Atari Centipede Cocktail table game has no power

Arcade Collecting > Restorations & repair

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bperkins01:
OOOhhhhhhh - is it F2 and F3 that are blowing.
ughh - my mistake - can I delete my last 2 posts? :embarassed:

I don't have the rest of that to look at.. That power brick is different than the upright..
I was looking at the 7A fuse in the primary side.

Mike A:
I will email you a good quality pic.

bperkins01:
Looks like its the 10.3v circuit.

When you connect just the power brick (including the switches) nothing blows.. correct?

My guess is when you connect the ARII - that's when they blow. (don't connect the PCB)
The 10.3v circuit has a bunch of chips in it that could cause a short.
Right in the middle of all of them is the LM305 voltage regulator chip you ordered with the power transistor.
Its a known troublemaker... Did you replace it? if not.....

(again - so hard to do over a forum....)

vapuser:
Good morning all. I've been up since 5:00 this morning trying to figure this crazy problem out. I really never thought that the switches where causing the problem. So just to confirm that, I removed both of them from the equation and put a jumper across the two black wires and across the two white wires for the interlock switch. And Also did the same for the on/off switch at the bottom of the chassis. I also plugged in J2 to the chassis. Nothing else is plugged in. The PCB is disconnected as well as the ARII and as well as the monitor. And yes to the question are they both 7 amp fuses. F2 and F3 are both 7 amp fuses. As soon as I plugged the cord into the wall socket, both of the 7 amp fuses at F2 and F3 blow. To answer your question, "When you connect just the power brick (including the switches) nothing blows.. correct?" Now that I have those switches hard wired, the fuses will blow If I plug in J2. If I unplug J2 and put jumpers across the J2 socket on the brick, nothing blows. Which makes sense, there's no voltage being distributed to the harness and through the switches. Oh, and Yes, I did replace both of those parts yesterday. I thought I mentioned that above. Sorry. I guess we're back to square one. Where is this short coming from? Back to the schematic.:dizzy:

bperkins01:

--- Quote from: vapuser on February 16, 2020, 09:20:33 am ---Good morning all. I've been up since 5:00 this morning trying to figure this crazy problem out. I really never thought that the switches where causing the problem. So just to confirm that, I removed both of them from the equation and put a jumper across the two black wires and across the two white wires for the interlock switch. And Also did the same for the on/off switch at the bottom of the chassis. I also plugged in J2 to the chassis. Nothing else is plugged in. The PCB is disconnected as well as the ARII and as well as the monitor. And yes to the question are they both 7 amp fuses. F2 and F3 are both 7 amp fuses. As soon as I plugged the cord into the wall socket, both of the 7 amp fuses at F2 and F3 blow. To answer your question, "When you connect just the power brick (including the switches) nothing blows.. correct?" Now that I have those switches hard wired, the fuses will blow If I plug in J2. If I unplug J2 and put jumpers across the J2 socket on the brick, nothing blows. Which makes sense, there's no voltage being distributed to the harness and through the switches. Oh, and Yes, I did replace both of those parts yesterday. I thought I mentioned that above. Sorry. I guess we're back to square one. Where is this short coming from? Back to the schematic.:dizzy:

--- End quote ---

Let me see if I can repeat this back: (Just to be sure)
1. You bypassed the interlock switch and the on/off switch with jumpers on the actual wiring harness (testing for bad switches), left it plugged into J2 on the power brick and the fuses blow. (yes/no?)
2. You unplug J2 from P2 on the power brick, Jump pins 1 & 4 (black) and 2 & 5 (white) on P2 (on the power brick) and the fuses do not blow?

But after that -
The only thing there is the bridge rectifier and the big blue cap - recheck the wires on them? Maybe one got to the wrong place?
Maybe you got a bad rectifier? With power and nothing connected to J5 - that's all there is connected to those 2 fuses.

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