Transfer/Separation Control - Minolta Di551 Service Manual

[4] Transfer/Separation Control

T.CONT
EM(T).SIG
S.CONT
EM(S).SIG
TXD
CLK
LATCH
PRCB
MS1
24V2
P.GND
DCPS
The voltages applied to the transfer wire and
separation wire is supplied from HV (high voltage
unit) and are controlled by PRCB (printer control
board). The levels of outputs to these wires are
transmitted using 8-bit serial data. This serial
data includes the level information for all outputs
driven by HV, excluding the ON/OFF control sig-
nal. Accordingly, a separate signal line is pro-
vided to turn ON/OFF only the transfer wire or
separation wire.
1. Operation
a. Transfer
Positive DC high voltage is used for transfer.
Transfer DC output range: 50 µA to 600 µA
b. Separation
AC high voltage and negative DC voltage are
used for separation.
Separation AC output range: 4kV to 5.7kV
Separation DC output range: 0 µA to -400 µA
2. Signals
a. Input signals
(1) EM (T) .SIG (HV to PRCB)
This signal indicates the leak or short state of the
transfer corona unit.
[L]: Normal
[H]: Abnormal
(2) EM (S) .SIG (HV to PRCB)
This signal indicates the leak or short state of the
separation corona unit.
[L]: Normal
[H]: Abnormal
TRANSFER
HV
SEPARATION
MS2
2-F-3
CORONA UNIT SECTION
b. PRCB output signals
(1) T.CONT (PRCB to HV)
This signal turns ON/OFF the voltage applied to
the transfer wire.
[L]: Transfer voltage ON
[H]: Transfer voltage OFF
(2) S.CONT (PRCB to HV)
This signal turns ON/OFF the voltage applied to
the separation wire.
[L]: Separation voltage ON
[H]: Separation voltage OFF