Dwight Elvey
Veteran Member
Hi
We can do more with a voltmeter but this is a simple test that we can
run with a piece of wire.
You need to connect one end of a piece of wire to ground. Touch the
other end to the base lead of the Q202. If you don't know which is
the base lead, try all three one at a time. Just be careful not to touch
anything else and that it is a circuit ground you are connected to.
If the circuit is working correctly, touching ground to the base
lead should cause the CRT to go dark.
If this doesn't cause the CRT to go dark, we'll know that it is something
towards the CRT that has failed and if it does go dark, it means it
is something towards the input.
Dwight
Hi
I should note that this is not a general test for all the transistors.
It is just that this particular transistor can be tested this way because
of its circuit.
Dwight