Circuit Diagrams By Function; Dc Controller Circuit - Canon LBP-CX Series Service Manual

V. CIRCUIT DIAGRAMS BY FUNCTION
A. DC Controller Circuit
The DC controller process signals from the sensors and from the video controller, and outputs signals to
control the AC driver (which drives the fixing roller heater), high-voltage power supply, laser, scanner driver,
and-main motor driver (a part of DC power supply & main motor driver). It provides the external device with the
printer status. The DC controller also drives some DC loads directly.
Paper sensor (PS2)
Pickup sensor (PS1)
Delivery sensor (PS3)
Cassette-size (MSS-MS?)
sensor
Cartridge sensor ( MSS)
~r~m ~nsitivity
(MJ M 4 )
ind1cat1 on sensor '
Rotation speed sensor
Beam-detection sensor
Revolution speed sensor
Temperature sensor
3-24
Input signals
r- - - - - - - - - _.. - - -- -- - ,
Output signals
PEMP
I
I
PFS I
I
PDP
1----'1-- :
PS
,_____ I I
Photo interrupters
I
MS
Microswitch
Scanner
driver
Tachogenerator
SCNRDY
Optical fiber
Beam-
position
sensor
Main
motor
driver
Tachogenerator
TH
Thermistor
External
device
LSRTH
FSRTH
Interface
signals
I
CPR DY
Error
detection
circuit
PD
Photodiode
Interface
Laser driver
Scanner
1 - - - + - - - - t
driver
I
I
1
oRMD
Main
1--~----i
motor
driver
loc load
I drive ....---., Solenoid
signals DC Print counter
load Lamps
I
...._ _ __, Laser heater
I
IHVTR
IDBDC
!DBAC
IHVRST
HVPR High-voltage
1 - - - + - - - - -
power supply
IFSRD
I
LO
AC
driver
Laser
~-
_ _ _ _
~C~o~~e~i~~
_ _ _ _ _
J
Figure 3-19 DC controller circuit
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©
BY CAllON INC. CANON LBP-CX SERIES REv.2 JULY 1985 PRlllTBI IN JAPAN (IMPRIME AU JAPON)