Commodore 64 s/n U.K.B1309074 Repair Log (Work In Progress)

Do you have a defective / non working Commodore 64 breadbin?
I probably want it!
Make me an offer on gert@dabbler.dk and state if you want to sell it or swap it for this working one (you will have to pay my costs in parts and shipping – but not my time) 🙂

 

Purchased 18th August 2017 on eBay:

  • Breadbin: SER.NO.U.K.B1309074
  • PSU: Part No. 310200-04
  • Datasette: C2N, Serial No 2871008, Made in Taiwan
  • Joystick: Spectravideo, model 318-102
  • Original Commodore 64 MicroComputer User Manual, 1984, Printed in England
  • The Commodore 64 Games Book – 21 Sensational Games by Oweb Bishop, 1983, Printed in Great Britain
  • Motherboard: S/N 057894, assy No. 250425, Made in Hong Kong

 

Chips:

  • U1: CIA, MOS 6526, week 31, 1984
  • U2: CIA, MOS 6526, week 31, 1984
  • U3: BASIC ROM, MOS 901226-01, week 28, 1984
  • U4: Kernal ROM, MOS 901227-03, 1983 (no week)
  • U5: Character ROM, MOS 901225-01, week 33, 1984
  • U6: Color RAM, MM2114N, week 24, 1984
  • U7: CPU, MOS 6510, week 31, 1984
  • U17: PLA, MOS 906114-01, week 27, 1984
  • U18: SID, MOS 6581, week 28, 1984
  • U19, VIC2, MOS 6569R2, week 35, 1984. Defective replaced by TDB
  • U31, MOS 8701, week 34, 1984. Defective replaced by TDB
  • RAM, 8*NEC D4164-2

 

Sellers description:

Good Commodore 64 personal computer, tape player, 1 joystick, leads + power pack.
The power pack overheated at one stage but still worked – hence the tape around it.
I have not tested to see if the power pack will still work but I would say it was much safer to use an alternative power pack!
The Commodore has not recently been tested but was working when last used and has been well looked after so I do not see there would be any problems with it.
No original packaging.

 

Repair log:

  • Black screen of Death. No clock on MOS 8701. Replaced
  • Grey screen of Death (blue border). VIC2 defective. Replaced.
  • Glued datasette connector (broken plastic). Ground wire torn – hidden in connector (rarely used anyway).
  • Trashed PSU as it is non-repairable (covered in un-removable epoxy). Salvaged wire/connector for Commodore 64
  • Re-capped motherboard
  • Cleaned and lubricated datasette
  • Changed both drive belts in datasette

 

Work in progress:

  • Heatsinking larger MOS chips
  • Put week+year of new 8701 and VIC2 in here 🙂
  • Overvoltage protection on motherboard (P6KE6.8CA)
  • Re-capping datasette
  • Build new PSU
  • Clean/test joystick

 

Costs (total DKK 1.000):

  • Breadbin, joystick, books and datasette: DKK 500.-
  • MOS 8701: DKK 100,-
  • VIC2: DKK 175,-
  • PSU (transformator): DKK 125,-
  • Misc.: DKK 100,-

Let me know if you will buy it for my costs when it is done 🙂

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