So, the components arrived for the down Dot Matrix Controller board that originally came out of a Party Zone. It was missing +62VDC which causes the display to come up as completely blank.
Since Party Zone is a location game and down time is money to the owner, I sold him my working Dot Matrix Controller board out of my Fish Tales and just dealt with one down game for a few days. Believe it or not, though I do a lot of repairing, I don’t play my games that much.
With parts in hand, we look at the components that make up the +62 VDC circuit, which are the following:
Fuse F601 (this tested fine, not of concern in this repair)
Bridge Rectifier BR1 (tested fine with DMM on diode/volts test, no need to replace)
Filter Capacitor C4 (220uF, 160V)
Bleeder Resistor R12 (47ohm, 1 watt)
Resistors R3 – (47ohm, 1 watt) R4 (120ohm, 1 watt) and R11 (cement 120ohm, 5 watt)
Transistors Q2 (2N5551), Q3 (MPE15030) and Q10 (5401)
Zener Diode D3 (1N4759A)
Since our fuse and BR1 tested fine with a DMM, those were not touched. Resistor R11 tested fine in circuit with the DMM as well, so I also left it alone. The components I replaced in this repair which tend to be the most possible suspects were: Resistors R3, R4 and R12; Transistors Q2 and Q3; Zener Diode D3; and I decided to replace the Capacitor C4 since I had it on hand.
One of those components ended up being our faulty issue, as once the board was popped back in game, Fish Tales came alive.