Sharp AM 900 - Digital Office Laser Copier User manual

SERVICE MANUAL
AM-900U
No. 00ZAM900U/SME
DIGITAL MULTIFUNCTIONAL SYSTEM
AM-900
MODEL
SHARP CORPORATION
CONTENTS
Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for
maintaining the safety and performance of the set.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
CHAPTER 1. GENERAL DESCRIPTION
[1] Specifications ................................................. 1-1
[2] Operation panel.............................................. 1-2
[3] Transmittable documents ............................... 1-3
[4] Installation ...................................................... 1-4
CHAPTER 2. ADJUSTMENTS
[1] Adjustments ................................................... 2-1
[2] Diagnostics and service soft switches............ 2-7
[3] Troubleshooting ........................................... 2-30
[4] Error code table............................................ 2-31
CHAPTER 3. MECHANICAL DESCRIPTION
[1] Mechanical description................................... 3-1
[2] Disassembly and assembly procedures....... 3-18
CHAPTER 4. DIADRAMS
[1] Block diagram ................................................ 4-1
[2] Wiring diagram ............................................... 4-2
[3] Point-to-point diagram.................................... 4-3
CHAPTER 5. CIRCUIT DESCRIPTION
[1] Circuit description........................................... 5-1
[2] Circuit description of control PWB.................. 5-1
[3] Circuit description of LIU PWB..................... 5-19
[4] Circuit description of power supply
PWB ............................................................5-21
[5] Circuit description of CIS unit ......................5-22
[6] Circuit description of operation panel
PWB ............................................................5-23
[7] Data flow chart.............................................5-24
[8] Troubleshooting ...........................................5-25
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
LAYOUT
[1] Control PWB circuit .......................................6-1
[2] LIU PWB circuit ...........................................6-14
[3] Power Supply PWB circuit...........................6-17
[4] High Voltage PWB circuit.............................6-19
[5] Operation Panel PWB circuit .......................6-22
CHAPTER 7. OPERATION FLOWCHART
[1] Protocol .........................................................7-1
[2] Power on sequence.......................................7-2
CHAPTER 8. OTHER
[1] Service tools ..................................................8-1
[2] Rewriting version up the FLASH ROM ..........8-2
Parts Guide
MODEL SELECTION CODE DESTINATION
AM-900 U U.S.A./Canada

– i –
CAUTION
This laser facsimile is a class 1 laser product that complies with 21CFR 1040.10 and 1040.11 of the CDRH or IEC60825-1 standard.
This means that this machine does not produce a hazardous laser radiation. The use of controls, adjustments or performance of pro-
cedures other than those specified herein may result in hazardous radiation exposure.
This laser radiation isn't a danger to the skin, but when an exact focusing of the laser beam is achieved on the eyes retina, there is
danger of spot damage to the retina.
The following cautions must be observed to avoid exposure of the laser beam to your eyes at the time of servicing.
1) When a problem in the laser optical unit has occurred, the whole optical unit must be exchanged as a unit, not an individual part.
2) Do not look into the machine with the main switch turned on after removing the toner/developer unit and drum cartridge.
3) Do not look into the laser beam exposure slit of the laser optical unit with the connector connected when removing and installing
the optical system.
4) The cover of Laser Printer Unit contains the safety interlock switch.
Do not defeat the safety interlock by inserting wedges or other items into the switch slot.
Laser Wave Length : 780 nm +15/-10 nm
Laser Pulse Times : 12.00 µs/7 mm
Laser Output Power : 0.4 mW ± 0.04 mW
Life of consumable
Section Part Estimated Life Replaced by
Toner cartridge Replacement cartridge
(AM-90ND)
3,000 prints
(at Letter/5% chart)
User
Drum cartridge Replacement cartridge
(AM-90DR)
20,000 prints
(at Letter/5% chart)
User
Paper feed Transfer roller (Refer to the P/G No. 3-19)
(NROLR2525XHZZ)
50,000 prints Service Engineer
Fuser Fusing unit (Refer to the P/G No. 5-901)
(DUNTK273DXH01)
50,000 prints Service Engineer
Paper transport Feed roller (Refer to the P/G No. 3-29)
(NROLR2333XHZZ)
Cleaning as needed ——————
Unit AM-900 5 years or 50,000 prints of early
either
——————
1. Employing lead-free solder
This model employs lead-free solder.
This is indicated by the "LF" symbol printed on the PWB and in the service manual.
The suffix letter indicates the alloy type of the solder.
Example:
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free solder
When repairing a PWB with the "LF" symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder may
result in cold soldered joints and damage to printed patterns.)
As the melting point of lead-free solder is approximately 40°C higher than tin/lead alloy solder, it is recommended that a
dedicated bit is used, and that the iron temperature is adjusted accordingly.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer melting point (flow), to prevent damage to the
land of the PWB, extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time.
Remove the bit as soon as a good flow is achieved.
The high content of tin in lead free solder will cause premature corrosion of the bit.
To reduce wear on the bit, reduce the temperature or turn off the iron when it is not required.
Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their
characteristics, making good soldering more difficult.
It will be necessary to clean and replace bits more often when using lead-free solder. To reduce bit wear, care should be
taken to clean the bit thoroughly after each use.
PRECAUTIONS FOR USING LEAD-FREE SOLDER
AM-900U

