MP 301SPF Toner Density/High Background

**JaysOnTheEDGE** · 10-30-2020

Originally Posted by Polo-022

Could it be the TD sensor, calibrated to a "higher density" level related to the MP201sp TD sensor??

The toner formulation is different between the 2 series so its a possibility, I do not miss working on these though I went through so many PCDU units such a environmental waste.

**Brianneoe** · 10-31-2020

The toner hopper is a major point of failure with these machines. If the toner hopper is defective you will see toner all the way down the bottle when you remove the bottle and the discharge lamps above the PCU will be coated with toner. When the hoppers are working as they should the machine will run clean and you will get a better yield from the PCU.

**mga** · 10-31-2020

Originally Posted by Brianneoe

The toner hopper is a major point of failure with these machines. If the toner hopper is defective you will see toner all the way down the bottle when you remove the bottle and the discharge lamps above the PCU will be coated with toner. When the hoppers are working as they should the machine will run clean and you will get a better yield from the PCU.

This machine don't have discharge lamps

**anothertech** · 11-01-2020

Originally Posted by mga

This machine don't have discharge lamps

Looks like he's refering to the quenching lamps. They do get covered with toner. I never thought of replacing the hopper to help with this problem, sounds like a good tip.

**Gab** · 11-01-2020

usually this probles is coused when developer is fatigued

**JonManchester** · 11-09-2020

The problem with these PCDU's are due to the fact they are meant to run at 16 pages per minute not 31 pages per minute. That being said we have customers that run low volume and have little issues with these 301 machines. We have customers that run average to high monthly volumes and the PCDU's just cant handle the speed,, Hence forth the reason the mp305 got a completely redesigned PCDU for the speed. This MP301 series has been a joke, that was improperly engineered. We never had these issues on MP161's and they are the same PCDU's structure minus the different mix for the toner and dv. I cant wait till we have no more in the field, due to the amounts of PCDU's we go through.

**Phil B.** · 11-09-2020

Originally Posted by Gab

usually this probles is coused when developer is fatigued

worn out developer would leave WASHED out prints.

**Polo-022** · 11-09-2020

Originally Posted by JonManchester

The problem with these PCDU's are due to the fact they are meant to run at 16 pages per minute not 31 pages per minute. That being said we have customers that run low volume and have little issues with these 301 machines. We have customers that run average to high monthly volumes and the PCDU's just cant handle the speed,, Hence forth the reason the mp305 got a completely redesigned PCDU for the speed. This MP301 series has been a joke, that was improperly engineered. We never had these issues on MP161's and they are the same PCDU's structure minus the different mix for the toner and dv. I cant wait till we have no more in the field, due to the amounts of PCDU's we go through.

I agree with you Jon, with customers running high monthly volume, PCDU's (D127-XXXX or 411844 ) cannot run to life. Gears get stripped too early. It doesn't happens to the predecessors.
This question has been answered.
I would like to have a good print quality for 30K. prints at least, with one PCDU type or another and i know that 411844 Type
runs very good.
So, is it the D127-XXXX itself the early failure with toner density/heavy backgroung, or the toner Type 301, maybe the SP adjustments?
What if i use toner type 201 on MP 301???
Many thanks to all colleagues for your posts...

**copier tech** · 11-09-2020

Originally Posted by JonManchester

The problem with these PCDU's are due to the fact they are meant to run at 16 pages per minute not 31 pages per minute. That being said we have customers that run low volume and have little issues with these 301 machines. We have customers that run average to high monthly volumes and the PCDU's just cant handle the speed,, Hence forth the reason the mp305 got a completely redesigned PCDU for the speed. This MP301 series has been a joke, that was improperly engineered. We never had these issues on MP161's and they are the same PCDU's structure minus the different mix for the toner and dv. I cant wait till we have no more in the field, due to the amounts of PCDU's we go through.

I have about 50 of these in a school all low use & I never have any major issues with them, or the PCDU failing too early however they rarely hit the PM life.

The first signs they need replacing is overtoning. I guess this model was built with budget in mind as this PCDU design has been around for nearly 20 years!

**Klydon** · 11-11-2020

Just to echo the experience of others here along with my own.

In most cases, it simply doesn't matter which PCU you use (411844 or D1272110). The performance of the machine revolves around what the volume is. IF the machine is run at low volume or even close to suggested volume, you hardly ever hear from them and they generally run fairly well. If it gets pushed hard on volume, the PCUs are junk and won't hold up. In addition, the hot roller won't go 90K either like it is supposed to. The running joke here is a 301 PM is a hot roller and PCU.

These machines are so bad, I generally take a PCU and hot roller in on every call on one unless I was just at it. Like many, I can't wait for these suckers to just go away.