Video Board Schematic (Rev 3, 320033)
Commodore drawing #320033, revision P, size D, sheet 1 of 1, titled SCHEMATIC, DISPLAY CIRCUIT — the Commodore PET 2001 display assembly circuit. Drawn May 1978 and signed off by engineering 6-29-78; the title block gives the next assembly as #320012. Scanned at 400 dpi.
"Rev 3" in this page's title is this wiki's numbering, not Commodore's. The drawing's own revision mark is P, and 320033 is a different drawing number from 320032, not a later revision of it. This is the latest-dated of the three display schematics held here.
"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 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. |
What is on the sheet
[edit | edit source]The display-assembly circuit at component level. Among the devices named on the drawing are the 1N4935 fast-recovery rectifiers, and the sheet marks the −30 V rail.
What it does not contain
[edit | edit source]No parts list, no placement drawing and no waveform photographs. See Video Board Parts List (1 of 3) and Video Board Parts Layout.
Related pages
[edit | edit source]- Video Board Schematic — the service version, with waveform photographs and service notes
- Video Board Schematic (Rev 2, 320032) — the 1976/77 drawing
- Video Board Parts Layout · Commodore PET 2001 Service Documentation · Commodore PET 2001 Capacitor Replacement Guide · CRT Discharge Procedure
Download: video-3.gif