Oki Printer ML3320 User Manual

ML 3320/3321  
SEL  
SEL  
MENU  
LF  
Micro Feed  
Down  
SHIFT  
FF/LOAD  
EXIT  
POWER  
Micro Feed  
Up  
TEAR  
PRINT QUALITY  
GROUP  
ALARM  
P
ARK  
ITEM  
MENU  
QUIET  
TOF  
HSD  
NLQ  
SET  
UTL  
PRINT  
SSD  
CHARACTER PITCH  
10  
17  
12  
20  
15  
PROP  
Help Guide  
 
Safety  
Your Oki printer has been carefully designed to give you years of  
safe, reliable performance. As with all electrical equipment, there  
are a few basic precautions you should take to avoid hurting  
yourself or damaging the printer:  
Do not use your printer near water, or spill liquid of any kind  
into it.  
Be certain that your power source matches the rating listed  
on the back of the printer. If you are not sure, check with your  
dealer or with your local power company.  
Read the setup and operating instructions in this manual  
carefully. Be sure to save it for future reference.  
Your printer has an earthed, 3-pin plug as a safety feature,  
and it will only fit into an earthed outlet. If you can not plug  
it in, chances are that you have an older, non-earthed outlet;  
contact an electrician to have it replaced with an earthed outlet.  
Do not use an adapter to defeat the earthing.  
Read and follow all warning and instruction labels on the  
printer itself.  
Unplug the printer before you clean it. Use only a damp cloth;  
do not use liquid or aerosol cleaners.  
The outlet into which you plug your printer must remain easily  
accessible at all times.  
Place your printer on a firm, solid surface. If you put in on  
something unsteady, it might fall and be damaged; if you place  
it on a soft surface, such as a rug, sofa, or bed, the vents may  
be blocked, causing it to overheat.  
To avoid damaging the power cable, do not put anything on it  
or place it where it will be walked on. If the cable becomes  
damaged or frayed, replace it immediately.  
To protect your printer from overheating, make sure no  
openings on the printer are blocked. Do not put the printer on  
or near a heat source, such as a radiator or heat register. If you  
put the printer in any kind of enclosure, make sure it is well  
ventilated.  
If you are using an extension cable or power strip with the  
printer, make sure that the total of the amperes required by all  
the equipment on the extension is less than the extension’s  
rating. Generally, the total ratings of all equipment plugged  
into any one power line should not exceed 15 amperes. Don’t  
exceed this unless you know that the power line your  
equipment is plugged into has a rating above 15 amperes.  
The printhead can get quite hot when it has been printing for  
a length of time. Do not touch the printhead until it has had a  
chance to cool off.  
Help Guide  
i
 
Do not poke anything into the ventilation slots on the sides  
of the printer; you could get a shock or cause a fire.  
Aside from the routine maintenance described in this  
handbook, do not try to service the printer yourself; opening  
the cover may expose you to shocks or other hazards. Do not  
make any adjustments other than those outlined in the  
handbook, you might cause damage requiring extensive repair  
work.  
If anything happens that indicates that your printer is not  
working properly or has been damaged, unplug it immediately  
and contact your dealer. These are some of the things to look  
for:  
The power cable or plug is frayed or damaged.  
Liquid has been spilled into the housing, or the printer  
has been exposed to water.  
The printer has been dropped or its cabinet has been  
damaged.  
The printer does not function normally when you are  
following the operating instructions.  
ii  
ML3320/21  
 
Contents  
Safety .................................................................................. i  
Menu Mode: Control Panel ............................................. 14  
Maintenance....................................................................... 1 Entering and Exiting the Menu Mode ............................. 15  
Replacing the Ribbon Cartridge ........................................ 1 Resetting the Menu .......................................................... 15  
Clearing Paper Jams .......................................................... 2  
Printing the Menu Settings .............................................. 15  
Rear-Feed Jams ................................................................. 2 Changing the Menu Settings ........................................... 15  
Correcting Repetitive Rear-Feed Jams .............................. 4 Summary of Menu Settings ............................................. 16  
Single-Sheet Jams.............................................................. 6  
Explanations of Menu Items............................................ 19  
Cleaning the Housing ........................................................ 7 Using the Printer's Features ............................................. 21  
Troubleshooting ................................................................. 8 Tear Feature ..................................................................... 21  
Using Your Printer ........................................................... 11  
Forms Tear-Off Feature ................................................... 21  
Print Mode: Indicator Lights ........................................... 11 Paper Park Feature ........................................................... 22  
Print Mode: Control Panel Keys...................................... 12 Specifications................................................................... 23  
Selecting the Print Quality .............................................. 13  
Selecting the Character Pitch .......................................... 14  
Index ................................................................................ 26  
Help Guide  
iii  
 
iv  
ML3320/21  
 
Maintenance  
Replacing the Ribbon Cartridge  
3. Remove and discard the used ribbon cartridge.  
Note: For the best results, use genuine Oki ribbons.  
1. Make sure the printer is turned OFF.  
2. Centre the printhead ().  
Caution! The printhead may be HOT!  
M
4. Unpack the new ribbon cartridge.  
Help Guide  
1
 
