Commodore PET 2001 Service Documentation: Difference between revisions
Create: index of Commodore's four PET 2001 service documents now hosted here (two parts lists, two schematics), with the four static-board assemblies from Commodore's own schematic note |
Index the full PET 2001 drawing set sheet by sheet - 24 document pages that were reachable from no article. Notes what each sheet settles and that the 'Rev 2'/'Rev 3' titles are wiki numbering, not Commodore's |
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* The display assembly generates +12 V, a +85 V boost rail, −30 V and roughly '''+10 kV''' for the CRT anode.<ref name="dsch">Commodore Business Machines, ''Schematic, Service, Display Circuit'' for the PET 2001, with the supplementary sheet of oscilloscope settings. Hosted here as [[:File:Commodore PET 2001 Display Circuit Schematic.pdf]]. Shows CR19–CR22, C1, VR1, the +85 V boost and −30 V rails, the flyback T2 and the +10 kV anode supply, and the deflection yoke figures.</ref> | * The display assembly generates +12 V, a +85 V boost rail, −30 V and roughly '''+10 kV''' for the CRT anode.<ref name="dsch">Commodore Business Machines, ''Schematic, Service, Display Circuit'' for the PET 2001, with the supplementary sheet of oscilloscope settings. Hosted here as [[:File:Commodore PET 2001 Display Circuit Schematic.pdf]]. Shows CR19–CR22, C1, VR1, the +85 V boost and −30 V rails, the flyback T2 and the +10 kV anode supply, and the deflection yoke figures.</ref> | ||
* The master crystal Y1 is '''8 MHz'''.<ref name="msch" /> | * The master crystal Y1 is '''8 MHz'''.<ref name="msch" /> | ||
== The full drawing set, sheet by sheet == | |||
The same documents are also held here as individual high-resolution sheets, which is the form to cite when you want one specific drawing rather than a whole PDF. Every page says what is on its own sheet and what is not. | |||
=== Main logic assembly === | |||
* '''[[System Board Parts List (1 of 3)]]''' — ''Main Logic Assembly Parts Cross Reference'', sheet 1: capacitors, diodes, transistors, connectors and resistors with Commodore part numbers. Establishes that '''only C7–C10 are aluminium electrolytic''' on the whole board. | |||
* '''[[System Board Parts List (2 of 3)]]''' — sheet 2, the IC cross-reference: 6502 at UF3, 6520 PIAs at UB8/UG8, 6522 VIA at UA5, and the '''6550-versus-2114 RAM line printed twice''' against the same eighteen positions, which is how Commodore expressed the difference between the board assemblies. | |||
* '''[[System Board Parts List (3 of 3)]]''' — sheet 3, the remaining ROMs and the socket types. Records a '''revised UH1 ROM''' (6540-019 / 2316B-09, parts 901439-09 / 901447-09) found nowhere else in Commodore's PET 2001 documents held here, and makes plain that the '''6540 is a 28-pin part and the 2316B a 24-pin part'''. | |||
* '''[[2001 Main Logic Assembly]]''' — the same three sheets as one PDF. The file is byte-identical to [[:File:Commodore PET 2001 Main Logic Assembly Parts List.pdf]]. | |||
There is '''no component-placement drawing for the main logic board''' on this wiki. The display assembly has one; the system board does not. | |||
=== Main logic schematics, by board assembly === | |||
Sheet 1 of every set is the same universal drawing, '''#320130''', ''Circuitry common to all PET computers''. Sheets 2 (Memory Section) and 3 (Video Logic) are the board-specific drawings. | |||
{| class="wikitable styled-table" style="width:100%; text-align:left;" | |||
! Board !! Complete set !! Sheet 2 — Memory !! Sheet 3 — Video logic | |||
|- | |||
| '''320008''' || [[Schematic 320026 (Complete, Board 320008)]] || [[Schematic 320026 (Sheet 2 of 3, Board 320008)]] || [[Schematic 320026 (Sheet 3 of 3, Board 320008)]] | |||
|- | |||
| '''320081''' || [[Schematic 320082 (Complete, Board 320081)]] || [[Schematic 320082 (Sheet 2 of 3, Board 320081)]] || [[Schematic 320082 (Sheet 3 of 3, Board 320081)]] | |||
|- | |||
| '''320132''' || [[Schematic 320130 (Complete, Board 320132)]] || [[Schematic 320130 (Sheet 2 of 3, Board 320132)]] || [[Schematic 320130 (Sheet 3 of 3, Board 320132)]] | |||
|- | |||
| '''320137''' || [[Schematic 320135 (Complete, Board 320137)]] || [[Schematic 320135 (Sheet 2 of 3, Board 320137)]] || [[Schematic 320135 (Sheet 3 of 3, Board 320137)]] | |||
|} | |||
