Separation Claw Control; Paper Guide Plate Control - Minolta Di551 Service Manual

DRUM UNIT

[3] Separation Claw Control

MC24V 2
SPSD DRV
5V
P.GND
DRUM CONT
DRUM CLK
CW/CCW
DRUM EM
PRCB
24V2
P.GND
DCPS
Separation claws are driven by SD1 (separation
claw). Separation claws are swung by M2
(drum). SD1 is controlled by PRCB (printer con-
trol board).
1. Operation
a. Separation claw ON/OFF control
SD1 (separation claw) is a pull-type solenoid
powered by 24 VDC. It turns ON to press sepa-
ration claws against the drum to help image-cop-
ied paper separate.
(1) SD1 (separation claw) operation timing
SD1 turns ON after a lapse of specified time from
turning ON of PS43 (leading edge) of the second
paper feed section. It turns OFF after a lapse of
the time set by PRCB (printer control board).
b. Separation claw swing control
Separation claws are swung by M2 (drum) via
the cam mechanism.
2. Signals
a. Output signal
(1) SPSD_DRV (PRCB to DCDB)
SD1 (separation claw) drive control signal
[L]: SD1 ON
[H]: SD1 OFF
SD1
M2
MS1 MS2
2-E-2

[4] Paper Guide Plate Control

GP.CONT
PRCB
MS1
24V2
P.GND
DCPS
To prevent toner from adhering to the paper
guide plate, a constant voltage is applied to the
paper guide plate. This voltage is supplied from
HV (high voltage unit) and is controlled by PRCB
(printer control board).
1. Operation
a. ON/OFF timing
Turning ON/OFF in sync with M2 (drum)
b. Applied voltage
-500 VDC
2. Signal
a. Output signal
(1) GP. CONT (PRCB to HV)
This signal controls turning ON/OFF the voltage
application to the paper guide plate.
[L]: Voltage applied
[H]: Voltage not applied
GP
HV
MS2