AM-900U
1 – 1
FAXAM-900UService ManualService ManualMarketE
CHAPTER 1. GENERAL DESCRIPTION
[1] Specifications
1. Print specifications
2. Copy specifications
3. Fax specifications
4. Scanning specifications
5. General specifications
Trademark information
Printer type:
Toner cartridge yield*:
(continuous printing, 5%
page coverage, letter
paper)
Drum cartridge yield*:
(continuous printing, 5%
page coverage, letter
paper)
PC print speed:
Resolution:
Laser
Initial starter cartridge (included with
machine): Approx. 1500 pages
Replacement cartridge AM-90ND:
Approx. 3000 pages
Initial starter cartridge (included with
machine): 20,000 pages (average)
Replacement cartridge AM-90DR:
20,000 pages (average)
12 ppm (pages per minute)
600 x 600 dpi (dots per inch)
* The yields may vary depending on coverage and operating condi-
tions.
Copy speed:
Copy quality settings:
Copy resolution settings:
Enlargement/Reduction:
Contrast settings:
Halftone (grayscale):
Multiple copies:
Maximum copy size:
12 cpm (copies per minute)
Text, Photo, Text/Photo
300 dpi, 600dpi
25% to 400%
5 levels
256 levels
Max. 99 copies per original
Document glass: Letter (8.5 x 11 in.)
Auto document feeder: Legal (8.5 x 14
in.)
Automatic dialing:
Modem speed:
Transmission time*:
Communication method:
Compression scheme:
Transmission method:
Memory size*:
Resolution:
Halftone (grayscale):
Reception modes:
100 Speed Dial numbers
33,600 bps with automatic fallback to
lower speeds (lowest speed 2400 bps)
Approx. 3 seconds
Super G3, G3
MMR, MR, MH
Dither
2 MB (approx. 125 average letter
pages)
Horizontal: 203 lines/inch (8 dots/mm)
Vertical: Standard: 98 lines/inch
(3.85 lines/mm)
Fine/Halftone: 196 lines/inch
(7.7 lines/mm)
Super fine: 391 lines/inch
(15.4 lines/mm)
256 levels
FAX ONLY, EXT. TEL
* Based on Sharp Standard Chart at standard resolution, excluding
time for protocol signals (i.e., ITU-T phase C time only).
Scanner type:
Resolution:
Scan speed:
Compatibility:
Grayscale:
Color:
CIS (Contact Image Sensor)
300/600 x 300 dpi, 300/600 x 600 dpi
Black and white:
300/600 x 300 dpi: 6 sec/page
300/600 x 600 dpi: 12 sec/page
Color and grayscale:
300/600 x 300 dpi: 18 sec/page
300/600 x 600 dpi: 36 sec/page
TWAIN, WIA
256 levels
24-bit color
Auto document feeder:
Computer connection:
Effective scanning width:
Effective printing width:
Display:
Paper tray capacity:
(letter-size plain paper)
Power requirements:
Operating temperature:
Humidity:
Power consumption:
Dimensions:
Weight:
Letter size: 20 sheets max. (20 lbs.)
Legal size: 1 sheet max. (20 lbs.)
USB 1.0/1.1 or 2.0 port (USB 1.0/1.1 or
2.0 cable must be purchased sepa-
rately)
8.2” (208 mm) max.
8.2” (208 mm) max.
16-digit LCD display
250 sheets (20 lbs.)
(At room temperature and normal
humidity)
120 V AC, 60 Hz
50 - 86°F (10 - 30°C)
20 - 85% RH
Idle: 10 W
Maximum: 690 W
Width: 18.7" (475 mm)
Depth: 16.5" (420 mm)
Height: 14.6" (370 mm)
Approx. 28.0 lbs. (12.7 kg) (including
trays and toner and drum cartridges)
As a part of our policy of continuous improvement, SHARP reserves the right to make design and specification changes for product improvement
without prior notice. The performance specifications figures indicated are nominal values of production units. There may be some deviations from
these values in individual units.
•Microsoft, Windows and Internet Explorer are trademarks of Microsoft Corporation in the
U.S.A. and other countries.

AM-900U
1 – 2
[2] Operation panel
147
23
1. Display
This displays messages and prompts to help you operate the
machine.
2. ZOOM key
Press this key to select an enlargement or reduction setting
when making a copy.
3. E-SORT key
Press this key when making multiple copies to have the
copies collated (sorted into sets with the pages ordered 1, 2,
3..., 1, 2, 3..., etc.).
4. QUALITY key
When making a copy, press this key to select the type of
original you are copying (TEXT, PHOTO). When sending a
fax, press this key to select a resolution setting.
5. Right/left arrow keys
When making a copy, press either of these keys after
selecting an enlargement/reduction setting with the ZOOM
key to increase or decrease the setting by 1%. When sending
a fax, press either of these keys to search through your auto-
dial fax numbers.
6. MENU key
Press this key, followed by the left or right arrow key, to
access special functions and settings.
7. CONTRAST key
Press this key to select a contrast setting when making a copy
or sending a fax.
8. REDIAL key
Press this key followed by the Start key to automatically redial
the last number dialed.
9. Stop key
Press this key to cancel operations before they are completed.
10. COPY key
Press this key to select copy mode.
11. SCAN key
Press this key to select scan mode.
12. HELP (FAX key and SCAN key)
Press the FAX key and SCAN key simultaneously to print the
HELP list, a brief guide to the operation of the machine.
13. FAX key
Press this key to select fax mode. When in fax mode, press
this key to select the Line Monitor function.
14. Alarm indicator
This blinks when the toner cartridge nears empty or the drum
cartridge is near or at the end of its life. This lights steadily
when the toner cartridge is empty, the machine is out of
paper, the print compartment cover is open, or when a paper
jam has occurred (a message will appear to indicate the
problem).
15. DUPLEX SCAN key
Press this key to copy or fax multiple two-sided pages.
16. PRINT STOP key
Press this key to cancel a print job sent to the machine from a
computer.
17. ENTER key
Press this key to enter or select a setting.
18. BROADCAST key
Press this key to send the same fax to multiple destinations.
19. SPEED key
Press this key to dial a fax number using an abbreviated 2-
digit Speed Dial number.
20. Number keys
Use these keys to enter the number of copies, dial fax
numbers, and enter numbers and letters when storing auto-
dial numbers.
21. Start key
Press this key when you are ready to begin copying, faxing,
or scanning. The key can also be pressed in the date and
time display of fax mode to show the percentage of memory
currently used.
10
5
11 1213 14
6
15 16
8
17 18 19
9
20
CONTRAST
REDIAL
BROADCAST
SPEED
QUALITY
E-SORT
ZOOM
PRINT STOP DUPLEX SCAN
MENU
ENTER
ZA
COPY SCAN FAX
!
HELP
21

