Scanner Motor Pcb - Kyocera Mita KM-4230 Service Manual

2A3/4

2-3-5 Scanner motor PCB

SM Vref
SM M1–M3
SM CWB
SM CLK
SM ENABLE
Scanner
control PCB
EL ON REM
Power
source PCB
Figure 2-3-5 Scanner motor PCB block diagram
The scanner motor PCB (SMPCB) drives the scanner motor (SM), turns the exposure
lamp (EL) on and off, and relays signals from the scanner home position switch
(SHPSW), original size sensor 1, 2 (OSD1, 2) and the original detection switch
(ODSW).
The scanner motor (SM) is driven by turning the output for motor phase switchover on
and off (SM A, SM A, SM B, SM B). It is activated by the driver IC1 processing the
currently set reference signal (SM Vref), mode signals (SM M1 - M3, SM CWB), phase
changeover clock (SM CLK), drive/stop signals (SM ENABLE) from the main PCB.
The exposure lamp (EL) is turned on when the signal (EL ON REM) from the scanner
control PCB (SCPCB) is inverted by DT2 and the resulting lamp on/off signal (EL) goes
low. Signals from the scanner home position switch (SHPSW), original size sensor 1, 2
(OSD1, 2) and the original detection switch (ODSW) are relayed to the main PCB
(MPCB).
2-3-8
SMPCB
Driver IC1
5 V DC
DT2
PG
SM A
SM A
SM
SM B
SM B
SHPSW
ODSW
OSD1
OSD2*
EL
INPCB
24 V DC
EL
* For inch specification only.