Filter
Top Products
74 MFP unit explanation ENWW
Toner guide roller (TGR) control
To enhance the toner cleaning ability,
voltage is applied to the TGR (toner guide
roller). This voltage is applied by HV (high
voltage unit) under the control of PRCB
(printer control board). The output level of
the applied voltage is transmitted using 8-bit
serial data. This serial data includes the level
information for all outputs driven by the HV
unit excluding the ON/OFF control signal.
Accordingly, a separate signal line is
provided to turn on/off only the TGR.
1 Operation
a ON/OFF timing
The TGR is turned on/off in sync with
M2 (drum).
b TGR (toner guide roller) output range
0 to 50 µA
2 Signals
a Output signal
1 TGR.CONT (PRCB to HV)
TGR (toner guide roller) voltage
ON/OFF control signal
[L]: Voltage is applied.
[H]: Voltage is not applied.
Other control
To improve durability of the cleaning blade,
the following control is performed:
1 Blade setting mode
A blade setting mode is available in the 36
mode.
This mode will perform a task that is
required after blade replacement during
maintenance, and so forth. When this
mode is used, toner adheres on the drum
and then the blade cleans the drum,
preventing blade peeling.
2 Black stripe creation control
To improve durability of the blade
(stabilize load and stabilize paper dust
crushing), a black stripe of toner is
adhered on the drum once every 10
copies and then cleaned.
*Changeable with the 25-mode DIP SW
PRCB
DCPS
24V2
P.GND
TGR
MS1 MS2
HV
TGR.CONT
TXD
CLK
LATCH