AM-900U
1 – 3
[3] Transmittable documents
1. Document Sizes
Use document carrier sheet for smaller documents.
• With special sizes, only one sheet can be fed into the machine at a
time. Insert next page into feeder as current page is being scanned.
2. Paper Thickness & Weight
3. Document Types
• Normal paper
Documents handwritten in pencil (No. 2 lead or softer), fountain
pen, ball-point pen, or felt-tipped pen can be transmitted.
Documents of normal contrast duplicated by a copying machine
can also be transmitted.
• Diazo copy (blue print)
• Diazo copy documents of a normal contrast may be transmitted.
• Carbon copy
A carbon copy may be transmitted if its contrast is normal.
4. Cautions on Transmitting Documents
• Documents written in yellow, greenish yellow, or light blue ink can-
not be transmitted.
• Ink, glue, and correcting fluid on documents must be dry before the
documents can be transmitted.
• All clips, staples and pins must be removed from documents before
transmission.
• Patched (taped) documents should be copied first on a copier and
then the copies used for transmission.
• All documents should be fanned before insertion into the feeder to
prevent possible double feeds.
5. Automatic Document Feeder Capacity
Number of pages that can be placed into the feeder at anytime is as
follows:
Normal size: max. ADF 20 pages
Special size: single sheet only (manual feed)
NOTE: •When you need to send or copy more pages than the feeder
limit, place additional pages in feeder when last page in feeder
is being scanned.
•Place additional pages carefully and gently in feeder.
If force is used, double-feeding or a document jam may result.
6. Readable Width & Length
The readable width and length of a document are slightly smaller than
the actual document size.
Note that characters or graphics outside the effective document scan-
ning range will not be read.
•Readable width
8.2” (208mm), max
•Readable length
This is the length of the document sent minus 0.16” (4mm) from the
top and bottom edges.
Normal size Width 5.8” - 8.5”(148 - 216 mm)
Length 5.8” - 11”(148 - 279 mm)
10 sheets 1 sheet(Manual)
Paper weight 21.5 lbs.
(80 g/m2)
14 lbs. ~ 42 lbs.
(52 g/m2~ 157g/m2)
Paper thickness (ref.) 0.1 mm 0.1 mm ~ 0.18mm
Paper size LGL (216 mm x 355.6 mm)
A4 (210 mm x 297 mm)
LTR (216 mm x 279 mm)
Feeder capacity A4/LTR: 10 sheets max.
LGL : 1 sheet max.
(Min.)
(Max.)
LETTER
size
(Max.)
148mm
279mm
600m
m
148mm 216mm
[Normal size]
216mm
[Special size]
Readable widt
h
0.16" (4mm)
0.16" (4mm)
Readable length

AM-900U
1 – 4
[4] Installation
1. Site selection
Take the following points into consideration when selecting a site for
this model.
ENVIRONMENT
• The machine must be installed on a level surface.
• Keep the machine away from air conditioners, heaters, direct sun-
light, and dust.
• Provide easy access to the front, back, and sides of the machine.
In particular, keep the area in front of the machine clear, or the orig-
inal document may jam as it comes out after scanning.
• The temperature should be between 50 - 86°F (10 - 30°C).
• The humidity should be between 20% and 85% (without conden-
sation).
ELECTRICITY
AC 120V, 60Hz, grounded AC (3-prong) outlet.
Caution!
• Connection to a power source other than that specified will cause
damage to the equipment and is not covered under the warranty.
• If your area experiences a high incidence of lightning or power
surges, we recommend that you install a surge protector for the
power and telephone lines. Surge protectors can be purchased at
most telephone specialty stores.
If the machine is moved from a cold to a warm place...
Condensation may form on the reading glass if machine is moved from
a cold to a warm place, this will prevent proper scanning of documents
for transmission. Turn on the power and wait approximately 2 hours
before using machine.
TELEPHONE JACK
A standard telephone jack must be located near the machine. This is
the telephone jack commonly used in most homes and offices.
• Plugging the fax machine into a jack which is not jack may result in
damage to the machine or your telephone system. If you do not
know what kind of jack you have, or need to have one installed,
contact the telephone company.
2. Attaching the trays
1) Attach the document feeder tray.
Slide the output tray into the machine as shown. When it stops, lift
the end slightly and push in so that the tray locks in place.
Important: The output tray must be attached correctly or the
machine will not operate.
2) Releasing the scanner.
Before plugging in the power cord, pull the scanner release toward
you to release the scanner lock.
•Caution: Plugging in the power cord without releasing the scan-
ner lock may damage the machine.
•In the event that you need to move the machine, push the release
back in to lock the scanner before moving (push the release in after
you have unplugged the power cord).
3) Connecting the power cord.
Plug the power cord into a 120 V, 60 Hz, grounded AC (3-prong)
outlet.
•Caution: Make sure the scanner has been released as explained
on the previous page before plugging in the power cord.
•Do not plug the power cord into any other kind of outlet. This will
damage the machine and is not covered under the warranty.
•The machine does not have a power on/off switch. The power is
turned on and off by simply plugging in or unplugging the power
cord.
•If you area experiences a high incidence of lightning or power
surges, it is recommended that you install surge protectors for the
power and telephone lines. Surge protectors can be purchased
from your dealer or at most telephone specialty stores.
If you will be
using legal paper,
pull out the tray
extension.

