Sharp Mx M453n Owners Manual

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TROUBLESHOOTING
Contents
JPEG was selected for 
the file type but the file 
was created as a TIFF 
file.Is the colour mode set to [Mono2]? When [JPEG] is selected for the file type and the image 
is scanned in Mono 2, the file will be created as a TIFF 
file. To create the file as a JPEG file, change the colour 
mode to [Full Colour] and then press the [START] key.
The image is too light 
or too dark.
(When using PC 
Scan.)Is the threshold value suitable? When scanning from the TWAIN driver with [Mono 2 
gradation] selected from the [Colour Mode] of the 
Custom Settings window, check the B/W Threshold 
setting. A large threshold value makes the image darker 
and a small threshold value makes the image brighter. 
To adjust the B/W Threshold automatically, click the 
[Auto Threshold] button on the [Image] tab of the 
Custom Settings window.
Are the brightness and contrast settings 
suitable?When the brightness and contrast settings are not 
suitable (for example, the scanned image is too bright), 
click the [Auto Brightness / Contrast Adjustment] button 
on the [Colour] tab of the Custom Settings window. 
You can also click the [Brightness / Contrast] button to 
set the brightness and contrast while viewing the 
scanned image.
ProblemPoint to checkSolution 
						

							8-34
TROUBLESHOOTING
Contents
PROBLEMS RELATED TO ONE-TOUCH INDIVIDUAL 
KEYS / GROUP KEYS
ProblemPoint to checkSolution
A one-touch individual 
key or group key 
cannot be stored.Has the maximum number of keys been 
stored?Delete one-touch keys and group keys that are not 
being used.
Have functions been disabled by the 
administrator?Some functions may have been disabled in the system 
settings (administrator). Check with your administrator.
A one-touch individual 
key or group key 
cannot be edited or 
deleted.If the key is an individual key, is the key 
included in a group?Remove the key from the group and then edit or delete 
the key. (If the key is included in multiple groups, it must 
be removed from all groups.)
➞
System Settings > Address Control > Address Book
If multiple group keys have been stored, print the Group 
List in Sending Address List in the system settings. 
The list will show where the key is stored.
➞System Settings > List Print (User) > Sending 
Address List > Group List
Is the key being used in a reserved 
transmission or a transmission in 
progress?Wait until the transmission is finished or cancel the 
transmission and then edit or delete the key.
Is the key included in a program key? Remove the key from the program and then edit or 
delete the key. (If the key is included in multiple 
programs, it must be removed from all programs.)
➞System Settings > Address Control > Program
If multiple program keys have been stored, print the 
Program List in Sending Address List in the system 
settings. The list will show where individual and group 
keys are stored.
➞System Settings > List Print (User) > Sending 
Address List > Program List
Have functions been disabled by the 
administrator?Some functions may have been disabled in the system 
settings (administrator). Check with your administrator.
Has your administrator enabled a 
function that prevents editing/deleting?If your administrator has enabled Default Address 
Setting (on the machine) or Inbound Routing Settings 
(in the Web pages), editing/deleting will not be possible. 
Check with your administrator. 
						

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TROUBLESHOOTING
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PROBLEMS RELATED TO FILING
DOCUMENT FILING
PROBLEMS RELATED TO FILING
 Document filing does not take place.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-35
 A filed data can not be printed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-35
 A job cannot be stored in a custom folder. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-36
PROBLEMS RELATED TO FILE MANAGEMENT
 A stored file has disappeared.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-36
 A file cannot be deleted. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-36
 The property of a file cannot be set to [Confidential]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..8-36
 A confidential file or confidential folder cannot be opened.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-36
 A file name cannot be stored or changed.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-36
 A custom folder name cannot be stored or changed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-36
 A file name is cut off.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-36
 If you cannot find the item that you are looking for in the above table of contents, see GENERAL PROBLEMS (page 
8-37).
 If you are unable to solve a problem using the solutions in this manual, switch off the [POWER] key ( ) and the 
main power switch. Wait at least 10 seconds, and then switch on the main power switch and the [POWER] key ( ) 
in that order.
When the LINE indicator is lit or the DATA indicator is lit or blinking, do not switch off the main power switch or unplug 
the power plug. This may damage the hard drive or cause the data being stored or received to be lost.
ProblemPoint to checkSolution
Document filing does 
not take place.Did you select document filing settings 
in the printer driver?In print mode, enable document filing on the [Job 
Handling] tab of the printer driver.
In copy mode or image send mode, touch the [Quick 
File] key or the [File] key and then use the document 
filing function.
Have functions been disabled by the 
administrator?Some functions may have been disabled in the system 
settings (administrator). Check with your administrator.
When user authentication is enabled, the functions that 
you can use may be restricted in your user settings. 
Check with your administrator.
A filed data can not be 
printed.Have functions been disabled by the 
administrator?Some functions may have been disabled in the system 
settings (administrator). Check with your administrator.
When user authentication is enabled, the functions that 
you can use may be restricted in your user settings. 
Check with your administrator. 
						

