Zeiss humphrey HFA II-i series, Field Service Manual

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Parts Removal/Replacement Humphrey Field Analyzer II - i
Confidential and Proprietary
Field Service Guide
3 - 12 52235C1105
3.3 Rear Cover Assembly Removal
1) Remove the front cover assembly (3.2).
2) Remove the projection lamp access cover.
3) Remove the fan filter door completely (to avoid interference during rear cover
removal.)
4) Remove the cables and cords from connector on the back panel.
5) Remove the two screws located near the top of the rear cover assembly.
6) Remove the two screws that were exposed by removing the fan filter door.
7) Remove the four screws located along the bottom and side of the rear cover
assembly.
Caution — While the cover assembly is being manipulated in the next
step, be very careful to avoid damaging the neutral density wedges which
are located very close to the top of the cover. The projection lamp cable
and the heatsink on the CRT PCB also are very close to the cover.
8) Pull the rear cover assembly part way out, disconnect the fan connector, and then
remove the rear cover assembly.
Replacement Notes:
P
Remember to reconnect the fan before reinstalling the rear cover.
P
Work carefully to avoid damaging the projection assembly by contact with the cover
assembly.
P
Be careful of the routing of various cables to prevent them from being damaged by
being pinched between the rear cover assembly and the frame.
P
After the unit is reassembled and power is applied, check that the fan is operating.
P
Ensure that the brightness potentiometer moves freely.
Follow-up Checks/Adjustments:
See Table 3-1.