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Restoration & Repair a Commodore Dual Disk 8250 LP

Restoring & Repair a Commodore Dual Disk 8250 LP

The conditions of this Commodore Dual Disk 8250 LP are really bad. The CBM 8250 LP is left for over 25 years in a dovecote.

The cleaning, repairing and restoration have taken a long time, but the result is more than acceptable.

The comparison (before / after):

Defects:

  • Floppy Disk Drive completely dead.
  • Main motherboard failure: Status LED green but with the Floppy Disk Drive LEDs (red) that blink 3 times and then repeat in loop.
  • Directory displayed with extra chars.

Repair:

  • Replaced all the electrolytic capacitors of the two Floppy Disk Drive.
  • Replaced the IC RIOT MOS 901869-01 (Memory, I / O, Timer array)
  • Replaced the IC RIOT MOS 6532 (RAM-I/O-Timer)

Gallery of repair and cleaning:

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