Changing Processor Jumper Settings - NEC POWERMATE V Service Manual

B-2 System Board Jumpers

CHANGING PROCESSOR JUMPER SETTINGS

Use the following procedure when replacing the installed processor with a faster speed
processor. Jumpers requiring setting changes include the Processor/Bus Speed and ATCLK
jumpers.
1. Turn off and unplug the system and any connected external options.
2. Remove the system unit cover (see Section 3, Option Installation, for cover
removal).
Replace the processor (see Section 3 for processor upgrade procedures).
3.
Remove any expansion boards blocking access to the jumpers.
4.
5. Locate the Processor/Bus Speed, ATCLK, and Processor Voltage jumper blocks
on the system board (see Figure B-1).
6. Set the Processor/Bus Speed and ATCLK jumpers per Figure B-2 and
Figure B-3.
7. Set the Processor Voltage jumper (see Figure B-2 and Figure B-3) on the system
board as follows:
WARNING: System power must be off before
removing the cover and changing a jumper
setting.
CAUTION: Unless updating the processor,
leave the processor jumpers at the factory
setting. Changing the settings jumpers could
damage the processor.
NOTE: System boards have either one or two
BF processor jumpers. The system board with
two BF jumpers are labeled BF0 and BF1 (see
the following figures).