A few days ago we change the drum including its unit of our copier machine inorder to reduce the darken copy output; but till now no improvement made by changing the drum of the machine,so how could we solve the problems.the machine is cannon np7161.
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Drum Unit, Make sure the scan glass and platen glass is clean. Run copies from glass and document feeder to see if line appears on one or both. Both Drum unit or fusing Film. Will need a copier tech to remove parts for inspection.
Necessary entering the identification number of the access; the unset: Head - ID - a foots - a head - (on дисплее will appear ID1) - 2 - a start - (on дисплее 2-1) - 0 - (on displey 2-0) - a start - (the codes of the users delete) - ID possible to copy.
NP7161 - a regulation AE
Adjustment AE: -User mode 12 - an the man picture, 12. then - a button "+/- exposure" (24 steps); "Start" - a taking the change
Check the machine for a **** or dust glass above the drum.
Check and clean coronas, the wires and shells may be dirty reducing charge.
Run a few white copies, to check of the toner / carrier ratio is low.
Here's information from the HP manual: Use the copy features The HP All-in-One enables you to produce high-quality color and black-and-white copies on a variety of paper types, including transparencies. You can enlarge or reduce the size of an original to fit a specific paper size, adjust the darkness of the copy, and use special features to make high-quality copies of photos, including borderless copies.
Press Copy repeatedly to display the appropriate menu. The following menus are available: – Number of copies – Reduce/Enlarge – Copy Quality – Copy Paper Size – Paper Type – Lighter/Darker – Enhancements – Set New Defaults 2. Press the until the appropriate setting appears. 3. Do one of the following: – To change more settings, press Copy. This selects the current setting and displays the next menu. – To start the copy job, press Start Color or Start Black.
To save the current settings as defaults for future jobs 1. Make any needed changes to the settings in the Copy Menu. 2. Press Copy repeatedly until Set New Defaults appears. 3. Press until Yes appears and then press OK.
go to servce mode by just press additional function key than 2& 8 no. key together than again additional function key. than by pressin light and dark button go to clear all option than press (A) in light dark button. now switch off your machine than on.
Sounds like your drum cartridge might be bad.
Something you can try that might narrow down the problem is to make a copy of something and shut the copier OFF in mid copy.
(Basically, when the light is about 1/2 way finished scanning.)
Then, open the machine up and removed the jammed paper which should be 1/2 way through your machine and hopefully about 1/2 way under the drum/toner cartridge unit.
See how the copy looks at that point. **** FYI **** The toner on the paper is NOT FUSED so it will RUB OFF. Keep the paper away from your clothes and toss it.
IF your copy has smudges on it, then there is a real good chance that your drum unit is bad and needs to replaced.
If the copy looks good, then there is a possibility that the fuser unit is bad and needs to be repaired.
I would say that your drum unit is bad with my experience with Canon Copier.
If you still have more questions, feel free to ask.
Have a good day. Good luck.
Most likely it is the cleaning blade that cleans the drum after every copy. If you are comfortable removing the drum unit, you can probably replace the cleaning blade on your own.
If you are from the US, you can order parts from: www.precisionroller.com
Good luck. Hope this helps. If you have any more questions, feel free to post them. Have a good day.