H. Section - Sharp AR-M256 Service Manual

No. Name
21 2nd cassette paper
pass sensor
22 2nd cassette paper
upper limit detection
sensor
23 2nd cassette paper
empty sensor
24 1st cassette paper PPD1H 1st cassette paper pass
pass sensor
25 1st cassette paper
upper limit detection
sensor
26 1st cassette paper
empty sensor
27 Toner sensor
28 Center tray paper LOEMP Center tray paper YES/NO
YES/NO sensor
29 Main switch
30 Original size sensor
31 Reverse pass paper
detection sensor
G. PWB unit
11
10
9
8
7
No. Name
1 Inverter PWB
2 CCD PWB
3 Option connector PWB
4 IMC PWB
5 MCU PWB
6 Mother board
7 Tray interface PWB
8 DC power supply PWB
9 High voltage PWB
10 KEY PWB
11 OPU PWB
AR-M256/M257/M258/M316/M317/M318/5625/5631 EXTERNAL VIEW AND INTERNAL STRUCTURE 6 - 6
Code Function and operation
PFD2 2nd cassette paper pass
LUD2 2nd cassette paper upper
limit detection
PED2 2nd cassette paper empty
detection
LUD1 1st cassette paper upper
limit detection
PED1 1st cassette paper empty
detection
Toner density detection
detection
PSSW Main power switch
DSIN0 Document size detection
(Inch series: PD1, 2)
(AB series: PD1 – 3)
DUP2
Reverse pass detection
1
2
3
Function and operation
Copy lamp control
For image scanning (read)
Image process
Main unit control
Connection with FAX PWB and
PCL PWB
2nd tray control
DC voltage control
High voltage control
Operation panel control

H. Section

1 2
23
No.
1 Copy lamp
2 Copy lamp unit
3 LSU unit
4 Lens unit
5 MC holder unit
6 Paper exit roller
4
7 Transport roller
8 Upper heat roller
5
9 Lower heat roller
6
10 Drum unit
11 DUP transport follower
roller
12 DUP transport roller
13 Transport roller
14 Resist roller
15 Manual feed tray
16 Manual paper feed roller
17 Manual feed transport
roller
18 1st cassette pick-up roller
19 1st cassette paper feed
roller
20 2nd cassette pick-up
roller
21 2nd cassette paper feed
roller
22 MG roller
23 2nd/3rd mirror unit
3 4 5
22 21 20
Name Function and operation
Image radiation lamp
Operates in synchronization with
2nd/3rd mirror unit to radiate
documents sequentially.
Converts image signals into laser
beams to write on the dum.
Reads images with the lens and
the CCD.
Supplies negative charges evenly
on the drum.
Paper exit roller
Paper transport roller
Fuses toner on paper.
(with the Teflon roller)
Fuses toner on paper.
(with the silicone rubber roller)
Forms images.
Duplex paper transport
Duplex paper transport
Transfer images on the drum onto
paper.
Synchronize the paper lead edge
with the image lead edge.
Manual feed paper tray
Picks up papers in manual paper
feed port.
Transports paper from the manual
paper feed port.
Picks up paper from the cassette.
Transports the picked up paper to
RESIST section.
Picks up paper from the cassette.
Transports the picked up paper to
RESIST section.
Puts toner on the OPC drum.
Reflects the images from the copy
lamp unit to the lens unit.
6
7
8
9
10
11
12
13
14
16 15
17
18
19