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PC 703 problem [message #14922] Thu, 16 December 2010 21:27
cassent5150 is currently offline  cassent5150
Messages: 341
Registered: August 2009
Senior Member
This is a K200-1. Set this up at the gig turned it on and stepped away to set some other equipment up and it popped and started humming. I found a bad cap in the output section and replaced it, and I'm working on the regulator issue. so far I replaced the Q712, Q713 and Q710 all blown. The 3 2N3638s seem fine as well as Q711,Q718 and Q714. I have 35.4 volts plus and .1 volts minus. I cant find any shorted caps and dont have a tester for them. any ideas here. Steve C


Update: recaped the whole regulator. Changed out all but 3 of the transistors in that section and PROBLEM SOLVED !!! 9.1+ and 8.9- were good to go now.

Steve C

[Updated on: Sun, 19 December 2010 19:04]

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