
B–70115EN/03
6. TROUBLESHOOTING
166
First check if PRM No. 15216 [262] is taking the value of 60, which is
a standard. In case the fluctuation continues with this value used, read the
laser output monitor value indicated in DGN=906 [878]. Its range of
fluctuation is smaller than 50. If it exceeds this value, check the
followings.
1) Is the coaxial cable between the laser power sensor mounted on the rear
mirror holder and the relay PCB B or the cable between the
intermediate PCB B and the IF PCB (A16B–1110–0223: FS0–L,
A16B–0128– C202 or A16B–2100–0141: FS16–L, 16i–L) inside the
laser oscillator fixed tightly?
2) Is there anomaly in the laser power sensor output? Is the DC resistor
between the terminals of the power sensor unit in the range
100–500W?
3) Is the ratio of input(LPWI–0V)/output(LPWT–0V) of the relay PCB
B (A16B–1600–0361) amplified by the factor of 120 in DC level?
If there exists any anomaly in the results of the above investigations,
replace the anomalous component.
When there occurs short circuit in either cooling fan, electromagnetic
valve, or stabilized power unit, non–fuse breaker (NBK1) trips.
Replace the anomalous component and check the state of cables. If any
anomaly exists there, correct it.
6.4.5
Display of Fluctuating
Laser Output on CRT
6.4.6
Non–fuse Breaker for
Cooling Fans,
Electromagnetic
Valves; and Stabilized
Power Sources is
Tripping.