[Evan Sabby]

I have a question about the bias adjust portion of the testing.

I place the positive (+) test probe from the DMM on TP4 and the negative (-) test probe from the DMM on TP2.  I power on the unit and adjust P2 until I read 3 volts.  My question is after I get P2 adjusted to 3 volts the voltage begins to drop very slowly and continues to drop over time.  Is this ok?  If not what do I need to do to fix it?

I appreciate any input.

Thanks,

Evan

[JPK]

It is normal for the voltage to drop a little, around 100mV, as the unit warms up but it should stop when it reaches its equilibrium temperature.

[Evan Sabby]

Thanks.  Should I wait for the voltage to settle before I adjust P2 to 3 volts or will it be ok the way I adjusted it right after I powered the unit on?

[JPK]

I ususally wait 5 mn before adjusting.

[Gavin1393]

Did you get your issue solved Evan? I had a similar problem, my MP just kept droppong indefinitely. Turns out my Q6 (one with the 90 degree bent legs) wasnt contacting the PCB...a little more solder sorted it!