Atari Centipede Cocktail table game has no power

Arcade Collecting > Restorations & repair

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bperkins01:
Nothing better than fixing something that doesn't work - yourself. Especially if its something you enjoy.

jennifer:
Guess I really dont see it as a satisfaction thing, It is a job that needs to be done, or the alternative is sit and look at it and just dream about doing it someday...Either way not really a top shelf ego boost.

vapuser:
Good morning all once again. I feel we're getting close. As I posted yesterday, I would take pics of the backside of the PCB for Mike. Mike please see below. Also here are the test point voltages of the PCB:

Required Actual
voltage voltage
+5v 0v
+22v +24.3
-22v -24.4
-15v -14.9
_15v +15.4
-30v -27.6
-5v -5.1

Yesterday I ordered the (Q3) 2N3055 Transistor and the (Q1) 5v Linear Voltage Regulator. bperkins01, did the transistor come with the heat sink compound or a gasket? Or did you have to order those parts separately? I will definitely be installing these parts myself. I agree! Nothing better than fixing it yourself. It must be a guy thing. I watched a couple video's on the installation. One guy used a GS Silicon heat sink compound on a formica type gasket. The only kind of heat sink compound I've used was applying a CPU chip in a motherboard. I don't think the compounds are the same. Not sure. I heard that some compounds can cause a capacitance. See: https://bestthermalpaste.com/thermal-paste-vs-thermal-grease/ Any knowledge on the subject? Are the above voltages what you were expecting to see? I'll report back tomorrow. Have a good day.

vapuser:
PCB Backside top of board.

bperkins01:
Mine came with a gasket. Just a little thermal paste - don't worry beyond that - its just to help the heat dissipate. I even think there was a little packed of paste.. (Can't remember now) but it takes slightly more than a smudge of goo.

No +5V explains a lot.. since the PCB board does all the thinking and the CPU needs the +5v to think.

Mine had no -5v, no +15v and no -30v

-5v is on the ARII (replaced power regulator)
+15v is on the PCB (replaced power regulator)
-30v is on the PCB - which I thought was not there because of the +15v - BUT - it turned out that I needed to replace the 555 timer chip.. which somehow takes the -15 and +15 and makes +30v.. which then feeds the high score retention chip (which my pcb did not retain high scores)

I just did the 555 last night - but haven't tested the high score yet - monitor was apart on the bench.. but I'm 99% sure it will work.

You look to be in good shape - until the next item down stream is broke - but good digging!!
Now the hard part... waiting
:applaud:

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