I found a short on my 7 Pin DIN power connector, which was clearly the culprit for the issue with the 5v rail.
Once that was cleaned up, almost all of the 5v source voltages are testing correctly now.
The key exception is the VICII circuit, which for some reason reads 9v everywhere a 5v source voltage should be?
BTW - I've triple-confirmed that JP3 is definitely set for 5v VIC...
Irrespective, what could be causing all of the source voltages on U29-U32 to hit 9v, instead of 5v?
New voltage readings:
TP1 12.01 VDC
TP2 8.75 VDC
TP3 8.73 VDC
TP4 8.9 VDC
TP5 GND
TP6 5.20 VDC
TP7 6.17 VAC
TP8 6.08 VAC
VIC Pin 40 9 VDC
SID Pin 28 9 VDC
RF Mod 12 VDC
Once that was cleaned up, almost all of the 5v source voltages are testing correctly now.
The key exception is the VICII circuit, which for some reason reads 9v everywhere a 5v source voltage should be?
BTW - I've triple-confirmed that JP3 is definitely set for 5v VIC...
Irrespective, what could be causing all of the source voltages on U29-U32 to hit 9v, instead of 5v?
New voltage readings:
TP1 12.01 VDC
TP2 8.75 VDC
TP3 8.73 VDC
TP4 8.9 VDC
TP5 GND
TP6 5.20 VDC
TP7 6.17 VAC
TP8 6.08 VAC
VIC Pin 40 9 VDC
SID Pin 28 9 VDC
RF Mod 12 VDC