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Note
be necessary to disconnect addition rigid cables and loosen the
transer switch.
5. Connect the IF cable from the output of the R sampler, to the IF Output of
the suspect sampler.
Disregard the trace.
If the instrument phase locks and no error message is displayed, the
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sampler under test is normal. Go to "2nd Converter Check."
If the instrument displays the PHASE LOCK CAL FAIL error message, either
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the sampler or its control and bias voltages are faulty. Continue with
Sampler Voltage Check
Note
The BIAS CONTROL line is not used.
1. Measure the SAMPLER CONTROL voltage (green wire) at the suspect
sampler. The voltage should be about +0.2 V when the sampler is on.
If the sampler control voltage is wrong, replace A51, the interface
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assembly. (Do NOT replace the sampler: the problem is in the control
signals.)
If the sampler control voltage is correct, proceed to the next step.
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2. Check the + 15 V and -15 V supply voltages.
If the supply voltages are within 5% of nominal, replace the sampler.
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If the supply voltages are incorrect, refer to "A51 Interface Power Supply"
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at the end of the Source troubleshooting section.
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Table of Contents
Troubleshooting
