Separation Of The Cpu From The Backplane - Zeiss humphrey HFA II-i series Field Service Manual

Parts Removal/Replacement
10) Remove the three screws and right side bracket that secures the CPU/Backplane
Enclosure to the chassis.
11) Disconnect the DC Distribution cable from the bottom of the backside of the MDB.
12) Remove the six screws securing the Motor Driver PCB to the chassis.
13) Slide the MDB to the right and disconnect the JMPS ribbon cable connector at the
P15 connector located in the bottom of the middle of the MDB.
14) Remove the Motor Driver PCB.
Replacement Notes:
Reconnect the cable to the back of the Motor Driver PCB before reinstalling the PCB.
P
Follow-up Checks/Adjustments:
See Table 3-1.

3.9 Separation of the CPU from the Backplane

NOTE - Improper attempts at separation of the Backplane board and Processor board can result in
irrepairable damage to the backplane board or processor board.
1) Place the index finger of your left hand on the E9 mounting hole located along side
the PCI connector of the Backplane Board.
2) Place the thumb of your left hand on the E10 mounting hole located along side the
EISA connector of the Backplane Board.
3) Grasp the CPU PCB board by the edge bracket with your right hand.
4) Pull straight up on the CPU PCB with you right hand while holding the backplane
board flat with your left hand until the CPU PCB pops out of the PCI and EISA
sockets.
Follow-up Checks/Adjustments:
See Table 3-1.
Field Service Guide
Humphrey Field Analyzer II - i
Confidential and Proprietary
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