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Old 1st October 2019
Gear Maniac

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.

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