Grbgemen
Active member
I picked up a JP awhile back that had a few burnt connectors and cold solder joints.
After fixing the above, played a few games and it quit half way through the 5th game. Found one of the 7 amp SB fuses was blown. Replaced it and got a really loud buzz on power up. Checked other 7 amp and it was also blown. Replaced that and game booted but first 7 amp quickly blew and the other 7 amp got orange hot.
Next I unplugged all the connectors off the psu except the power coming in and tested the 3 test points at the top.
+5 was low around 4.5v
+12 unreg was around 13
-12 unreg was around 1.5
Now just as I pulled my head away to shut the machine off, a cap exploded(will have to check location). 1000uf 25v. Replaced it but still blowing 7 amp fuses.
Didnt really find a whole lot on DE powersupply repair.
After fixing the above, played a few games and it quit half way through the 5th game. Found one of the 7 amp SB fuses was blown. Replaced it and got a really loud buzz on power up. Checked other 7 amp and it was also blown. Replaced that and game booted but first 7 amp quickly blew and the other 7 amp got orange hot.
Next I unplugged all the connectors off the psu except the power coming in and tested the 3 test points at the top.
+5 was low around 4.5v
+12 unreg was around 13
-12 unreg was around 1.5
Now just as I pulled my head away to shut the machine off, a cap exploded(will have to check location). 1000uf 25v. Replaced it but still blowing 7 amp fuses.
Didnt really find a whole lot on DE powersupply repair.