NEC POWERMATE PROFESSIONAL - SERVICE MANUAL 05-1997 Service Manual page 193

1. Power off and unplug the system and any peripherals.
2. Remove the system unit cover (see "Removing the System Unit Cover" in
Section 3).
Locate these jumpers on the system board (see "System Board Jumper Locations"
3.
in the previous subsection).
You may have to remove any installed expansion boards to access the jumpers
4.
(see "Removing Expansion Boards" in Section 3).
5. Check the processor/bus speed jumper setting against the following figure. If
necessary, change the jumper setting by lifting the plastic block and placing it on
the appropriate pins.
NECCSD recommends using needle-nose pliers to move a jumper.
Processor/Bus Speed
233-MHz Processor/
66-MHz Bus Speed
266-MHz Processor/
66-MHz Bus Speed
Jumpers also set PCI and ISA bus
frequencies and bus/processor
frequency ratios.
Reinstall any removed expansion boards (see "Removing Expansion Boards" in
6.
Section 3).
Replace the system unit cover (see "Replacing the System Unit Cover" in
7.
Section 3).
Power on the system.
8.
Jumpers
A
B
C
Jumpers
A
B
C
Figure B-2 Processor Settings
System Board Settings
4
2
5
3 6
4
1
2
5
3
6
4
1
2
5
3
6
4
2
5
3
6
4
1
2
5
3
6
4
1
2
5
3
6
B-5