4. Drum motor control
Figure 2-2-25
The drum motor is a two-phase stepping motor. This motor is controlled by the drum motor dri-
ver (IC235) on the developing PCB and operates the ITB unit and the drum cartridge.
When the M-CPU (IC1009) receives a PRINT SEQUENCE SPECIFICATION command from the
D-CPU (IC1001), the M-CPU sends DRUM MOTOR DRIVE signals (DRMMA, DRMMB, /DRM-
MAON, /DRMMBON) to IC235.
In response to these signals, IC235 generates drive signals (DRMMAO, /DRMMAO, DRMM-
BO, /DRMMBO) to the motor to run the drum motor.
The motor rotates when the /DRMMAON and /DRMMBON signals are set to “L” and stops
when “H.”
2 - 33
CHAPTER 2
J204
-1
-3
-4
-2
J201
-A3
J1017
-A9 /DRMMAON
M-CPU
(IC1009)
D-CPU
(IC1001)
+5V
REF5V
DRMMAO
/DRMMAO
DRMMBO
/DRMMBO
/DRMMBON
+5V
-B3
-B9
-B2
-A2
-B10
-A10
DRMMA
DRMMB
IC235
M4
DC controller PCB
Developing PCB
Drum motor driver
Drum motor
Summary of Contents for CLBP-460PS
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