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TROUBLESHOOTING
Contents
PROBLEMS RELATED TO FILE MANAGEMENT
A job cannot be stored 
in a custom folder.Do custom folders appear in Folder 
Information?
(When printing)Click the [Get Folder Name] button in the document 
filing save screen of the printer driver to call up the 
custom folders that have been created on the machine.
Does the custom folder have a 
password?Enter the password configured in the machine in the 
document filing save screen.
ProblemPoint to checkSolution
A stored file has 
disappeared.Did you touch the [Print and Delete the 
Data] key to print a stored file?A file that is printed using the [Print and Delete the Data] 
key is automatically deleted after being printed. To print 
a file without deleting it, use the [Print and Save the 
Data] key.
The file property can be set to Protect to prevent the 
file from being easily deleted.
Has automatic deletion of document 
filing files been enabled?When Automatic Deletion of File Settings is enabled in 
the system settings (administrator), the files in the 
specified folders are periodically deleted. (Even when 
the file property is Confidential or Protect, the file 
may be deleted.) If files that you need have been 
deleted, consult the administrator of the machine.
A file cannot be 
deleted.Is the property of the file set to 
[Protect]?A file cannot be deleted when its property is set to 
[Protect]. Change the property to [Sharing] and then 
delete the file.
The property of a file 
cannot be set to 
[Confidential].Is the file in the Quick File folder? Confidential cannot be specified for a file in the Quick 
File folder. Move the file to a different folder and then 
specify Confidential. (Note that Protect can be 
specified for a file in the Quick File folder to prevent it 
from being easily deleted.)
A confidential file or 
confidential folder 
cannot be opened.Did you enter the wrong password? If you cannot remember the password, it is possible to 
change the file or folder password to a new password in 
the system settings (administrator). Ask your 
administrator.
A file name cannot be 
stored or changed.Does the name include characters that 
cannot be used in a file or folder name?The following characters cannot be used in a file or 
folder name:
 ? /  ; : , < > ! * & # |
A custom folder name 
cannot be stored or 
changed.
A file name is cut off.Was the file name stored in the 
advanced transmission settings during a 
scan or Internet fax transmission?If the name was stored in the advanced transmission 
settings before Quick File or File settings were 
configured, that name will be used for the stored file. If 
the number of characters in the name exceeds the 
maximum number of characters allowed for a Quick File 
name (30 characters), the characters after the 30th 
character will be discarded.
ProblemPoint to checkSolution 
						

							8-37
TROUBLESHOOTING
Contents
GENERAL PROBLEMS
PROBLEMS RELATED TO MACHINE OPERATION
 Specified machine functions cannot be used.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..8-38
 The operation panel cannot be used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-38
 Printing is not possible or stops during a job. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-39
 The original size is not automatically selected or the wrong size is selected.  . . . . . . . . . . . . . . . . . .8-39
 The displayed bypass tray paper size is not correct.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-39
PROBLEMS RELATED TO PAPER FEEDING AND OUTPUT
 The original misfeeds (automatic document feeder).  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-40
 The paper misfeeds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-40
 Paper does not feed from the paper tray. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-41
 The image on paper is skewed.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-41
 The automatic document feeder does not operate.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-41
PROBLEMS RELATED TO QUALITY / PRINT RESULTS
 Lines appear in the scanned image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-41
 Smudges appear on printed output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-42
 Toner does not adhere well or creases appear in the paper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-42
 Print quality is poor.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-42
 Part of the image is cut off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-42
 Printing takes place on the wrong side of the paper.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-43
 A cover or insert is not printed on the specified paper. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-43
PROBLEMS RELATED TO PERIPHERAL DEVICES
 The connected USB device cannot be used.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-43
 The connected USB memory cannot be used. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-43
 The finisher / saddle stitch finisher does not operate.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..8-43
 Stapling does not take place (including pamphlet stapling). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-43
 Punching does not take place.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-44
 The stapling position or punch position is not correct.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-45
 Folding does not take place. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-45
OTHER PROBLEMS
 Preview images or thumbnail images do not appear. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-45
 The touch panel screen is difficult to view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-45
 You were logged out without having performed logout yourself.  . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-45
 You forgot the administrator password.  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-45
If you are unable to solve a problem using the solutions in this manual, switch off the [POWER] key ( ) and the main 
power switch. Wait at least 10 seconds, and then switch on the main power switch and the [POWER] key ( ) in that 
order.
When the LINE indicator is lit or the DATA indicator is lit or blinking, do not switch off the main power switch or unplug 
the power plug. This may damage the hard drive or cause the data being stored or received to be lost. 
						