5. Install the new ribbon cartridge.  
Clearing Paper Jams  
Rear-Feed Jams  
1. Turn the printer OFF and use the platen knob to back the  
paper all the way out.  
A
6. Turn the knob () in the direction of the arrow to take up  
any ribbon slack.  
2. Open the access cover, and remove the pull-up roller  
assembly.  
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ML3320/21  
 
3. Remove any torn pieces of paper.  
6. Turn the printer on.  
4. Replace the pull-up roller assembly, and close the access  
cover.  
7. Press FF/LOAD.  
5. Reload paper.  
FF/LOAD  
Micro Feed  
Up  
ITEM  
Help Guide  
3
 
Correcting Repetitive Rear-Feed Jams  
If the paper keeps jamming, you probably have bits of paper  
stuck in the paper path.  
3. Fold some continuous-form paper over three times to  
make a page four sheets thick, load it on the tractors and  
close the covers.  
1. Perform steps 1 through 3 under “Rear-Feed Jams.”  
2. Grasp the paper separator (), lift it slightly, pull back  
on it, then swing it forward.  
4. Swing the paper separator over, and use the platen knob  
to draw the quadruple-thick page around the platen: this  
brings out any jammed bits of paper.  
TEAR  
PRINT QUALITY  
PARK  
QUIET  
HSD  
SET  
UTL  
TOF  
NLQ  
PRINT  
CHARACTER PITCH  
SSD  
10  
17  
12  
20  
15  
PROP  
4
ML3320/21  
 
5. Remove the paper pieces, and use the platen knob to 7. Replace the pull-up roller assembly, and close the access  
back the paper out.  
cover.  
FF/LOAD  
Micro Feed  
Up  
TEAR  
PRINT QUALITY  
PARK  
TEM  
QUIET  
TOF  
HSD  
NLQ  
SET  
UTL  
MENU  
PRINT  
CHARACTER PITCH  
SSD  
10  
17  
12  
20  
15  
PROP  
8. Turn the printer on.  
6. Swing the paper separator over, reload regular paper, and  
lower the paper separator back into place.  
9. Press FF/LOAD.  
FF/LOAD  
Micro Feed  
Up  
ITEM  
Help Guide  
5
 
4. Remove any torn pieces from around the carriage.  
Single-Sheet Jams  
5. Reinstall the pull-up roller assembly, and close the access  
cover.  
1. Turn the printer off.  
2. Use the platen knob to back the jammed paper out.  
SEL  
SEL  
MENU  
LF  
Micro Feed  
Down  
SHIFT  
EXIT  
POWER  
FF/LOAD  
Micro Feed  
Up  
TEAR  
PRINT QUALITY  
ALARM  
GROUP  
PARK  
ITEM  
MENU  
QUIET  
TOF  
HSD  
NLQ  
SET  
UTL  
PRINT  
CHARACTER PITCH  
SSD  
10  
17  
12  
20  
15  
PROP  
6. Turn the printer on, and reload paper.  
3. Open the access cover and remove the pull-up roller  
assembly.  
SEL  
SEL  
MENU  
LF  
Micro Feed  
Down  
SHIFT  
EXIT  
POWER  
FF/LOAD  
Micro Feed  
Up  
TEAR  
PRINT QUALITY  
ALARM  
GROUP  
PARK  
ITEM  
MENU  
QUIET  
TOF  
HSD  
NLQ  
SET  
UTL  
PRINT  
CHARACTER PITCH  
SSD  
10  
17  
12  
20  
15  
PROP  
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ML3320/21  
 
Cleaning the Housing  
You should clean the printer every six months (or after about  
300 hours of operation).  
4. Reinstall the pull-up roller assembly, and close the access  
cover.  
Note: Never use solvents or strong detergents on the cabi-  
net: they could damage the housing.  
1. Turn the printer off, and remove any paper from the path.  
2. Open the access cover, remove the pull-up roller  
assembly.  
3. Use a clean, dry cloth to dust around the carriage shaft  
and platen. Remove any loose bits of paper.  
Help Guide  
7
 
Problem: I'm getting strange symbols, incorrect fonts, etc.,  
Troubleshooting  
when I try to print a document.  
Problem: Nothing happens when I turn on the printer.  
Solution: (1) Check to be sure that the printer driver you  
have selected in your software matches the  
printer emulation. (Press SHIFT and SEL  
keys, then press GROUP key: this will print a  
line showing the emulation you have selected.)  
Solution: Check the power cable connection and power  
outlet to your printer. If you are using a power  
strip, make sure it is turned on, and that the fuse  
has not blown nor the circuit breaker tripped.  
(2) If you have embedded any printer commands  
in your software, check to be sure that you  
entered them correctly.  
Problem: The printer does not print when data is sent.  
Solutions:(1) Is the SEL light on? If not, press the SEL key.  
(2) Check that the interface cable is securely  
connected to both the printer and the computer.  
Problem: I've installed a new ribbon and the printing is  
smeared and streaked.  
(3) If you have the optional serial interface board  
installed, check to be sure that it is firmly  
seated in the printer.  
Solution: The ribbon shield is either loose or missing.  
Remove the ribbon cartridge and check the clear  
plastic ribbon shield: if it's loose, secure it in place,  
if it is missing, find it and reinstall it.  
8
ML3320/21  
 
