DEC DECstation 316+, Service Manual

Page: 58 / 94

3–12 FRU Replacement
3.2.6 Replacing an Optional Hard Disk/Tape Drive
To remove or replace an optional hard disk or tape drive, refer to
the appropriate option installation guide.
3.2.7 CPU Board Replacement
Replace the DECstation CPU board as follows:
1. Locate the CPU board within the DECstation chassis
(Figure 3–5 for the DECstation 325
C
and DECstation 333
C
,
see Figure 3–6 for the DECstation 316+, or Figure 3–7 for the
DECstation 320+ and the 425
C
2. Remove the two mounting screws that secure the CPU board
to the chassis.
3. Remove the board by pulling it up and out of the slot
connector.
4. Install the new CPU board by performing the previous steps
in reverse order.
3.2.8 DECstation 325
C
/ 333
C
Math Coprocessor
Replacement
Replace the math coprocessor as follows:
1. Remove the CPU board as described in Section 3.2.7.
2. Locate the math coprocessor on the CPU board (Figure 3–5).
3. Remove the coprocessor using a small, flat-blade screwdriver
to alternately lift each end. While lifting the coprocessor out
of the socket be careful not to damage the socket or bend any
of the pins on the coprocessor.
4. Before installing the new math coprocessor, straighten any
pins so they align with the holes in the socket.
5. Make sure pin 1 of the coprocessor aligns with pin 1 of the
socket. Pin 1 is located in the upper right corner (Figure 3–5).