Laser Scanner Section - Sharp MX-M350 Service Manual

5. Laser scanner section

B. Major parts and signal functions
MOTHER
MFP
BOARD
CONTROL
PWB
PWB
CN1
Signal
Code
name
PM PM Polygon mirror (motor)
BD BD PWB
No. Name Code, signal name
RW Control signal +5VLD
RW Control signal /READY
RW Control signal /PMCLK
RW Control signal /START
RW Control signal /VIDEO
RW Control signal /SYNC
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 43
PCU
PWB
CN2
SLD30R-1
CN16
30 +12V2
S32B-PHDSS-B
29 PCU_VCCW
BR
28 GND TEST3 1
BR
TEST2
27 DTR_PCU 2
GY
26 GND GND2 3
BR
25 DSR_PCU /SYNC 4
GY
24 GND GND2 5
GY
TXD_PCU GND2
23 6
GY
22 GND GND2 7
BR
21 RXD_PCU LSU_S/H
8
BR
20 POF VRB 9
GY
MSW_MON GND2 10
19
GY
CN2
11
18 GND GND2
BR
17 RES_PCU TEST 12
BR
16 GND VIDEO 13
LBR
15 HSYNC /VIDEO 14
BR
14 GND /LDON 15
GY
13 DTEN GND2 16
GY
12 BUR_PR GND2 17
BL
11 GND2 +5V2 18
GY
10 VIDEO1 GND2 19
BL
9 VIDEO0 +5V2 20
RD
8
GND +24V1 21
RD
7 +5V1 +24V1 22
BR
6 +5V2 /VFM1 23
GY
5 +5V2 GND2 24
BR
4
+5V2 /START 25
BR
3 +5V2 /VFM1 26
BR
2 +5V2
/PMCLK 27
BR
1 +12V1 /READY 28
GY
GND2 29
GY
GND2 30
BL
+5V LD 31
GY
GND2 32
Name Type
Reflection of the laser beam though constant rotation of the motor.
Detects the laser scan start timing. This device is used to detect a
laser trouble.
5V power for laser diode
Polygon mirror motor READY signal ("L" in the constant speed rotation)
Clock signal for driving the polygon mirror motor
Polygon mirror motor drive start signal
VIDEO (Image signal)
Sync signal (SYNC) from BD, sync signal for 1 line
A. General
Image data sent from the MFP (image process circuit) through the
mother board and PCU are converted into laser beams to expose
the drum surface.
5
2
6
10
BD
3
4
CN2
S32B-PHDSS-B
32 TEST3
CN1
TEST2
31
S11B-PH-K-S
30 GND2
45 sheets (35 sheets)
RD
29 /SYNC
+24V1 11
BR
28 GND2
VFM1\ 10
GY
GND2
27
GND2 9
RD
26 GND2
+24V1
8
BR
LSU_S/H
25
VFM1\ 7
GY
24 VRB
GND2
6
RD
GND2
23
+24V1 5
BR
22 GND2
PMCLK\
4
BR
21 TEST
READY(READY\) 3
BR
20 VIDEO
START\
2
GY
19 /VIDEO
GND2 1
18 /LDON
17 GND2
16 GND2
LSU
15 +5V2
14 GND2
13 +5V2
12 +24V1
CN3
11 +24V1 S4B-PH-K-S
BR
10 /VFM1 GND2 1
LB
GND2 SYNC\
9 2
BR
8 /START GND2 3
BL
/VFM1 +5V2
7 4
6 /PMCLK
/READY
5
4 GND2
3 GND2
2 +5V LD
1 GND2
Function/Operation
Function
1
PM
7
9
PHNR-03-H+BU03P-TR-P-H
RD
3 +24V1 1
BR
2 VFM1\ 2
GY
1 GND2 3
POWER SOURCE
PHNR-03-H+BU03P-TR-P-H SECTION
RD
3 +24V1 1
BR
VFM1\
2 2
GY
1 GND2 3
PHR-5
1 PMCLK
READY
2
3 START\
4 GND2
5 +24V1
B4B-PH-K-S
4 GND2
SYNC\
3
2 GND2
+5V2
1
8
VFM1
VFM1
NOTE