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Author Topic: Sigma PT 4B Dead  (Read 1642 times)

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Offline cbard

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Sigma PT 4B Dead
« on: October 31, 2021, 06:26:37 PM »
I just acquired this machine. I was told it was working fine and then just died.  Right now when I power up the machine all the fluorescent light come but nothing else. I get no leds so no error codes. There is no mechanical movement basically nothing happens.  Some early diagnostics I do not seem to be getting 12 V out of the power supply.  But I'm not even sure if I'm looking in the right spot.  I am also curious about about connectors on the motherboard that are not or do not have anything plugged into them are these test positions or something missing.
What I'm thinking is a problem with the power supply  and is the supply repairable or is a replacement available.
 Any thoughts or recommendations to get this backup and running would be greatly appreciated thank you in advance.
« Last Edit: October 31, 2021, 07:05:33 PM by cbard »

Offline Badbaud

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Re: Sigma PT 4B Dead
« Reply #1 on: October 31, 2021, 09:56:55 PM »
A dead game like that usually means the power supplies need to be replace.
Let them that don't want any, have memories of not getting any.

Offline cbard

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Re: Sigma PT 4B Dead
« Reply #2 on: November 01, 2021, 03:43:11 AM »
Is there a schematic out there for the power supply. I have seen wiring diagrams.

Offline Badbaud

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Re: Sigma PT 4B Dead
« Reply #3 on: November 01, 2021, 05:16:55 AM »
Just read the voltage(s) and current rating for the power supply and find a replacement. They don't cost that much.
Let them that don't want any, have memories of not getting any.

Offline cbard

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Re: Sigma PT 4B Dead
« Reply #4 on: November 04, 2021, 05:19:48 PM »
Got the machine up and running. I found that the power supply was not putting anything out on the 12v lines. So I added a second power supply for the 12 volts.

 

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