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CAUTION
Make sure that you do not interchange the power-cable connectors to the logic A and logic B
PCAs.
The logic
B
power-cable connector is the one from which the disc-drive extension cable
extends (see
figure
6-32). II you interchange the logic A and logic B power-cable connectors,
serious damage
to
the
power
supply or the logic PCAs will result.
1.12.2 Removing the 1/0 Backplane peA
Before
you can remove
the
I/O backplane PCA, you
must
remove the base assembly from the com-
puter and remove its cover as desaibed in section 6.12.1. Once you have done this, follow these steps:
t.
Remove the four
screws
holding the I/O backplane PCA to the base assembly.
I.
Pull the PCA back to release it from the two plastic pins, then slide the PCA upwards. (Leave the
I/O ground bracket in place.)
3.
If further disassembly of the I/O chassis is needed, see figure 9-4.
8.12.3 Removing the HP-I. Ribbon-Cable Assembl,
Before
you
can remove the HP-IB ribbon-cable assembly, you must remove the base assembly from
the computer and remove
its
cover as described in section 6.12.1. Once you have done this, follow
these steps:
t .•
Using a 'In-inch nut driver, remove the two
hex
standoffs from either side of the
HP-IB
back-
panel connector.
I. Carefully remove the HP-IB ribbon-cable assembly from the
base assembly. See figure 9-4 for
further details.
8.12.4' Removing the Power-Supply Assembly
Before you can remove the power-supply assembly, you must remove the base assembly from the
computer as described in section 6.12.1. Once
you
have done this, remove the power-supply assembly
as described below.
Capacitors C4 and C5 will remain charged for an hour or more after the power is turned off. You
should short the leads on each of these capacitors to avoid a possible shock hazard.
t.
Remove the
power
cord if
you
have not already done so. Short capacitors C4 and CS to ground.
a.
The ac line filter
is
shown in
figure
6-31a. Disconnect the line filter ground wire from the chassis.
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