INFICON Maxtek PM-700 Plating Monitor - Manual (Page 71)

PM-700 SERIES PLATING MONITOR
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5. TROUBLESHOOTING
This section is included to help isolate, as rapidly as possible, any failures that
may occur in the monitor setup.
The monitor's internal self test features allow for quick isolation of both system
installation faults and failures internal to the monitor unit itself. However, please
note that in-field service of the monitor unit is NOT recommended and may
indeed void the warranty.
The following table describes possible problems that could occur. With each
symptom is a list of probable causes.
CAUTION
Remove AC line power before disassembling
the monitor to avoid electrical shock.
5.1 TROUBLE-SHOOTING AIDS
Symptom Probable Causes
1. Front panel displays never
illuminate:
Voltage selector p.c. board is in the
wrong position.
Line fuse is blown, rear panel fuse
holder.
2. Random "P FAIL" occurrence: Low AC line voltage.
Intermittent AC line connection.
3. Random probe failed indication: Defective or overloaded sensor
crystal.
Defective crystal retainer ring.
Defective sensor oscillator.
Improper installation of sensor
crystal.
Wrong crystal frequency selection.
Defective cables.
Solution leakage - crystal retainer or
O-ring not properly installed.
Failure in probe buffer circuitry in
the monitor.