Problem: The ALARM light is on and the Character Pitch Problem: My word processor files don’t print the way I  
15 light is flashing. have the menu and front panel set.  
Solution: This indicates a paper jam. Press the SEL key and Solution: Before sending a file to the printer, many word  
correct the paper jam situation ( see “Clearing  
Paper Jams” earlier in this manual).  
processors send either an “initialisation string” or  
an I-Prime signal to the printer. The initialisation  
string contains codes that override the panel and  
menu settings.  
Problem: The ALARM light is on and the Character Pitch  
10 light is flashing.  
To change your printer to ignore the reset code,  
enter the Menu Mode, go down to the Set-Up  
group and change the setting for Reset Inhibit to  
Yes (see Menu Mode later in this manual).  
Solution: This indicates that the paper lever is set at the  
wrong position for the paper you are trying to use:  
move it to the proper setting.  
The I-Prime signal will automatically override any  
front panel settings you have made. To eliminate  
this problem, enter the Menu Mode, go down to  
the Parallel Interface group and change the setting  
for I-Prime to Invalid (see Menu Mode later in  
this manual).  
Problem: The ALARM light is blinking.  
Solution: Try turning the printer off and then back on again.  
If the light still blinks, call for service.  
Problem: The printer needs paper, but the ALARM light  
is not on and I can’t load the paper.  
Solution: Press and release the SEL key, then hold the  
SHIFT key and press the RESET (CHARACTER  
PITCH) key: this resets the printer.  
Help Guide  
9
 
Problem: The Print Quality and Character Pitch keys on  
the front panel won’t work.  
Solution: The Operator Panel Function in the printer menu  
can be used to disable these buttons. If the printer  
is part of a customised system or if it is used by a  
number of people, the system manager may have  
used this option to make sure the printer is always  
set properly.  
Problem: Continuous-form paper is sticking to the paper  
separator.  
Solution: In cold dry weather, static charges can build up  
and make the paper cling to the paper separator.  
Try moving the paper guides together so that the  
paper rests on the guides rather than on the  
separator.  
Problem: Ink smears on paper.  
Solution: This may be caused by excessive printhead travel  
from the centring position when printing narrow  
columns. Set Centring Position to MODE 1. On  
ML3321 also try MODE 2. (See Menu Mode).  
10  
ML3320/21  
 
UsingYour Printer  
Print Mode: Indicator Lights  
PRINT QUALITY  
HSD  
UTL  
SSD  
SEL  
SEL  
NLQ  
FF/LOAD  
TEAR  
SET  
PARK  
QUIET  
TOF  
LF  
Micro Feed  
Down  
Micro Feed  
Up  
SHIFT  
MENU  
CHARACTER PITCH  
10  
12  
20  
15  
PRINT  
ITEM  
EXIT  
POWER  
GROUP  
17  
PROP  
ALARM  
MENU  
SEL .............. Glows = printer selected, ready to receive data  
Flashes = printer in Print Suppress Mode  
ALARM ...................... Glows = error condition exists:  
out of paper if no other lights are blinking  
paper jam if 15 cpi light is also blinking  
Not lit = printer deselected (can’t receive data)  
paper lever is set to wrong position if 10 cpi  
QUIET ......... Glows = printer in Quiet state.  
POWER ....... Glows = printer turned on.  
light is also blinking.  
Blinks = error condition. Turn printer off, then on;  
if the light still flashes, contact your service dealer.  
PRINT QUALITY ..... Indicates print quality selected.  
10/12/15/17/20/PROP ..... Indicate character pitch selected.  
Help Guide  
11  
 
Print Mode: Control Panel Keys  
PRINT QUALITY  
HSD  
UTL  
SEL  
SEL  
NLQ  
SSD  
FF/LOAD  
TEAR  
SET  
PARK  
QUIET  
TOF  
LF  
Micro Feed  
Down  
Micro Feed  
Up  
SHIFT  
MENU  
CHARACTER PITCH  
10  
12  
20  
15  
PRINT  
ITEM  
EXIT  
POWER  
GROUP  
17  
PROP  
ALARM  
MENU  
SEL ......... Selects/deselects printer. When held on power up, PRINT QUALITY ........... Selects the print quality.  
engages the Menu Mode.  
FF/LOAD ......................... Loads/ejects single sheet of paper;  
SHIFT ..... Press and hold while pressing another switch to en-  
gage the alternate function for that switch (e.g.  
“Micro Feed Down” for the LF key).  
moves continuous-form paper to  
print position.  
TEAR ................................ Moves continuous-form paper up  
LF............ Moves paper up one line: press and hold for repeti-  
tive line feeds. When held on power up, activates  
the Font Test  
for tear-off or back down for print-  
ing.  
PARK ................................ Retracts continuous-form paper  
QUIET .... Turns Quiet Mode on and off. When held on power  
from the path  
up, activates the Rolling ASCII Test.  
CHARACTER PITCH .... Selects the character pitch. Used  
with the SHIFT key to reset the  
printer.  
12  
ML3320/21  
 
