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Model 5501A
Maintenance
d. Observe the rear-panel indicators of the 5501A while depressing, then releasing, the RETUNE
switch. The indicators should be as described in Table 4-3.
Table 4-3. Indicator Conditions During Retune
e. Disconnect plug to 5501A REFERENCE SIGNAL connector and check for a proper signal a s shown in
Table 4-4.
l ndicator
+15V UNBAL
-15V UNBAL
f15V FUSE
-15V FUSE
POWER ON
LASER CURRENT
RETUNE FAILURE
RETUNE
f.
Reconnect all cables and observe red beam emitted from 5501A. DO NOT STARE DIRECTLY INTO
BEAM.
Condition
OFF
OFF
OFF
OFF
ON
OFF
If on, should go off after RETUNE switch is depressed.
Light goes off approximately 9 seconds after switch is released.
APPROX.
0.5 us
Table 4-4. Reference Signal
4-6.
INSTRUMENT ACCESS
Reference Signal
Connector Pin
4-7. Access to the assemblies within the laser head is required to troubleshoot or adjust the laser head
circuits. The following paragraphs describe how to remove the laser head covers and how to remove and
reinstall the major assemblies.
Signal
HIGH VOLTAGES ARE GENERATED WITHIN THE LASER HEAD
HOUSING. THE COVER OF THE LASER HEAD CONTROLS A
SAFETY INTERLOCK SWITCH T O PREVENT ACCIDENTAL ACCESS
T O THESE VOLTAGES; T O ENSURE SAFETY AN D POSSIBLE
EQUIPMENT DAMAGE, HOWEVER, ALWAYS DISCONNECTTHE
POWER SOURCE FROM THE LASER HEAD BEFORE REMOVING
THE COVERS.
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