Lenovo 70B4, User Manual And Hardware Maintenance Manual

Page: 65 / 246

The following illustration shows the status of the jumpers and switches on the system board of your server.
You can configure, recover, enable, or disable some specific features of the system board by setting the
jumpers or moving the switches.
Figure 31. System board jumpers and switches
Table 2. System jumpers
1
ThinkServer Management Module Enable/Disable jumper
3
Switches
2
Clear CMOS (Complementary Metal Oxide Semiconductor) jumper
Attention: To set the jumpers or move switches, you need to remove the server cover to access the system
board. Do not open your server or attempt any repair before reading and understanding “Safety information”
on page iii and “Guidelines” on page 83.
1
ThinkServer Management Module Enable/Disable jumper
When the ThinkServer Management Module Enable/Disable jumper (hereinafter referred to as the TMM
Enable/Disable jumper) is in the default normal position (pin 1 and pin 2), the server needs about 30 seconds
for the TMM to initialize whenever you connect the server to an ac power source. If you press the power
switch on the front panel during this period, the server will not start immediately; it will start after the TMM
initialization finishes. The TMM function is available in this situation.
If you move the TMM Enable/Disable jumper to pin 2 and pin 3, the TMM function is not available and the
server is turned on directly when you press the power switch without waiting for the TMM to be ready.
Chapter 3
.
Product overview
53