03-20-2011 07:05 AM
we have a 4100MFP. A few weeks ago, we use the maintenance kit. After a while, the control panel / display failed.
We have another 4100MFP, fallen down, and I have changed most of the parts (panel itself, platine in scanner). No change. Any idea, cause without control panel we can`t use the LaserJet.
The next problem. We use a brandnew HP toner cartridge but it told me only 4 % toner. So I change. Same only 4% toner and it asked for the service (we have done a few weeks ago).
03-20-2011 05:41 PM
If the formatter swap doesn't work, there is a small PCB under the top cover that the toner door/control panel plugs into. You might want to swap that next. Also, double check all connections. Had one that twisted my tail and it turned out to be a loose connection. good luck.
03-20-2011 11:54 PM
It's the most common fault we see on this printer.
RG1-4175-000CN is the psu spares code.
The fuse for it is VD7-0644-000CN, in many cases the fuse itself goes but we find 50/50, some will blow the fuse again if we replace it.
(Don't forget Kudos if people have helped)
03-21-2011 01:47 AM
thank you for answering. My english is horroble, but I try. I changed everythink, but the small PCB under the top cover that the toner door/control panel plugs into.
All connection I have checked und changed the Scanner psu (it is on the back with the connection cable to the scanner?).
So last chance is the small PCB. IS THERE A WHITEPAPER, how to change?
After my doings, the damaged Printer is o.k. now :-) If it is the PCB, what`s part number and what`s the price?
03-21-2011 05:03 AM
Service manual can be downloaded free here:
03-21-2011 07:19 AM
thank you. I have read a lot. All the
copy processor board LEDs are off.
Is this a good or a bad information. After the display is off, we havn`t use it for scanning or fax. So I havn`t controll the scanner.
03-21-2011 07:55 AM
All the CPB LEDs off would most likely indicate a power problem - as Kevin has said in a previous reply you need to try swapping this - from your earlier reply, I think you have changed the wrong part - use the Service guide and the pictures to identify the PSU.
Good luck - regards,
03-21-2011 08:13 AM
03-22-2011 03:26 AM
here a two pictures. You can`t see the platine. It is a small piece with cables. Pictures next times
Now I have one more problem. I told you, that the damaged printer now works. But it ask me for a User an Password (see screenshot).
03-22-2011 03:49 AM
03-22-2011 04:18 AM
Yes - a cold reset will set everything back to default including the IP address - you will have to re-input all the previous setup values.
PS - it is always a good idea to print a configuration page before the above....