My FLASHERS on Williams Indiana Jones have no power...not working

gsrogers

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My FLASHERS on Williams Indiana Jones have no power...not working

Hey guys.....I have a problem with the Flashers on my Williams IJ.
First it was blowing Fuse F111 so I replaced BR4 (bridge diode). Now it is not blowing the fuse but all of the flashers still do not work. I tested voltage with my multimeter and I do not get any voltage on the J102 connector. This connector states 16VAC from transformer secondary. I tested the volts on these wires at the connector by the transformer and get nothing.

Also tested the red wire at each flasher...nothing.

Do I have a transformer problem or is this "secondary" wire loop missing something that will complete the circuit?

Could a new "bad" BR4 create these results?

What should I test next?

Thanks in advance for any tips.
 
Update

OK, Here is some more date....

LED#5 is not lit.
I obtained another WPC89 driver board (working) and swapped it in....same condition. No voltage at J102 and no LED#5.

So the problem is not on the board. Since it is a common voltage issue to all Flashers anyone have a place to start looking?

Thanks
 
OK, Here is some more date....

LED#5 is not lit.
I obtained another WPC89 driver board (working) and swapped it in....same condition. No voltage at J102 and no LED#5.

So the problem is not on the board. Since it is a common voltage issue to all Flashers anyone have a place to start looking?

Thanks

When you tested the AC voltage at J102 pin 2 and 4 did you have the coin door closed? If so you should have around 16 VAC. If no AC voltage with coin door closed you could have a bad interlock switch but if no voltage at the interlock switch then check at the transformer. Don't see how the transformer could be bad but you never know.
 
They are working....finally figured it out. The coin door has to be closed for them to work.

This got me because I have another IJ and the coin door does not have to be closed for the Flashers to be tested...not sure why they designed it on some where the door has to be shut.

Oh well...feel stupid and relieved.

Thanks to all.

G
 
They are working....finally figured it out. The coin door has to be closed for them to work.

This got me because I have another IJ and the coin door does not have to be closed for the Flashers to be tested...not sure why they designed it on some where the door has to be shut.

Oh well...feel stupid and relieved.

Thanks to all.

G

Yea, according to PinWiki in the LEDs and test points with LED5-TP7 "Normally lit. Indicates presence of unregulated 20VDC. AC voltage is rectified by BR4 and smoothed by C11. The voltage is used to power the flash lamps. Note that beginning sometime during production of Twilight Zone in 1993, a "coin door interlock" switch was added. This switch interrupts power to both the 20VDC and 50VDC circuits when the coin door is opened, providing a measure of safety against higher voltage shocks. If the coin door is opened with power applied, this LED will fade to off. It will not light with the coin door open."I am sure we all have had the interlock switch catch us off guard before on both pins and video games. I know I have. :rolleyes:
 
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