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Museum of the Game® & International Arcade Museum® Forums
Hi everyone. Getting 4.22v on my TTL chips. I was at 1.8v so I'm improving and I at least get video output now. Lots of fried parts that had to be replaced. And now I'm stuck.
Test rig is using switcher and jamma adapter.
Here's what I did.:
First I repaired the edge connector it was burnt badly.
Cap kit on entire board 10Ku caps were not in spec
Replaced both r52 and r53 (r53 was out of spec)
Replaced voltage regulator IR1
Replaced dmv44 with Tip31c it was shorted
I get 5.02v at c3 and c4
Tip31c e=4.22v b=5.02v c=5.02v
D8=5.13v
D9=5.13v
D6=5.11v
D3=11.56v banded side
D4=11.56v banded side
C29=11.59v
C51=5.84v
C10=4.99v
C5=9.33v
C6=4.99v
C7=5.08v
C8=5.08v
D1=.01v
D9=4.23v
Voltage regulator
Pin1=4.23v
Pin2=5.0v
Pin3=9.33v
Pin4=.01v
Not sure why the emitter is only 4.22v ? I have another I could replace it? C5 is curious to me to thought that would be 12v?
Anyone have any ideas? I have been out of video games for 23 years. Trying to refresh my skills.
D3 bad?