(4) After the image transfer is
completed, the charge on the
transfer belt holds the paper on the
transfer belt. Excess charge on the
paper and the transfer belt is
discharged during rotation via the
grounded idle roller [K].
When the transfer high voltage
supply board [L] inside the transfer
belt unit provides high voltage to
the transfer bias roller, a small
current (I
2
) flows to ground via the
transfer belt, the paper, and the
OPC drum. It is important that this
current stays constant even if the
paper, environmental conditions, or
the transfer belt surface resistance
change. The positive feedback of I
1
to the power supply board causes
the voltage to increase and
decrease with I
1
so that (I
2
)
remains constant. (The relationship
is I
2
= I – I
1
.)
[K]
H.V. Supply Board
[L]
I
I
1
I
2
I
2
= I – I
1
= constant
[L]
A156/A160/A162 2-64 STM
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