HP 4101mfp See Basic troubleshooting on, and Power-on defects on, Supply on page 63 and Power-on

Table 19. Troubleshooting copy processor board LEDs

LED pattern	Control panel display	MFP functionality	Action
(LJ4100mfp and
LJ4101mfp only)
OFF OFF OFF OFF	None (no power)	● Print (a configuration page)-no	1.	Verify the MFP power is turned on
		● Copy (from the ADF or glass)-no	(see “Basic troubleshooting” on
		● Send (digital sending)-no	page 114 and “Power-on defects” on
			page 116).
			2. Verify that the MFP is plugged into
			a working power source.
OFF OFF OFF OFF	Alternates between Power	Select OK, then attempt to	1.	Reseat the CPB.
	and Check Cables And Cycle	● Print (a configuration page)-no	2. Turn the MFP power off, then back
	Power	● Copy (from the ADF or glass)-no	on again.
		● Send (digital sending)-no	3.	Verify that the scan unit power
			supply is functional (see “Power
			supply” on page 63 and “Power-on
			defects” on page 116).
ON* OFF ON ON	READY, POWERSAVE ON,	● Print (a configuration page)-yes	Normal ready state. No action
*Flashing	or PAUSED	● Copy (from the ADF or glass)-yes	required. For information about the
		● Send (digital sending)-yes	PAUSED or POWERSAVE ON
			modes, see the hint in “Using the
			control panel” on page 30.
ON* OFF ON OFF	Alternates between Power	Select OK, then attempt to	1.	Verify that the high-speed copy
*Flashing	and Check Cables And Cycle	● Print (a configuration page)-yes	connect cable is fully seated at both
OR	Power	● Copy (from the ADF or glass)-no	ends (see “Copy processor board” on
		● Send (digital sending)-no	page 83 and “Formatter cage” on
			page 87).
OFF OFF ON OFF			2. Turn the MFP power off, then back
			on again.
			3.	Replace the high-speed copy
			connect cable.
ON* ON ON ON	Alternates between Power	Select OK, then attempt to	1.	Reseat the firmware DIMM (see
*Flashing	and Check Cables And Cycle	● Print (a configuration page)-yes	“Copy processor board” on page 57).
	Power	● Copy (from the ADF or glass)-no	2. Turn the MFP power off, then back
		● Send (digital sending)-no	on again.
ON** ON ON ON	Alternates between Power	Select OK, then attempt to	1.	Reload the MFP firmware (see
**Dimly lit LED	and Check Cables And Cycle	● Print (a configuration page)-yes	“Downloading a remote firmware
	Power	● Copy (from the ADF or glass)-no	update” on page 41).
		● Send (digital sending)-no	2.	Replace the firmware DIMM (see
			see “Copy processor board” on
			page 57).
ON ON ON ON	Alternates between Power	Select OK, then attempt to	1.	Reseat the memory DIMM (see
	and Check Cables And Cycle	● Print (a configuration page)-yes	“Copy processor board” on page 57).
	Power	● Copy (from the ADF or glass)-no	2.	Verify that the memory DIMM is a
		● Send (digital sending)-no	16MB DIMM.
			3.	Replace the memory DIMM.
			4.	Reseat the firmware code DIMM.

Note

Hint

If the CPB failure persists after all attempts to troubleshoot the problem, replace the CPB.

The LED patterns an HP LaserJet 4100/4101mfp displays are the opposite of those on the HP LaserJet 9000mfp because of how the CPBs are mounted. The CPB is mounted upside down in the HP LaserJet 9000mfp.

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