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Old 1st October 2019
  #12
Gear Maniac
 

Quote:
Originally Posted by RichTone View Post
Hey all:

I’ve got a MSB V2 a friend dropped off that failed to power on out of no where.

I’ve reseated all the socketed ICs and probed the power jack. I get +5v on pin 3 of the 7503 and +10v on pin 1. No lights on the panel. Heat sync gets warm/hot. That’s as far as I’ve gotten without a schematic. Oh, I also checked all the switches on the front panel board with DMM and they all check out.

Thoughts/suggestions?
All mine have 7805 regulators, not 7503. What are you getting out of the negative output pin?