Lenovo 3821, 3822, 3719, 3823 manual JP1

System-board switches and jumpers

The following illustration shows the switches and jumpers on the system board.

See Table 9 and Table 10 for information about the switch and jumper settings.

		Table 9. System-board jumpers
		Jumper	Jumper
		number	name	Jumper setting
		JP1	CMOS clear	v Pins 1 and 2: Normal operation (default).
				v Pins 2 and 3: Clears CMOS memory.
		JP6	UEFI boot	v Pins 1 and 2: Normal operation (default).
			recovery	v Pins 2 and 3: Enable the UEFI recovery mode.
		Note: If no jumper is present, the server responds as if the jumper is on pins 1 and 2.
Table 10. System-board switch 6
SW 6 Switches	Switch description
1	Reserved (default off)
2	Power-on password override when on. (default off)
3	Reserved (default off)
4	When this switch is off, the primary IMM firmware ROM page is loaded. When this switch is on,
	the secondary (backup) IMM firmware ROM page is loaded. (default off)

Notes:

1.Before you change any switch settings or move any jumpers, turn off the server; then, disconnect all power cords and external cables. (Review the information in Chapter 2, “Safety information,” on page 5.)

2.Any system-board switch or jumper blocks that are not shown in the illustrations in this document are reserved.

144ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual