Video Board Parts List (1 of 3)
Sheet 1 of Commodore's Display Assembly Component Cross Reference for the Commodore PET 2001 — capacitors, diodes and the first connectors. 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. |- | C1 || 4700 µF / 25 V electrolytic — the main reservoir || 900100-45 |- | C3, C12, C13, C17 || 47 µF / 16 V electrolytic || 900100-33 |- | C4 || 0.1 µF / 100 V ceramic || 900010-32 |- | C9 || 1.0 µF / 25 V electrolytic || 900100-32 |- | C10, C24 || 0.001 µF / 200 V or greater || 900010-07 |- | C11 || 0.0022 µF / 200 V or greater || 900010-34 |- | C14 || 0.15 µF / 200 V Mylar || 900151-10 |- | C15 || 470 µF / 16 V electrolytic || 900100-40 |- | C16 || 0.1 / 50 V || 900010-20 |- | C18 || 27 pF / 500 V 10 % ceramic disc || 900010-28 |- | C20, C30 || 220 pF / 500 V 10 % ceramic disc || 900010-29 |- | C22, C27 || printed as "33 µF / 200 V or 4.7 µF / 250 V" — see the note below || 900100-02 |- | C23 || 220 µF / 25 V electrolytic || 900100-03 |- | C25 || 0.022 or 0.047 µF / 200 V 10 % Mylar || 900151-03 |- | C26 || 0.0047 µF / 200 V or greater || 900010-31 |- | C28 || 10 µF / 25 V non-polarised electrolytic || 900103-01 |- | C29 || 820 pF ceramic disc || 900010-30 |- | CR1–CR6, CR8 || 1N4148 || 900850-01 |- | CR7 || 1N4752 33 V 1 W zener || 900940-01 |- | CR19–CR22 || 1N5402 3 A / 200 V — the mains bridge || 900753-01 |- | FB1 || RF beads || 901330-01 |- | H1, H2 || TO-220 heatsinks || 901901-01 |- | J1 / J2 || 6-pin / 2-pin headers || 903302-06 / 903302-01 |}}
The C22 / C27 discrepancy, and how it resolves. This sheet prints the line as "33MF/200V or 4.7MF/250V". Two other Commodore drawings disagree with it: the display circuit schematic marks both positions 3.3 µF 200 V, and the component-placement drawing at Video Board Parts Layout marks both "3.3 µF 200 V or 160 V". Two drawings against one parts-list line, and the listed alternative of 4.7 µF only makes sense beside 3.3 µF, not beside 33 µF. Treat C22 and C27 as 3.3 µF — fitting 33 µF there is a tenfold error in a flyback-derived supply. Read the value off your own board before ordering.
Related pages
[edit | edit source]- The other sheets: Video Board Parts List (2 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-4.gif