Commodore 64C Capacitor Replacement Guide: Difference between revisions
Rewrite from Commodore's 250469-01 parts list: previous page listed C88/C89/C90 as electrolytics, but those are ceramics on this board. Banner removed; fully cited. |
Point citations at the existing service manual page rather than the duplicate |
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Recapping a '''[[Commodore 64C]]''' — and any [[Commodore 64]] built on the '''250469 "short board"''' — restores stable supply rails and removes a common source of audio and video noise. | Recapping a '''[[Commodore 64C]]''' — and any [[Commodore 64]] built on the '''250469 "short board"''' — restores stable supply rails and removes a common source of audio and video noise. | ||
'''Every value on this page is taken from Commodore's own parts list''' for PCB assembly 250469-01 in the [[Commodore C64 Service Manual|C64 / C64C Service Manual]] (March 1992).<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore | '''Every value on this page is taken from Commodore's own parts list''' for PCB assembly 250469-01 in the [[Commodore C64 Service Manual|C64 / C64C Service Manual]] (March 1992).<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore 64 / 64C Service Manual]]. Parts list for PCB assembly 250469-01 (C64-E), giving capacitance, voltage rating, package and Commodore part number for every capacitor on the short board.</ref> | ||
== ⚠️ A correction, and an important one == | == ⚠️ A correction, and an important one == | ||
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An earlier version of this page listed the short board's electrolytics as '''C88 2200 µF, C89 1000 µF, C90 330 µF''' with C91 "not fitted". | An earlier version of this page listed the short board's electrolytics as '''C88 2200 µF, C89 1000 µF, C90 330 µF''' with C91 "not fitted". | ||
'''Those designators are not electrolytic capacitors on this board at all.''' In Commodore's parts list for 250469-01, '''C86–C88 are 220 pF ceramics''' and '''C90 is a 470 pF ceramic'''.<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore | '''Those designators are not electrolytic capacitors on this board at all.''' In Commodore's parts list for 250469-01, '''C86–C88 are 220 pF ceramics''' and '''C90 is a 470 pF ceramic'''.<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore 64 / 64C Service Manual]]. Parts list for PCB assembly 250469-01 (C64-E), giving capacitance, voltage rating, package and Commodore part number for every capacitor on the short board.</ref> The old page appears to have carried the long-board designators across to the short board and attached invented values to them. | ||
The short board uses a completely different numbering scheme from the long boards. '''If you worked from this page before September 2026, check what you fitted and where.''' | The short board uses a completely different numbering scheme from the long boards. '''If you worked from this page before September 2026, check what you fitted and where.''' | ||
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|+'''250469-01 (C64-E / 64C) electrolytics'''<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore | |+'''250469-01 (C64-E / 64C) electrolytics'''<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore 64 / 64C Service Manual]]. Parts list for PCB assembly 250469-01 (C64-E), giving capacitance, voltage rating, package and Commodore part number for every capacitor on the short board.</ref> | ||
! Ref !! Value !! Rating !! Package !! Commodore part no. | ! Ref !! Value !! Rating !! Package !! Commodore part no. | ||
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'''Note on C63.''' Commodore's printed parts list for this assembly contains '''two entries for C63''' — 1000 µF 16 V (900101-52) and 2200 µF 16 V (900101-33).<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore | '''Note on C63.''' Commodore's printed parts list for this assembly contains '''two entries for C63''' — 1000 µF 16 V (900101-52) and 2200 µF 16 V (900101-33).<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore 64 / 64C Service Manual]]. Parts list for PCB assembly 250469-01 (C64-E), giving capacitance, voltage rating, package and Commodore part number for every capacitor on the short board.</ref> This wiki has not been able to determine whether that reflects a running change or an error in the manual. '''Read the value off your own board and fit like for like'''; either part is physically and electrically reasonable in that position, and the higher value will not do harm. | ||
== What is not an electrolytic on this board == | == What is not an electrolytic on this board == | ||
Worth stating plainly, because the previous version of this page got it wrong:<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore | Worth stating plainly, because the previous version of this page got it wrong:<ref name="sm">Commodore Business Machines, ''C64 / C64C Service Manual'', March 1992, hosted at [[Commodore 64 / 64C Service Manual]]. Parts list for PCB assembly 250469-01 (C64-E), giving capacitance, voltage rating, package and Commodore part number for every capacitor on the short board.</ref> | ||
{| class="wikitable styled-table" style="width:80%; text-align:left;" | {| class="wikitable styled-table" style="width:80%; text-align:left;" | ||
Revision as of 22:01, 21 September 2026
Recapping a Commodore 64C — and any Commodore 64 built on the 250469 "short board" — restores stable supply rails and removes a common source of audio and video noise.
