M23 (Charger Cleaning) Control - Minolta Di850 Service Manual

CORONA UNIT SECTION
d. ADUSDB output signals
(1) T CONT (ADUSDB to HV2)
Transfer corona unit output ON/OFF control sig-
nal.
[L]: Transfer corona unit ON
[H]: Transfer corona unit OFF
(2) S CONT (ADUSDB to HV2)
Separation corona unit output ON/OFF control
signal.
[L]: Separation corona unit ON
[H]: Separation corona unit OFF
(3) SEL (ADUSDB to HV2)
Feedback switchover signal.
This signal determines whether the feedback
signal of the transfer and separation (DC) current
is used for toner separation monitor or toner
transfer monitor.
[L]: Toner separation monitor
[H]: Toner transfer monitor

[5] M23 (Charger Cleaning) Control

PS41
PS42
M23
M23 (charger cleaning) uses a DC motor with a 12V
drive, and is controlled directly by PRCB (printer con-
trol board). Related signals are PS41 (charger clean-
ing HP) and PS42 (charger cleaning limit).
1. Operation
a. Purpose of driving
M23 is used to drive the charging wire cleaning
pad.
b. Operation timing
The charging corona wires are cleaned when the
main switch is turned ON, when the fixing tem-
perature is lower than 50°C (122°F). They are
also cleaned when the specified copy count is
reached.
* Changeable with 25 mode DIPSW.
c. Cleaning operation
The home position of the charging wire cleaning
pad is on the rear side of machine. The charging
wire cleaning pad operates as follows:
Charging wire cleaning
pad HP
PS41
Home search (forward)
Home search (return)
2-F-4
5VDC
PS41
SGND
PS42
M23
DRIVE1
M23
PRCB
DRIVE2
12VDC
5VDC
SGND
DCPS1
Charging wire cleaning
pad limit
PS42
Cleaning (forward)
Cleaning (return)