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I
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Problem
5. Meter pegged hard against either
stop.
·:,:)
Possible Causes
5. Defective op amp or associated circuit
component. Check that the amplifier
has a D C gain of 200.
Ein
0 mV
5 mV
10 mV
Eout
2V de
IV de
OV de
I. Defective amplifier or associated
component.
Cure
Troubleshoot and repair.
Troubleshoot and repair.
6.10 Thermocouple Process Control (Refer to Fig. 5-9 and Fig. 6-2)
I. One P.C. circuit will not
its associated relay.
2. One P.C. circuit will not de-energ
its associated relay.
3. Both P.C. circuits cannot be set.
I. Defective amplifier IC 13-A or B,
or associated component. Check
the voltage at test point W or X
to determine if the problem is with the
amplifier or relay driver.
I.
Defective amplifier IC l 3-A or B,
or associated component. Check the
voltage at test point W or X to determine
if the problem is with the amplifier or
relay driver.
I. Defective -5.1 V de supply component
R54 or CR33.
Troubleshoot and repair.
Troubleshoot and repair.
Troubleshoot and repair.
·•. l
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