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TROUBLESHOOTING
Contents
PROBLEMS RELATED TO MACHINE OPERATION
ProblemPoint to checkSolution
Specified machine 
functions cannot be 
used.Have functions been disabled by the 
administrator?Some functions may have been disabled in the system 
settings (administrator). Check with your administrator.
When user authentication is enabled, the functions that 
you can use and page counts may be restricted in your 
user settings. Check with your administrator.
The operation panel 
cannot be used.Is the main power indicator lit? If the main power indicator is not lit, make sure that the 
power plug is firmly inserted in the power outlet, switch 
the main power switch to the on position, and press 
the [POWER] key ( ) to turn on the power.
Did you just power on the machine? After the [POWER] key ( ) is turned on, the machine 
requires some time to complete warmup operation.
During this time functions can be selected, however, a 
job cannot be run. Wait until a message appears 
indicating that the machine is ready.
Is the [POWER SAVE] key ( ) 
blinking?Auto Power Shut-Off mode has activated. To return the 
machine to normal operation, press the [POWER SAVE] 
key ( ).
☞1. BEFORE USING THE MACHINE [POWER 
SAVE] KEY (page 1-16)
Is a cover open or a device separated 
from the machine?A warning message will appear when a cover is open or 
a device is separated from the machine. Read the 
message and take appropriate action.
Did login fail three times in a row? When A Warning when Login Fails is enabled in the 
system settings (administrator) and login fails 3 times in 
a row, a warning will be displayed and operation will 
lock for 5 minutes. After operation unlocks, log in using 
the correct user information. (If you do not know your 
user information, contact your administrator.)
Does a message appear indicating that 
Auto Login failed?Auto Login failed due to a problem on the network. 
Contact your administrator.
If you are the administrator, touch the [Admin Password] 
key, log in as an administrator, and temporarily change 
the auto login settings in the system settings 
(administrator). (Restore the changed settings to their 
original state after the network problem has been 
solved.) 
						

