Arcade Collecting > Pinball

VND acting up

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LLUncoolJ:
Did all the loosening and tightening. Turned it on and it immediately reset...several times. The first time I noticed was after it was turned on, as soon as the backbox light licked on, it would reset. This thing seems to work according to the weather. :banghead:

lilshawn:
sounds likely the bridge might be getting wore out.

sometimes the bridge will work okay, but a small dip or surge in power will cause one of the diodes in the bridge to short or go open, causing the 5 volts to go wacky for a second...causing the reset watchdog to trip and reboot the machine.

i believe indeed that the bridge for the 5 volt is "BRDG21" possibly "C203" as well but do the bridge first.

the bridge item number is "DB3501" "35 amp silicon bridge rectifier. you will have to check and make sure that it has terminals not wires, as it often comes in both styles.

LLUncoolJ:
Thanks lilshawn, that's kinda what I am leaning toward. I want to pull the board and take a look and see if replacing these is in my skillset. I'm not a very experienced solderer.

lilshawn:
the easy way is to use a pair of cutters and nip off the bridge. that way you will have an easier time removing the stumps one at a time than trying to get them all at the same time. heat the nub up not the circuit board or you will wreck the trace (the copper conductor attached to the board).

clean out the holes using soldering braid (available where you buy soldering irons and solder) or a "solder sucker" in a pinch i've used a straw to clean out the holes. BLOWING not sucking!!

align the new bridge (it has tabs turned every which way...the bridge will only go in one way.)

heat up the leg and touch the solder to it, once you have enough the solder will flow down sticking to the leg in the process... then stick to the actual circuit board trace. doing it this way will ensure that the solder has stuck to the leg which is thicker metal and harder to heat up. otherwise what happens is what's known as a cold solder joint, and the solder is stuck to the trace but actually forms a pool of flux around the leg, making no (or very poor) connection.

shardian:
Regarding the pin repair parent.

If he maintained route pins... DON'T LET HIM TOUCH YOUR GAMES!!!!!!

If he is a hobbyist who cares deeply for his games, then let him help.

All it takes is bringing an 'operator maintained' pin back to health to know that not everyone who's ever worked on a pin actually knows what they are doing.

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