29
Section 4
Maintenance and
Troubleshooting
In cleaning the body of this instrument, use only a mild
soap & water solution on a damp cloth. The detector
should be cleaned only with lens paper and reagent grade
alcohol that leaves no residue.
CAUTION
Do not use acetone or other organic solvents on the
Model 840-C. Organic solvents attack the ABS Case.
The following troubleshooting guide is intended to isolate
and solve problems with the power meter so that, to the
greatest extent possible, the return of the power meter/
detector system to Newport will be unnecessary. For the
problems that cannot be resolved with information in this
manual, or for other situations that are not covered in
this section, please see Section 5 for details on returning
your entire system to Newport for service.
4.2
Troubleshooting
Guide
Table 4 Symptom/Fault Troubleshooting Guide
Symptom
Possible Fault/Correction
Blank display, unit
- Turn unit off. Press the reset key located in the
does not power up.
back of the unit. Turn unit on.
Low
+
Annunciator
- Low battery voltage. Recharge Ni-Cd batteries.
If problem persists, call Newport.
Sensor S/N does not
- Memory module mixed with wrong sensor.
match S/N displayed
Locate proper sensor or memory module.
at power up.
- Attenuator S/N does not match Detector S/N. Exit
ATTENUATOR mode, locate proper attenuator, or
change detectors. Restart meter with new power up.
Readout is
0L
- Current overload. Increase
RANGE
on meter or
decrease input signal.
Maintenance
Procedures
4.1
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