Editing System Board Parts List (1 of 3)

'''Sheet 1 of Commodore's ''Main Logic Assembly Parts Cross Reference''''' for the [[Commodore PET 2001]] — passives, discretes and connectors. Commodore Business Machines, Inc., Palo Alto, California, scanned at 400 dpi.

'''Commodore's own title for this document is ''Main Logic Assembly Parts Cross Reference''''', not "System Board Parts List". It lists every component on the PET's system board by reference designator, description and Commodore part number.

Sheet 1 is the header sheet and carries the '''passive and discrete''' half of the list:

<templatestyles src="Template:StyledTable/styles.css" />
{{| class="wikitable styled-table"
|-
! Ref !! Description !! Commodore part no.
|-
| C1, C2, C14 || 0.01 µF 100 V ceramic || 900010-38
|-
| C3 || 82 pF 500 V ceramic || 900010-40
|-
| C4 || 10 pF 500 V ceramic || 900010-35
|-
| '''C5, C11, C12, C13''' || '''1.0 µF 25 V tantalum''' || 900402-13
|-
| C6 || 0.1 µF 50 V ceramic || 900010-20
|-
| '''C7–C10''' || '''47 µF 16 V electrolytic''' || 900100-33
|-
| C15–C49 || 0.1 µF 10 V ceramic || 900010-39
|-
| CR1, CR2, CR3 || 1N5402 3 A / 200 V || 900753-01
|-
| DS1 || LED indicator || 900701-01
|-
| J5 / J7 / J8 || 20-pin / 7-pin / 5-pin Molex headers || 903307-02, 903307-02, 903302-02
|-
| Q1, Q4 || TIP29 || 902653-01
|-
| Q2, Q5 || 2N4401 || 902652-01
|-
| Q3, Q6 || 2N3904 || 902658-01
|-
| R18–R25 || 10 k 1/4 W 5 % — the eight keyboard row pull-ups || 901550-20
|-
| R15, R16 || 1 M 1/4 W 5 % || 901550-84
|-
| UA1, UB5, UC9 || 74LS93 counter || 901521-07
|}}

'''Only four positions on the whole board are aluminium electrolytic: C7, C8, C9 and C10.''' Everything else in the C range is a ceramic or a tantalum, and neither ages the way an electrolytic does.

== What this document does not cover ==
The PET 2001's '''power supply and monitor are a separate assembly''' with their own parts list — see [[Video Board Parts List (1 of 3)]]. Nothing on this sheet is a voltage regulator, because '''the PET 2001 main logic board has none'''; it receives +5 V and +9 V unregulated from elsewhere in the machine.

== Related pages ==
* The other sheets: [[System Board Parts List (2 of 3)]] · [[System Board Parts List (3 of 3)]]
* [[2001 Main Logic Assembly]] — the same three sheets as a single PDF
* [[Commodore PET 2001 Service Documentation]] · [[Commodore PET 2001 Capacitor Replacement Guide]] · [[Commodore PET 2001 Troubleshooting]]
* [[Schematic 320130 (Sheet 1 of 3, Static PET)]] — the circuit these parts sit in

[[File:parts-1.gif|thumb|600px|Commodore ''Main Logic Assembly Parts Cross Reference'', sheet 1 of 3.]]

Download: [[:File:parts-1.gif|parts-1.gif]]

[[Category:Commodore PET 2001 Schematics]]
[[Category:Commodore Documentation]]