b. Place the liquid crystal in the test setup shown in Figure 8-16 below:
Figure 8-16. Liquid Crystal Test Setup
c. Gently place the probes of the 50 Hz signal source on the end shoulders of the liquid crystal as shown in
Figure 8-16
and observe the window area, it should go from light to dark while probing the device. A faint
change of color or no change indicates a faulty liquid crystal. The replacement HP part number for the liquid
crystal is 1990-0768.
CAUTION
Do not apply DC voltages across the liquid crystal switch. Sustained dc
current flow through the liquid crystal may damage the device.
8-73. HP 5517B/C/D Trouble Isolation Procedure
8-74. Before HP5517B/C/D trouble isolation is attempted, the Laser Head Block Diagram Description paragraphs 8-
20 through 8-47) should be read. All electronic tests can be performed using an HP 5005B Signature Multimeter.
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