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Model 5501A
Maintenance
4-8.
To remove the front panel and side covers from the laser head, perform the following steps:
a.
Rotate the front-panel turret so that the large opening is at the bottom and the slotted, 114-turn
fastener i s visible through the opening.
b. Using a suitable screwdriver, rotate the fastener l/4-turn in the counterclockwise direction.
c.
Remove the front panel by gently pulling the panel straight away from the laser head.
d. Remove the two half-covers by gently pulling each cover outward and forward. This releases the
edges of the covers from the retaining grooves along the edges of the rear panel.
4-9. To remove the A5 Lock Reference Board Assembly, perform the following steps:
a.
Remove the two machine screws that secure the lock reference board to the A4 Beam Splitter
Assembly. These two screws also retain the circular shroud that covers the two photodiodes
mounted on the board.
b. Remove the two machine screws that secure the lock reference board tothe U-shaped, sheet-metal
sub-panel.
c. Gently remove the board from the mating connector.
4-10. To remove the A7 Control Board Assembly, perform the following steps:
a.
Remove the two machine screws that secure the control board to the U-shaped, sheet-metal sub-
panel.
b. Gently remove the board from the mating connector.
4-11.
To remove the A1 Connector Board Assembly, perform the following steps:
a. Remove the four machine screws that secure the rear panel and remove the panel.
b. Remove the two machine screws that mount the connector board to the cast base plate of the unit.
c.
Label and remove the eight wires that connect to the back side of theconnector board.Thesewires
use separate pin connectors and should be disconnected by gently pulling the wires straight away
from the connector board.
d. Remove the two machine screws and nuts that attach the 21-pin, molded-plastic connector to the
connector board and remove the connector board.
4-12.
Remove the laser tube according to the following procedure:
THE FOLLOWING PROCEDURE REQUIRES THE REMOVAL O F
H I G H VOLTAGE POWER CONNECTIONS F R O M THE LASER
TUBE. IT I S POSSIBLE FOR SOME VOLTAGE POTENTIAL T O
REMAIN ON THESE CONNECTIONS, A N D IF THE POTENTIAL IS
N O T DISCHARGED ACCORDING
T O THE FOLLOWING
PROCEDURE, INJURY T O SERVICE PERSONNEL C A N RESULT.
a.
Disconnect the high voltage power supply connection from the laser tube by rotating the white,
knurled fastener in the counterclockwise direction; hold the wire from rotating with the fastener.
DO NOT TOUCH THE SPRING-LOADED CONTACT.
b. Momentarily place the spring-loaded high voltage contact on a suitable power supply return point
such as the cast base plate on which the laser tube is mounted.
c. Remove the laser tube cathode connection (located on theside of the glass portion of the lasertube)
by pulling the connector cap straight away from the laser tube.
d. Place the laser head on its side and, while supporting the tube with one hand, remove thefour tube
mounting screws, which are accessible from the bottom of the cast base plate. When installing the
laser tube, tighten the two countersunk, crosspoint screws first, then tighten thetwo allen head cap
screws. This ensures that the laser tube is properly aligned.
e. Gently remove the laser tube far enough to disconnect the PZT anode lead, which i s located at the
rear center of the tube, then remove the tube.
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