Canon ir 5055

[pjdbm]

I have a Canon ir 5055 in the field that shoots blanks with drum pot on and if I turn off drum pot,I get a decent copy (not the greatest density)

Had errors E100/ E61

I replaced:

1)Laser unit
2) HV unit with transformer

machine still shoots blanks with drum pot on. When you go into machine statis it shows that the primary does not fire, all other units voltages are fine.

I took the process unit out and cleaned everything, checked contacts and grounds. Its none of the corona units either.I polished the drum as well.

checked laser shutter action and the cover pin and all is good.

Talked to the folks at NWBS and they say it may be or the next step would be drum pot circuit.

With drum pot off,would this not eliminate the drum pot circuit?

[gensys]

Re: Canon ir 5055

E100 : The BD PCB is faulty/The laser unit is faulty/The laser driver PCB is faulty/The wiring is faulty (short circuit or open circuit)/The DC controller PCB is faulty
　
Main Cause The BD PCB is faulty. The laser unit is faulty. The laser driver PCB is faulty. The wiring is faulty (short circuit, open circuit). The DC controller PCB is faulty.

Mode of Detection
　0001 In 100 msec after the laser drive signal has been generated, the BD signal is not detected 50 times or more within 40 msecs.
　0002　While the laser is on, the BD signal cycle is found to be outside a specific range 10 times or more.

E100-0001 : Error code When power is turned on, the laser scanner motor fails to rotate.

Symptom
When power is turned on, the laser scanner motor fails to rotate, causing error E100-0001.
Description
When power is turned on and the fixing roller temperature reaches 195 C., the laser scanner motor (M15) is supposed to enter the rotation sequence.
E100-0001detection:
When the BD signal has not been detected 50 times or more within 40ms seconds, 100ms after the laser drive signal has been output.
Cause
Laser scanner motor failure
Items to Check
1. In service mode COPIER > I/O > DC-CON > IO-P11 bit4, check that the drive signal is being output. '0': Drive signal ON
2. Check whether 24V is being output from DC controller PCB J116-4. If 24V is being output, the problem may be a laser scanner motor failure.
Field Remedy
Replace laser scanner
FG6-4870　
E061-0001 : Error code When potential control is ON, black copy occers when potential control is OFF or potential sensor is OFF (F-POT-SW).

Symptom
E061-0001 Laser writing error occers when potential control is ON, black copy occers when potential control is OFF or potential sensor is OFF (F-POT-SW).

Description
In the event of a laser output malfunction in the laser scanner unit, E100 is displayed. In this case, the problem occurs when laser light is being output normally but is not reaching the drum surface.

In this machine, potential control (default) is performed when the fixing unit temperature is 150 C. or lower when the main power is switched ON.
Electropotential control can be toggled ON/ OFF in service mode COPIER> OPTION BODY> PO-CNT.

E601-0001 detection :
When the result of potential control is that the white drum surface electropotential (VL2) is around 200V (the electropotential for a solid black image).
E061-0002 detection :
When the drum surface electropotential (VL2) is around 200V (the electropotential for a solid black image) after the primary charging output and laser output used in printing output.


Cause
Laser scanner unit failure.Items to Check
When E061-0001 is displayed when electropotential control is ON, check the following under service mode COPIER> DISPLAY> DPOT>
For each item, the normal values and error values are given below.
'VL1T' copy bright area electropotential target value (Normal 115V Error 115V)
'VL1M' copy bright area electropotential measurement value (Normal 110V Error 368V)
'LLMT' copy laser power voltage control (Normal 0 Error 1)
Because the laser light was not reaching the drum surface during electropotential control, VL1M reached a surface electropotential close to VDM (copy bright area electropotential measurement value and LLMT tries to raise the laser output during electropotential control, so 1 is displayed.
Also, as primary charging bracketing, the electropotential is maintained at more or less the same level, for error or normal, so the following items need to be checked under service mode COPIER> DISPLAY> DPOT> .
'VDT' copy bright area electropotential target value (Normal 390V Error 390V)
'VDM' copy bright area electropotential measurement value (Normal 390V Error 390V)
'PLMT' copy primary charging current control (Normal 0 Error 0)
*If electropotential control is turned OFF in the service mode, errors are more likely to occur when the power is turned on and, when the COPY button is pressed, error E061-0002 is displayed. Note that, in this case, the service modes described above, 'VL1T', 'VL1M and 'LLMT', will display normal values.


