Arcade Collecting > Pinball
The Shadow
ChadTower:
Spending some time reading up on the DMD HV circuit here. A schematic of the circuit is here.
ChadTower:
AHA. Checking the voltages at the DMD's power connector, I find the following:
Pin 1: Should be between -110v and -130v, is -113.8v ON THE LOW END
Pin 2: Should be between -98v and -118v, is -86.8v TOO LOW
Pin 3: key
Pin 4: ground
Pin 5: ground
Pin 6: Should be between +4.9v and +5.2v, is +5.04v
Pin 7: Should be between +10v and +14v, is +11.63v
Pin 8: Should be between +58v and +68v, is +1.6v ABSENT!
Later on tonight I'll look into where the +68v is supposed to come from.
ChadTower:
Hrm... it's blowing F601. Need to figure that out first... will probably clear this up.
EDIT: Confirmed, F601 is the +62v circuit.
ChadTower:
Good thread on bridge rectifier testing.
ChadTower:
Both bridges test acceptably without load... looking for a local source for extras now just in case.
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