Troubleshooting Chart - Teledyne HASTINGS 200 Instruction Manual

4.2

Troubleshooting Chart:

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Display has no indication regardless of the position of the Channel Selector switch
and all TP voltages are 0.0 VDC.
First, ensure the unit is plugged into an operating source of AC power of the
proper voltage for the unit. If so, unplug the instrumentation and remove the fuse
from the back of the unit. Replace it with a 0.5 amp 250 volt fuse if it has failed.
TP-2 is approximately 1.25 V, but TP-3 is correct.
C4 has failed. Replace it.
TP-2 is 0, but TP-3 is correct.
The positive voltage regulator (U1) has failed. Replace it.
TP-3 has approximately -1.25 V, but TP-2 is correct.
C5 has failed. Replace it.
TP-3 is 0, but TP-2 is correct.
The negative voltage regulator (U2) has failed. Replace it.
TP-4 is incorrect but TP-2 and TP-3 are correct.
Adjust the 5 volt reference potentiometer (R6) until the proper voltage at TP-4
is obtained. If it cannot be obtained, the reference regulator (U3) has failed.
Replace it.
TP-3 and TP-2 are both low but non-zero.
Check to see if the power supply 110/220V source selector switch (S2) is in the
proper position for the AC supply being used.
No command voltage reaching one or more flow controllers, and all test points
read correctly.
Check to ensure that the command source selector switch and valve override
jumpers are on.