5-14
Servicing
Troubleshooting
If the output power is low
1
Check for the following common problems:
❒
Check that the front-panel
ACTIVE
key is on. If the
ACTIVE
or
LINE
LEDs do not
light, refer to “To check the A4 Power Supply Board Assembly” on
page 5-18.
❒
Clean the
OPTICAL OUT
connector as described in “Cleaning Connections for
Accurate Measurements” on page 2-11.
❒
Remove any modulating signal from the rear-panel
MODULATION INPUT
con-
nector. Modulation reduces the average output power. Of course, the de-
crease in power is tied to the duty cycle of the modulating signal.
❒
Check the rear-panel
MODULATION INPUT
connector. If a BNC short is con-
nected, the output is turned off.
2
Perform the adjustment procedure “To adjust total power” on page 5-24.
Confirm that the power is low and cannot be adjusted within the specification.
3
Perform the procedure “To check the A4 Power Supply Board Assembly” on
page 5-18.
4
Perform the procedure “To check the A5 Laser Driver Board Assembly” on
page 5-15.
5
Perform the procedure “To check the A2A2 Laser Modulation Board Assembly”
on page 5-17.