Selecting the Print Quality  
Important! Front panel settings for print quality and SSD: Super Speed Draft  
character pitch can be overridden by software  
commands. The lights will always reflect the  
printer’s state.  
Lowest quality (12 cpi only), fastest speed  
Gothic font only  
Recommended for fastest output of preliminary drafts.  
In order to use Super Speed Draft (SSD), you must enter  
the Menu Mode and make changes:  
Press PRINT QUALITY to select:  
NLQ: Near Letter Quality  
1. Press SHIFT + SEL.  
2. Press GROUP twice.  
3. Press ITEM.  
4. Press SET until DRAFT appears as the setting for the  
Highest quality, slowest speed  
Courier or Gothic fonts  
Recommended for correspondence  
Print Mode.  
5. Press ITEM.  
6. Press SET (SSD appears as the setting for the Draft  
Mode).  
7. Press SHIFT + SEL key to exit the Menu Mode and  
save your changes.  
UTL: Utility  
Medium quality, medium speed  
Gothic font only  
Recommended for internal documents and high-volume  
data.  
HSD: High Speed Draft  
Lower quality, faster speed  
Gothic font only  
Recommended for preliminary drafts.  
Help Guide  
13  
 
Selecting the Character Pitch  
Menu Mode: Control Panel  
Press CHARACTER PITCH to select the width of  
characters in characters per inch:  
SEL  
10 cpi  
FF/LOAD  
TEAR  
SET  
PARK  
QUIET  
TOF  
LF  
SEL  
Micro Feed  
Down  
Micro Feed  
Up  
SHIFT  
MENU  
Recommended for standard text  
Not available for SSD  
PRINT  
ITEM  
EXIT  
POWER  
GROUP  
ALARM  
MENU  
12 cpi  
Recommended for standard text.  
Yields more text per page.  
GROUP key ... Prints the next Group in the Menu. With the  
SHIFT key, prints the previous Group.  
17.1 cpi, 20 cpi  
Smallest print  
Recommended for spreadsheets  
Not available for SSD.  
ITEM key ....... Prints the next Item in the Group. With the  
SHIFT key, prints the previous Item in the  
Group.  
SET key .......... Prints the next Setting for an Item. With the  
SHIFT key, prints the previous Setting for an  
Item.  
PROP  
Proportional spacing  
Recommended for documents where you want a more  
polished appearance.  
PRINT key ..... Prints a copy of all the Menu settings. With  
the SHIFT key, prints the current settings for  
the Group selected.  
Available only for NLQ.  
MENU light.... Glows when the printer is in the Menu Mode.  
14  
ML3320/21  
 
Entering and Exiting the Menu Mode  
Changing the Menu Settings  
To enter or exit the Menu Mode, hold SHIFT while pressing 1. Press SHIFT + SEL to enter the Menu Mode.  
SEL.  
2. Use the GROUP, ITEM and SET keys to make your  
changes:  
Resetting the Menu  
Press GROUP successively until the Group you  
wish to change appears in the first column.  
To reset the Menu to the standard settings:  
1. Turn the printer off.  
Press ITEM until the Item you wish to change  
appears in the second column.  
2. Press SEL + LF while turning the printer on.  
Press SET until the setting you want appears in the  
third column.  
Printing the Menu Settings  
3. Press SHIFT + SEL to exit the Menu Mode and save  
1. Make sure paper is loaded in the printer.  
2. Enter the Menu Mode (SHIFT + SEL).  
3. Press PRINT (PARK).  
your settings.  
Important! If you turn the printer off without first exiting  
the Menu Mode, the changes you have made  
will be lost.  
Note: To print out a listing of the settings for all menu  
items, regardless of the emulation selected or the  
accessories installed, enter the Menu Mode, then  
press SHIFT + PRINT QUALITY.  
Help Guide  
15  
 