Circuits marked with an asterisk on sheets 2 and 3 are annotated '''"all ckts marked * are for BC machine only"''' — the business-keyboard variant. | |||
=== Display assembly (the monitor ''and'' the power supply) === | |||
Commodore calls this the '''display assembly'''; several page titles here call it the "video board". It carries the mains transformer, the bridge, the 4700 µF reservoir, the +12 V regulator, the −30 V and +85 V rails and the flyback, so it is where a PET power-supply fault lives. | |||
* '''[[Video Board Parts Layout]]''' — ''Display PCB Assembly'', the '''component-placement drawing, with a designator and a value against every fitted position'''. The most directly useful document of the set: it identifies a part without tracing the circuit. It is also the drawing that settles '''VR1 = 7812''' and '''C22/C27 = 3.3 µF''', and it documents the '''TIP-55A substitution for Q14'''. | |||
* '''[[Video Board Schematic]]''' — ''Schematic, Service, Display Circuit'', with '''fourteen waveform photographs''' and five service notes (R20 mounts perpendicular for screwdriver adjustment; R9 is at the rear on a 2-inch shaft; Molex 09-64-1021 and 09-64-1061 board connectors; parenthesised numbers are the DOK flyback version). | |||
* '''[[Schematic Notes for Video Board]]''' — the '''oscilloscope settings for those fourteen photographs'''. Volts and time per division for each, and the only absolute amplitude Commodore published for any of them: '''picture 9, 11.6 V peak'''. The schematic and this supplement are useless apart. | |||
* '''[[Video Board Schematic (Rev 2, 320032)]]''' — Commodore drawing '''#320032 rev A''', ''Display Schematic'', drawn 3-9-76, last revised 6-15-77. | |||
* '''[[Video Board Schematic (Rev 3, 320033)]]''' — Commodore drawing '''#320033 rev P''', size D, ''Schematic, Display Circuit'', engineering-approved 29 June 1978, next assembly #320012. | |||
* '''[[Video Board Parts List (1 of 3)]]''' · '''[[Video Board Parts List (2 of 3)]]''' · '''[[Video Board Parts List (3 of 3)]]''' — ''Display Assembly Component Cross Reference'', items 1–70 with Commodore part numbers, including the yoke assembly (320078) and the bare PCB (320084-02). | |||
'''"Rev 2" and "Rev 3" in those two page titles are this wiki's numbering, not Commodore's.''' 320032 and 320033 are different drawing numbers carrying their own revision marks A and P; they are not two revisions of one drawing. Check the number against your own machine's paperwork, or the values on your own board. | |||
== Other PET material hosted here == | |||
* '''[[Schematic 320130 (Sheet 1 of 3, Static PET)]]''' — Commodore drawing 320130 sheet 1, ''PET Computer Main Logic, circuitry common to all PET computers'', as a single image. The 6502 at F3, both 6520 PIAs, the 6522 VIA, the three MC3446 IEEE-488 transceivers at A7–A9, the LM555 retrace timer at E9, the cassette drive circuitry and the keyboard pull-ups. No regulator: the board takes +5 V and +9 V unregulated from elsewhere. | |||
* '''[[PET Shack Service Bundle]]''' — a 37-page '''third-party''' compilation sold by PET-Shack of Mishawaka, Indiana. Not Commodore documentation, and secondary to the parts lists above, but it carries things Commodore's own PET 2001 documents here do not: an errata sheet against the published schematics, the cassette deck circuit with values, a capacitors sheet including a '''0.0047 µF 1 kV''' part, the TIP29/TIP30 supply pass transistors, and manufacturer data sheets for the 6550, the Synertek 6502/6520/6522 and the MC3446 bus transceivers. | |||
== Related pages == | == Related pages == | ||
* [[Commodore PET 2001]] · [[Commodore PET 2001 General Maintenance]] · [[Commodore PET 2001 Troubleshooting]] · [[Commodore PET 2001 Capacitor Replacement Guide]] | * [[Commodore PET 2001]] · [[Commodore PET 2001 General Maintenance]] · [[Commodore PET 2001 Troubleshooting]] · [[Commodore PET 2001 Capacitor Replacement Guide]] | ||
* [[Commodore PET 4000 Series Technical Manual]] | * [[Commodore PET 4000 Series Technical Manual]] — P/N 990438, the ''universal dynamic PET'' board drawing 8032090, which covers the 8032, 4032, 4016 and SuperPET 9000 | ||
== References == | == References == | ||
Latest revision as of 02:09, 25 September 2026
Commodore's own service documentation for the Commodore PET 2001 survives in reasonable completeness. Four documents are hosted here, and together they cover both assemblies inside the machine at component level.
