Zinfer
Well-known member
Asteroids plays blind. Spot killer LED lit. Blows 2amp F700 fuse. F600 is always fine. Ran a cap kit. Replaced all chassis mounted transistors and laid plenty of heat sink compound and mica's. I checked all Transistors before throwing the monitor back in, no continuity to the frame. After plugging in, turning on, blew F700 fuse, Spot killer lamp lights. I double check the chassis transistors and both 2N3716's show continuity to monitor frame while the 2N3792's do not. Oscope X and Y out giving good signals from PCB. Appears fine and game is in attract mode.
Unplugged edge connector leading to main harness. Transistors no longer show as shorted to the monitor chassis.
Why would 2n3716's show isolation from frame, then when monitor plugged in, they show continuity? I'm thinking it's a deflection board through hole transistor. I've looked at 608 and 708 diodes. Nothing appears blown or shorted. If I leave it plugged in too long it'll blow the F700 fuse again. (3rd 2amp fuse).
Unplugged edge connector leading to main harness. Transistors no longer show as shorted to the monitor chassis.
Why would 2n3716's show isolation from frame, then when monitor plugged in, they show continuity? I'm thinking it's a deflection board through hole transistor. I've looked at 608 and 708 diodes. Nothing appears blown or shorted. If I leave it plugged in too long it'll blow the F700 fuse again. (3rd 2amp fuse).