Image Transfer And Paper Separation Mechanism - Gestetner A193 Service Manual

6.2 IMAGE TRANSFER AND PAPER SEPARATION
MECHANISM
FGATE: Laser main scan writing start signal
The transfer roller starts rotating at the same time as the main motor starts to
rotate.
1. When the CPU receives the image writing start signal (FGATE signal),
the CPU instructs the power pack to supply +10 µA (low transfer bias) to
the roller. This prevents any positively charged toner on the drum surface
from transferring to the transfer roller.
2. At a certain time after the low transfer bias has been supplied to the
roller, +15 µA (high transfer bias) is applied to the roller to transfer the
toner from the drum and onto the paper.
3. After the trailing edge of the paper has passed through the roller, the transfer
bias turns off. In the multiple copy mode, the transfer bias shifts again to the
low transfer bias.
SM
IMAGE TRANSFER AND PAPER SEPARATION
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