SHARP AL-841 Service Manual
CODE: 00ZAL841//F1E
DIGITAL LASER
MULTIFUNCTION
MODEL AL-841
AL-841
CONTENTS
[ 1 ] SYSTEM CONFIGURATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
[ 2 ] SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
[ 5 ] EXTERNAL VIEW AND INTERNAL STRUCTURE . . . . . . . . . . . . 2
[ 6 ] MACHINE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
[ 7 ] ADJUSTMENTS, SETTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
[ 8 ] SIMULATION (Test Command) ⋅ USER PROGRAM . . . . . . . . . . 5
[ 9 ] ACTUAL WIRING CHART. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
[10] CIRCUIT DIAGRAM AND PARTS LOCATION CHART . . . . . . . 10
PARTS GUIDE
This Service Manu al de scr i be s only th e di f fe r en t po i nt s f rom th e AL - 84 0.
For servicing of the AL-841, therefore, use this Service Manual together
with that of the AL-840.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
AL-841
At the produc tion line, the ou tput power of
the scanner unit is adjusted to 0.33
MILLI-WATT PLUS 20 PCTS and is
maintained cons tant by th e operatio n of the
Automatic Power Control (APC).
Even if the APC circuit fails in operation for
some reason, the maximum output power
will only be 15 MILLI-WATT 0.1 MICROSEC. giving an acceptable emission level
of 42 MICRO-WATT w hich is still -less than
the limit of CLASS-1 laser product.
Caution
The fusing unit is hot. Exercise care when inspecting it.
Do not switch the printer rapidly on and off. After turning the printer off,
wait 10 to 15 seconds before turning it back on.
Printer power must be turned off before installing any supplies.
CAUTION
VORSICHT
ADVARSEL
ADVERSEL
Laserstrahl
VAROITUS! LAITTEEN KÄYTTÄMINEN MUULLA
KUIN TÄSSÄ KÄYTTÖOHJEESSA MAINITULLA
TAVALLA SAATTAA ALTISTAA KÄYTTÄJÄN
TURVALLISUUSLUOKAN 1 YLITTÄVÄLLE
NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE.
VARNING - OM APPARATEN ANVÄNDS PÅ ANNAT
SÄTT ÄN I DENNA BRUKSANVISNING
SPECIFICERATS, KAN ANVÄNDAREN UTSÄTTAS
FÖR OSYNLIG LASERSTRÅLNING, SOM
ÖVERSKRIDER GRÄNSEN FÖR LASERKLASS 1.
VARNING
VARO!
INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS
DEFEATED AVOID EXPOSURE TO BEAM.
UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEÖFFNET UND SICHERHEITSVERRIEGELUNG ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
USYNLIG LASERSTRÅLNING VED ÅBNING. NÅR SIKKERHEDSBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE FOR STRÅLNING.
USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG SIKKERHEDSLÅS BRYTES.
UNNGÅ EKSPONERING FOR STRÅLEN.
OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD OCH SPÄR RAR ÄR
URKOPPLADE. STRÅLEN ÄR FARLIG. BETRAKTA EJ STRÅLEN
AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA
NÄKYMÄTÖNTÄ LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN
CLASS 1
LASER PRODUCT
.
.
The foregoing is applicable only to the 220V
model, 230V model and 240V model.
Caution
This product contains a low power laser
device. To ensure continued safety do not
remove any cover or attempt to gain access
to the inside of the product. Refer all
servicing to qualified personnel.
LASER KLASSE 1
LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT
Wave length
Pulse times
Output Power
780 ± 15nm
(9.3 ± 2µs)/7mm
0.4mW ± 0.05mW
[1] SYSTEM CONFIGURATION
3. SOFTWARE
Items Contents Media
GDI Printer driver Printer driver CD-ROM
Twain driver Scanner driver
4. OPERATING ENVIRONMENT
(1) System requirements
Host computer Operating system Emulation Plug and play Network
IBM PC/AT or
100% compatible
(Supported ECP mode)
MS-DOS 3.3 + (Printer only)
∗
(2) Interface
Type Host computer Operating system Protocol
IEEE1284P × 1 IBM PC/AT or
MS-DOS 3.3 +
MS-Windows 3.1X or later
MS-Windows 95/98
MS-Windows NT 4.0
100% compatible
Sleek type GDI (Printer)
Twain (Scanner)
MS-DOS 3.3 +
MS-Windows 3.1X or later
MS-Windows 95/98
MS-Windows NT 4.0
Supported Not supported
Peppy
Nibble
ECP
AL-841
[2] SPECIFICATIONS
D. Scanner mode
(1) System requirements
a. Operating conditions
Host computer Operating system Software/Driver Plug and play Network
IBM PC/AT or compatible
(Supported ECP mode)
b. Interface
Type Host computer Operating Protocol
IEEE 1284 P IBM PC/AT or compatible Windows 3.1x ECP
Windows 3.1x Twain driver Supported Not supported
Windows 95/98
Windows NT 4.0
Windows 95/98
Windows NT 4.0
– 1 –
AL-841
[5] EXTERNAL VIEW AND INTERNAL STRUCTURE
B. Internal parts
(1) Parts in each section
c. Optical section
<1> Scanner (reading) section
10)
11)
4) MHPS
8) SL SENSOR
2)
3)
2)
6) CCD SENSOR
5)
7)
9)
1)
4) MHPS
10) 8) SL SENSOR 7) 6) CCD SENS
11) 9) 5) 3)
Parts
No.
