Dell OptiPlex 5055 Ryzen APU Tower Owner's Manual

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System board jumper setting

The service system board jumper must be set to PW_CLR to function normally. Jumper will be parked at " PW_CLR " for both production and service motherboard by the default. The issue of cycling reboot will occurred if the technician or customers did not place the jumper back to " PW_CLR " after clearing CMOS.

System Board Jumper Settings

Table 1. System board jumper detailsSystem board jumper details
SERVICE_MODE	1-2 Short: Disable
	1-2 Open: Default
CMOS_CLR	3-4 Short: CMOS Clear
	3-4 Open: Default
PW_CLR	5-6 Short: Default
	5-6 Open: Password: Reset