Brother HL-2700CN Series, Service Manual

Page: 71 / 377

IV-18
7 Second Transfer (Paper)
Second Transfer Process means that the toner image on the transfer belt is transferred
onto the transported paper.
(1) Structure of Belt Cleaning
i) Transfer roller for the second transfer is located as shown in Fig.4-8.
ii) Transfer roller is normally separated from the transfer belt.
iii) Transfer roller is positively biased by the power supply THV.
iv) Transfer roller contacts to the transfer belt in the second transfer process.
v) Transported paper passes between the transfer roller and transfer belt.
(2) Process of Belt Cleaning (Refer to Fig.4-21.)
i) Paper is transported as synchronizing with the transfer belt.
ii) Transfer roller operates as synchronizing with the transported paper, and
contacts with the transfer belt through the transported paper.
iii) Transported paper passes between the transfer roller and transfer belt. In this
instance, the positive high voltage (THV) is injected to the transfer roller.
iv) Negatively charged toner is moved to the positively charged paper.
v) Transported paper with the toner transferred is transported to the paper
discharging process.
Transfer Roller
Paper
THV: Power Supply for Transfer
Roller Bias.
+THV
Transfer Belt
Registration Roller
Transfer Unit
Fig.4-21