HP LaserJet 4101mfp Copy processor board LEDs, Hint, Note, CPB status, LED pattern, Figure 22. Copy processor board LEDs

	Copy processor board LEDs
	The CPB has four light-emitting diodes (LEDs) that can be viewed when you face the back of the
	MFP (callout 1). These LEDs illuminate in specific patterns depending on the CPB status during
	initialization (initialization occurs when power to the MFP is turned on). After initialization, the
	LEDs can be used to troubleshoot the CPB (see “Troubleshooting with the copy processor board”
	on page 124).The table in this section describes the LED pattern sequences during the first and
	second stage of CPB initialization.
Hint	The LEDs can be difficult to see through the holes provided in the CPB faceplate (callout 1) in a
	high-light environment. It might be necessary to turn off some lights or remove the faceplate to
	see the LEDs.
	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.

1

Figure 22. Copy processor board LEDs

Table 9. Copy processor board LEDs (initialization sequence)

LED pattern		CPB status
First stage of CPB initialization
ON* ON* ON ON		● CPB flash DIMM detected
*LEDs might flash		● CPB RAM DIMM detected
		● CPB processor is working
before coming to a solid
		● CPB has communication with the ASIC
illuminated state
Note	If CPB initialization stops and the LEDs stay in the continuously illuminated
	state, a CPB failure has occurred (for example, a memory DIMM is not
	present or fully seated). To troubleshoot a CPB failure, see “Troubleshooting
	with the copy processor board” on page 124.

C9148-90909 5 Theory of operation 59