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4. PWB (Explained with the SF-1120 and the SF-CM15)
No Name Description No Name Description
1 Operation PWB A Operation input, display control 2 Operation PWB B Operation input, display control
3 Blank lamp PWB Used to control the blank lamp. 4 DL PWB Used to drive the discharge lamp.
5 Optical PWB AE sensor and lens motor interface 6 Process control PWB Used to sense the toner density.
7 Main PWB Used to control the body. 8 AC circuit PWB AC power input
9 CSD PWB Used to sense the body cassette
size.
F DC circuit PWB DC power input
G Paper feed power PWB
(SF-CM15)
Used to supply power to drive the
paper feed unit.
H Motor control PWB Used to drive and control the
paper feed motor and the
transport motor.
I CSD B PWB Used to sense the cassette size of
2nd ∼ 4th tray.
J Motor sensor PWB Encoder for 2nd ∼ 4th paper feed
motor
K Tray module PWB Vertical transport of 2nd ∼ 4th
cassette, JAM detection, paper
feed clutch interface
L DPPD PWB Vertical transport of 2nd ∼ 4th tray,
JAM detection and cover open
detection
M ADU PWB ADU control N PID PWB Manual paper entry detection
O PPD PWB Body PR roller JAM detection P High voltage PWB Process high voltage, developing
bias voltage supply
Q PDD PWB Body paper exit section JAM
detection, ventilation fan motor
interface
R Paper feed I/F PWB I/F of copier paper detection and
the paper feed clutch.
S Sub DC power PWB Used to supply power in the power
save mode. (5V is supplied to the
main PWB and the operation
PWB.)
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