Code
1 Scanner lamp
Signal
name
Name Type Function/operation Active condition
Drives the scanner lamp. Maintains
control PWB
the lamp light quantity at a constant
level.
2 Scanner drive wire Transmits the scanner motor power
to the scanner unit.
3 Scanner motor Drives the scanner unit.
4 MHPS MHPS Scanner home
position sensor
Photo
transmission
sensor
Detects the scanner home position.
By this signal the image scanning
operation is controlled.
5 Lens Transfers the document image to
CCD.
6 CCD
SENSOR
CCD OUT CCD (Image)
sensor
CCD Scans the document images (photo
signals) and converts them into
electrical signals.
7 Scanner lamp Radiates light to the document to
allow the CCD to scan the document
images.
8 SL SENSOR PDA/PDK Scanner lamp light
quantity sensor
Photo diode Detects the scanner lamp light
quantity. This signal is inputted to the
scanner lamp control PWB to control
the scanner lamp drive voltage to
maintain a constant level of light
quantity.
9 No. 1 mirror Leads the document image to CCD.
10 No. 2 mirror Leads the document image to CCD.
11 No. 3 mirror Leads the document image to CCD.
OR
Note
HIGH (5V) when
the home position
is detected.
Digital signal (8Bit)
Analog signal
(0 ∼ 0.5V)
– 2 –
AL-841
C. Functional parts
(5) PWB
2)
1)
3)
4)
6)
5)
No.
Name Function/operation
1 Power PWB Outputs DC power. Drives the heater lamp. The voltage specification differs
2 Scanner lamp drive
Controls light quantity of the scanner lamp.
PWB
3 ICU PWB Converts print data set from the host and converts it into bit
image data and send to the MCU.
4 MCU (PCU) PWB Controls the image process section and the engine sect ion.
5 High voltage power
PWB
Outputs the high voltage for the image process section.
Controls the main motor.
6 Operation control PWB Displays the value information. Outputs the key operation
signal.
(11) Adjustment volume
Parts
MODEL Note
depending on the destination.
Allows connection with one
host computers. Printer models
only
1)
VR801
VR601
No.
Code Name Function/operation
Parts
1 VR1 Scanner lamp light quantity adjustment
Adjusts the scanner lamp light quantity.
VR802
volume
2 VR601 Output voltage adjustment vol ume Adjust the DC output voltage (+24V).
VR801 Main charger voltage adjustment volume Adjusts the main charger voltage.
VR802 Developing bias voltage adjustment
Adjusts the developing bias voltage.
volume
– 3 –
Note
AL-841
[6] MACHINE OPERATION
ON
LINE
LAMP
ON OFF — OFF OFF OFF OFF ON
ON ON — OFF OFF OFF OFF ON
Scanner operation
Machine condition
Scanning cannot be
performed. (OFFLINE)
Scanning can be
performed. (ONLINE)
During scan/preview OFF ON — OFF OFF OFF OFF ON
READY
LAMP
[7] ADJUSTMENTS, SETTING
ADJ M9
Location value
∗
Range (MIN) 3.9 V
Range (MAX) 4.1 V
Standard value 4.0 V
Default 4.0 V
Program used
∗
Test command (Simulation) MODE Normal
Copy lamp light quantity adjustment
MAIN CODE 63
SUB CODE 1
3 GREEN
7
SEGMENT
LED
PRE-
JAM
HEAT
LAMP
LAMP
Enforcement time
∗
Enforcement
time
Cycle —
Condition Normal copy exposure is not
Necessary condition
∗
1) The scanner section must be clean.
TONER
CERTRIDGE
REPLACE-
MENT LAMP
S 004/Ua
001/
P 002
DRUM
CERTRIDGE
REPLACE-
MENT LAMP
JOB No Content
Copy
lamp
When replacing the scanner
(copy) lamp control PWB
When replacing the copy lamp
In case of E7 (05) trouble
In case of E7 (04) trouble
In case of E7 (12) trouble
In case of E7 (15) trouble
obtained.
NOTE
Job content
∗
1) Put an oscilloscope between the check point JP2 (VIN) on the
MCU (PCU) PWB and GND.
At that time, trigger with the SH (JP3) signal to see the waveform
correctly.
JP2 (VIN) JP3 (SH)
2) Execute simulation 63-1. (The copy lamp lights up in the scanner
unit home position.)
JP1 (GND)
– 4 –
AL-841
3) Turn and adjust the volume on the copy lamp drive PWB so that
the CCD output waveform max. value is 4.0 ± 0.1 V.
Trouble caused y improper operation
∗
1) E7 (05) trouble
2) E7 (04) trouble
3) E7 (12) trouble
4) E7 (15) trouble
5) Copy exposure cannot be adjusted.
