Winchester Fixed Disc Drive Controller Assembly; Removing Fixed Disc Drive Controller Assembly - HP 9020 Service Manual

Assembly Access 4-15
Winchester Fixed Disc Drive Controller Assembly
The Winchester Fixed Disc Drive Controller Assembly consists of an I/O card and a disc controller
mounted together and interconnected by cables. The assembly must be removed from the compu-
ter as a unit. The I/O card or disc controller can then be removed from the assembly for replace-
ment. All procedures follow.
To remove controller assembly from computer:
1. UNPLUG COMPUTER POWER CORD FROM AC OUTLET.
2. Remove right side door as previously described.
3. Remove three #2 Pozidriv screws from mass storage cover (Figure 4-12).
4. Loosen two captive thumbscrews on I/O door (Figure 4-12) and swing door open, allowing
door to rest in open position. Use flat-blade screwdriver to loosen thumbscrews.
5. Slide mass storage cover toward front of computer, disengaging cover from slot in front card
guide.
6. Lift mass storage cover with attached I/O door up and away from computer.
CAUTION
CAREFULLY HANDLE ASSEMBLY TO PREVENT DAMAGE FROM
ELECTROSTATIC DISCHARGE OR OTHER CAUSES. HOLD BY
EJECTORS OR SIDE EDGES ONLY. DO NOT TOUCH EDGE CON-
NECTOR CONTACTS OR CARD PLANES. IMMEDIATELY PLACE
ASSEMBLY IN ANTISTATIC BAG OR ON ANTISTATIC SURFACE.
7. Remove both cable connectors from controller assembly (Figure 4-14), unseat assembly
from I/O backplane by pulling out on ejectors, and slide assembly out of slot.
EJECTOR
CABLE CONNECTORS
EJECTOR
Figure
4-14.
Removing Fixed Disc Drive Controller Assembly
Reassembly Note
Seat replacement controller assembly firmly in 110 backplane and push
ejectors in to lock card in place.