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System Service
B-50.
REPLACEMENT PROCEDURES
B-51.
POWER SUPPLY REPLACEMENT. The power supply is replaced by performing the
following steps:
a. Power down the system by placing the corresponding UPPER or LOWER 128K MEMORY DC
POWER switch on the System DC Control Panel to STANDBY and place the corresponding
HP 30311A Power Supply power switch off (down).
b. Disconnect plugs P2, P3, and P4 on the rear panel of the power supply.
c.
Remove four screws on the front of the cabinet securing the power supply to the cabinet frame
and the two screws on the right rear of the power supply and remove the power supply by
sliding it forward.
d. The power supply is installed using the reverse order of the above procedure.
B-52.
BATTERY PACK REPLACEMENT. To replace a battery pack in the power supply,
perform the following steps:
a.
Remove the power supply from the cabinet by performing steps a through c of paragraph B-51.
b. Remove the top cover from the power supply.
c. Disconnect jack J7 coming from the battery pack.
d. Remove the battery pack cover plate.
e.
Remove the battery pack by lifting it out.
Install a new battery pack by using the reverse order of the above procedure. The battery float
voltage adjustment which is described in paragraph B-47 must be performed anytime a battery pack
is replaced.
B-53.
CONTROL PCA REPLACEMENT. The control board is replaced by performing the
following steps:
a.
Remove the power supply from the cabinet by performing steps a through c of paragraph B-51.
b. Remove two screws holding the control board to the metal spacers on the top right side of the
frame.
c. Disconnect plug P2 on the control board and disconnect the control board from the
motherboard. Lift out the control board.
B-36
JAN 1977
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