Summary of Menu Settings  
The table below shows the items which may appear in the menu. Settings which are engaged at the factory (defaults) are set in bold  
italic. Some groups or entries will only appear when a specific emulation is engaged, as noted.  
Group  
Item  
Setting  
Printer Control Emulation Mode  
IBM PPR, EPSON FX, ML  
Font  
Print Mode  
Draft Mode  
Pitch  
Utility, NLQ Courier, NLQ Gothic, DRAFT  
HSD, SSD  
10 cpi, 12 cpi, 15 cpi, 17.1 cpi, 20 cpi  
Proportional Spacing  
Style  
No, Yes  
Normal, Italics  
Size  
Single, Double  
Symbol Sets  
Character Set  
Language Set  
Set I, Set II, Standard*, Line Graphics*, Block Graphics*  
ASCII, French, German, British, Danish I, Swedish I, Swedish II, Swedish III,  
Swedish IV, Italian, Spanish I, Japanese, Norwegian, Danish II, Spanish II,  
Latin American, French Canadian, Dutch, TRS 80, Turkish, Swiss I, Swiss II, Publisher  
Slashed, Unslashed  
USA, Serbo Croatic II, Canada French, ECMA-94, Multilingual, Windows East Europe,  
Portugal, Windows Greek, Norway, Latin 5 (Windows Turkey), Baltic 774, Windows  
Cyrillic, East Europe Latin II-852, Cyrillic I-855, Hungarian CWI, Turkey 857,  
Ukrainian, Cyrillic II-866, ISO Latin 6, Greek_869, Hebrew NC (862), Kamenicky  
(MJK), Hebrew OC, Greek_437, Windows Hebrew, Greek_437 CYPRUS, Windows  
Baltic, Turkey, Bulgarian, Polska Mazovia, Greek_928, ISO Latin 2, Serbo Croatic I  
Zero Character  
Code Page  
Slashed Letter O  
No, Yes  
* Appears only when the MICROLINE Standard emulation is selected.  
16  
ML3320/21  
 
Group  
Item  
Settings  
Rear Feed  
Line Spacing  
6 LPI, 8 LPI  
Form Tear-Off  
Off, 500 mS, 1 sec, 2 sec  
Skip Over Perforation  
Page Width (ML3321 only)  
Page Length  
No, Yes  
13.6", 8"  
11", 11-2/3", 12", 14", 17", 3", 3.5", 4", 5.5", 6", 7", 8", 8.5"  
Bottom Feed  
Top Feed  
Line Spacing  
Form Tear-Off  
Skip Over Perforation  
Page Width (ML3321 only)  
Page Length  
6 LPI, 8 LPI  
Off, 500 mS, 1 sec, 2 sec  
No, Yes  
13.6", 8"  
11", 11-2/3", 12", 14", 17", 3", 3.5", 4", 5.5", 6", 7", 8", 8.5"  
6 LPI, 8 LPI  
Line Spacing  
Bottom Margin  
Valid, Invalid  
Page Width (ML3321 only)  
Page Length  
13.6", 8"  
11", 11-2/3", 12", 14", 16.57", 3", 3.5", 4", 5.5", 6", 7", 8", 8.5"  
Wait Time  
500 mS,1 sec, 2 sec  
Page Length Control  
Graphics  
By MENU Setting, By Actual Page Length  
Bidirectional, Unidirectional  
Set-Up  
7 or 8 Bit Graphics*  
Receive Buffer Size  
Paper Out Override  
Print Registration  
8, 7  
1 Line, 16K, 28K  
No, Yes  
0.25 mm Right, 0.20 mm Right, 0.15 mm Right, 0.10 mm Right, 0.05 mm Right, 0,  
0.05 mm Left, 0.10 mm Left, 0.15 mm Left, 0.15 mm Left, 0.15 mm Left  
7 or 8 Bits Data Word*  
8, 7  
* Appears only when the MICROLINE Standard emulation is selected.  
Help Guide  
17  
 
Group  
Item  
Settings  
Set-Up  
continued  
Operator Panel Function  
Reset Inhibit  
Full Operation, Limited Operation  
No, Yes  
Print Suppress Effective  
Auto LF  
Auto CR+  
Yes, No  
No, Yes  
No, Yes  
Print DEL Code*  
SI Select Pitch (10 cpi)+  
SI Select Pitch (12 cpi)+  
Time Out Print  
Auto Select  
No, Yes  
17.1 cpi, 15 cpi  
20 cpi, 12 cpi  
Valid, Invalid  
No, Yes  
Centring Position  
I-Prime  
Pin 18  
DEFAULT, MODE 1, MODE 2***  
Buffer Print, Invalid, Buffer Clear  
+5V, Open  
Parallel I/F  
Auto Feed XT**  
Invalid, Valid  
* Appears only when the MICROLINE Standard emulation is selected.  
+ Appears only when the IBM emulation is selected.  
** Applies only when the Epson emulation is selected.  
*** ML3321 only.  
18  
ML3320/21  
 
