Canon Color iR C3480, Service Manual

Page: 650 / 774

Chapter 17
17-47
12. FEED-ADJ
T-17-36
1TR-TGM Adjust the offset for the primary transfer ATVC target current (M)
Adjustment range: -10 to 10 (Unit: 1muA)
[Factory setting value/Value after RAM clear: 0]
This is valid when COPIER>OPTION>BODY>PTATVCSW=1 is set (the primary transfer ATVC control is valid).
Specify the offset amount of the primary transfer ATVC target current.
By executing ATVC operation after input, the control value is changed and is become valid. (It is executed by opening/
closing the front door.)
Perform the operation when the following symptoms occur:
- Image memory on the surface of the drum due to the transfer bias
The density at 95mm from the leading edge of image is dark. The symptom is significant with all-dark halftone image.
-> Set a smaller value
- Accordion-like dark short horizontal lines
Discharging trace caused by transfer at the succeeding station (Y, M, C, K, in this order).
-> Set a smaller value to the succeeding station.
Example: When symptom occurs with a Cyan image, set a smaller value to the Bk station.
- Poor transfer of the primary transfer roller
White strips with 55mm interval. With a highly-concentrated image, 5 to 10mm width horizontal white lines at the ends
of the image.
-> Set a larger value.
2
1TR-TGK1 Adjust the offset for the primary transfer ATVC target current (Bk: Black single mode)
Adjustment range: -10 to 10 (Unit: 1muA)
[Factory setting value/Value after RAM clear: 0]
This is valid when COPIER>OPTION>BODY>PTATVCSW=1 is set (the primary transfer ATVC control is valid).
Specify the offset amount of the primary transfer ATVC target current.
By executing ATVC operation after input, the control value is changed and is become valid. (It is executed by opening/
closing the front door.)
Perform the operation when the following symptoms occur:
- Image memory on the surface of the drum due to the transfer bias
The density at 95mm from the leading edge of image is dark. The symptom is significant with all-dark halftone image.
-> Set a smaller value
- Accordion-like dark short horizontal lines
Discharging trace caused by transfer at the succeeding station (Y, M, C, K, in this order).
-> Set a smaller value to the succeeding station.
Example: When symptom occurs with a Cyan image, set a smaller value to the Bk station.
- Poor transfer of the primary transfer roller
White strips with 55mm interval. With a highly-concentrated image, 5 to 10mm width horizontal white lines at the ends
of the image.
-> Set a larger value.
2
COPIER>ADJUST>FEED-ADJ
Sub item Description level.
REGIST Used to adjust the registration roller clutch ON timing.
Adjustment method
- Increasing the value by 1 moves the image by 0.1 mm in the direction of the leading edge of the paper.
- If you have cleared the DC controller PCB's RAM or replaced the DC controller PCB, enter the value on the service
label.
Adjustment range - 50 to 50 (0.1 mm units)
[Factory default/After RAM clear: -20]
1
REG-THCK Registration clutch ON timing (thick paper)
Adjusts the margin on the leading edge (0.1mm scale) by adjusting the timing to turn ON the registration clutch for thick
paper.
Setting Range: 50 ~ -50
[Factory default value / post-RAM clear value: 0]
1
REG-OHT Registration clutch ON timing (OHT)
Adjustment of the OHT registration clutch ON timing allows adjustment of the leading edge margin (unit: 0.1mm).
Setting range: -50 to 50
[Factory settings and after RAM clear: 0]
1
REG-DUP1 Second page registration clutch ON timing (plain paper)
Adjustment of the plain paper second page registration clutch ON timing allows adjustment of the second page leading
edge margin (unit: 0.1mm).
Setting range: -50 to 50
[Factory settings and after RAM clear: 0]
1
REG-DUP2 Second page registration clutch ON timing (thick paper)
Adjustment of the thick paper second page registration clutch ON timing allows adjustment of the second page leading
edge margin (unit: 0.1mm).
Setting range: -50 to 50
[Factory settings and after RAM clear: 0]
1
COPIER>ADJUST>HV-TR
Sub item Description Level.