Every value on this page is taken from Commodore's own parts list for PCB assembly 250469-01 in the C64 / C64C Service Manual (March 1992).[1]
⚠️ A correction, and an important one
An earlier version of this page listed the short board's electrolytics as C88 2200 µF, C89 1000 µF, C90 330 µF with C91 "not fitted".
Those designators are not electrolytic capacitors on this board at all. In Commodore's parts list for 250469-01, C86–C88 are 220 pF ceramics and C90 is a 470 pF ceramic.[1] The old page appears to have carried the long-board designators across to the short board and attached invented values to them.
The short board uses a completely different numbering scheme from the long boards. If you worked from this page before September 2026, check what you fitted and where.
Which board is this?
The 250469 short board is the one used in the C64C slim case, and in late "bread bin" machines. The assembly number is silkscreened on the board. For the earlier long boards — 326298, 250407, 250425 and 250466 — see Commodore 64 Capacitor Replacement Guide, which lists a different and non-overlapping set of parts.
Electrolytic capacitors — 250469-01
| Ref | Value | Rating | Package | Commodore part no. |
|---|---|---|---|---|
| C63 | 1000 µF | 16 V | Axial | 900101-52 |
| C63 (second entry — see note) | 2200 µF | 16 V | Axial | 900101-33 |
| C66 | 470 µF | 35 V | Radial | 900301-35 |
| C43 | 220 µF | 16 V | Radial | 900100-18 |
| C65 | 220 µF | 25 V | Radial | 900100-03 |
| C58 | 100 µF | 16 V | Radial | 900100-40 |
| C36 | 47 µF | 16 V | Radial | 900100-33 |
| C44 | 22 µF | 50 V | Radial | 251079-06 |
| C77 | 10 µF | 25 V | Radial | 900100-01 |
| C59 | 4.7 µF | 25 V | Radial | 900100-11 |
Note on C63. Commodore's printed parts list for this assembly contains two entries for C63 — 1000 µF 16 V (900101-52) and 2200 µF 16 V (900101-33).[1] This wiki has not been able to determine whether that reflects a running change or an error in the manual. Read the value off your own board and fit like for like; either part is physically and electrically reasonable in that position, and the higher value will not do harm.
What is not an electrolytic on this board
Worth stating plainly, because the previous version of this page got it wrong:[1]
| Ref | What it actually is |
|---|---|
| C2–C4, C6, C76, C90 | Ceramic, 470 pF 50 V |
| C74 | Ceramic, 1000 pF 50 V |
| C80, C81 | Ceramic, 1800 pF 50 V / 2200 pF 25 V depending on the list |
| C86–C88 | Ceramic, 220 pF 50 V |
| C94 | Ceramic, 150 pF 50 V |
| C70, C71 | Ceramic, 22000 pF |
| C1, C7, C28–C30 | Ceramic, 0.1 µF 25 V |
Ceramics of this type do not age the way aluminium electrolytics do and are not part of a routine recap.
Before you start
- Work from your own board's silkscreen. The assembly number tells you which list applies; the board itself is the final authority.
- Anti-static precautions throughout. The 8500, 8565/8562 VIC-II, 8580 SID and the Super PLA are the parts you cannot casually replace.
- See Capacitor Failure Symptoms for recognising a failed part and Recommended Tools for the workshop kit.
Related pages
- Commodore 64C · Commodore 64C General Maintenance · Commodore 64 · Commodore 64 Capacitor Replacement Guide
- Commodore C64 Service Manual — the source for every value on this page
- Capacitor Failure Symptoms · Recommended Tools