Zeiss humphrey HFA II-i series, Field Service Manual

Page: 63 / 521

Humphrey Field Analyzer II - i Parts Removal/Replacement
Confidential and Proprietary
52235C1105 3 - 17
Field Service Guide
3.6 CPU/Backplane Enclosure Removal
1) Disconnect the printer, COM1, COM2, keyboard, mouse, external VGA, ethernet and
USB connections from the connectors located on the outside of the CPU/Backplane
Enclosure right side.
2) Remove the three M3 screws and washers that secure the top left bracket to
CPU/Backplane Enclosure and to the chassis.
3) Remove the four M3 screws and washers from the enclosure lid.
4) Remove touch screen cable connector and patient switch cable connector from the
left side of the Backplane board.
5) Remove the drive lamp LED connector from the bottom of the J12 connector on the
CPU board. Note that the two wires connect to the bottom two pins of the connector.
6) Slip the touch screen and patient switch cables from the wire clamp on the left inside
wall of the CPU/Backplane Enclosure.
7) Slightly compress and remove the snap bushing from the top left corner of the
CPU/Backplane Enclosure.
8) Slide the touch screen and patient switch cables out of the CPU/Backplane Enclosure
through the slot.
9) Remove the CRT and POWER connectors from the backplane board.
10) Remove the JXVID and JMPS connectors from the backplane board.
11) Remove the two M3 screws and cable clamp that secure the IDE, Floppy and video
cables to the top of the CPU/Backplane Enclosure.
12) Remove the inner front screw of the top fan assembly and the Ferrite clamp screw that
secure the ferrite clamp to the top of the CPU/Backplane Enclosure.
13) Remove the Floppy drive and IDE cable connectors from the top ride side of the CPU
board.
14) Remove the ferrite clamp and attached cables from the CPU/Backplane Enclosure
15) Loosen and release the captive screw on the left side of the bottom CPU/Backplane
Enclosure bracket.
16) Loosen the captive screws on the right side of the bottom bracket.