HP m775 faint copies and prints

[londoner]

Hi guys,

I have a very odd problem on a m775, all copies and prints are noticeably faint but prints from the engine are fine.
I have swapped the drums, transfer, formatter, dc controller and flashed and re-flashed firmware.
I have raised a ticket with HP but they have not been able to help.
I am not sure where else to try, whats throwing me is that the internal prints all come out fine.

Any ideas would be very welcome

[Phil B.]

Re: HP m775 faint copies and prints

Hi guys,

I have a very odd problem on a m775, all copies and prints are noticeably faint but prints from the engine are fine.
I have swapped the drums, transfer, formatter, dc controller and flashed and re-flashed firmware.
I have raised a ticket with HP but they have not been able to help.
I am not sure where else to try, whats throwing me is that the internal prints all come out fine.

Any ideas would be very welcome

generic toners?

[londoner]

Re: HP m775 faint copies and prints

Toners are oem

[Phil B.]

Re: HP m775 faint copies and prints

Toners are oem

did you clean the laser lens?
did you calibrate the toner when inserted?

you need to state everything tried/replaced in the OP

[Lance15]

Re: HP m775 faint copies and prints

Have you hooked your laptop up to the unit and installed the latest UPD driver (I suggest the PCL driver)? How do prints from a KNOWN GOOD laptop look?

[Phil B.]

Re: HP m775 faint copies and prints

Have you hooked your laptop up to the unit and installed the latest UPD driver (I suggest the PCL driver)? How do prints from a KNOWN GOOD laptop look?

Lance he 'says' internal prints ok but Copy and Print are washed... hopefully he hasn't got a WSD or non HP driver installed..
but its like pulling teeth

[Lance15]

Re: HP m775 faint copies and prints

Yeah, I asked that because it sounds like his issue is possibly OUTSIDE of the printer.

Internal Prints, to me, means:
Menu Map
Configuration Page
PQ pages
Engine

etc, etc

[londoner]

Re: HP m775 faint copies and prints

Hi,

sorry for not being clearer

Toners are oem

Sorry for the short reply but I had just left a customer at almost 20:00 and was trying to get home.

Have you hooked your laptop up to the unit and installed the latest UPD driver (I suggest the PCL driver)? How do prints from a KNOWN GOOD laptop look?

First thing I tried still faint on prints.


Internal Prints, to me, means:
Menu Map
Configuration Page
PQ pages
Engine

etc, etc

That's exactly what I mean by internal prints.


did you clean the laser lens?
did you calibrate the toner when inserted?

sorry missed this in the first post, yes i cleaned the laser and calibrated I also replaced the HDD, transfer roller and the itb calibration sensors and swapped the scan pwb as a long shot and removed the optional trays.

The customer has multiple m775's and all use the same driver but only this one has a problem.

Everything prints fine from the engine but when printing from any pc running either windows or linux or copying the prints are noticeably faint.

It would make sense if everything was faint or if only prints or only copies were but all the internal prints are fine so it cant be an issue with the lsu, transfer, drums ect, copies are bad so it cant be a external problem and prints are bad so it cant be a scanner issue.

When scanning to usb or email everything is fine.

Sorry if I missed anything out, please ask for any information.

Thanks for taking the time to help

[Lance15]

Re: HP m775 faint copies and prints

Can you post some samples? This doesn't make any sense at all. If internal prints are fine, then, anything printed TO the unit should be fine. Very strange.......

[Phil B.]

Re: HP m775 faint copies and prints

Can you post some samples? This doesn't make any sense at all. If internal prints are fine, then, anything printed TO the unit should be fine. Very strange.......

+1

[Downunder]

Re: HP m775 faint copies and prints

Its not toner save mode like on brothers?

[tsbservice]

Re: HP m775 faint copies and prints

+1 for toner save. I had some head scratching moments due to toner save modes in the past with various makes and models. Lessons well learned when it comes to such 'strange' situations.

[LATechnico]

Re: HP m775 faint copies and prints

Did you figure this out? I have a similar issue. Cleaned the laser unit, toners are new OEM, Transfer belt is at 50% life. I'm getting the 54.0D.00 thru 54.0D.03 calibration error errordiffusion, also the 54.0C.00 thru 54.0C.03 calibration error consecutive DmaxDhalf every time it calibrates. Any help will be appreciated, thanks in advance.

[theengel]

Re: HP m775 faint copies and prints

It looks like the very last post indicates the problem was that it is in toner save mode.

It looks like the machine is fine printing black, but has trouble printing grays. That would indicate either being in toner save mode, or something to do with mid shades.

[LATechnico]

Re: HP m775 faint copies and prints

It turned out to be the transfer belt. Replaced it and ran the calibration, no more error codes and the print quality is back to normal. Hope this helps.
Thanks!