Looking for 1966 Bally Capersville, 1967 Bally The Wiggler, 1981 Stern Viper, 1986 Pinstar Gamatron, 1986 Williams Grand Lizard, 1991 Williams Bride of Pinbot, and a few others. Cash or some trades available. Could also repair a machine of yours +/-$ if needed, in exchange for one machine on my want list, non-working/unshopped welcome!
Maybe my eyes are playing me tricks (should have gone to bed 2 hrs ago but does it has a wire into the varistor?? The same wire going in the back?
EDIT: Past the last minutes looking at the pictures again, and it's really time I go to bed, I'm hallucinating thing!!! Sorry!
My vote goes with cooke for the wire in the back.
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Working on: Gorgar, Tri-Zone, Agent 777 Next project: F14- Tomcat, Taxi, Strange World, Genesis
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Stripped wire at the bottom? Gold plated fuse clips? Is that a middle bridge not touching the bottom plate heatsink?
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It's gotta be the gold plated fuse clips, or is it the bridge rectifier not touching the heatsink?
Have
Want
-The Getaway: High Speed II!! -Spider-Man -F-14 Tomcat -Guns N' Roses -Lord of the Rings -Twilight Zone
-Medieval Madness! -Indiana Jones (Williams) -Star Trek: The Next Generation -Champion Pub -Terminator 3 -Congo -Johnny Mnemonic -Tales of the Arabian Nights
Did they install a series of diodes to do the same??
Looks like they're on the back side of the PCB. The rectifier in my SMDM was like that too.
Have
Want
-The Getaway: High Speed II!! -Spider-Man -F-14 Tomcat -Guns N' Roses -Lord of the Rings -Twilight Zone
-Medieval Madness! -Indiana Jones (Williams) -Star Trek: The Next Generation -Champion Pub -Terminator 3 -Congo -Johnny Mnemonic -Tales of the Arabian Nights
Thanks for all the guesses to date. Sorry for the picture of limited quality, it did not help identifying the real problem. But some did find the actual issue !
Answer: someone had replaced BR1 and BR3 bridge rectifiers at some point, using beefier units for these sandwitched rectifiers... But leaving BR2, the middle bridge rectifier, not touching the heatsink!
This is a major mistake, as BR2, the bridge rectifier for the +5V supply, will quickly overheat and potentially short. Heat is the enemy #1 of semi-conductors. Plus, no thermal grease was used on BR1 or BR3, leaving the new bridges to also potentially overheat.
Two possible solutions: - replace BR2 with a similar beefier unit of the same thickness, and use thermal grease when reassembling. Probably the preferred solution. - if BR2 is still good, use a metal spacer along with thermal grease to connect all bridge rectifiers at an equal plane thermally to the heatsink.
I do not like Clay's method of replacing all these bridges with huge ones in the front of the rectifier board, as there is no longer a proper large heat sink available to dissipate the heat of these components. Ed at http://www.greatplainselectronics.com has good 10A replacement units for those bridges (but are thicker than the original).
...incidentally there are no issues with wiring or fuse clips in the pic; this is factory.
Cheers, - Sylvain.
Looking for 1966 Bally Capersville, 1967 Bally The Wiggler, 1981 Stern Viper, 1986 Pinstar Gamatron, 1986 Williams Grand Lizard, 1991 Williams Bride of Pinbot, and a few others. Cash or some trades available. Could also repair a machine of yours +/-$ if needed, in exchange for one machine on my want list, non-working/unshopped welcome!
1) Heaps of solder that may/may not be connecting adjacent fuse clips 2) Fuse clips that could definitely use replacing 3) BR2 seems to have fallen away from heatsink plate
I like Sylvain's endoresement of using slightly thicker and beefier BR's. I've been using those mammoth 35 amp 200V BRs and they are a pain in the _ _ _ to install. I think I will try 10 amp replacements next time.
I wrote my post before seeing 80s.fans post, so I guess we both win?
Have
Want
-The Getaway: High Speed II!! -Spider-Man -F-14 Tomcat -Guns N' Roses -Lord of the Rings -Twilight Zone
-Medieval Madness! -Indiana Jones (Williams) -Star Trek: The Next Generation -Champion Pub -Terminator 3 -Congo -Johnny Mnemonic -Tales of the Arabian Nights
sylvain
Male
websherpa
Logged
but does it has a wire into the varistor?? The same wire going in the back?
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