WMS 400 Not Initializing

[kcflorek]

American Spirit - Glass lamps light up.  Bill changer initializes, or at least makes the same sound it used to.  No Dotmation lights come on, reels do not make a test spin.  Candle lights are off.  Fail light on I/O board is OFF.  The 5 power supply lights on I/O board are lit.    Voltages on the I/O board corresponding to the lights all look good with a voltmeter.  Re-seated both CPU and I/O board, and all connectors I could find through out the machine.  Re-seated all E-Proms.  This issue has been occurring for some time, but after removing power, and turning it back on it would operate fine for as long as I played it, till it was powered off for a few days, and then powered on again.  Then would have to re-cycle power to get it going.  Now power cycling does not do the trick.  Any ideas ?

[Trisail]

I would check the power supplies. I know the voltages look ok with meter at board but the AC ripple is a better check. Check at the power supply connector. I'm thinking with it acting up like this for a while it's screaming that the supplies are bad, need new caps. Replace the 5 caps in the PDU also, the board under the lower power supply. I just had mine with same symptoms, not wanting to power up/boot. The 5 caps fixed all the other little problems I was going to get too.

I will assume the power switch and power cord are ok as you get the leds lit and the fluorescents are working.

Tony