AM-900U
1 – 5
4) Connecting the telephone line cord.
Insert one end of the line cord into the socket on the back of the
machine marked TEL. LINE. Insert the other end into a wall tele-
phone socket.
Make sure that the line cord is inserted into the TEL LINE jack. Do
not insert it into the TEL. SET jack!
Important: The facsimile function of this machine is not designed
for use on a line which has call waiting, call forwarding, or certain
other special services offered by your telephone company. If you
attempt to use the facsimile function in conjunction with any of
these services, you may experience errors during transmission and
reception of facsimile messages.
The facsimile function of this machine is not compatible with digital
telephone systems.
3. Installing the toner cartridge and drum cartridge
The laser printer in the machine uses a toner cartridge and drum car-
tridge.
• The starter toner cartridge included with the machine can print
approximately 1,500 letter-size pages at 5% page coverage.
• When replacing the toner cartridge, use a SHARP AM-90ND toner
cartridge. One cartridge can print about 3,000 letter-size pages at
5% coverage.
• The drum cartridge can print approximately 20,000 letter-size
pages. When replacing the drum cartridge, use a SHARP AM-
90DR drum cartridge.
Follow the steps below to install the toner cartridge and the drum car-
tridge.
Note: The quality of the toner cartridge is guaranteed for 18 months
after the date of manufacture indicated on the package. The quality of
the drum cartridge is guaranteed for 24 months after the date of manu-
facture indicated on the package.
1) Press the side cover release , open the side cover ,
and then open the front cover .
•Caution! The fusing unit inside the print compartment becomes
very hot during operation. Do not touch the inside of the print com-
partment after the machine has been in operation.
2) Remove the new drum cartridge from its packaging, and remove
the tape from the top of the cartridge.
3) Insert the drum cartridge into the print compartment, sliding it along
the guides.
•Do not touch or allow other objects to contact the drum (the green
cylinder). This may damage the drum. If fingerprints, dust, or other
contaminants get on the drum, wipe it gently with a clean cloth.
•Exposure to light for more than several minutes will damage the
drum. Be sure to insert the drum cartridge promptly into the
machine.
•If you find it necessary to leave the cartridge out of the machine
for move than several minutes, wrap the cartridge in black paper.
4) Remove the new toner cartridge from its packaging. Shake the car-
tridge side to side four or five times to distribute the toner evenly
within the cartridge.
TEL.
LINE
TEL.
SET
Setting the dial mode:
The machine is set for tone dialing. If you are on a pulse dial line, you must set
the fax machine for pulse dialing. Press the keys on the operation panel as
follows:
1Make sure that the date and time
display of fax mode appears (if needed
press ) and then press
2Press .
3Press .
4Select the dial mode:
TONE: PULSE:
5Press repeatedly to exit.
FAX MENU
Display:
The display briefly shows
your selection, then:
1:TONE
FAX SETTING
5: RINGER VOLUME
1: DATE&TIME SET
12
3
1
2
3
Grasp this handle to
push the cartridge in.

AM-900U
1 – 6
5) Grasp the cartridge handle and insert the toner cartridge into the
print compartment, sliding it along the guides.
•After inserting the cartridge, press on the arrow mark to mark sure
it “clicks” into place.
•Do not touch the roller in the toner cartridge.
6) Close the front cover and then the side cover .
•Make sure the side cover is completely closed. Otherwise, light
may enter the print compartment and damage the drum.
7) If you installed a new toner cartridge, press to select YES
(this will reset the toner counter to zero).
•If you temporarily removed and then replaced an old toner car-
tridge for maintenance or other reason, press to continue
using the previous toner count. (Note: Be sure to press ,
or the machine will not alert you when the toner cartridge is out of
toner.)
8) Press .
9) If you installed a new drum cartridge, reset the drum counter as
explained below.
4. Resetting the drum counter
Each time you install a new drum cartridge, follow the steps below to
reset the drum counter to zero.
5. Manually resetting the toner counter
When a new toner cartridge is installed, the toner counter is reset in
Step 7 on the previous page. The procedure below is normally not nec-
essary; however, it can be used in the event that you need to reset the
toner manually.
6. Loading printer paper
You can load up to 250 sheets of letter or legal paper (max. 20lbs.) in
the paper tray.
Caution! Do not use the blank side of paper that has already been
printed on.
1) Remove the output tray.
Press on this mark to
make sure the cartridge
"clicks" into place.
Grasp this
handle to
insert the
cartridge.
12
2
1
1=YES,2=NO
TONER EXCHANGED?
Display:
NEW TONER?
OK: PRESS START
1Press and then or
repeatedly until the display at right
appears.
MENU ZA
Display:
LIFE
2Press .
3Press .
4Press repeatedly to exit.
CLEAR: START KEY
DRUM COUNTER
1: LIFE COUNTER
1Press and then or
repeatedly until the display at right
appears.
2Press .
3Press .
4Press repeatedly to exit.
MENU ZA
Display:
CLEAR: START KEY
LIFE
TONER COUNTER
3: CLR DRUM COUNT

AM-900U
1 – 7
2) Insert a stack of paper into the tray, print side up.
•Important! The stack of paper must not be higher than the paper
height line on the paper tray.
3) Squeeze the sides of the paper guide as shown and slide it to the
slot for the length of the paper you are loading.
4) Replace the output tray.
•If you loaded legal size paper (or you changed the paper size),
change the paper size setting as explained below.
7. Setting the paper size
The machine has been set at the factory to use letter size paper. If you
loaded legal size paper, you must change the paper size setting to
LEGAL.
8. Installing the software
To use the machine as a printer and scanner for your computer, you
must install the software and connect a USB cable. The CD-ROM that
comes with the machine contains the following software:
•MFP Drivers: These consist of the printer driver that allows the
machine to be used as a printer, and the scanner driver that allows
you scan using TWAIN and WIA compliant applications.
•Sharpdesk: This is an integrated software environment that makes
it easy to manage image files and launch applications. (Note that
Internet Explorer 5.5 or higher is required to install Sharpdesk; if
this is not installed, you will be prompted during the installation pro-
cedure to install Internet Explorer 6.0SP1®from the CD-ROM.)
Minimum system requirements
Operating system: Windows 98 SE®/ Me®/ 2000®/ XP®
Port: USB 2.0 or 1.1 port
Display: 800 x 600 (SVGA) with 256 colors or more
Free hard-disk space: 150 MB or more
Other requirements: An environment in which the operating
system can freely operate.
Comments:
• USB 2.0 Hi-Speed is only possible if your computer has a USB 2.0
port and you are using a USB 2.0 cable. In addition, the Microsoft
USB 2.0 driver must be preinstalled in your computer, or the USB
2.0 driver for Windows 2000/XP®provided through Windows
Update must be installed. Note that USB 2.0 Hi-Speed is not possi-
ble in Windows 98 SE®or Me®.
• To scan a legal size document (the maximum size) at 1200 dpi in
full color, at least 600 MB or more of free hard disk space is
required on the drive where your operating system is installed.
Installing the software
• A USB cable is required to connect the machine to your computer.
Please purchase a USB 2.0 or USB 1.0/1.1 cable. (If you wish to
use USB 2.0 Hi-Speed mode and your system meets the require-
ments for Hi-Speed mode, purchase a USB 2.0 cable.) The USB
cable will be connected during the software installation procedure.
• To install the software on Windows 2000/XP®using the installer,
you must log in with administrator’s rights.
• The windows shown in the following procedure appear in Windows
XP®. The windows that appear in other versions of Windows may
be slightly different.
1) Make sure that the USB cable is not connected to your computer.
(The cable will be connected in Step 10.)
•If the USB cable is connected, a Plug and Play window will
appear. Click the Cancel button to close the window and discon-
nect the cable.
2) Insert the Sharp CD-ROM into your computer’s CD-ROM drive.
3) In Windows XP®, click the start button, click My Computer, and
then double-click the CD-ROM icon.
In Windows 98/Me/2000®, double-click My Computer on the desk-
top and then double-click the CD-ROM icon.
4) Double-click the setup icon ( ) in the CD-ROM window.
5) Follow the instructions in the windows that appear.
•When the Setup Type Selection window appears, select Stan-
dard to install all of the software components (this should normally
be selected). If you only wish to install certain components, select
Custom and then select the components that you wish to install.
Note: If you wish to select the folder where Sharpdesk is installed,
select Custom.
Paper height line
1Press (or ) and then .
2Press .
3Select the paper size:
LETTER: LEGAL:
4Press repeatedly to exit.
COPY SCAN MENU
The display briefly shows
your selection, then:
1:LETTER
Display:
COMMON SETTING
2: AUTO CLEAR

