Sharing Canon knowledge

[ar6565]

What is

offset value, and
PVE_OFST, EPOTOFST, VD-OFST, DE-OFST, Vdc

help, please . .

[teckat]

What is

offset value, and
PVE_OFST, EPOTOFST, VD-OFST, DE-OFST, Vdc

help, please . .

If u do not understand the copy process, this will mean nothing. Some Processes for B&W & Color will differ in said models

OFST= Use it to adjust the offset value of the potential sensor.
This mode item is part of the series of procedures you have to perform when you have replaced the potential sensor unit. Be sure never to execute it on its own.

Laser>PVE-OFST= (used to adjust the laser write start position.)
V-CONT>EPOTOFST=(setting potential sensor offset value)
V-CONT>DE-OFST = (adjusting copy Vdc)
V-CONT>VD-OFST= (adjusting copier VD target potential offset value)
V-CONT>DE-OFS-P =(adjusting printer Vdc)
V-CONT>VD-OFS-P =(setting printer VD target potential offset value)

VD= VOLTAGE DARK AREA ON DRUM
To measure the dark area potential (VD) for the first time after the power switch is turned on, the machine uses the most recently measured current level, and measures the drum surface potential using the potential sensor. The DC controller PCB compares the drum surface potential and the target potential; as a result, if the measured potential is +/-6 V of the target value, the machine corrects the primary current and measures the potential once again.

VL=light area potential on Drum
VL1T =light-area potential target value
VL1M =light-area potential measurement value
VL2M =light-area potential measurement value for developing bias
VDT =dark-area potential target value
VDM =dark-area potential measurement
VL2M-P =light-area potential measurement value for developing bias for printer image
VL1M-P =light-area potential measurement value for printer image
VL1T- P =light-area potential target value for printer image
VDM-P =light-area potential measurement value for printer image
VDT- P =dark-area potential target value for printer image

[DAG COPIERS & COMPUTERS]

In short, the word OFFSET simply means ' TO COMPENSATE for something, or to BALANCE something', be it a voltage, current, power or signal. If u read carefully two or three times, Teckat's last article on this thread, under the sub-heading ' VD- VOLTAGE DARK AREA ON DRUM' you should be able to grasp a clear understanding of the meaning and application. It is a very common terminology in electrical engineering principles.
As i stated earlier on at the beginning of this thread, strive to get hold of the service manuals of these machines, read them regularly so that u can learn the technical theories of these machines, all the terminologies used and their meanings are contained there, make them your companion. Refer to how ' THE Desert rat' solved a problem above, it was splendid!

[ar6565]

I deeply thank all people who participated in this thread.

[teckat]

I deeply thank all people who participated in this thread.

Thanks-
Good Read below- go to links
download these Guides I posted, very helpful

http://www.copytechnet.com/forums/ca...nce-guide.html

http://www.copytechnet.com/forums/ca...nce-guide.html

[Desert Rat]

Thanks teckat, I will do the same. Always looking to sharpen my pencil, sort a speak.

DR