Ricoh SP 200 Specifications download pdf (Page 74)

6.2 IMAGE TRANSFER AND PAPER SEPARATION

MECHANISM

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 to 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.

FGATE: Laser main scan writing start signal

A193D530.wmf

1 August 1996 IMAGE TRANSFER AND PAPER SEPARATION

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Ricoh SP 200 Specifications Page 74