Character Set. Choose IBM Set I or IBM Set II.  
Explanations of Menu Items  
Code Page. Choose the Code Page character set you wish to  
use: USA (IBM 437), Canada French (IBM 863),  
Multilingual (IBM 850), Portugal (IBM 860), Norway (IBM  
865), BRASC II, or Abicomp.  
7 or 8 Bits Data Word (ML). If your computer system uses  
seven bits to make up each unit of data, change this setting to 7.  
7 or 8 Bit Graphics. Choose the graphics your system uses:  
7 or 8 dots in each column printed.  
Draft Mode. Change to SSD if you wish to use the Super  
Speed Draft mode of printing. Note: Print Mode must be set  
to DRAFT for this setting to be effective.  
Auto CR (IBM). If you want the printer to automatically  
add a carriage return when a Line Feed is received at the end  
of a line, change the setting to Yes.  
Emulation Mode. Choose the printer emulation.  
Auto LF. If your printout is consistently double spaced, select  
No; if it overprints, select Yes.  
Form Tear-Off. Choose 500 mS, 1 sec, or 2 sec to turn the  
Form Tear-Off feature on and to set the time interval for the  
printer to wait before advancing the paper.  
Auto Feed XT (Epson). If your system uses pin 14 of the  
parallel interface to control automatic line feed, change the  
setting to Valid.  
Graphics. Change to bidirectional graphics for faster  
printing: optimise the registration using the Print Registration  
menu item.  
Auto Select. If you always use the sameTop of Form position,  
change the setting to Yes.  
I-Prime. Determines what the printer will do when it receives  
the I-Prime signal from the host: Buffer Print prints out the  
buffer contents before resetting; Buffer Clear dumps the buffer  
contents immediately. Invalid causes the printer to ignore  
the I-Prime signal.  
Bottom Margin. Change to Invalid if you want the printer  
to ignore the bottom margin setting. Caution! This can cause  
loss of data and damage the printhead.  
Centring Position. Choose DEFAULT, Mode 1 or Mode 2.  
Help Guide  
19  
 
Language Set. Replaces certain standard symbols with Print Registration. Change the setting as required to obtain  
special characters used in foreign languages.  
the best registration for bidirectional printing.  
Line Spacing. Change to 8 lpi to print more lines on a page. Print Suppress Effective. If your system uses the DC1 and  
DC3 codes for something other than the print suppress mode,  
change the setting to No.  
Operator Panel Function. Change to Limited Operation to  
deactivate the PRINT QUALITY and CHARACTER PITCH  
buttons. This prevents these from being changed via the Proportional Spacing. Change the setting to Yes to engage  
control panel when multiple people are using the printer.  
proportional spacing of characters.  
Page Length. Selects the length of the paper you are using. Receive Buffer Size. Selects the amount of memory devoted  
to holding received data. Choosing 1 Line will tie up your  
Page Width (Model 3321 only). Change to 8" to print on  
computer while printing, but if you abort the print job, the  
letter-size paper.  
printer will stop much sooner.  
Paper Out Override. Senses when less than 1" (25 mm) of  
Reset Inhibit. Select Yes to prevent your software from  
paper remains, and stops printing. Change toYes to override  
resetting your printer's settings.  
the sensor. Caution! This can cause loss of data and damage  
the printhead!  
SI Select Pitch, 10 cpi (IBM). Sets the pitch to be engaged  
when the printer control panel is set for 10 cpi and the SI  
command is received.  
Pin 18. Sets the signal on pin 18 to +5 volts or to open.  
Pitch. Choose the character width, in character per inch (cpi).  
SI Select Pitch, 12 cpi (IBM). Sets the pitch to be engaged  
when the printer control panel is set for 12 cpi and the SI  
command is received.  
Print DEL Code (ML). Change to Yes if you wish to print  
the DEL code (decimal 27) as a solid box.  
Print Mode. Choose the quality and speed of printing.  
Size. Change to Double for double width and height printing.  
20  
ML3320/21  
 
Skip Over Perforation. Change toYes if you want the printer  
to go to the next page when it comes within 1" (25 mm) of  
the bottom of the page. Keep it set to No if your software has  
its own page formatting controls.  
Using the Printer's Features  
Tear Feature  
Use this feature to advance continuous-form paper up to the  
tear position by simply pressing TEAR ().  
Slashed Letter O. If set toYes, capital and lower case slashed  
O (Ø and ø) will appear at locations 9Bh and 9Dh respectively  
in USA code page. If set to No, the characters “¢” and “¥”  
will appear at these locations.  
SEL  
FF/LOAD  
TEAR  
SET  
PARK  
QUIET  
TOF  
LF  
SEL  
Micro Feed  
Down  
Micro Feed  
Up  
SHIFT  
MENU  
PRINT  
ITEM  
EXIT  
GROUP  
POWER  
ALARM  
MENU  
Style. Change to italics if you want the printed characters to  
be slanted.  
Note: The Tear Feature can not be used when the optional  
pull tractor is engaged.  
Time Out Print. If your software spends a long time  
processing between portions of data it feeds to the printer,  
change the setting to Invalid to keep your printer from  
inadvertently dumping the received data while it is waiting  
for more.  
Forms Tear-Off Feature  
Important! Never engage Forms Tear-Off when printing  
on labels!  
Wait Time. Sets the amount of time the printer will wait for  
more data before moving to the form tear-off position.  
Zero Character. If you do not want the printer to use a slash  
to distinguish the number zero from the capital letter O,  
change the setting to Unslashed.  
The Forms Tear-Off feature automatically moves  
continuous-form paper up to the tear position after the interval  
you select, then moves it back down again for printing when  
the printer receives more data.  
Help Guide  
21  
 
