Game had power, now, nothing!

Smart Bomb

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It just keeps getting worse and worse over here....im trouble shooting 2 ms pac boards right now and im testing them in a stand up cab which was completely working....well i put one of the boards into the game to test the board and now the game doesn't come on at all....all fuses are good on the brick..I have 120 ac going into the game at the connector to the power supply...and also going to the on/off security switch......i dont have 5+ going to the board...no power to monitor chassis..no marquee light...nothing!!!...the cab is literally dead for no apparent reason.

What do i test on the brick to see if its dead? Im thinking the power supply died on me out of the blue.
 
You should jump the door switch or pull the nob and test for voltage coming off the other side of the switch. No power to the marquee of monitor sounds like a switch or a fuse.
 
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those cabinets have safety interlock switches on the back door. I mostly dealt with games that abolished those, so I got particularly weirded out working on a "dead" Galaxian before I realized I didn't pull the switch out. :p

for the sake of explanation, there's 2 transformers and each has their own fuse block. the transformer to the left is the basic 120V isolation transformer for the main cabinet and monitor power with 2 fuses: one fuse is the line fuse (the main one) and the other is for the monitor. the transformer to the right has the multiple AC taps to feed the game board with +7 and +14 VAC (which are rectified and regulated at the game board down to +5 and +12 VDC respectively) which has a 4 fuse block with 2 fuses each for +7 and +14 VAC.

if the game worked and magically doesn't now, I would check to make sure the safety switch is pulled out to its NC position. how you tested boards all the other times successfully with overlooking this is anyone's guess. but anything's possible.
 
my mistake. I thought the transformers went left to right. the fuse holders are correct in my head though.
 
those cabinets have safety interlock switches on the back door. I mostly dealt with games that abolished those, so I got particularly weirded out working on a "dead" Galaxian before I realized I didn't pull the switch out. :p

for the sake of explanation, there's 2 transformers and each has their own fuse block. the transformer to the left is the basic 120V isolation transformer for the main cabinet and monitor power with 2 fuses: one fuse is the line fuse (the main one) and the other is for the monitor. the transformer to the right has the multiple AC taps to feed the game board with +7 and +14 VAC (which are rectified and regulated at the game board down to +5 and +12 VDC respectively) which has a 4 fuse block with 2 fuses each for +7 and +14 VAC.

if the game worked and magically doesn't now, I would check to make sure the safety switch is pulled out to its NC position. how you tested boards all the other times successfully with overlooking this is anyone's guess. but anything's possible.

The switch is definitely pulled out...i even pushed it in and held it....ive been testing these two boards...i put the board in, pull switch...test board....ive done this multiple times...this last time nothing came in.
 
If your interlock/door switch is working and sending power to the marquee, you should have light. There is a molex connector that you can disconnect and test for voltage. You can have a bad PCB, blown monitor chassis and still have a lit marquee if there is power. That's why I'm hung up on the light.
 
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