They are the source for every figure on Commodore PET 2001 Capacitor Replacement Guide.
Parts lists
[edit | edit source]- 8K Main Logic Assembly Parts Cross Reference — every component on the system board by reference designator, description and Commodore part number. Carries a text layer.
- Display Assembly Component Cross Reference — the same for the 9-inch monitor and power board, which is also where the machine's mains transformer and reservoir capacitor live.
Schematics
[edit | edit source]- Main logic schematic, assembly 320008 — three sheets. Sheet 1 is drawing 320130, circuitry common to all PET computers; sheets 2 and 3 are drawing 320026 and are specific to assembly 320008.
- Schematic, Service, Display Circuit — the monitor and supply board, with the oscilloscope settings for the waveform photographs printed on the drawing.
The four original board assemblies
[edit | edit source]Commodore's note on sheet 3 of the main logic schematic records that all component locations are the same on all four boards; only the fitted components differ, and the identifying board number is silkscreened in the upper left corner.[1]
| Assembly | ROMs | RAM | Schematic |
|---|---|---|---|
| 320008 | 6540 | 6550 | 320026 |
| 320081 | 2316B | 6550 | 320082 |
| 320132 | 6540 | 2114 | 320130 |
| 320137 | 2316B | 2114 | 320135 |
All four are variants of the original static board. The later 2001-N / 3000 / 4000 dynamic system board is a different design and is not covered by these documents; for those machines see Commodore PET 4000 Series.[2]
What these documents establish
[edit | edit source]- The only aluminium electrolytics on the main logic board are C7–C10, 47 µF 16 V. C5, C11, C12 and C13 are 1 µF 25 V tantalums; C15–C49 are 0.1 µF ceramics.[3]
- The 4700 µF 25 V reservoir is C1 on the display assembly, not on the system board.[4]
- The main logic board carries no voltage regulator. It receives +5 V and a +9 V unregulated rail from elsewhere in the machine.[3]
- The display assembly generates +12 V, a +85 V boost rail, −30 V and roughly +10 kV for the CRT anode.[5]
- The master crystal Y1 is 8 MHz.[1]
The full drawing set, sheet by sheet
[edit | edit source]The same documents are also held here as individual high-resolution sheets, which is the form to cite when you want one specific drawing rather than a whole PDF. Every page says what is on its own sheet and what is not.
Main logic assembly
[edit | edit source]- System Board Parts List (1 of 3) — Main Logic Assembly Parts Cross Reference, sheet 1: capacitors, diodes, transistors, connectors and resistors with Commodore part numbers. Establishes that only C7–C10 are aluminium electrolytic on the whole board.
- System Board Parts List (2 of 3) — sheet 2, the IC cross-reference: 6502 at UF3, 6520 PIAs at UB8/UG8, 6522 VIA at UA5, and the 6550-versus-2114 RAM line printed twice against the same eighteen positions, which is how Commodore expressed the difference between the board assemblies.
- System Board Parts List (3 of 3) — sheet 3, the remaining ROMs and the socket types. Records a revised UH1 ROM (6540-019 / 2316B-09, parts 901439-09 / 901447-09) found nowhere else in Commodore's PET 2001 documents held here, and makes plain that the 6540 is a 28-pin part and the 2316B a 24-pin part.
- 2001 Main Logic Assembly — the same three sheets as one PDF. The file is byte-identical to File:Commodore PET 2001 Main Logic Assembly Parts List.pdf.
There is no component-placement drawing for the main logic board on this wiki. The display assembly has one; the system board does not.
Main logic schematics, by board assembly
[edit | edit source]Sheet 1 of every set is the same universal drawing, #320130, Circuitry common to all PET computers. Sheets 2 (Memory Section) and 3 (Video Logic) are the board-specific drawings.
Circuits marked with an asterisk on sheets 2 and 3 are annotated "all ckts marked * are for BC machine only" — the business-keyboard variant.
Display assembly (the monitor and the power supply)
[edit | edit source]Commodore calls this the display assembly; several page titles here call it the "video board". It carries the mains transformer, the bridge, the 4700 µF reservoir, the +12 V regulator, the −30 V and +85 V rails and the flyback, so it is where a PET power-supply fault lives.
- Video Board Parts Layout — Display PCB Assembly, the component-placement drawing, with a designator and a value against every fitted position. The most directly useful document of the set: it identifies a part without tracing the circuit. It is also the drawing that settles VR1 = 7812 and C22/C27 = 3.3 µF, and it documents the TIP-55A substitution for Q14.