AM-900U
1 – 8
•In Windows 2000/XP®, if a warning message appears at any time
regarding the Windows logo test or digital signature, be sure to
click Continue Anyway or Yes.
6) When the Finish window appears to indicate that the selected
packages have been installed, click Close.
7) If the installation was a Standard installation, the following window
will appear. Click OK.
•If you installed the MFP drivers using a Custom installation and
did not install Sharpdesk, the following window will appear. Click
OK and go to Step 10.
8) The following window will appear. Click Yes to restart your com-
puter.
9) The Search Setup Wizard will appear. Follow the on-screen instruc-
tions to create an index database for Sharpdesk.
10)Make sure that the power cord of the machine is not plugged in
(the machine is powered off), and then connect the USB cable.
•Insert one end of the USB cable into the USB port on the machine
and the other end into your computer’s USB port.
Note: Do not connect the AM-900 to a hub to which another AM-
900 is connected. If this is done, the AM-900 will not operate cor-
rectly.
11)Plug in the power cord of the machine.
•Windows XP®:Go to the procedure for completing installation of
the software.
•Windows 2000®:This completes the installation of the software.
Note: If a warning message regarding the Windows logo test
appears (the warning may appear twice), click Yes each time the
window appears. This will complete the installation of the software.
•Windows Me®/98SE®:This completes the installation of the soft-
ware.
Completing installation of the software on Windows XP®
(Continued from Steps 10 and 11.)

AM-900U
1 – 9
12)In Windows XP®, the Found New Hardware Wizard will appear.
Make sure that Install the software automatically (Recom-
mended) is selected and click Next (this will install software for
using the machine as a scanner).
•Note for Windows XP SP2®:The following window will appear
first. Select No, not this time and click Next. Continue from the
above window.
•If the following warning message appears regarding the Windows
logo test, click Continue Anyway.
13)When the wizard finishes installing the scanner software, click Fin-
ish to close the wizard.
14)After a brief interval, the Found New Hardware Wizard will appear
again to install software for using the machine as a printer. Make
sure that Install the software automatically (Recommended) is
selected and click Next.
•If the following warning appears regarding the Windows logo test,
click Continue Anyway.
15)When the wizard finishes installing the printer software, click Finish
to close the Wizard. This completes the installation of the software
on Windows XP®.
Sharpdesk online guide
For information on using Sharpdesk, view the Sharpdesk online
guide on the CD-ROM. To view the online guide, open the Manual
folder and then the EnglishA folder on the CD-ROM, and double-
click SDUG_Enu.pdf.
Removing the software
In the event that you need to remove the software from your com-
puter, open the Control Panel and select Add or Remove Pro-
grams (or Add/Remove Programs). Select SHARP AM-900
Series MFP Driver (or Sharpdesk) from the list, and click the
Change/Remove button (or the Add/Remove button). When
prompted to confirm the removal, click OK.

AM-900U
1 – 10
9. Clearing a jammed document
If the original document doesn’t feed properly during transmission or
copying, or DOCUMENT JAMMED appears in the display, first try
pressing . If the document doesn’t feed out, open the auto
document feeder cover and remove it.
Important:
Do not try to remove a jammed without opening the auto document
feeder cover. This may damage the feeder mechanism.
1) Squeeze the cover release and open the auto document
feeder cover. Open the document glass cover.
2) Remove the document.
• The document can be removed from either the top or the bottom
slot, whichever is easiest.
3) Close the auto document feeder cover, pressing down on both
sides to make sure it clicks into place.
10. Clearing jammed printing paper
1) Press the side cover release and then open the side cover
.
2) Push the two heater roller release levers down to release the
heater roller.
•Caution! The fusing unit (indicated in white at right) becomes
very hot during operation. Do not touch the fusing unit.
3) If the jammed page is protruding from the side of the machine, gen-
tly pull it out. Take care not to tear the paper or leave any torn
pieces of paper in the print compartment.
•If this clears the jam, go to Step 5.
•If you are unable to clear the jam in this way, go to Step 4.
•Take care not to touch or allow other objects to contact the drum
(the green cylinder). This damage the drum.
1
1
Press down
on the marks
1
2
1
2

AM-900U
1 – 11
4) If the jammed page cannot be pulled out directly, open the front
cover and rotate the white knob in the direction
shown to feed the jammed page out into the output tray.
5) After the jammed page has been removed, push the two heater
roller release levers back up.
6) Close the front cover (if you opened it) and then the side
cover .
12
2
1
1
2
2
1

