NEC POWERMATE ES 5250 - S, Руководство по обслуживанию

Страница: 14 / 56

2-4 System Boards
Setting CMOS Clear Jumper JBAT1
If the CMOS needs to be cleared and reset back to the factory settings, move the
jumper from pins 1 and 2 to 2 and 3 on jumper block JBAT1 (see the following
table for settings). After approximately five seconds, move the jumper back to
pins 1 and 2 to keep any future CMOS changes.
CMOS Clear Jumper JBAT1 Settings
JBAT1 Pins Function
1-2 Jumpered Factory setting. Keeps CMOS changes.
2-3 Jumpered Clears CMOS changes.
Setting Onboard Video Jumper JVGA1
If adding a video board to the system, the onboard video must be disabled by
moving the jumper from pins 1 and 2 to pins 2 and 3 on jumper block JVGA1
(see the following table for settings).
Onboard Video Jumper JVGA1 Settings
JVGA1 Pins Function
1-2 Jumpered Factory setting. Enables onboard video.
2-3 Jumpered Disables onboard video.
Setting CPU Bus Frequency Selector Jumper JK1
Enables automatic detection of the CPU bus frequency (66 MHz or 100 MHz)
when pins 1 and 2 are jumpered on jumper block JK1. When the jumper is
removed from JK1, the system automatically sets the CPU bus frequency to
100 MHz (see the following table for settings).
CPU Bus Frequency Selector Jumper JK1 Settings
JK1 Pins Function
1-2 Jumpered Factory setting. Enables auto detection of 66-MHz
and 100-MHz frequencies.
1-2 Not Jumpered Sets CPU bus frequency to 100 MHz.