Atari Centipede Cocktail table game has no power

Arcade Collecting > Restorations & repair

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bperkins01:
I would disconnect the interlock switche harness completely and put it back in bypass.
On the 7A fuse side of the primary transformer - there is nothing except what I outlined earlier.
Plug in a fuse and see if it blows..with nothing attached and in bypass.

You are down to the EFI Filter (which should never die) or a bad primary winding.
So hard to diagnose this way...

vapuser:
Well, I have everything disconnected from the brick and it's in bypass mode. I replaced the two blown fuses with new 7 amp slow blow fuses and plugged in the unit. The fuses did not blow. So happy for that. So I totally disconnected the interlock switch and also the bottom on/off switch. I checked both switches with an ohm meter and they appear to be both working correctly. Continuity when on and no continuity when off. I also checked the switches for cross continuity across the polls. No chance of shorting there as well. So how can this unit be shorting out when the wires are connected to the switches? What are we missing?

bperkins01:
If you connect JUST the interlock connector to J2 and power it up, does it blow a fuse?
then if you push/pull either of the interlock switches - does it blow?
If so - that is where the issue is...

The interlock switches are DPDT - I would think its *possible* for one of them to cross short in one of the three positions (momentary on/off/pull on)

You have 9 permutations with them

Switch 1 Switch 2
push on push on
push on off
push on pull on

off push on
off off
off pull on

pull on push on
pull on off
pull on pull on

The interlock switches turn off/on the hot and the neutral at the same time..
Like I said - hard to *see* how you are checking..
But it still sounds like one of those two switches is bad based on the fuse not blowing with them disconnected.
That said -
You could keep the interlock on bypass, plug in the ATRII and see if you get all your voltages, then plug in the PCB.
You will be fine with the 6A fuse

bperkins01:
ok - clearly I like a good puzzle.. My description above is for 2 interlock switches (for the upright)
But I think you only have a single interlock switch (I keep looking at my schematic)
This is yours - correct?

With both switches on - you should have continuity on the black wire only (pin 1 & pin 4)
and the white wire only (Pin 2 and pin 5)

You should never have continuity white to black, or white to ground (Pin 6) or black to ground
Hopefully that makes sense.

You are saying you are blowing 2 fuses every time? F1 is the 7A - what fuse is the second 7A fuse?

Mike A:
Bperkins.
Look at the pic in reply 131.

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