AM-900U
1 – 12
11. Troubleshooting
1. Display
2. Audible signals
3. Printer error code (Troubleshooting Refer to page 5-26 to 5-28)
SYSTEM ERROR [P1] The roller sensor could not detect its home position
after driving the pick up motor for the specified period.
SYSTEM ERROR [P2] The printer controller detected the optical unit (LSU)
error.
SYSTEM ERROR [P3] Thermistor error was detected.
SYSTEM ERROR [P4] ROM or RAM error was detected on the printer
control unit.
SYSTEM ERROR [P5] High temperature error was detected.
SYSTEM ERROR [P6] Low temperature error was detected.
SYSTEM ERROR [P7] Communication error between the main controller
and the printer controller was detected.
The roller sensor could not become NOT-Active after
passing the specified period from picking up paper.
The external interrupt signal for optical unit (LSU) or
High-voltage control did not become active after
passing the specified period.
4. Scanner error code (Troubleshooting Refer to page 5-28)
ADD PAPER Check the printing paper. If the tray is empty, add
paper. If there is paper in the tray, make sure it is
inserted correctly (take out the stack, align the edges
evenly, and then reinsert it in the tray). Printing will
resume automatically when the output tray is
replaced.
BYPASS MISFEED The paper is not inserted correctly in the bypass tray.
Remove the paper and insert it again.
BYPASS PAPER! /
IF COPY, PRESS
(alternating messages)
Paper has been inserted in the bypass tray. If the
paper has been inserted for a copy job, press to
set the paper size. If the paper is for a print job, the
message can be disregarded.
COVER OPEN One or both of the print compartment covers are
open. Make sure both covers are closed.
DATE/TIME UNSET The date and time need to be set. Note
that the date and time settings will be lost if the
machine is unplugged or a power failure occurs.
DOCUMENT JAMMED The original document is jammed. See the following
section, Clearing Paper Jams. Document jams will
occurifyouloadmorethan20pagesatonceorload
documents that are too thick.
The document may also jam if the receiving machine
doesn’t respond properly when you attempt to send a
fax.
DOCUMENT READY A document has been inserted in the auto document
feeder and the machine is waiting for you to begin
faxing, copying, or scanning.
DRUM LIFE OVER This appears when the drum cartridge needs
replacement.
A
FAX RX IN MEMORY A fax has been received in memory because the
toner cartridge needs replacement, you have run out
of printing paper, the paper is jammed, or paper is
inserted in the bypass tray. The fax will print out
automatically when the problem is fixed.
GRP. SPACE FULL This appears if you attempt to store a Group when
both Groups are already programmed.
LINE ERROR Transmission or reception was not successful. Press
the STOP key to clear the message and then try
again. If the error persists, see Line error.
MEMORY IS FULL If faxes have been received to memory because
printing is not possible (an additional message will
indicate the problem), resolve the problem so that
printing can continue (see Substitute Reception to
Memory)
If you are attempting to send a fax, see If the memory
becomes full.
If you are copying, see If MEMORY IS FULL appears.
MEMORY PRINTING The machine is preparing to or printing out a
document from memory.
NO # STORED This appears if you attempt to search for a Speed Dial
number when none have been stored.
OFF HOOK This appears when an extension phone connected to
the machine is lifted. Only can be pressed in
fax mode when this message appears.
OUTPUT TRAY OFF The output tray is not attached correctly. Attach it as
explained. The machine will not operate if the output
tray is not attached correctly.
PAPER JAMMED The printing paper is jammed.
REMOVE /
BYPASS PAPER
(alternating messages)
A fax has been received to memory because paper is
inserted in the bypass tray (faxes cannot be printed
while paper is in the bypass tray). Remove the paper
from the bypass tray to allow the fax to be printed.
SET BYPASS PAPER /
SIZE: XXXX
(alternating messages; a
paper size appears in
“XXXX”)
Paper must be inserted in the bypass tray for a print
job or copy job that requires use of the bypass tray.
Insert the indicated size of paper in the tray.
SYSTEM ERROR [XX]
(a number appears in
“XX”)
(Refer to Printer error code/
Scanner error code)
If this message appears, unplug the power cord, wait
about 10 seconds, and then plug it back in. If the
message still appears, unplug the power cord and call
SHARP’s Customer Assistance Center at at 1-877-
794-8675 (U.S.A. only).
TONER EMPTY The toner cartridge must be replaced. Printing is not
possible until the toner cartridge is replaced.
TONER NEAR EMPTY The toner cartridge is almost out of toner
(approximately 100 pages can be printed).
TOTAL PAGE(S) 01 Number of fax pages transmitted or received.
Continuous tone 3 seconds Indicates the end of transmission,
reception, or copying.
Intermittent tone
(3 beeps)
5 seconds
(1 second on, 1
second off)
Indicates incomplete transmission,
reception, or copying.
Rapid intermittent
tone
35 seconds
(0.7 seconds on,
0.3 seconds off)
Indicates that an extension phone
connected to the machine is off hook.
SYSTEM ERROR [S1] The scanner unit could not detect change point of
home postion. (ON -> OFF or OFF ->ON)

AM-900U
1 – 13
12. Quick setup guide
Connect the phone line cord
to the TEL. LINE jack and a
wall jack.
1
7
IMPORTANT!!
Should you require
any assistance
setting up or
operating your
product, please
DO NOT RETURN
YOUR PRODUCT
TO THE STORE.
After referring to the setup
guide and operation
manual, if you still require
assistance please consult
our web page at http://
www.sharpusa.com. From
our web page you will be
able to directly e-mail our
customer support team.
If you would like personal
assistance, please call our
Customer Assistance
Center at 1-877-794-8675
(U.S.A. only).
Attach the trays.
3
Load paper.
Make sure you have the following
items. If any are missing, contact
your dealer or retailer.
1. Remove the output tray.
45
6
Install the toner cartridge and drum cartridge.
2. Remove the drum cartridge from its
packaging, and remove the tape from
the top of the cartridge.
4. Remove the toner cartridge from its
packaging. Shake the cartridge side
to side four or five times to distribute
the toner evenly within the
cartridge.
3. Insert the drum cartridge,
sliding it along the guides.
5. Insert the toner cartridge, sliding it along
the guides
until it clicks into place .
7. Press to select “YES” and
then press . (This resets
the toner cartridge counter.)
8. Reset the drum cartridge counter:
a.Press once and then or
until “LIFE” appears in the
display.
b. Press and then .
c. Press repeatedly to exit.
MENU Z
A
6. Close the front cover and
thenthesidecover .
Display:
1=YES, 2=NO
TONER EXCHANGED?
2. Insert a stack of paper
into the tray, print side up.
1. Press . Open the side cover
and then the front cover .
Important:
Pull the scanner release toward
you to release the scanner lock.
Plug the power cord into a 120 V,
grounded AC (3-prong) outlet.
Caution: Be sure to release the
scanner lock (Step 3) before
plugging in the power cord.
2
1
2
3
Caution!
Do not touch the fusing unit
under the side cover after the
machine has been in operation,
as it may become very hot.
Grasp this handle to
push the cartridge in
Press on the arrow
mark to make sure
the cartridge clicks
into place
2
1
Toner
cartridge
Telephone
line cord
Drum
cartridge
CD-ROM
Setup
Guide
Document
feeder tray
Output tray
When the tray
stops, lift the end
slightly and push in.
If you will be
loading legal
paper, pull the
extension out.
3. Squeeze the sides of the paper
guide and slide it to the slot for
the length of paper loaded.
4. Replace the output tray.
Note: An extension phone can be
connected to the TEL. SET jack with
removing the seal covering the jack.
TEL.
LINE
TEL.
SET
For detailed instructions
on setting up and using the AM-900,
see the online guide on the
CD-ROM.
To open the guide, double-click the
Manual folder on the CD-ROM,
double-click EnglishA, and then
double-click Online Manual.pdf.
(Note: Acrobat Reader 5.05 or higher
is required to view the manual.To
install Version 5.05, double-click
Acrobat Reader, English, and then
ar505eng.exe on the CD-ROM.)
If you loaded legal paper, see the online guide
to change the paper size setting to LEGAL.
Set the date and time that appear
in the fax mode display.
1. Press , , , .
•The currently set date and time appear
in the display.
2. Enter a 2-digit number for the month.
Example: February
•To clear a mistake press .
3. Enter a two-digit number for the day
("01" to "31").
Example: the 5th
4. Enter the year (four digits)
Example:
FAX MENU
Z
8
5. Enter a two-digit number for the hour
and a two-digit number for the minute.
Example: 9:25
6. Press to select A.M. or to
select P.M.
7. Press .
8. Press repeatedly to exit.
ENTER
The stack should
not be higher
than this line
1
23
1
2

