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Model 5501A
Maintenance
Items listed i n order of most probable cause of failure:
0 ,
A3 LASER TUBE ASSEMBLY
A4 BEAM SPLITTER ASSEMBLY
PZT CONTROL
LASER BEAM
A6 PZT POWER SUPPLY
@
a.
Check PZT Power Supply by measuring M . 2 N to C1.8V at A7(TP2).
b. Replace power supply if readings are incorrect.
@
a.
Check/Replace A5 Lock Reference Board ~ s s e m b l ~ .
b.
Perform reference threshold adjustment.
c.
Perform photo-diode off-set adjustment.
@
a.
Check/Replace A3 Laser Tube Assembly.
b. Perform laser current adjustment.
c.
Perform reference threshold adjustment.
PZT SAMPLE
@
a.
Replace A5 Lock Reference Assembly.
b.
Perform reference threshold adjustment.
-
-
Figure 4-3. Automatic Retune Loop Failure Analysis
A5 LOCK REFERENCE BOARD
(0.27
to
1.8V)
A
A1 CONNECTOR BOARD
*
ELECTRICAL REF SIGNAL
Q L
PZT POWER
SUPPLY
CONTROL
&
Y'\
A7 CONTROL BOARD
-
0
SPLIT BEAM
LC
?
CLAMP
R
?
E
0
'"
%
v
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