- Video Board Schematic — Schematic, Service, Display Circuit, with fourteen waveform photographs and five service notes (R20 mounts perpendicular for screwdriver adjustment; R9 is at the rear on a 2-inch shaft; Molex 09-64-1021 and 09-64-1061 board connectors; parenthesised numbers are the DOK flyback version).
- Schematic Notes for Video Board — the oscilloscope settings for those fourteen photographs. Volts and time per division for each, and the only absolute amplitude Commodore published for any of them: picture 9, 11.6 V peak. The schematic and this supplement are useless apart.
- Video Board Schematic (Rev 2, 320032) — Commodore drawing #320032 rev A, Display Schematic, drawn 3-9-76, last revised 6-15-77.
- Video Board Schematic (Rev 3, 320033) — Commodore drawing #320033 rev P, size D, Schematic, Display Circuit, engineering-approved 29 June 1978, next assembly #320012.
- Video Board Parts List (1 of 3) · Video Board Parts List (2 of 3) · Video Board Parts List (3 of 3) — Display Assembly Component Cross Reference, items 1–70 with Commodore part numbers, including the yoke assembly (320078) and the bare PCB (320084-02).
"Rev 2" and "Rev 3" in those two page titles are this wiki's numbering, not Commodore's. 320032 and 320033 are different drawing numbers carrying their own revision marks A and P; they are not two revisions of one drawing. Check the number against your own machine's paperwork, or the values on your own board.
Other PET material hosted here
[edit | edit source]- Schematic 320130 (Sheet 1 of 3, Static PET) — Commodore drawing 320130 sheet 1, PET Computer Main Logic, circuitry common to all PET computers, as a single image. The 6502 at F3, both 6520 PIAs, the 6522 VIA, the three MC3446 IEEE-488 transceivers at A7–A9, the LM555 retrace timer at E9, the cassette drive circuitry and the keyboard pull-ups. No regulator: the board takes +5 V and +9 V unregulated from elsewhere.
- PET Shack Service Bundle — a 37-page third-party compilation sold by PET-Shack of Mishawaka, Indiana. Not Commodore documentation, and secondary to the parts lists above, but it carries things Commodore's own PET 2001 documents here do not: an errata sheet against the published schematics, the cassette deck circuit with values, a capacitors sheet including a 0.0047 µF 1 kV part, the TIP29/TIP30 supply pass transistors, and manufacturer data sheets for the 6550, the Synertek 6502/6520/6522 and the MC3446 bus transceivers.
Related pages
[edit | edit source]- Commodore PET 2001 · Commodore PET 2001 General Maintenance · Commodore PET 2001 Troubleshooting · Commodore PET 2001 Capacitor Replacement Guide
- Commodore PET 4000 Series Technical Manual — P/N 990438, the universal dynamic PET board drawing 8032090, which covers the 8032, 4032, 4016 and SuperPET 9000
References
[edit | edit source]- ↑ 1.0 1.1 Commodore Business Machines, PET Computer Main Logic schematic, drawings 320130 (sheet 1) and 320026 (sheets 2–3), for board assembly 320008. Hosted here as File:Commodore PET 2001 Main Logic Schematic (320008).pdf. Sheet 3 carries Commodore's note that component locations are common to assemblies 320008, 320081, 320132 and 320137.
- ↑ zimmers.net Commodore PET schematics index. Directory listing distinguishing the original 2001 static board from the 2001N/3000/4000 dynamic system board, and naming the four static-board variants and their schematic numbers. A secondary source for the directory structure; the assembly numbers themselves are confirmed by Commodore's own note on the schematic.
- ↑ 3.0 3.1 Commodore Business Machines, 8K Main Logic Assembly Parts Cross Reference for the PET 2001. Hosted here as File:Commodore PET 2001 Main Logic Assembly Parts List.pdf. Gives every component on the system board by reference designator, description and Commodore part number.
- ↑ Commodore Business Machines, Display Assembly Component Cross Reference for the PET 2001. Hosted here as File:Commodore PET 2001 Display Assembly Parts List.pdf. Numbered list of every component on the monitor and supply board.
- ↑ Commodore Business Machines, Schematic, Service, Display Circuit for the PET 2001, with the supplementary sheet of oscilloscope settings. Hosted here as File:Commodore PET 2001 Display Circuit Schematic.pdf. Shows CR19–CR22, C1, VR1, the +85 V boost and −30 V rails, the flyback T2 and the +10 kV anode supply, and the deflection yoke figures.