HP 9020 Service Manual page 144

4-44
Assembly Access
Reassembly Notes
Two pins on bottom of chip module carrier must mate with two holes in
printhead interconnect board. Otherwise, damage to chip modules
could occur when head backing plate is replaced. Ensure chip modules
are correctly seated and that chip module carrier and printhead inter-
connect board are flush with each other. Ensure that head backing plate
is flush with chip modules before replacing screws. Do not force plate
and modules to be flush or damage could result.
Remember to replace ground strap when installing heat sinks.
Logic Board/Motor Drive Board
To remove the printer and separate the logic board from the motor drive board, proceed as follows:
1. UNPLUG COMPUTER POWER CORD FROM AC OUTLET.
2. Remove printer from computer as previously described.
3. From front of printer, disconnect two signal/power cables, one from each board (Figure
4-36).
4. Place printer on its front.
5. Disconnect three cables from the boards, two from motor drive board and one from logic
board (Figure 4-45).
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CABLE CONNECTOR
Figure 4-45. Disconnecting Cables from Logic and Motor Drive Boards