In HP 3525 printer manual is the CPR sensor/ Density Detect Sensor, RM1-4953-000CN the same part?

[Jerry59-41]

The printer event log reports:  the CPR sensor is out of range -- codes 54.0F 01, 02, 03 and 04 .

The problem I am faced with is there is NO CPR sensor identified in the components parts part of the maintenance  manual.

HP Service manual, p 401:

• Code 54.0F;

• Code 54.14 states to use the following diagnostic sequence:

1. Press the Menu button.

2. Press the down arrow to highlight

CONFIGURE DEVICE, and then

press the OK button.

3. Press the down arrow to highlight

PRINT QUALITY, and then press

the OK button.

4. Press the down arrow to highlight

FULL CALIBRATE NOW, and then

press the OK button.

5. If the error persists, replace the

CPR sensor assembly.

My question is: Registration Density (RD) Detect Sensor the part that needs to be replaced?

see 462-463 of HP Service manual.

[Repairatrooper]

Before you start changing parts, ensure that all your cartridges are functioning properly. A bad cartridge will cause this error, as will a dirty density sensor. These sensors read the toner patterns printed on the transfer belt when a calibration cycle occurs. Open the right door, drop the transfer roller and remove the transfer belt. Density sensors are circled in red.

[Jerry59-41]

Hi, Thanks for the response.  I swapped ALL the toner cartridges with a set from a printer that was working.  The swapped out cartridges work fine in the other printer, so I presumed that eliminated the cartridges from being the source of the problem.

Next, I swap  out the Density Detect Sensor with a refurbished one, and it did not change the information reported in the event log:  the CPR sensor is out of range -- all four codes 54.0F 01, 02, 03 and 04  continue to be reported after the  full calibration was repeated after boot up of the device.  However, as I understand the HP manual these codes SHOULD NOT block printing, but the printer fails to print when plugged into the computer (while my other CP3525n printer prints fine when connected to the same computer).

The faulty CP3525n printer prints the event log just fine, and the colored print calibration printout looks fine -- NO distortion  of the grid, lines in printed image, spacing, or missing pixels.  The printed pages look like the HP Maintenance Manual reference pages look.

Can you recommend a diagnostic procedure that might help isolate the problem -- e.g. turn of the toner cartridge sensors; or diagnostics for individual sensors that might cause the diagnostic reports.  I am trying to wade through the HP Maintenance manual, but have no formal technical training on the CP3532n printer.  

I appreciate your time and interest in helping me.

Jerry