Author Topic: Sigma PT 4B Dead (Read 2722 times)

cbard · « **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.

Badbaud · « **Reply #1 on:** October 31, 2021, 09:56:55 PM »

A dead game like that usually means the power supplies need to be replace.

cbard · « **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.

Badbaud · « **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.

cbard · « **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.