Repaired a Sinclair ZX-80 that has certainly seen better days
Gallery of repair and cleaning:
This computer is arrived for a repair from a friend. The defect is the classic Black Screen of Death and also the PCB has certainly seen better days.
Defects found:
- Short circuits.
- Tracks interrupted or broken.
- Tracks partially raised.
- Jumpers with flying leads.
- Some components are partially unsoldered and soldered to other components.
Repair:
- Rebuild all the tracks interrupted or partially raised.
- Arrangement of all components removed or partially unsoldered.
- Removing flying jumpers
- Replaced CPU Zilog Z80
- Replaced a RAM 2114
- Replaced a Multiplexer 74LS157
- Replaced the ZX-81 Rom with a Eprom 2532 with programmed the ZX-80 Rom.
Mod:
- Composite video output (simple version without Transistor). It was made only to make easiest the repair.
Categories: Gallery, Projects / Repairs, Retro Computers and other stuff..., Sinclair family, Today, Various
OTTIMO :)
ora ti guardo le foto e cerco i componeti per il mio progetto di costruire uno ZX80 identico 1 a 1 :)