HP 7925D Service Manual page 249

Appendix A
a. Perform the preparation for service procedure out-
lined in paragraph 5-2 of the main manual.
b. Ensure that the ac power cord is disconnected
from the ac mains power source.
c. Open the rear door.
d. Remove the four screws (2) that secure the rear
shield (1) to the cabinet frame.
e. Disconnect the cable assembly (5, figure A-23)
from the self-test PCA.
f. Remove the three screws (6) that attach the HP-IB
shield (5) to the rear shield.
g. Remove the two screws
(8)
that attach the HP-IB
shield to the self-test PCA.
h. Remove the two screws (10) that attach the ground
bracket (12) to the self-test PCA.
i. Remove the self-test PCA from the self-test panel
(14).
A-76
7925
The self-test PCA is installed by reversing the above
procedure.
A-91. CARD CAGE FAN
To remove the card cage fan (13, figure A-23), proceed
as follows:
a. Perform the preparation for service procedure out-
lined in paragraph 5-2 of the main manual.
b. Ensure that the ac power cord is disconnected
from the ac mains power source.
c. Remove the shroud (refer to paragraph 5-3).
d. Disconnect the power cord (10) from the fan.
e. Remove the three screws (11) and spacers (14) that
attach the fan to the card cage.
To install the fan reverse the above procedure. When
installing the fan ensure that the airflow arrow on the
fan points toward the outside of the disc drive.