentiometer 902259-01
41 R10 100 Ω 1/4 W 5 % 901550-49
42 R15 10 kΩ 1/4 W 5 % 901550-20
43 R20 1 MΩ potentiometer 902258-01
44 R21, R30 330 kΩ 1/4 W 5 % 901550-80
45 R22 82 kΩ 1/4 W 5 % 901550-42
46 R23, R33 1 kΩ 1/4 W 5 % 901550-01
47 R24 22 kΩ 1/4 W 5 % 901550-12
48 R25, R26 270 Ω 1/2 W 5 % 901600-31
49 R27 160 kΩ 1/4 W 5 % 901550-79
50 R28, R32 2.2 Ω 1/2 W 5 % 901600-28
51 R29 220 Ω 1/2 W 5 % 901600-31
52 R31 39 kΩ 1/4 W 5 % 901550-21
53 R34, R41 10 Ω 1/4 W 5 % 901550-64

Reading the sheet

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Items 48 and 51 print the same part number, 901600-31, for a 270 Ω resistor and a 220 Ω resistor; one of the two is a misprint. Check the colour bands on the board.

The two potentiometers are the display's adjustments. The service schematic labels R9 "brightness" and R20 "vert. size", and its notes say 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.[2]

The list gives MJE13006 or SJE1685 for Q14. The service schematic adds TIP55A as a third choice, and the placement drawing shows how to fit a TIP-55A on heatsink H2.[2][3]

What the parts list does not contain

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Q9, the TIP29 in the vertical output stage, is on the schematic and the placement drawing but not on this sheet.[2][3]

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Parts-5
Commodore Display Assembly Component Cross Reference, sheet 2 of 3.

Download: parts-5.gif

References

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  1. ↑ zimmers.net Commodore archive, /pub/cbm/schematics/computers/pet/2001/ directory listing (retrieved 2026-10-01). Source of parts-4.gif to parts-6.gif ("parts list for the video board").
  2. ↑ 2.0 2.1 2.2 Commodore Business Machines, Schematic, Service, Display Circuit for the PET 2001, hosted as File:video-1.gif and described at Video Board Schematic. Labels R9 "brightness" and R20 "vert. size"; notes 2 and 3 give their mounting. Also lists TIP55A as an alternative for Q14 and shows Q9 as a TIP29.
  3. ↑ 3.0 3.1 Commodore Business Machines, Display PCB Assembly component-placement drawing for the PET 2001, hosted as File:video-layout.gif and described at Video Board Parts Layout. Marks Q9 as a TIP29 and includes a "Detail of substitution TR. Q14 and heat sink H2" for a TIP-55A.
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