Hey everyone, no images just yet of the device. Wanted to ask if anyone has experience with this preamp ? It's intermittent something by the the main IC or the IC itself is faulty. IC 302 on the schematic, if you freeze near this area the amp works. So far I've done the following:
Soldered cpu to board-removed 40 pin socket
Replaced 4mhz clock
Replaced all caps
Cpu has clean 5v
Caps near cpu are ok
Resistors and resistor pack test ok
All other voltages are there and working
Two small ZTX750 transistors near by I have on order, they test ok on the meters and have 6.8v on each stable, I'm trying them anyway.
Anything is appreciated, here's the data sheet. Will grab images shortly.
https://cdn.badcaps-static.com/pdfs/...54722fffc3.pdf
Soldered cpu to board-removed 40 pin socket
Replaced 4mhz clock
Replaced all caps
Cpu has clean 5v
Caps near cpu are ok
Resistors and resistor pack test ok
All other voltages are there and working
Two small ZTX750 transistors near by I have on order, they test ok on the meters and have 6.8v on each stable, I'm trying them anyway.
Anything is appreciated, here's the data sheet. Will grab images shortly.
https://cdn.badcaps-static.com/pdfs/...54722fffc3.pdf
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