Black Matrix
Well-known member
Hey all,
Here's the skinny. I bought this Frankenstein pin and its driving me apeshit. The power supply board basically works like this. AC voltage feeds from the transformer and gets split to + and - 12 volts DC by the bridge rectifier. I HAVE BOTH + AND -12 VDC so the bridge should be fine. The +12 feeds the 5 volts. It goes into a transistor (TR5) which is a 2N6057 and is regulated by an MC1723CP (IC1) chip. My output is currently .1 VDC. I have replaced the transistor, and regulator. I tested all the remaining resistors, fuses and diodes and all appear to be good. I re flowed the solder on the CAPS which I believe are filter caps. I can't figure out why I am only getting .1 volts and I was hoping someone had run into this before. I'm stumped and at a loss.
You can find the manual at this site:
http://files.flipperspill.no/Support/Pinball/Pinball_Manuals.htm
and its page 81 if anyone wants to take a look at it. I will start replacing resitors, diodes and fuses next, but like I said, I'm stumped and I'm at a loss. Looking for suggestions and things to try.
Thanks in advance
Here's the skinny. I bought this Frankenstein pin and its driving me apeshit. The power supply board basically works like this. AC voltage feeds from the transformer and gets split to + and - 12 volts DC by the bridge rectifier. I HAVE BOTH + AND -12 VDC so the bridge should be fine. The +12 feeds the 5 volts. It goes into a transistor (TR5) which is a 2N6057 and is regulated by an MC1723CP (IC1) chip. My output is currently .1 VDC. I have replaced the transistor, and regulator. I tested all the remaining resistors, fuses and diodes and all appear to be good. I re flowed the solder on the CAPS which I believe are filter caps. I can't figure out why I am only getting .1 volts and I was hoping someone had run into this before. I'm stumped and at a loss.
You can find the manual at this site:
http://files.flipperspill.no/Support/Pinball/Pinball_Manuals.htm
and its page 81 if anyone wants to take a look at it. I will start replacing resitors, diodes and fuses next, but like I said, I'm stumped and I'm at a loss. Looking for suggestions and things to try.
Thanks in advance