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TROUBLESHOOTING
Contents
The operation panel 
cannot be used.Does the message Call for service. 
Code:xx-xx*. appear in the touch 
panel?
*Letters and numbers appear in xx-xx.Make sure that the LINE indicator is not lit and that the 
DATA indicator is not blinking or lit and then switch off 
the [POWER] key ( ) and the main power switch. 
Wait at least 10 seconds and then switch the main 
power switch and the [POWER] key ( ) back on in 
that order.
If the message still appears after switching the 
[POWER] key ( ) and main power switch off and on 
several times, it is likely that a failure has occurred that 
requires service. In this event, stop using the machine, 
unplug the power plug, and contact your dealer or 
nearest authorised service representative. (When 
contacting your dealer or nearest authorised service 
representative, inform them of the displayed error code.)
Printing is not 
possible or stops 
during a job.Is a tray out of paper?Add paper as instructed by the message in the touch panel.
Is the machine out of toner? When toner runs low, a message will appear to inform 
you that the toner cartridge must be replaced. To 
replace the toner cartridge, see MAINTENANCE 
(page 1-60) in 1. BEFORE USING THE MACHINE.
Has a paper misfeed occurred? Remove the misfeed as instructed by the message in 
the touch panel.
☞REMOVING MISFEEDS (page 8-2)
Is the output tray full? When the output tray becomes full, a detector activates 
and stops printing.
Remove the output from the tray and resume printing.
Is the toner collection container full? Replace the toner collection container as instructed by 
the message in the touch panel.
☞1. BEFORE USING THE MACHINE 
MAINTENANCE (page 1-60)
In the Paper Tray Settings of the system 
settings, are restrictions placed on the 
trays that can be used in each mode 
(copy, print, fax, Internet fax, and 
document filing)?Check the Paper Tray Settings and see if checkmarks 
appear in the checkboxes of each mode (Feeding 
Approved Job). Functions without a checkmark cannot 
be used for printing using that tray.
➞System Settings > Paper Tray Settings > Tray 
Settings > Change >   (Each mode)
The original size is not 
automatically selected 
or the wrong size is 
selected.Is the original curled or folded? The correct original size cannot be detected if the 
original is curled or folded. Straighten the original.
Did you place an original smaller than 
A5 (5-1/2 x 8-1/2) size?Original sizes smaller than A5 (5-1/2 x 8-1/2) cannot 
be detected. Enter the original size manually.
When scanning a small original on the document glass, 
it is convenient to place a blank sheet of paper on top of 
the original which is the same size (A4 (8-1/2 x 11), B5 
(8-1/2 x 11R), etc.) as the paper that you wish to use 
for printing.
The displayed bypass 
tray paper size is not 
correct.Is the bypass tray extension pulled out? When loading paper in the bypass tray, be sure to pull 
out the extension to enable the paper size to be 
detected correctly.
ProblemPoint to checkSolution 
						

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TROUBLESHOOTING
Contents
PROBLEMS RELATED TO PAPER FEEDING AND 
OUTPUT
ProblemPoint to checkSolution
 The original misfeeds 
(automatic document 
feeder).Is too much paper loaded in document 
feeder tray?Make sure that the stack of paper in the tray is not 
higher than the indicator line.
Is the original a long original? When using the automatic document feeder to scan a 
long original, set the scan size to [Long Size]. (Note that 
long originals cannot be copied using the copy function.)
Is the original on thin paper? Use the document glass to scan the original. If you need 
to use the automatic document feeder, use slow scan 
mode in the special modes to scan the original.
Is the feed roller dirty? Clean the surface of the original feed roller.
☞1. BEFORE USING THE MACHINE 
MAINTENANCE (page 1-60)
The paper misfeeds.Is a torn piece of paper remaining in the 
machine?Make sure all paper is removed.
☞REMOVING MISFEEDS (page 8-2)
Is too much paper loaded in the tray? Make sure that the stack of paper in the tray is not 
higher than the indicator line.
Are multiple sheets feeding at once?Fan the paper well before loading it.
Are you using paper that is not within 
the specifications?Use SHARP-recommended paper. Using paper that is 
not supported may result in misfeeds, creases, or 
smudges.
☞SUPPLIES in the Safety Guide
For paper that is prohibited or not recommended, see 
USEABLE PAPER (page 1-28) in 1. BEFORE USING 
THE MACHINE.
Has the paper in the tray absorbed 
moisture?If you will not be using paper in a tray for a long time, 
remove the paper from the tray and store it in a bag in a 
dark and dry location.
Are the bypass tray guides adjusted to 
the width of the paper?Adjust the bypass tray guides to the width of the paper.
Is the bypass tray extension pulled out? When loading a large size of paper, pull out the 
extension.
Is the bypass feed roller dirty? Clean the surface of the bypass feed roller.
☞1. BEFORE USING THE MACHINE 
MAINTENANCE (page 1-60) 
						

