Sharp AL-1551 (serv.man4) Service Manual ▷ View online
AL-1551 EXTERNAL VIEWS AND INTERNAL STRUCTURES 4-2
3. Operation panel
1
Duplex Mode select key and indicator
(RSPF only)
2
Exposure mode selector key and indicators
Use to sequentially select the exposure modes: AUTO, MANUAL or
PHOTO. Selected mode is shown by a lit indicator.
PHOTO. Selected mode is shown by a lit indicator.
3
Light and dark keys and exposure indicators
Use to adjust the MANUAL or PHOTO exposure level.
Selected exposure level is shown by a lit indicator.Use to start and
terminate user program setting.
Selected exposure level is shown by a lit indicator.Use to start and
terminate user program setting.
4
Alarm indicators
Drum replacement required indicator
Misfeed indicator
TD cartridge replacement required indicator
5
SPF indicator
6
SPF misfeed indicator
7
Copy ratio selector key and copy ratio indicators
Use to sequentially select preset reduction/enlargement copy
ratios.
Selected copy ratio is shown by a lit indicator.
ratios.
Selected copy ratio is shown by a lit indicator.
8
Zoom indicator
9
Copy ratio display (%) key
10
Display
Displays the specified copy quantity, zoom copy ratio, user program
code, and error code.
code, and error code.
11
ON LINE indicator
Lights up when the machine is used as a printer.
12
Power save indicator
Lights up when the copier is in a power save mode.
13
Tray select key
Use to select a paper feed station (paper tray or bypass tray).
14
Paper feed location indicators
Light up to show the selected paper feed station.
15
Zoom keys
Use to select any reduction or enlargement copy ratio from 50% to
200% in 1% increments.
200% in 1% increments.
16
Copy quantity keys
•Use to select the desired copy quantity (1 to 99).
•Use to make user program entries.
17
Clear key
•Press to clear the display, or press during a copy run to terminate
copying.
•Press and hold down during standby to display the total number of
copies made to date.
18
Print key and ready indicator
•Copying is possible when the indicator is on.
•Use to set a user program.
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3
4
5
6
7
8
9
10
11
12
18
17
16
15
14
13
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AL-1551 EXTERNAL VIEWS AND INTERNAL STRUCTURES 4-3
4. Motors and solenoids
No.
Part name
Control signal
Function,operation
1
Main motor
MM
Drives the copier.
2
Mirror motor
MRMT
Drives the optical mirror base (scanner unit).
3
Toner motor
TM
Supplies toner.
4
Cooling fan motor
VFM
Cools the optical section.
5
Resist roller solenoid
RRS
Resist roller rotation control solenoid
6
Paper feed solenoid
CPFS1
Cassette Paper feed solenoid 1
7
Multi paper feed solenoid
MPFS
Multi manual pages feed solenoid
8
SPF motor
SPFM
Drives the single pass feeder
9
Duplex motor
DMT
Devices the duplex paper transport section
10
Original feed solenoid
SPUS
Original feed solenoid
11
Paper feed solenoid
CPFS2
Cassette Paper feed solenoid 2
1
2
9
10
3
4
5
7
6
11
8
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AL-1551 EXTERNAL VIEWS AND INTERNAL STRUCTURES 4-4
5. Sensors and switches
No.
Name
Signal
Type
Function
Output
1
Mirror home position sensor MHPS
Transmission sensor
Mirror (scanner unit) home position
detection
detection
"H" at home position
2
POD sensor
POD
Transmission sensor
Paper exit detection
"H" at paper pass
3
PPD2 sensor
PPD2
Transmission sensor
Paper transport detection 2
"L" at paper pass
4
Cassette detection switch
CED1
Microswitch
Cassette installation detection
"H" at cassette insertion
5
Manual feed detection switch MFD
Transmission sensor
Manual feed paper detection
(single only)
(single only)
"L" at paper detection
6
PPD1 sensor
PPD1
Transmission sensor
Paper transport detection 1
"L" at paper pass
7
Door switch
DSW
Micro switch
Door open/close detection
(safety switch for 5V)
(safety switch for 5V)
1 or 0V of 5V at door open
8
Door switch
DSW
Micro switch
Door open/close detection
(safety switch for 24V)
(safety switch for 24V)
1 or 0V of 24V at door open
9
Drum reset switch
DRST
Micro switch
New drum detection switch
Instantaneously "H" at insertion of new
drum
drum
10
SPF sensor
SPID/
SD SW
SD SW
Transmission sensor
Paper entry detection
Cover open/close detection
Cover open/close detection
"L" at paper pass
11
SPPD sensor
SPPD
Transmission sensor
Paper transport detection
"L" at paper pass
12
SDOD sensor
SDOD
Transmission sensor
SPF open/close detection Book sensor "L" at paper pass
13
2nd cassette
DSW
Micro switch
2nd cassette door open detection
1 or 0V of 5V at door open
14
PPD3 sensor
PPD3
Transmission sensor
Paper transport detection 3
"L" at paper pass
1
2
12
3
4
5
6
7
9
8
10
13
14
11
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AL-1551 EXTERNAL VIEWS AND INTERNAL STRUCTURES 4-5
6. PWB unit
No.
Name
Function
1
Exposure lamp invertor PWB
Exposure lamp (Xenon lamp) control
2
Main PWB (MCU)
Copier control
3
Operation PWB
Operation input/display
4
Power PWB
AC power input, DC voltage control, High voltage control
5
CCD sensor PWB
For image scanning
6
LSU motor PWB
For polygon motor drive
7
TCS PWB
For toner sensor control
8
LSU PWB
For laser control
9
Memory PWB 6MB
For memorying data
10
GDI Printer PWB
GDI Printer control
2
4
1
3
5
6
7
8
9
10
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