Commodore PET 2001 Service Documentation - Revision history

Josh: 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

2026-09-25T01:09:28Z

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&nbsp;V, a +85&nbsp;V boost rail, &minus;30&nbsp;V and roughly '''+10&nbsp;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&ndash;CR22, C1, VR1, the +85&nbsp;V boost and &minus;30&nbsp;V rails, the flyback T2 and the +10&nbsp;kV anode supply, and the deflection yoke figures.</ref>
 * The master crystal Y1 is '''8&nbsp;MHz'''.<ref name="msch" />
 == Other PET material hosted here ==

Josh: Link the two PET documents this drive documented: Commodore drawing 320130 sheet 1 and the third-party PET-Shack bundle, with what each does and does not contain (P4 orphan fix)

2026-09-25T00:29:19Z

Link the two PET documents this drive documented: Commodore drawing 320130 sheet 1 and the third-party PET-Shack bundle, with what each does and does not contain (P4 orphan fix)

← Older revision		Revision as of 01:29, 25 September 2026
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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" />

			== 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 ==

Josh: 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

2026-09-22T17:24:23Z

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

New page

<templatestyles src="Template:StyledTable/styles.css" />
[[File:Commodore PET 2001 Open.jpg|thumb|400px|A PET 2001-8 with the top raised. The main logic assembly lies flat under the keyboard; the display assembly is mounted on the CRT at the front.]]

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 ==

* '''[[:File:Commodore PET 2001 Main Logic Assembly Parts List.pdf|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.
* '''[[:File:Commodore PET 2001 Display Assembly Parts List.pdf|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 ==

* '''[[:File:Commodore PET 2001 Main Logic Schematic (320008).pdf|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.
* '''[[:File:Commodore PET 2001 Display Circuit Schematic.pdf|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 ==

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.<ref name="msch">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.</ref>

{| class="wikitable styled-table" style="width:100%; text-align:left;"
|+'''Original PET 2001 ("static") board assemblies'''
! 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]].<ref name="zim">[http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/ 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.</ref>

== What these documents establish ==

* 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.<ref name="mla">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.</ref>
* The 4700 µF 25 V reservoir is '''C1 on the display assembly''', not on the system board.<ref name="disp">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.</ref>
* The main logic board carries '''no voltage regulator'''. It receives +5 V and a +9 V unregulated rail from elsewhere in the machine.<ref name="mla" />
* 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" />

== Related pages ==

* [[Commodore PET 2001]] · [[Commodore PET 2001 General Maintenance]] · [[Commodore PET 2001 Troubleshooting]] · [[Commodore PET 2001 Capacitor Replacement Guide]]
* [[Commodore PET 4000 Series Technical Manual]]

== References ==

<references />

[[Category:Commodore Documentation]]
[[Category:Commodore Technical Manuals]]