
B–70115EN/03
6. TROUBLESHOOTING
159
Laser beam not generated (Refer to bit 6 of DGN F221 [bit 6 of 172].)
This alarm is issued, if an attempt is made to radiate a laser beam, when
the laser oscillator is not in the LSTR state (discharging state).
Exhaust pump operation abnormal (Refer to bit 3 of DGN.)
The thermal magnetic contactor for the vacuum pump has tripped.
No. Cause of trouble Solution
1 Anomaly of exhaust
pump
Replace the exhaust pump.
2 Anomaly of IF PCB If no thermal switch has tripped, replace the
IF PCB.
3 Signal cable broken Replace the cable.
Gas pressure not reached (Refer to DGN 905 [860].)
This alarm is issued, if the discharge tube gas pressure does not reach
[specified discharge tube gas pressure during oscillation – tolerance]
after HV is set to ON.
No. Cause of trouble Solution
1 Invalid parameter set-
ting
Check whether the values of PRM Nos.
15001/bit 3 [3981/bit 6], 15247 [4398], and
15248 [4399] are set as indicated in the at-
tached data sheets. If a different value is set,
set the value specified in the data sheets.
2 Gas leakage from in-
ternal piping
1) Check whether any component joints of the
gas circulating system are loose. If a loose
joint is found, tighten the joint firmly.
2) Check whether any components of the gas
circulating system have cracked. If a
cracked component is found, replace that
component.
3) Check whether there is a hole in a dis-
charge tube. If a hole is found in a dis-
charge tube, replace the discharge tube.
3 Pressure sensor ab-
normal
Replace the pressure sensor.
Alarm No. 4090 [690]
Alarm No. 4094 [–––]
Alarm No. 4099 [695]