Super Nova
Game Plan, 1980The machine fails to start and I am seeing the following. At the rectifier test points, the voltages are TP1=13.4vdc, TP2=4.9vdc, TP3=6.2vdc, TP4=28.1vdc.
The reference voltages I found online are, TP1=12-14vdc, TP2=5vdc, TP3=7vdc, TP4=24vdc.
The MPU blinks 4 times upon powering up.
As others have stated, the pin connectors have a tendency to corrode. I therefore re-pinned many of the connectors and placed new Molex plugs.
Next step in troubleshooting?
Many thanks.
Quoted from Playdium:The MPU blinks 4 times upon powering up.
Since you're only getting 4 MPU LED flashes on power up (there should be 6 flashes for a successful boot), the board is failing at the 5th power on test.
In the link Atari_Daze posted above:
"MPU LED Flash 5.
The fifth MPU LED flash indicates the I/O is good, which is handled by the Peripheral Interface Adaptor (PIA) chip. If there is no 5th flash, replace the U17 (8255 PIA) chip. Could also be the I/O chip select gate at U4 (74LS00)."
Quoted from Playdium:Issue resolved by replacing a bad chip on the MPU. Running fine now.
Can you tell us which chip was faulty for future reference? May help someone with the same issue down the track.
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Barnstable, MA