This feature is normally turned off. To activate it:  
Note: Some programs pause occasionally while sending  
data. If the pause is too long, the paper will advance  
to the tear-off position until more data is received.  
This extra paper movement can cause uneven print  
registration in graphics. If you have this problem,  
use the menu to turn off this feature.  
1. Press SHIFT () + SEL ().  
➊ ➋ ➌  
SEL  
FF/LOAD  
TEAR  
SET  
PARK  
QUIET  
TOF  
LF  
SEL  
Micro Feed  
Down  
Micro Feed  
Up  
SHIFT  
MENU  
Paper Park Feature  
PRINT  
ITEM  
EXIT  
GROUP  
POWER  
ALARM  
MENU  
SEL  
2. Press GROUP () until one of the following lines  
FF/LOAD  
TEAR  
SET  
PARK  
QUIET  
TOF  
LF  
SEL  
Micro Feed  
Down  
Micro Feed  
Up  
SHIFT  
MENU  
appears, depending on which paper feed you are using:  
PRINT  
ITEM  
EXIT  
GROUP  
POWER  
ALARM  
MENU  
REAR FEED Form Tear-Off OFF  
BOTTOM FEED Form Tear-OFF OFF  
To retract rear-feed paper from the paper path, press PARK  
().  
3. Press SET () until the time interval you wish to select  
appears in the third column.  
4. Press SHIFT () + SEL () to exit Menu Mode and  
save the setting.  
22  
ML3320/21  
 
Emulations  
Interface  
Epson FX, IBM Proprinter III, and  
Oki Microline Standard co-resident  
Specifications  
Print Method Impact dot matrix  
Standard: Centronics parallel  
Optional: RS-232C serial  
Printhead  
9 pins, 0.34mm diameter, thermal protection  
Print Speed  
Mode  
Characters per second  
435 cps  
Graphics Resolution  
Super Speed Draft (SSD)  
High Speed Draft (HSD)  
Utility (UTL)  
Emulation  
Maximum Resolution  
387 cps  
Epson/IBM  
240 (H) x 216 (V) dpi  
288 (H) x 144 (V) dpi  
290 cps  
Oki ML Std.  
Near Letter Quality (NLQ) 72.5 cps  
Resident Fonts  
Characters per Line (CPL)  
Setting ML3320  
Print Quality  
Available Fonts  
ML3321  
136 cpl  
163 cpl  
204 cpl  
233 cpl  
272 cpl  
Near Letter Quality  
Courier, Gothic  
Gothic  
10 cpi  
12 cpi  
15 cpi  
17.1 cpi  
20 cpi  
80 cpl  
Utility  
96 cpl  
High Speed Draft  
Super Speed Draft  
Gothic  
Gothic  
120 cpl  
137 cpl  
160 cpl  
Bar Codes  
Code 39, UPC A, UPC E, EAN 8, EAN 13,  
Interleaved 2 of 5, Code 128, Postnet  
Receive Buffer Size 28K  
Help Guide  
23  
 
Reliability  
Paper Specifications  
Parameter  
Reliability  
Paper Type Feed  
Weight  
Width Range  
Mean Time Between Failures 10,000 hours at 25% duty  
Cut sheets  
Top Only 58 - 90 g/m²  
(14 - 24 lb.)  
ML3320: 182.9-215.9  
(7.2" - 8.5")  
(MTBF)  
cycle and 35% page density  
ML3321: 182.9 - 363.2mm  
(7.2 - 14.3")  
Mean Time to Repair  
(MTTR)  
15 minutes  
Single-part  
continuous  
forms  
Rear,  
45 - 90 g/m²  
ML3320: 76.2-254mm  
(3" - 10")  
ML3321: 76.2-406.4mm  
(3" - 16")  
Printhead Life  
200 million characters  
average in 10 cpi draft mode  
at 25% duty and 35% page  
density  
Bottom (12-24 lb.)  
Carbonless  
continuous  
forms  
Rear,  
34 - 41 g/m²  
ML3320: 76.2-254mm  
(3" - 10")  
ML3321: 76.2-406.4  
(3" - 16")  
Ribbon Life (on average,  
10 cpi utility)  
3 million characters  
Bottom (9 - 11 lb.)  
Paper Width  
Minimum: 76.2mm (3")  
Maximum, ML3320: 254mm (10")  
Maximum, ML3321: 406.4mm (16")  
Interleaf  
continuous  
forms  
Rear,  
Paper 38 - 45 g/m² ML3320: 76.2-254mm  
Bottom (10 - 12 lb.)  
Carbon 34 g/m²  
(9 lb.)  
(76.2 - 254mm)  
ML3321: 76.2-406.4mm  
(3" - 16")  
Paper Weight  
45 to 90 g/m² (12 to 24 lb.)  
Labels  
Bottom  
Only  
ML3320: 3" - 10"  
(76.2 - 254mm)  
ML3321: 3" - 16"  
(76.2 - 406.4mm)  
Paper Thickness  
Rear Feed: 0.36mm (0.014") max.  
Bottom Feed: 0.44mm (0.017") max.  
24  
ML3320/21  
 
