Sony PCV-E314DS - Manual (Page 77)

System Board 69
BIOS Recovery and Clear CMOS
The computer is shipped with an unused jumper cap on pins 2 and 3 (pin
3 is floating) for use by service personnel only. The jumper cap should
remain in this inactive position unless otherwise directed by a technical
support person.
JP2
Jumper Cap
Description
1 - 2 BIOS recovery mode
2 - 3 Normal mode
JP4
Jumper Cap
Description
On CMOS clear mode
Off Normal mode
KY0059.VSD
JP4
1 2
CLEAR
CMOS
JP2
BIOS
RECOVERY
1 2 3