Weird problem on my Gottlieb System 1 power board. The previous owner had changed the filter cap but didnt do much else in the way of preventative maintence, so I did everything outlined on Pinrepair. Power supply seemed to be working befor my rebuild but I hadnt tested 4v/8v, displays were dim before my rebuild. On first go after rebuild I could hear sparking and saw little bit of smoke. I think this was caused by 2 bad solder joints I made. Fixed that.
Low 4v and 8v, might be affecting displays, all displays are dim. Both measure about 1vdc at A2p2 male pins. -12v, 5v, 60v and 42v are good at A2p2 male pins. Measuring A2-P1 connector, black lead on gnd and red lead on pin 1,2,4,5 all measured correct AC voltage as listed in schema. Measuring pin 6,7 this way gave me half of what was expected, putting black lead on 6 and red lead on 7 gave me proper 69vac.
8v components (replaced by me already):
R21 100ohm 1/2 watt
Cr1/cr2 1n5401 3a 100v (should be upgraded?)
Im going to pull the board back off and check all these components. Any other suggestions?