Fish Tales
Williams, 1992You're currently viewing posts by Pinsider shlockdoc.
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I have a strange power up issue I can use some advice for. When I turn on the game it might take 2 or 3 times powering it on/off to get it to boot correctly. Sometimes a single try. Once powered up plays great no issues. On the failed attempts I either get a bong noise and nothing or a slight buzz. Once it gets it right I get a slight tick, tick, tick, tick then good to go. Any advice if this is a switch issue or a capacitor issue?
I have 5v dc and 10.5 ac on pin 5 is that correct? I don't get any error LEDs on the cpu.
D19 d20 and d21 all stay lite when it does not boot correctly.
Quoted from pincredible:Maybe check or replace the thermistor in the power switch box.
How do you check that?
Quoted from terryb:The 10.5 AC is not a valid reading. For this technique to work you need a decent meter and set it on the lowest AC range. Although your problem really doesn't sound like a ripple issue to me.
I would try kvan's advice first.
I tried kvan's advice no luck 
My meter is decent - I was grounding to the braid.
Quoted from terryb:It should be 5 volts. If it's zero volts there's a problem with the blanking circuit.
Black lead on ground braid, red lead on pin 3 of U21.
Repeat the test until you are measuring it during a failure.
I finally got to test it. When it boots its 5v. When it foes not boot correctly there is 0.06 volts.
How do you fix a blanking circuit? Thanks. Sorry it took forever.
Quoted from DSBDBB:Did you test Pin 5 on J210 when you had 0.06 volts at U21 to confirm 5 volts is coming into the CPU board.
I had a similar problem on a WCS and found it to be the ASIC chip holder causing the blanking circuit to drop out. I simply pressed on it and the machine worked fine. I had the chip holder replaced in the end for a permanent fix.
ASIC chip is seated nice. I got 12v on pin 5 of j210 when u21 had the .06v. You say 5v did you mean 12v on j210?
Quoted from DSBDBB:J210 has both 12 volts and 5 volts. Are you sure you checked the correct pins?
From top of J210 to bottom:
Pin 1 - Black - Ground
Pin 2 - Key
Pin 3 - Black - Ground
Pin 4 - Grey +5VDC
Pin 5 - Grey +5VDC
Pin 6 - Grey/green +12VDC
Pin 7 - Grey/green + 12VDC
Pins 4 and 5 are both the same +5VDC so you should be able to test either. You should test both these pins from pin 1 or 3 to confirm a good ground as well.
As previously mentioned you may need the remove and refit the ASIC chip even if it looks good.
I thought I checked the correct one - this is very helpful. Thank you. I will check again - i need to get a tool for asic chip
I get 5.06 on pins 4 & 5 and 11.97 on pins 6&7. I used pin one as the ground. When it fails to boot.
When it boots properly it is the same as above. Pin 6 varies a bit in attract mode.
Can't find my asic tool. Just ordered one from amazon.
I get 4.82 on d1 lower side when failed. Also 4.82 when boots correctly.
64 got 5.04 the other three legs got 4.82.
U4 and u6 reseated - no change.
i reseated the chip and still no good. i guess its off to a clives or someone to test it. I was hoping to be able to tech it myself. The board is still jumpered for euro 240v and someone mentioned having to cut out them out.
My guess is it is a capacitor issue on the board and that when it sits, it drains down, the quick on/off/on doesn’t allow it to dip below the required voltage. Is there a way to test the capacitors on the board?
Quoted from Pin_Guy:I think there may be some confusion here on the jumpers since you are talking about your MPU. The country selection jumpers on this board are only for the default language the machine boots up in (after a reset to factory defaults) and has nothing to do with the boards voltage selection as the board only uses the +12VDC and +5VDC from the Power Driver board.
Thanks. Just trying to cover every possible cause.
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Pleasant Hill, CA