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Archive for January 6th, 2014

Repaired for a friend a Commodore CBM 8296-D Motherboard

January 6th, 2014 No comments

This is a Commodore CBM 8296-D Motherboard repaired for a Friend.

Gallery of the repair:

Defect:

  • Black screen of death without startup beep and after replacing U5 and U6 black screen of death with startup beep.

Replaced parts:

  • Replaced PLA U5 with a original PLA MOS 324745-01.
  • Replaced PLA U6 with a OTP EPROM 27C512R 70ns + Adapter
  • Replaced a dual FlipFlop 74LS74 UD4.

* The replacement of the two PLA has already been made earlier by my friend.

Categories: Commodore CBM/PET family, Gallery, Projects / Repairs, Retro Computers and other stuff..., Today, Various

Restoration & Repair of a Commodore 8032-SK (Gold Label)

January 6th, 2014 1 comment
Commodore 8032-SK (Gold Label)

The conditions of this Commodore 8032-SK (Gold Label) are really bad. The CBM 8032-SK is left for over 25 years in a dovecote.

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

The comparison (before / after):

Defects:

  • The Commodore 8032-SK was completely dead (Black screen of death).
  • Little problems of CRT geometry.

Repair:

  • Replaced the CPU 6502.
  • Yoke calibration of the CRT

Gallery of repair and cleaning:

Categories: Commodore CBM/PET family, Gallery, Projects / Repairs, Retro Computers and other stuff..., Today, Various