Changing Processor Jumper Settings - NEC POWERMATE P - SERVICE MANUAL 1996 Service And Reference 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.
Locate the Processor/Bus Speed, ATCLK, and Processor Voltage jumper blocks
5.
on the system board (see Figure Appendix B-1).
6. Set the Processor/Bus Speed and ATCLK jumpers per Figure Appendix B-2.
7. Set the Processor Voltage jumper (see Figure Appendix B-2) on the system
board as follows:
n
For the 150-MHz processor (60-MHz clock speed), set the jumper on the VR
block (3.38 volts)
n
For the 166-MHz processor (66-MHz clock speed), set the jumper on the
VRE block (3.52 volts)
Reinstall any removed expansion boards.
8.
Reinstall the system cover.
9.
10. Reconnect any disconnected peripherals and turn on the system.
WARNING: System power must be off before
removing the cover and changing a jumper
setting.
CAUTION: Unless updating the processor to a
faster speed, leave the Processor Voltage jumper
and Bus/Core jumper at the factory setting.
Changing the Voltage and Bus/Core jumpers
could damage the processor.