6) Copy exposure abnormality
Preliminary work
∗
JOB No Content
S 004 Scanner (reading) section cleaning
After-work
∗
JOB No Content
ADJ M1 Copy exposure adjustm ent
Necessary tools
∗
Name Oscilloscope
Parts code/Price rank —
4.0±0.1V
[8] SIMULATION (Test Command) ⋅ USER PROGRAM
(2) Simulation list
Code
Main Sub
22 4 Used to check the number of total mis-feed (jam) in the
machine.
14 Used to check the ROM version. Others Software
17 Used to check the copy count number. Operation data output/
18 Used to check the print count number. Operation data output/
21 Used to check the frequency of use (scanning) of the
scanner (reading).
24 1 Used to clear the mis-feed (jam) counter in the machine. Data clear Counter
8 Used to clear the copy counter. Data clear Counter Copier
9 Used to clear the print counter. Data clear Counter Printer
26 2 Used to set Enable/Disable of the SPF and the FAX
functions. (When a trouble occurs in the SPF and the
FAX section, disable those functions to allow only copying
and scanning functions.
6 Used to set the specifications depending on destination. Setting Specifications Destination
7 Used to set the model (hardware) specifications. Setting PCU Specifications Operation mode
Function (Purpose) Purpose Section Item
Operation data output/
Check (Display/Print)
Check (Display/Print)
Check (Display/Print)
Operation data output/
Check (Display/Print)
Setting ADF/RADF/UDH/SPF Specifications
Optical (Image
scanning)
Trouble Misfeed
Counter Copier
Counter Printer
Counter Scanner
(3) Details of simulations
22
22-4
22-14
(Common)
Purpose Operation data output/Check (Display/Print)
Function
(Purpose)
Used to check the number of total mis-feed (jam) in
the machine.
Item Trouble Misfeed
Operation/
Procedure
The JAM counter value is displayed in 3 digits × 2
times.
Display example: 12345
012 → Blank → 345 → Blank → 012
0.7s 0.3s 0.7s 1.0s 0.7s
Purpose Others
Function
(Purpose)
Section PCU
Item Software
Operation/
Procedure
– 5 –
Used to check the ROM version.
The ROM version on the MCU PWB is displayed in 3
digits on the copy quantity display.
If any trouble occurs in the software operation, check
the version with this simulation.
AL-841
22-17
Purpose Operation data output/Check (Display/Print)
Function
(Purpose)
Item Counter Copier
Operation/
Procedure
Used to check the copy count number.
The display format and the method are same as SIM
22-5 (Total printer counter display).
22-18
Purpose Operation data output/Check (Display/Print)
Function
(Purpose)
Item Counter Printer
Operation/
Procedure
Used to check the print count number.
The display format and the method are same as SIM
22-5 (Total printer counter display).
22-21
Purpose Operation data output/Check (Display/Print)
Function
(Purpose)
Section Optical (Image scanning)
Item Counter
Operation/
Procedure
Used to check the count of use (count of scanning)
of the scanner (reading) unit.
The display system and the method are the same as
those of SIM 22-5 (Total print counter display).
24
24-1
Purpose Data clear
Function
(Purpose)
Item Counter
24-8
Purpose Data clear
Function
(Purpose)
Item Counter Copier
24-9
Purpose Data clear
Function
(Purpose)
Item Counter Printer
Used to clear the mis-feed (jam) counter in the
machine.
Used to clear the copy counter.
Used to clear the print counter.
26
26-2
Purpose Setting
Function
(Purpose)
Section ADF/RADF/UDH/SPF
Item Specifications
Operation/
Procedure
Enter the desired code number corresponding to Enable/Disable
setup and press the Start button, and the setup will be effective.
26-6
Purpose Setting
Function
(Purpose)
Item Specifications
Operation/
Procedure
2) To change the set content, enter the code of your desired
setting and press the start button.
Destination code Detected paper size
Set
value
0
1 EX Japan
2 Japan
When the set value is changed, the paper size specification and the
fixed, enlarged, and reduced copy magnification ratios are changed.
26-7
Purpose Setting
Function
(Purpose)
Section PCU
Item Specifications Operation mode (Common)
Operation/
Procedure
Used to set Enable/Disable of the SPF and the FAX
functions. (When a trouble occurs in the SPF and the
FAX section, disable those functions to allow only
copying and scanning functions.
When this simulation is executed, the code of current
setup of ENABLE/DISABLE of SPF/FAX function is
displayed.
Set code number SPF/FAX function
0 Disable
1 Enable
Used to set the destination.
1) The currently set code of the destination is
displayed.
Destination
Used to set the model (hardware) specifications.
When this simulation is executed, the monitor lamp
corresponding to the model (hardware) is displayed.
Copy quantity display Copy speed (CPM)
66cpm
88cpm
Paper
type
Inch
series
AB
series
AB
series
Paper width
detector ON
11 5 8.5/
14 5 8.5
A4 (210 5
356 mm)
A4 (210 5
356 mm)
Paper width
detector OFF
8.5 5 5.5/
8.5 5 11
A5
B5
– 6 –
AL-841
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