Maintenance and Service Guide

Table Of Contents
System board connectors
Refer to the following illustration and table to identify the system board connectors for your model.
Table 4-1 Identifying system board connectors
Callout Label Component Callout Label Component
(1) PWRCPU 4-pin processor power (14) WIRELESS WLAN module
(2) XU1 Processor (15) SATA PWR0 Drives
(3) CPUFAN Processor fan (16) SD RDR Card reader
(4) DIMM1 Memory module (17) SATA0 Hard drive
(5) DIMM2 Memory module (18) SATA2 Any SATA Device other than
primary hard drive
(6) DIMM3 Memory module (19) SATA1 Any SATA device other than
primary hard drive
(7) DIMM4 Memory module (20) PSWD Clear system passwords
(8) HSENSE Hood sensor (21) BIOS BATTERY RTC battery
(9) SPKR Speaker (22) CMOS Reset CMOS
(10) SSD2 M.2 solid-state drive (23) X16PCIEXP Expansion card
(11) SSD1 M.2 solid-state drive (24) X1PCIEXP1 Expansion card
(12) PWR 6-pin main power (25) COM Option port
(13) PWRCMD Power supply (26) COMA Optional second serial port
System board connectors 27