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Williams, 1979You're currently viewing posts by Pinsider Magadovski.
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Fuse F1, worked before but with flickering displays. Maybe bad luck only with old fuse?
Is it 0,25 A = 1/4 A
Quoted from vid1900:Which amp fuse blew on the board exactly?
Did the board work before you updated it?
8D5F328D-037B-420C-AA4A-8909C1111780 (resized).jpegBA97701D-F40E-4592-BB58-0B3097F62CCA (resized).jpegvid1900 Imeesured from a leg on the caps, and + mark on the board and got about 126-127v
Quoted from Schwaggs:Those are supposed to be 39,000 (39K) resistors, not 39 ohm that it looks like you installed.
Carefully measure the display voltages that the board is putting out. It should be close to -100 and +100.
You may have overloaded the zener diodes in the display power supply but I would think the fuse would have blown before much damage was done (assuming a 0.25a fuse was installed).
Ok i got no reading at all between does pins
Quoted from Schwaggs:The fuse clip and cap voltages are before the regulator circuit and not what we need.
Measure from the voltages on J5 at the top left of the board. Pin numbers are counted from left to right when installed in the game. Be VERY careful not to touch multiple pins together when measuring or you will damage other parts of the board or at the very least blow some fuses. You are dealing with voltages that can kill you so be careful.
Between Pin 3 and ground should be -100V DC
Between pin 4 and ground should be +100V DC
ok. fuses are still good,
https://pinside.com/pinball/forum/topic/powersupply-problems-williams-system-3#post-7128108
Quoted from Schwaggs:OK, make sure the fuse is still good. If it is, we need to dig into the regular circuit some more. Please create a new thread and link it here so we can talk there and not derail the Bullet Proofing Thread any more.
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Woolwich Township, NJ