
B–70115EN/03
6. TROUBLESHOOTING
146
Discharge anomaly (Refer to DGN = 909 to 914 [861 to 868]
Pressing the HVON (start discharge) button causes the unit to start
discharging. This alarm is issued, if at least one discharge tube fails
to operate.
No. Cause of trouble Solution
1 Anomaly of parameter
setting
Make a setting using the values of PRM.
No. 15220 [0247], 15221 [0248], 15241
[0237], 15222 [0249], 15223 [0250] listed in
the parameter table attached to the ma-
chine.
2 Anomaly of laser gas
composition
Specified laser gas: CO
2
/N
2
/He = 5/55/40%
(volume ratio)
Composition accuracy:
Replace the laser gas with laser
gas having an accuracy of within
"5% for each gas component.
3 Discharge tube electrode
mounting bracket loos-
ened
Check the electrode contacts, and secure
any loose mounting brackets.
4 Gas circulating system
leakage of gas or water
Tighten or replace the component(s) at any
leak point.
5 The gas flow control valve
is closed
Adjust the gas flow control valve to obtain
the specified gas flow rate.
6 Matching box monitor ab-
normal
Replace the matching box.
7 Crack or hole (which
often obscures a crack) in
the discharge tube
Replace the discharge tube.
Alarm No. 4066 [666]