Amiga 600 which didn’t boot. Did some measurements on the 555 timer ic’s, and I saw the trigger threshold was too low, 1,2 Volt. It should be some where around 2,4V. So I guessed the problem should be R611 or C611. Removed both, R611 was good, however C611 was acting like resistor of around 45K […]
Month: March 2019
A600 – Monochrome signal on composite
Amiga 600 came in for repair and recap. Beside the recap this the machine had a problem with the composite video signal, it was monochrome. Problem: bandpass filter Z221 was broke. That bandpass filter (and also delaylines) are not for sale anymore, so you got 2 options to replace this. Get one from a scrap […]
C64 Reloaded – IEC not working
The owner of this board tried to install an internal sd2iec adaptor on the internal IEC header. IEC not working anymore.. Let have a closer look.. First I removed the solder and wires parts from CN4B, then I removed the silkscreen from the board to see the damage. Some vias are messed up, and […]
Don’t use THT caps on SMD pads!!
This is a good example why you shouldn’t use THT Capacitors on SMD pads.