mcandrewsoun
Well-known member
Im trying to trouble shoot one of these..
1. Looks like the BIAS on one of the driver circuits is off... In one of the FAQs theres a voltage table.. It lists the Collector voltages for Q600 and Q700 to be 34-35 volts. Im getting one at 42 and the other at 60. Ive replace almost EVERY transistor and checked every resistor.
2. Using my scope. I can verify the inputs to the custom IC are good pins (11 &14). However the output that feeds the bases of Q600 and Q700 is garbage.
3. The schematic shows a resistor from Q604/Q704 to the negative rail.. R738/R638..I dont see it anywhere on the board.
Has anyone seen this?
Andrew
1. Looks like the BIAS on one of the driver circuits is off... In one of the FAQs theres a voltage table.. It lists the Collector voltages for Q600 and Q700 to be 34-35 volts. Im getting one at 42 and the other at 60. Ive replace almost EVERY transistor and checked every resistor.
2. Using my scope. I can verify the inputs to the custom IC are good pins (11 &14). However the output that feeds the bases of Q600 and Q700 is garbage.
3. The schematic shows a resistor from Q604/Q704 to the negative rail.. R738/R638..I dont see it anywhere on the board.
Has anyone seen this?
Andrew
