Ricoh mp 7502 overtoning - light image

[doro]

Hello to everyone!
I bought and sell a used RICOH MP 7502 last month ( counter 890.000 copies) .
I changed all PM (drum,developer, tranfer belt,brush, grid ,blades seals etc..) all OEM.
I did initialization settings as always 2-801, 2-962 .The print quality after a few thousand prints ( 5000 - 7000 pages !!)
has become light and in Drum stay entrance there is too much toner.
I changed developer again and the problem continues...
Auto Process Control is ON ( SC History was once SC380-41)
Dev.bias: 515 V
Toner supply mode:2-208 is 0 (sensor control) is default
Toner supply rate: 2-209 is default
Vref nanual setting: 1.02 (default is 2.5)
Vt display: 0.6
any ideas???please help!!
Thanks!

[doro]

Re: Ricoh mp 7502 overtoning - light image

Toner is 9002 OEM

[anothertech]

Re: Ricoh mp 7502 overtoning - light image

Look this tech pub over, could help.

Light Images.pdf

[slimslob]

Re: Ricoh mp 7502 overtoning - light image

If by OEM you mean Genuine Ricoh, I would say that you have a dirty ID sensor. The term OEM means that it is made to the original equipment manufacturer's published specifications. Manufacturers do not publish their inspection and other quality control procedures.

[KeviM]

Re: Ricoh mp 7502 overtoning - light image

Hello

Agreed with Slimslob, you may have a dirty sensor.

Also that technical update that Anothertech supplied is excellent.

I would like to add,

1) Your readings are off. Do have a note of what the readings was when you changed the drum, developer,filters,...etc.?
2) Did you try perhaps swapping the drum and developer units and checking what readings you get and how the machine does after a long run?
3) This is a bit of a long shot but what's the condition of your transfer unit?
4) I hope it is original parts as others brands can cause this same problem. I have experienced it before. And its more expensive in the long run when not using original parts.

Let us know how it goes and I hope this helps.

All the best friend

[doro]

Re: Ricoh mp 7502 overtoning - light image

I noticed that the previous technician had done memory clear. All values in sp mode was default.
Fortunatly i found the ''birth certification'' attached behind the frond door.
I input the values according the birth certificate, but nothing changed in print quality.
I didn't change anything ( drum, developer) yet.
I dont know why the previows tecnician done memory clear.. maybe by mistake or tried to solve the same print quality problem
of overtoning??
Any suggestions about the procedure that i have to do???
thanks again

[slimslob]

Re: Ricoh mp 7502 overtoning - light image

I noticed that the previous technician had done memory clear. All values in sp mode was default.
Fortunatly i found the ''birth certification'' attached behind the frond door.
I input the values according the birth certificate, but nothing changed in print quality.
I didn't change anything ( drum, developer) yet.
I dont know why the previows tecnician done memory clear.. maybe by mistake or tried to solve the same print quality problem
of overtoning??
Any suggestions about the procedure that i have to do???
thanks again

I will say again, you most likely have a dirty ID, Image Density, sensor. You can check it with SP 3001-1. It should be close to the default of 70. If it is too high you WILL get light images. My guess is that it will be over 150 possibly between 200 and 250. You have already stated that there was toner scattering in the Drum stay entrance so you most likely have it in the drum stay below the cleaning station which is where the ID sensor is located.

Precautions when cleaning the ID sensor:

1. [*=1]Vacuuming can cause static that can damage the sensor. Use a camera lens brush to remove tone on the sensor and for at least 10mm to each side.
   [*=1]Wiping with some fabrics can also cause static
   [*=1]Most glass cleaners will cause filming that can adversely affect the sensor.
   [*=1]Many solvents can damage the surface of the sensor
   [*=1]Use only a soft cotton cloth moistened slightly with water only

Once the sensor has been cleaned, run SP 3001-2 to calibrate the sensor. If you still get a high value for SP 3001-1, replace the sensor.

[apump]

Re: Ricoh mp 7502 overtoning - light image

replace the dev assy. had this couple of months ago.

[doro]

Re: Ricoh mp 7502 overtoning - light image

I will say again, you most likely have a dirty ID, Image Density, sensor. You can check it with SP 3001-1. It should be close to the default of 70. If it is too high you WILL get light images. My guess is that it will be over 150 possibly between 200 and 250. You have already stated that there was toner scattering in the Drum stay entrance so you most likely have it in the drum stay below the cleaning station which is where the ID sensor is located.

Precautions when cleaning the ID sensor:

1. [*=1]Vacuuming can cause static that can damage the sensor. Use a camera lens brush to remove tone on the sensor and for at least 10mm to each side.
   [*=1]Wiping with some fabrics can also cause static
   [*=1]Most glass cleaners will cause filming that can adversely affect the sensor.
   [*=1]Many solvents can damage the surface of the sensor
   [*=1]Use only a soft cotton cloth moistened slightly with water only

Once the sensor has been cleaned, run SP 3001-2 to calibrate the sensor. If you still get a high value for SP 3001-1, replace the sensor.

id sensor value sp 3001-1 is 56. this value is ok.
all the machine cleaned very well 2 times last week.

[doro]

Re: Ricoh mp 7502 overtoning - light image

replace the dev assy. had this couple of months ago.

why do you thing should i replace development unit?
magnetic roller is also cleaned like new one.

[anothertech]

Re: Ricoh mp 7502 overtoning - light image

why do you thing should i replace development unit?
magnetic roller is also cleaned like new one.

Did you read the tech pub I posted? It said to check the serial number on the developer unit.

[slimslob]

Re: Ricoh mp 7502 overtoning - light image

Did you read the tech pub I posted? It said to check the serial number on the developer unit.

Maybe if apump had referenced the bulletin you posted his recommendation may have made sense.

[doro]

Re: Ricoh mp 7502 overtoning - light image

Did you read the tech pub I posted? It said to check the serial number on the developer unit.

i read the bulletin guys and i will check the serial and all instruction.
just i think that perhaps memory clear responce for the problem.
I think to replace developer only once again and maybe potential.
For the potenntial i a not sure becauce auto process control stays on.
i think that when a potential sensor defective, the Auto Process Control On/Off Setting
sets automatically off (0). But in SC history there is twice 380-41 Potential sensor calibration error (VD).
I am confused because the customer prints 90.000 -120.000 a4 per month...
I have to find solution quickly..

[slimslob]

Re: Ricoh mp 7502 overtoning - light image

I am confused because the customer prints 90.000 -120.000 a4 per month...
I have to find solution quickly..

I think we have found the problem. According to the Product Support Guide, the recommended average monthly volume for the MP 7502 is 40K. You are talking 2 to 3 times that amount. At that volume your customer should be using a Production model in the 110 to 125 ppm speed range.

At that volume the development unit is running excessively enough that it is gassing toner out faster than the development filter can keep up with. In addition to toner scattering in the PCU frame you might have a tone film building up on the laser shield glass. It can be pulled out the front and cleaned with a dust cloth. If it is missing then you could have toner getting into the laser unit.

[doro]

Re: Ricoh mp 7502 overtoning - light image

At that volume the development unit is running excessively enough that it is gassing toner out faster than the development filter can keep up with. .

are there any settings in sp mode that i can do??

in another mp 7500 with long runs and 70000+ pages per month there is no problem like that.