Scanner Drive Pcb - Kyocera KM-3035 Service Manual

2FD/2FF/2FG

2-3-4 Scanner drive PCB

MPCB
The scanner drive PCB (SDPCB) consists of a stepping motor driver IC (IC1) as the center, digital transistors DT1 and DT2,
etc.
Drive of the scanner motor (SM) is controlled by the current setting voltage (SM Vref) that is output from the main PCB
(MPCB), the mode signals (SM M1 to M5, SM CWB), the phase switchover clock signal (SM CLK), and the drive/stop signal
(SM ENABLE).
Also the main PCB (MPCB) outputs a control signal (EL) through a digital transistor (DT2) to the inverter PCB (INPCB) to
turn on or off the exposure lamp (EL).
Also the scanner drive PCB (SDPCB) acts as an interchange circuit of signals for the original detection switch (ODSW) and
the scanner home position switch (SHPSW).
2-3-22
SM Vref
SM M1
SM M2
SM M3
SM M4
SM M5
SM CLK
SM CWB
SM RET
SM ENABLE
DT1
EL ON REM
DT2
ODSW
SHPSW
Figure 2-3-8 Scanner drive PCB block diagram
SDPCB
Stepping
motor
driver
IC1
SM A
SM _A
SM
SM B
SM _B
EL
EL
INPCB
ODSW
SHPSW