Procedure - HP 5501B Operating And Service Manual

8-72. Procedure

a. Apply power to the HP5501B.
b. Wait until rear panel LED's finish sequencing (see Table 3-1). The LED's should reflect
the following status.
+15V SUPPLY UNBALANCE............OFF
-15V SUPPLY UNBALANCE..............OFF
+15V FUSE.......................................OFF
-15V FUSE.........................................OFF
c. If laser light is not emitted from the laser head, check that the exit shutter is open.
Otherwise, see High Voltage Power Supply Troubleshooting in paragraph 8-89. Within
10 minutes of turn-on, the HP5501B's READY LED indicator should turn on continuously,
and the REFerence frequency signal should have been applied to the rear panel
REFERENCE SIGNAL connector. Otherwise proceed with step d of this procedure. If the
failure mode occurs after the 5501B has reached the optical tuning mode (normal
operation), skip steps d through k of this procedure. Steps d through k address failures
that prevent the laser from reaching stable tuning.
d. Disconnect power and remove the covers of the HP5501B. Set A1S2 to TEST and verify
that all boards are seated correctly and all test jumpers on the A3 board are in the left-
most position (NRM).
e. Connect power. Check the following voltages. If any are incorrect, see Power Supply
Troubleshooting in A3 Troubleshooting Procedures (paragraph 8-151 or see A1
Connector Board Troubleshooting Procedures (paragraph 8-84):
WITH A1S2 IN THE TEST POSITION, THE HP5501B HIGH VOLTAGE
POWER SUPPLY IS ENABLED WHEN THE LASER HEAD IS IN
OPTICAL MODE.
f. Disconnect power for a few seconds, then reconnect. Observe READY LED on the
HP5501B. Find the READY LED description in steps g through j that matches your
observation and follow that step.
g. READY LED (green) takes longer than 6 minutes to start to blink. Either the digital
section is not working or the heater is not being heated properly. Check the following
procedures:
•
A3 Digital Section
•
A3 Power Amplifier
•
A3 Warm-Up Error Amplifier
•
A3 Subtracting Sample and Hold
8-24
A3TP8: +14.7V to +15.3V
A3TP9: +4.75V to +5.25V
A3TP10: -14.7V to -15.3V
+15V POWER ON...................... ON
-15V POWER ON ....................... ON
READY ....................................... ON
LASER ON ................................. ON
HP5501B
Service