							8-41
TROUBLESHOOTING
Contents
PROBLEMS RELATED TO QUALITY / PRINT RESULTS
The paper misfeeds.Is A5 (5-1/2 x 8-1/2) size paper 
loaded?Load A5 (5-1/2 x 8-1/2) size paper in tray 1 (the first 
tray), in tray 2 (the second tray), or in the bypass tray.
When loading A5 (5-1/2 x 8-1/2) size paper, place the 
paper in the horizontal (A5R (5-1/2 x 8-1/2R)) 
orientation.
Has the correct paper size been set? If you are using a special size, be sure to specify the 
paper size.
If the size of paper loaded in a tray was changed, be 
sure to check the paper size setting.
➞System Settings > Paper Tray Settings > Tray 
Settings
Did you add paper to the bypass tray? When adding paper, remove any paper remaining in the 
bypass tray, combine it with the paper to be added, and 
reload as a single stack. If paper is added without 
removing the remaining paper, a misfeed may result.
Paper does not feed 
from the paper tray. Is the paper loaded correctly in the 
paper tray?Set the guides to the size of the paper. Make sure the 
height of the paper does not exceed the indicator line.
In the Paper Tray Settings of the system 
settings, are restrictions placed on the 
trays that can be used in each mode 
(copy, print, fax, Internet fax, and 
document filing)?Check the Paper Tray Settings and see if checkmarks 
appear in the checkboxes of each mode (Feeding 
Approved Job). Functions without a checkmark cannot 
be used for printing using that tray.
➞System Settings > Paper Tray Settings > Tray 
Settings > Change >   (Each mode)
The image on paper is 
skewed.Is too much paper loaded in the bypass 
tray?Do not load more than the maximum number of sheets.
The maximum number of sheets varies depending on 
the paper type setting. For more information, see 
SPECIFICATIONS in the Safety Guide.
Are the bypass tray guides adjusted to 
the width of the paper?Adjust the bypass tray guides to the width of the paper.
Are the original guides adjusted to the 
width of the paper?Adjust the original guides to the width of the paper.
The automatic 
document feeder does 
not operate.Have functions been disabled by the 
administrator?Some functions may have been disabled in the system 
settings (administrator). Check with your administrator.
ProblemPoint to checkSolution
Lines appear in the 
scanned image.Are the scanning areas of the document 
glass or automatic document feeder 
dirty?Clean the scanning areas of the document glass or 
automatic document feeder.
☞1. BEFORE USING THE MACHINE 
MAINTENANCE (page 1-60)
Is the bypass feed roller dirty? Clean the surface of the bypass feed roller.
☞1. BEFORE USING THE MACHINE 
MAINTENANCE (page 1-60)
ProblemPoint to checkSolution 
						

							8-42
TROUBLESHOOTING
Contents
Smudges appear on 
printed output.Are you using paper that is not within 
the specifications?Use SHARP-recommended paper. Using paper that is 
for other models or special paper that is not supported 
may result in misfeeds, creases, or smudges.
☞SUPPLIES in the Safety Guide
Are you printing on pre-punched paper? If the printed image overlaps the punch holes, smudges 
may appear on the reverse side of the paper following 
one-sided printing, or on both sides following two-sided 
printing. Take care that the image does not overlap the 
punch holes.
Does a message appear indicating the 
need for maintenance?Contact your dealer or nearest authorised service 
representative as soon as possible.
Toner does not adhere 
well or creases appear 
in the paper.Are you using paper that is not within 
the specifications?Use SHARP-recommended paper. Using paper that is 
for other models or special paper that is not supported 
may result in misfeeds, creases, or smudges.
☞SUPPLIES in the Safety Guide
Did you set the correct paper type? Set the correct paper type in the tray settings. Make 
sure that the following has not occurred:
 Heavy paper is being used, but a paper type other 
than heavy paper is selected in the tray settings. (The 
image may disappear if rubbed.)
 Paper other than heavy paper is being used, but 
heavy paper is selected in the tray settings. (This may 
cause creases and misfeeds.)
➞System Settings > Paper Tray Settings > Tray 
Settings
Is the paper loaded so that printing 
takes place on the reverse side?If printing takes place on the wrong side of label sheets 
or transparency film, the toner may not adhere well and 
a clear image may not be obtained.
Is a suitable paper weight set? Setting a suitable paper weight in the system settings 
(administrator) may improve toner adherence. 
➞System Settings (administrator) > Device Control > 
Fusing Control Settings
Print quality is poor.Is Toner Save Mode enabled? When Toner Save Mode is enabled, printing takes 
place using less toner and thus the print result is lighter. 
Check with your administrator.
Part of the image is 
cut off.Has the correct paper size been set? If you are using a special size, be sure to specify the 
paper size.
If the size of paper loaded in a tray was changed, be 
sure to check the paper size setting.
➞System Settings > Paper Tray Settings > Tray 
Settings
Was the original placed in the correct 
position?If you are using the document glass, be sure to place 
the original in the far left corner of the document glass.
☞1. BEFORE USING THE MACHINE PLACING 
THE ORIGINAL ON THE DOCUMENT GLASS 
(page 1-40)
ProblemPoint to checkSolution