JBJR wrote:Readings for Q112 & Q111
Neg to C Pos to E= 4.14
Neg to C Pos to B= 3.75
Neg to E Pos to B= get no reading
Pos to C neg to E= get no reading
Pos to C neg to B= 6.54 drops slowly
Neg to C Pos to E= 3.71
Neg to C Pos to B= 3.71
Neg to E Pos to B= 1.71
Pos to C Neg to E= 6.47
Pos to C Neg to B= 6.47
It's tough to read this in circuit, since the transistor is in parallel with another diode and a few resistors. There's no short, which is good, but a couple of things look weird.
Neg to E Pos to B= get no reading,,,,,on the one hand, you should at least get a read from the parallel Resistors R150 and SVR102. On the other hand, this probe configuration should 'forward bias' the NP junction emitter to base (neg to poas) and give a very small reading from the transistor (like it does with Q111)
Q112 looks suspect because of this. Q111 and Q112 are both the same Xistor. the three wire ribbon cable is connected to the board by pressure fit, you may be able to work them loose one at a time by pressing down on the spring pins with an awl of some such (don't press too hard as to bend them permanently, just release their grip on the wire).
Since Q112 doesn't appear to be shorted (it's emitter base junction seems to be open or getting there), you can swap Q112 and Q111 and see if the problem moves to the other channel; this shouldn't destroy anything.