Canon imagePRESS C1 Service Manual - page 411
Chapter 7
7-62
F-7-77
[1] Primary transfer roller
[2] Potential plate
[3] Secondary transfer inside roller
[4] Secondary transfer outside roller
HVT2: High-voltage PCB 2
HVT3: High-voltage PCB 3
HVT4: High-voltage PCB 4
HVT5: High-voltage PCB 5
HVT6: High-voltage PCB 6
HVT8: High-voltage PCB 8
HVT9: High-voltage PCB 9
HVT10: High-voltage PCB 10
HVT2-SUB: Sub high-voltage PCB 2
HVT3-SUB: Sub high-voltage PCB 3
DC-CON: DC controller
The following is the additional explanation for each bias used at the transfer assembly.
- Primary transfer bias (applied bias: DC)
The primary transfer bias is the bias for transferring the toner on the photosensitive drum to ITB. It is applied to the primary transfer roller.
- Primary transfer reverse bias (applied bias: -DC)
This bias is the bias for cleaning the patch pattern formed on the drum by the image stabilization control (D-half control, simplified D-half, ATR control).
The patch pattern on the drum is not transferred to ITB by applying this bias at the time of the image stabilization control, and is collected by the photosensitive
drum cleaner.
- Tension roller bias (applied bias: DC)
To prevent toner splash at roller position with belt pulled, two potential plates covering ITB are installed. Applying bias to three tension rollers (tension roller
bias) against these potential plates prevents the toner splash. Electric field is produced between the tension roller and the potential plate when applying bias,
to attract the excess toner to the potential plate.
- Secondary transfer bias (applied bias: -DC)
The secondary transfer bias is the bias for transferring the toner on ITB to the print paper.
There is one kind of the secondary transfer bias. It is applied to the secondary transfer inside roller.
DC reverse bias is applied to the secondary inside roller at printing.
The residual toner attached on the secondary transfer outside roller is collected by the brush roller in the waste toner case of the secondary transfer assembly.
- Secondary transfer static eliminator bias (applied bias: -DC)
DC-CON
HV2-SUB
HVT2
HVT4
J3050
HVT9
J3400
J3150
[1]
J1189
J1187
J1184
J203
J207
J206
J202
J204
J1188
J205
J201
TR1_OUT
TR2_OUT
HVT6-2
J10
HVT6-1
J3250
HVT3-SUB
J26
J7
HVT8
J3350
HVT3
J3100
[2]
[2]
[3]
[4]
HVT10
HVT5
J11