Trouble Isolation; Quick Tuning Checkout Procedure; Figure 8-12. Laser Tube Tuning Characteristics - HP 5501B Operating And Service Manual

Laser head

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Remove four Pozidriv screws (H10) that secure A1 Connector board to rear panel

assembly (MP4).

With rear of laser head facing you, tilt the top edge of the A1 assembly toward you. This

will give ample clearance to remove the laser assembly.

Remove two Pozidriv screws (H8) from laser base. Secure the laser assembly to ensure

that it doesn't move. Remove two set screws (H3), associated lock washers (H13), and

flat washers (H15) using a 3.0 mm Allen wrench.

Remove laser assembly from laser head chassis.

Disconnect the tube's high voltage power supply lead from the A2 High Voltage Power

Supply by rotating the black, knurled fastener in the counterclockwise direction; prevent

the wire's rotation as you unscrew the fastener.

To install the laser assembly, perform the reverse of the removal procedure.

ENSURE A2 HIGH VOLTAGE POWER SUPPLY CABLES ARE NOT

PINCHED BETWEEN A5 LASER ASSEMBLY AND LASER BASE

DURING REINSTALLATION OF LASER ASSEMBLY.

8-61.

The laser assembly consists of an aluminum housing, laser tube, magnets, telescope and the

quarterwave/half-wave plate assembly. The telescope expands and collimates the beam. The

quarter-wave plate and half-wave plate establish the orientation of the two laser beam

components.

8-62. TROUBLE ISOLATION

8-64.

The following procedure provides a means to quickly check the entire optical tuning subsystem

of the laser head. Before performing the procedure, read the information in paragraphs 8-26

through 8-39 to gain the necessary background information to aid in interpreting the test results.

Figure 8-12 illustrates the effects of mirror spacing on F1 and F2.

HP5501B

Service

8-19

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