AM-900U
1 – 14
Install the software on your computer. (The software
allows the machine to be used as a printer and scanner.)
9
1. Make sure that a USB cable is not connected
to the machine and your computer. (The cable
will be connected in Step 10.)
•If a cable is connected and a Plug and Play
window appears, close the window and
disconnect the cable.
2. Insert the Sharp CD-ROM into your computer’s
CD-ROM drive.
3. Windows XP : Click the start button, click My
Computer, and double-click the CD-ROM icon.
Windows 98SE/Me/2000R: Double click My
Computer on the desktop and double-click the
CD-ROM icon.
4. Double-click the setup icon ( ) in the CD-
ROM window.
5. Follow the on-screen instructions.
•When the Setup Type Selection window
appears, select Standard to install all of the
software components (this should normally be
selected). If you only wish to install certain
components, select Custom and then select the
components that you wish to install.
•In Windows 2000/XP , if a warning message
appears at any time regarding the Windows logo
test or digital signature, be sure to click Continue
Anyway or Yes.
6. When the Finish window appears to indicate that
the selected packages have been installed, click
Close.
7. If the installation was a Standard Finstallation, the
following window will appear. Click OK.
•If you installed the MFP drivers using a Custom
installation and did not install Sharpdesk, the
following window will appear. Click OK and go to
Step 10.
8. The following window will appear. Click Yes to restart
your computer.
9. The Search Setup Wizard will appear. Follow the
on-screen instructions to create an index
database for Sharpdesk.
10. Make sure that the machine’s power cord is not
plugged in, and then connect the USB cable to the
USB port on the machine and on your computer.
11. Plug in the machine’s power cord.
•Windows XP : Follow Steps 12 through 15 to
complete the installation of the software.
•Windows 2000 : This completes the installation
of the software.
Note: If a warning message regarding the
Windows logo test appears (the warning may
appear twice), click Yes each time the window
appears. This will complete the installation of the
software.
•Windows Me /98SE : This completes the
installation of the software.
Completing the installation on Windows XP
12. In Windows XP , the Found New Hardware
Wizard will appear. Make sure that Install the
software automatically (Recommended) is
selected and click Next.
Note for Windows XP SP2 : The first window of
the wizard will ask you if the wizard can connect
to Windows Update. Select No, not this time and
click Next.
•If a warning message appears regarding the
Windows logo test, click Continue Anyway.
13. When the wizard finishes installing the software, click
Finish to close the wizard.
14. After a brief interval, the Found New Hardware
Wizard will appear again. Make sure that Install
the software automatically (Recommended) is
selected and click Next.
•If a warning message appears regarding the
Windows logo test, click Continue Anyway.
15. When the wizard finishes installing the software,
click Finish to close the wizard. This completes
the installation of the software on Windows XP .
Note: A USB 2.0 or 1.1 cable is required to connect the
machine to your computer. Please purchase this separately.
Link each scan menu that you wish to use in
scan mode to a program on your computer.
10
Windows XP /Me
1. Windows XP : Click the start button, Control
Panel, Printers and Other Hardware, and
Scanners and Cameras.
Windows Me : Click the Start button, point to
Settings, select Control Panel, and double-click
Scanners and Cameras.(IfScanners and
Cameras does not appear, click view all
Control Panel options).
2. Right-click the SHARP AM-900 icon and select
Properties.
3. The SHARP AM-900 Properties appear. Click
on the Events tab.
4. Select SC1 (scan menu SC1) from the Select an
event list.
5. In the Actions field, select Start this program
and then select the program that you wish to link
to scan menu SC1 from the list of programs.
•Microsoft Scanner and Camera Wizard is
selected as an example in the window below.
6. Click the Apply button.
7. Repeat Steps 4 through 6 as needed for any of
the other scan menus (SC2 to SC6) that you
wish to use. When finished, click the OK button.
Windows 2000 /98SE
1. Click the Start button, point to Settings, and
select Control Panel.
2. In the Control Panel, double-click Scanners and
Cameras.
3. Select SHARP AM-900 and click Properties.
4. Click the Events tab in the SHARP AM-900
Properties.
5. Select SC1 (scan menu SC1) from the Scanner
events list.
6. In Send to this application, select the program
(only one) that you wish to link to scan menu SC1.
7. Click the Apply button.
8. Repeat Steps 5 through 7 for any of the other
scan menus (SC2 to SC6) that you wish to use.
When finished, click the OK button.
You can scan directly from the machine by selecting scan mode and then one of scan menus
SC1 to SC6 on the operation panel. When this is done, the program linked to the selected scan
menu will automatically start on your computer and the image will be scanned to the program.
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R

