Quote:
Originally Posted by stonehopper
TR5 power on; Red lead 9.5v; Black 1.83v; Base(?) 1.95v.
Should I not be testing these components for resistance off the board?
Derek
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TR5 looks like it is OK, this can be checked for forward and reverse, collector to base, base to collector and so on, in situ with no power applied of course as you did with the OC's.
resistors can give misleading readings in circuit as all the other resistors are also in the circuit with the one being measured, an end has to be lifted to measure a resistor, so only check those which give cause for concern as most will still be ok and should not be unsoldered for no real reason.
The fault is somewhere in the driver transformer secondary (output OC81 base) stage as far as I can tell without having the circuit to look at.
Geof