HP LASERJET RESOURCES

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Avoid Troubleshooting with Formatters, DC Controllers

HP LaserJets produced since 2004 sometimes use the same formatter and/or dc controller board in multiple printer models. The identity of the printer (which model it is, whether or not it has network capability, whether or not it has duplex capability, etc.) is written into NVRAM memory on both boards. When you replace either of these boards, it automatically copies that information (along with menu settings, page counts, etc.) from the other board. This works well as long as the board being installed is a brand new OEM board (never been installed in a printer) with a blank NVRAM.

If the board being installed has been taken from another printer and has data in the NVRAM, the printer doesn’t know which direction to copy, and the results are unpredictable – the identity of the printer may be changed, and there is no easy way to change it back. There are procedures (usually involving an NVRAM initialization and/or a 5-minute waiting period on first power-up with the new board) that can minimize the chance of a downgrade, but if the two boards have different identities, one of them will change in any event.

On the printers that copy information between formatter and dc controller, HP warns against replacing both boards at the same time – because all the information (page counts, menu settings, etc.) will be lost. Even if both boards are bad and need to be replaced, it is best to do one at a time and perform the appropriate procedures separately for each board.

The moral of all this is: do not swap formatters and dc controllers between machines for troubleshooting purposes unless you must, and then be aware that it may cause identity problems. And do not remove both boards at the same time.

*LJ 4240/50, 4350, 2410/20/30/40, P3004/5, M3027, M3035, P4014/15 and 4515, and other printers released in the past 5-8 years. The 9050 and 9050MFP service manual warns not to remove the dc controller and formatter simultaneously, but whether there are potential identity issues with these models is not yet confirmed. Call LPT Tech Support if you have a question about a specific model not mentioned.

 

mementoart

Avoid Troubleshooting with Formatters, DC Controllers

HP LaserJets produced since 2004 sometimes use the same formatter and/or dc controller board in multiple printer models. The identity of the printer (which model it is, whether or not it has network capability, whether or not it has duplex capability, etc.) is written into NVRAM memory on both boards. When you replace either of these boards, it automatically copies that information (along with menu settings, page counts, etc.) from the other board. This works well as long as the board being installed is a brand new OEM board (never been installed in a printer) with a blank NVRAM.

If the board being installed has been taken from another printer and has data in the NVRAM, the printer doesn’t know which direction to copy, and the results are unpredictable – the identity of the printer may be changed, and there is no easy way to change it back. There are procedures (usually involving an NVRAM initialization and/or a 5-minute waiting period on first power-up with the new board) that can minimize the chance of a downgrade, but if the two boards have different identities, one of them will change in any event.

On the printers that copy information between formatter and dc controller, HP warns against replacing both boards at the same time – because all the information (page counts, menu settings, etc.) will be lost. Even if both boards are bad and need to be replaced, it is best to do one at a time and perform the appropriate procedures separately for each board.

The moral of all this is: do not swap formatters and dc controllers between machines for troubleshooting purposes unless you must, and then be aware that it may cause identity problems. And do not remove both boards at the same time.

*LJ 4240/50, 4350, 2410/20/30/40, P3004/5, M3027, M3035, P4014/15 and 4515, and other printers released in the past 5-8 years. The 9050 and 9050MFP service manual warns not to remove the dc controller and formatter simultaneously, but whether there are potential identity issues with these models is not yet confirmed. Call LPT Tech Support if you have a question about a specific model not mentioned.

Avoid Troubleshooting with Formatters, DC Controllers

HP LaserJets produced since 2004 sometimes use the same formatter and/or dc controller board in multiple printer models. The identity of the printer (which model it is, whether or not it has network capability, whether or not it has duplex capability, etc.) is written into NVRAM memory on both boards. When you replace either of these boards, it automatically copies that information (along with menu settings, page counts, etc.) from the other board. This works well as long as the board being installed is a brand new OEM board (never been installed in a printer) with a blank NVRAM.

If the board being installed has been taken from another printer and has data in the NVRAM, the printer doesn’t know which direction to copy, and the results are unpredictable – the identity of the printer may be changed, and there is no easy way to change it back. There are procedures (usually involving an NVRAM initialization and/or a 5-minute waiting period on first power-up with the new board) that can minimize the chance of a downgrade, but if the two boards have different identities, one of them will change in any event.

On the printers that copy information between formatter and dc controller, HP warns against replacing both boards at the same time – because all the information (page counts, menu settings, etc.) will be lost. Even if both boards are bad and need to be replaced, it is best to do one at a time and perform the appropriate procedures separately for each board.

The moral of all this is: do not swap formatters and dc controllers between machines for troubleshooting purposes unless you must, and then be aware that it may cause identity problems. And do not remove both boards at the same time.

*LJ 4240/50, 4350, 2410/20/30/40, P3004/5, M3027, M3035, P4014/15 and 4515, and other printers released in the past 5-8 years. The 9050 and 9050MFP service manual warns not to remove the dc controller and formatter simultaneously, but whether there are potential identity issues with these models is not yet confirmed. Call LPT Tech Support if you have a question about a specific model not mentioned.

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