whatchitfoool
New member
Galaga upright video pcb problem (g07 cbo fixed)
so, im working on a midway galaga full upright. this is a friends he just got, so its his dime and at his house. ive got a monitor problem (besides the small character issue [that maybe ill ask about later if i cant figure out] ).
its a g07 cbo. ive work on a few of these before, never had to much trouble. DOA, so i put in a new flyback, hot, reg, and HW coil. + about 1/2 the elc caps, as acouple near the HW coil were visibly bad upon inspection. (had the stuff around, or id of just done all the caps). tried it again, heard it wind up - and nothing. turn it off, hear it wind again and dead. (so the HV was turning on before it went into shut down).
i pull x701, and sure enough it comes on. with b1 around 155 and b3 around 158.
so i start looking over everything in the 900s. replaced:
x04 (gagin)
x501
ic 501
x901
x902
r909 (2k pot)
r 908 (47k)
c905 (again)
pulled a leg and checked:
r903 (4.7 ohm 3W)
r904 (10k 2W)
r910 (2.476k)
FR 901 (220 ohm)
907 (33k)
r01 (220, 25W big fat white one)
? cant remember...(the other large 7W resistor on the PCB under the 25Wer)
looked at all the ceramic, no shorts
no cracks or solder bridges, everything seems to have a path to where and only where it should.
still into Hv shutdown, works (poorly) with x701 pulled.
looked and tested all over the 900s at least twice, but above is only what i can 100% remember i did.
anyone have any help to offer?
so, im working on a midway galaga full upright. this is a friends he just got, so its his dime and at his house. ive got a monitor problem (besides the small character issue [that maybe ill ask about later if i cant figure out] ).
its a g07 cbo. ive work on a few of these before, never had to much trouble. DOA, so i put in a new flyback, hot, reg, and HW coil. + about 1/2 the elc caps, as acouple near the HW coil were visibly bad upon inspection. (had the stuff around, or id of just done all the caps). tried it again, heard it wind up - and nothing. turn it off, hear it wind again and dead. (so the HV was turning on before it went into shut down).
i pull x701, and sure enough it comes on. with b1 around 155 and b3 around 158.
so i start looking over everything in the 900s. replaced:
x04 (gagin)
x501
ic 501
x901
x902
r909 (2k pot)
r 908 (47k)
c905 (again)
pulled a leg and checked:
r903 (4.7 ohm 3W)
r904 (10k 2W)
r910 (2.476k)
FR 901 (220 ohm)
907 (33k)
r01 (220, 25W big fat white one)
? cant remember...(the other large 7W resistor on the PCB under the 25Wer)
looked at all the ceramic, no shorts
no cracks or solder bridges, everything seems to have a path to where and only where it should.
still into Hv shutdown, works (poorly) with x701 pulled.
looked and tested all over the 900s at least twice, but above is only what i can 100% remember i did.
anyone have any help to offer?
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