HP 3000 Series Installation And Service Manual page 52

Ma intenance
5-16. FIELD REPAIR
Field repair of the INP is limited to the following procedures
and is to be accomplished only by Hewlett-Packard support per-
sonnel.
5-17. Field Replacement of a RAM Chip
The Random Access Memory (RAM) chips are the only components on
the INP PCA board that are field replaceable. (See figure 5-1
for their location on the board.) If troubleshooting procedures
(such as use of the self test) ind ica te tha t a RAM chip is
faulty, replace it as follows:
a. Ensure that the system operator has backed up the system
files before beginning this procedure.
b. Turn off the power.
On the HP 3000 Ser ies 30, set the POWER sw itch· (loca ted on
the front of the HP 3000/30 mainframe, as shown in figure
2-2) to the OFF position.
On the HP 3000 Series 33, set the PROCESSOR switch (located
on the side panel beneath the desk-top of the HP 3000/33
mainframe, as shown in figure 2-3) to the OFF position.
I
CAUTION
I
All power must be off when inserting
or removing any device or card in the
system.
c. Disconnect the cable hood connector and the ribbon cable con-
nector from the edge of the INP PCA board.
d. Remove the INP PCA board (part no. 30020-60001) from the card
cage.
e. With the PCA board lying on a smooth, firm surface, withdraw
the defective RAM chip out of its socket with a chip ex-
tr ac tor tool.
5-11