scoots
Active member
(i made this from memory, i can't guarantee the wiring here is really correct but it should be good enough for our discussion)
so the transformer IS putting out the correct voltage (70v across the lugs).
i replaced the fuse holder and all the wiring/pins connecting fuse holder, transformer, and the 69v pins on connector A2P1 (i used the schematic, shop manual, and DMM when i did this, not my faulty memory ie i believe this wiring to be correct whether my drawing above is or not). all ground mods have been carried out. the big filter caps on the PS were replaced with beefier parts. the bottlecap transistor on the PS has been replaced (blew it trying to jumper the fuse holder, dumb).
problem(s): 1/4A fuse blows when connector A2P3 is plugged in. if connector A2P1 is unplugged, voltages on the 69V pins is only around 30V each. many diodes on PS showed a reading in both directions on diode test, but i was testing them in circuit.
everything else in the game works properly, just no displays. at first they would flicker in and out a bit but the credit display (42v) was still good. now there is no life any any of them, period.
i am a noob with no real experience trying to attack this as logically as possible but google searches aren't helping me at this point. can someone suggest a plan of action or a logical place to look for problems? i don't have any other known working parts to swap out the displays or PS etc. thanks.
so the transformer IS putting out the correct voltage (70v across the lugs).
i replaced the fuse holder and all the wiring/pins connecting fuse holder, transformer, and the 69v pins on connector A2P1 (i used the schematic, shop manual, and DMM when i did this, not my faulty memory ie i believe this wiring to be correct whether my drawing above is or not). all ground mods have been carried out. the big filter caps on the PS were replaced with beefier parts. the bottlecap transistor on the PS has been replaced (blew it trying to jumper the fuse holder, dumb).
problem(s): 1/4A fuse blows when connector A2P3 is plugged in. if connector A2P1 is unplugged, voltages on the 69V pins is only around 30V each. many diodes on PS showed a reading in both directions on diode test, but i was testing them in circuit.
everything else in the game works properly, just no displays. at first they would flicker in and out a bit but the credit display (42v) was still good. now there is no life any any of them, period.
i am a noob with no real experience trying to attack this as logically as possible but google searches aren't helping me at this point. can someone suggest a plan of action or a logical place to look for problems? i don't have any other known working parts to swap out the displays or PS etc. thanks.