Field Remedy
Perform the check and replace the laser scanner unit.
FG6-4870

[pjdbm]

Re: Canon ir 5055

Thanks for the reply.

The laser unit was replaced and so was the HV unit with transformer.

I am currently NOT getting any codes after changing these two items however machine will print out Blank pages with Drum Pot On,with it off I get a decent copy. Voltages state that the primary is not turning on at all with drum PO on.

[blackcat4866]

Re: Canon ir 5055

I haven't worked on many of the latest Canons, but ...

... traditionally, potential control problems on the NP6650, NP6060, NP6085, and iR550 were all caused by bad potential control assembly, which includes the potential control sensor, the potential control PWB, and the harness between.

And yes, turning off the potential control will restore default values, and allow prints to be made. The potential control circuitry controls all the high voltages, developer bias, and perhaps even laser beam intensity.

Don't laugh. I have a temporary field remedy. You know how in class they always say " ... be very careful with the potential control sensor. It can be damaged easily ... ". Well, one of my co-workers had a bad potential control sensor that did not start to work after vacuuming, so what did he do? He whacked it against the back of his screwdriver! And what do you know? I worked for over a week. I have duplicated his success on a couple different occasions.

I have to agree. Potential Control next. =^..^=

[Rachid.Akli]

Re: Canon ir 5055

The laser unit was replaced and so was the HV unit with transformer.

I am currently NOT getting any codes after changing these two items however machine will print out Blank pages with Drum Pot On,with it off I get a decent copy. Voltages state that the primary is not turning on at all with drum PO on.



When you replaced the laser unit, have you eliminated the orange dust protective tape of the laser window?


Rachid.

[blackcat4866]

Re: Canon ir 5055

... When you replaced the laser unit, have you eliminated the orange dust protective tape of the laser window?
Rachid.

Yeah pjdbm, did you remove the friggin packing tape?
OMG! That made me laugh.

But seriously though, I had another thought.
You know how the analogs in that list usually made very dark copies when potential control failed? Nearly black copies with image still barely visible? Well with an excessively high primary charge a digital machine logically would produce white copies, with a faint latent image if it's visible at all.

It fits. =^..^=

[pjdbm]

Re: Canon ir 5055

The laser unit was replaced and so was the HV unit with transformer.

I am currently NOT getting any codes after changing these two items however machine will print out Blank pages with Drum Pot On,with it off I get a decent copy. Voltages state that the primary is not turning on at all with drum PO on.



When you replaced the laser unit, have you eliminated the orange dust protective tape of the laser window?


Rachid.

ummm yea, I took off that blue strip tape off the laser and shutter cam. Thanks (if that was still on it would code out me thinks.)

Funny Blackcat, I was talking with the techs at NWBS and they told me that 99% of the pot sensors/harness/board that go to them for repair are good and such a very small percent are bad.

I think your prediction and my luck lately that I will fall into that % lol


I am hoping it is not the drum that is giving such an out of range voltage that it cuts off the primary.

[blackcat4866]

Re: Canon ir 5055

I am hoping it is not the drum that is giving such an out of range voltage that it cuts off the primary.

It's certainly possible ... but I would think that you'd have a noticeable quality issue to address, even with potential control off. =^..^=

[pjdbm]

Re: Canon ir 5055

yea the machine lacks density with PO off, a bit of concern also lol, almost looking like toner save is on.

[vigour]

Re: Canon ir 5055

copier> adj> develop> d-hv-de
will improve your density, until you get it fixed

[teckat]

Re: Canon ir 5055

yea the machine lacks density with PO off, a bit of concern also lol, almost looking like toner save is on.

run this>>>> Copier>Function>DPC>1>OK

imageRUNNER 5055 / 5065 / 5075
Performing DPC Potential Control
Follow this revised Procedure

1) Select the item, and type in '1'; then, press the OK key.

2) Exit "Service Mode"

3) Make a copy (after pressing the start button the copier will execute potential control).

4) Turn off and then on the main power switch.

Verify DPOT values are correct.

Did u check the Potential Control harness and its associated connectors for kinks, wire ties,bent pins and proper routing.