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Post by paradisecs on Nov 11, 2017 19:01:38 GMT
So none of the #73 bulbs at the top of the machine light up. I checked voltage and the PCB board is getting power. I replaced all the bulbs and I'm still not getting any of them on. Any ideas what else to check? Power to the molex connector is good, I'll get exact voltages again because I don't remember, but the same voltage at the wire was on the PCB at the front and end of the traces.
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Post by Ron Rich on Nov 11, 2017 21:26:46 GMT
OK--1. There is no "Molex" connector--itza an A-MP (now TEC). 2.You should have 27 vac accross that connector. Lamps are 13 vac units, so, they wired them in a series of two. Sockets are notorious for "not making"--look at traces to find which pairs are wired together--assuming the lamps are good ? Ron Rich
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Post by paradisecs on Nov 13, 2017 4:52:09 GMT
Thanks for the input. I checked the voltage and it bounces around like I've never seen before. Any place I checked, PCB, connectors (both upper and lower) and the voltage reads anywhere from 2v to 28 v, and is changing constantly. It's never steady. Possible bad resistor somewhere? I did finally get the upper lamps working but not until all 8 had been replaced. If I put an old bulb in or leave one off then the entire set of lamps goes dark. In the process I found three more lamps down on the front panel of the box. Didn't even know they where there but the voltages on them is doing the same thing and I was not able to get any of the three lamps to come on. I have the service manual but I can't seem to find anything on the lamp circuits, both in troubleshooting or in the schematics.
At least for now the top is done and I'll keep working on the bottom. Again, thanks for all you do here.
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Post by Ron Rich on Nov 13, 2017 14:39:40 GMT
That makes no sense--what kind of meter are you using ? Is it set for low AC voltage ? If so, I would need to assume it's bad! Ron Rich
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Post by paradisecs on Nov 13, 2017 18:06:55 GMT
I thought that at first as well. I used my 20 year old digital Micronta and then got the same results with a cheap harbour freight digital. The only time i've seen anything remotely close is on some CNC machinery when a DC stepper motor was pulsing but I don't see anything in the circuits that would cause that.
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