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It should be clear that the base of Q520 should not be more than -1 2vdc and Q518 +1 3vdc Q516 is
It should be clear that the base of Q520 should not be more than -1.2vdc and Q518 +1.3vdc. Q516 is
the bias and its turn on is the potential difference of RC components R540 and R538. Q518 also gets its
controlled DC via Q526. Assuming that the voltage amplifier is working correctly, then the amount of
t ll d DC i Q526 A
i
th t th
lt
lifi
i
ki
tl
th
th
t f
voltage delivered at the base of Q520 and Q518 should be within the tolerance to be governed
g
g
(controlled) by Q516.
In general practice two possibilities exist in this case
In general practice two possibilities exist in this case.
1. The base drive voltage coming from Voltage amplifier stage arriving at Q518 and Q520 is to high to
be controlled by Q516 and its associated components.
2. Q516 and its associated switching + RC and Voltage divider R-Nets are failing. Q526, C538, D506,
2. Q516 and its associated switching
RC and Voltage divider R Nets are failing. Q526, C538, D506,
D504, R562, are all part of the Q516 operators service as reference control to the bias.
Is the problem 1 or 2 or both?
Is the problem 1 or 2 or both?
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