AM-900U
2 – 1
FAXAM-900UService ManualService ManualMarketE
CHAPTER 2. ADJUSTMENTS
[1] Adjustments
1. General
Since the following adjustments and settings are provided for this
model, make adjustments and/or setup as necessary.
2. Adjustments of output voltage (FACTORY ONLY)
1. Install the power supply unit in the machine.
2. Set the recording paper and document.
3. When the document is loaded, power is supplied to the output
lines. Confirm that outputs are within the limits below.
2.1. Output voltage settings
CNPUM
CNTCT
CNROLSNS
CNTCVR
CNMM
CNFM
CNBYPE
CNPIN
CNPW
CNLIU
CNLSR
CNPM
CNRTH
CNOUT2
CNOUT1
CNCIS
CNHV
CNSCM CNPN
CNFRT
CNORG
CNHPS
CNSP
CNUSB
CONTROL PWB
(TOP SIDE)
CNPW
114
114
Output Voltage limits
+24VMAIN 23.04V~24.96V
+24VSUB 23.04V~24.96V
Connector CNPW
Pin No. CNPW
1
+24VSUB
2
3
4
5 +24VMAIN
6 +24VMAIN
7DG
8
9
10
DG
11
+5VMAIN
12
+3.3VMAIN
+5VMAIN 4.75V~5.25V
MG
MG
MG
DG
/HEATER ON
13
14
/PWRLY
/ZC
+3.3VMAIN 3.201V~3.399V
Connector
CN6
Pin No.
1
N.C.
2
3
+24VMAIN
+24VS
Connector
CNHT
Pin No.
1
N.C.
2
3
N
L
Connector
CN2
Pin No.
1
2
2
1
CN6
13
12
CN2
CNHT
13
INTERLOCK
SWITCH
THERMAL
FUSE-2
FUSING UNIT
POWER SUPPLY
PWB (TOP SIDE)

AM-900U
2 – 2
3. High voltage power check
3.1. General
Note: Since the parts of this PWB cannot be supplied, change it as a unit.
CAUTION HIGH VOLTAGE AREA MAX. 4000V
CAUTION
DO NOT TOUCH!
(VR51)
CAUTION - HIGH VOLTAGE
The unit's back cover should never be opened by
anyone other than a qualified serviceperson.
There are many high voltage parts inside the unit,
and touching them is dangerous.
CAUTION HIGH VOLTAGE AREA MAX. 4000V
CAUTION - HIGH VOLTAGE
The unit's back cover should never be opened by
anyone other than a qualified serviceperson.
There are many high voltage parts inside the unit,
and touching them is dangerous.
J22
J21
Q52
D60
D58
D1
D8
D2
D3
D4
C6
D5
D7
D9
C5
CN4
R93
J51
J12
J11
J52
C7
R15
Q3 B1
R1
J5 J6
CN3
C1
VR1
D10
CN1
D61 D53
C9
VR51
D62
J1
J3
J2
B51
C65 C31
VR31
C56
D54
D52 J4
J31
J41
R67
J42
J32
D31
Q38
R16
QJ005
QJ071
C32
R41
R42
R81
R103 R80
R79 R78
D41
D42
Q31
Q32
Q33
Q34 Q36
Q37
Q35
R102 R36
R37
R38
R39
R40
R71
R72
R73
R74
R60
R43
R75
R61
R58
R50
R48
R54
R52
R55
C62
C51
Q58
Q57
C61
R51
R53
R56
R98
R94
R59
R65
R44
R8
R3
R3
R7
R10
R11
C4
R13
R14
R9
C2
R66 R14
R17 R63
R2
R4
R3
R19
R101
R6
R5
C53
C54
C66
C55
C52
C8
IC1
R70
R69
R66
R64 R62
R91
R92
R49
R47
R99 R57
R18
R100
Q51
Q1
CN1
R76
R46
R77
R83
R85
R86
R84
R87
R88 R89 R90
R34
R32 R31
R33 R35
D59
D57 D56 D55

AM-900U
2 – 3
3.2. MC Voltage Check Point
1) MC Voltage
CAUTION - HIGH VOLTAGE
The unit's back cover should never be opened by anyone other than
a qualified serviceperson. There are many high voltage parts inside
the unit, and touching them is dangerous.
J22
J21
Q52
D60
D58
D1
D8
D2
D3
D4
C6
D5
D7
D9
C5
CN4
R93
J51
J12
J11
J52
C7
R15
Q3 B1
R1
J5 J6
CN3
C1
VR1
D10
CN1
D61 D53
C9
VR51
D62
J1
J3
J2
B51
C65 C31
VR31
C56
D54
D52 J4
J31
J41
R67
J42
J32
D31
Q38
R16
QJ005
QJ071
GND (-)
MC Voltage Check Point (-)
(There is danger of an electric shock!)
Use Measuring instrument:
Input Resistance : more than 100 MΩ
Maximum Voltage : more than 2 kV
VOLTAGE
MC:-950V±20V(PRINTING)
MC:-850V±20V(CLEANING)
Voltage(v)
300Hz
Time(s)
Type
-570V
-950V
-1330V
Tolerance
± 67V
± 20V
± 67V

AM-900U
2 – 4
3.3. TC Voltage Check Point
1) TC Voltage
CAUTION - HIGH VOLTAGE
The unit's back cover should never be opened by anyone other than
a qualified serviceperson. There are many high voltage parts inside
the unit, and touching them is dangerous.
J22
J21
Q52
D60
D58
D1
D8
D2
D3
D4
C6
D5
D7
D9
C5
CN4
R93
J51
J12
J11
J52
C7
R15
Q3 B1
R1
J5 J6
CN3
C1
VR1
D10
CN1
D61 D53
C9
VR51
D62
J1
J3
J2
B51
C65 C31
VR31
C56
D54
D52 J4
J31
J41
R67
J42
J32
D31
Q38
R16
QJ005
QJ071
GND (-)
TC Voltage Check Point (+)
(There is danger of an electric shock!)
Use High Voltage Tester:
Requirement of Measuring instrument:
Input Resistance : more than 100 MΩ
Maximum Voltage : more than 5 kV
VOLTAGE
TC(+):+3600V±72V(PRINTING)
TC(-):-500V±50V(CLEANING)
Voltage(v)
300Hz
Time(s)
Type
-3980V
-3600V
-3220V
Tolerance
± 72V