Paper Specifications (continued)  
Environmental Requirements  
Paper Type  
Feed  
Weight  
Width Range  
Parameter  
Range  
Envelopes,  
single feed  
Top Only 24 lb. max.  
(90 g/m²)  
165.1 - 241.3mm  
(6.5" - 9.5")  
Operating Temperature  
Storage Temperature  
Operating Humidity  
Storage Humidity  
41 to 104°F (5 to 40°C)  
14 to 122°F (-10 to 50°C)  
20 to 80% RH  
Envelopes,  
continuous feed,  
non-overlap  
Bottom  
Only  
24 lb. max.  
(90 g/m²)  
165.1 - 241.3mm  
(6.5" - 9.5")  
5 to 95% RH  
Electrical Requirements  
240 volts ac (+10%, -14%),  
50/60 Hz (±2%)  
Card stock  
Bottom  
Only  
120 lb. max.  
(178 g/m²)  
N.A.  
Transparencies  
Top Only  
215.9 - 279.4mm  
(8.5" - 11")  
This product complies with the requirements of the Council  
Directives 89/336/EEC and 73/23/EEC on the approximation  
of the laws of the member states relating to electromagnetic  
compatibility and low voltage.  
Dimensions (W x D x H)  
ML3320: 389 x 345 x 116 mm  
ML3321: 430 x 345 x 116 mm  
Weight  
ML3320: 7 Kg  
ML3321: 9 Kg  
Specifications subject to change without notice.  
Help Guide  
25  
 
Index  
A
F
L
Continuous-form paper  
Auto  
Factory settings, menu . 16-18 Label specifications .......... 24  
jams, clearing .............. 2-4  
specifications ................ 24  
Control panel ................ 11-14  
CR menu setting ........... 18  
Form tear-off feature ......... 21  
menu setting ................. 19  
Front panel ................... 11-14  
Language set menu  
feed XT menu setting ... 18  
LF menu setting............ 18  
select menu setting ....... 18  
setting ............................... 16  
Lights, control panel ... 11, 14  
Line spacing menu setting 17  
D
G
M
Defaults, menu ............. 16-18  
resetting ........................ 15  
Dimensions ........................ 25  
Draft mode menu setting .. 19  
Graphics menu setting ...... 17  
Graphics resolution ........... 23  
B
Maintenance ..................... 1-7  
Menu mode................... 14-21  
Bar codes ........................... 23  
Bottom margin menu  
H
setting ............................... 17  
O
Humidity requirements ..... 25  
E
Operator panel function  
C
Electrical requirements ..... 25  
Emulation mode menu  
setting ............................... 16  
Envelope specifications..... 25  
Environmental  
I
menu setting ..................... 20  
Card stock specifications .. 25  
Centring position menu  
setting ............................... 18  
Character pitch .................. 14  
Characters per line ............ 23  
Character set menu  
Indicator lights ............ 11, 14  
Interface............................. 23  
I-Prime menu setting ......... 19  
P
Page length menu setting .. 20  
Page width menu setting ... 20  
Panel, front ................... 11-14  
Paper  
jams, clearing .............. 2-6  
specifications ................ 24  
Paper out override menu  
setting ............................... 20  
requirements..................... 25  
J
Jams, paper ....................... 2-6  
setting ............................... 16  
Code page menu setting .... 16  
26  
ML3320/21  
 
R
T
Paper park feature ............. 22 Rear feed paper  
Tear-off feature .................. 21  
Pin 18 menu setting........... 20  
Pitch menu setting ............. 20  
Print DEL code menu  
jams.............................. 2-5 Temperature requirements 25  
Receive buffer size ...... 20, 23 Time out print menu  
Reliability .......................... 24  
setting ............................... 21  
Transparency  
setting ............................... 20 Reset inhibit menu  
Print mode menu setting ... 20  
Print quality ....................... 13  
Print registration menu  
setting ............................... 20  
Resident fonts .................... 23  
Ribbon replacement ............ 1  
specifications.................... 25  
Troubleshooting ............. 8-10  
setting ............................... 20  
Print speed ......................... 23  
Print suppress effective  
W
S
Wait time menu setting ..... 21  
Weight ............................... 25  
SI select pitch menu  
menu setting ..................... 20  
Printhead specifications .... 23  
Problem solving ............. 8-10  
Proportional spacing  
settings ............................. 20  
Single sheet paper jams,  
clearing............................... 6  
Size menu setting .............. 20  
Skip over perforation  
Z
Zero character menu  
setting ............................... 21  
menu setting ..................... 20  
menu setting ..................... 21  
Specifications ............... 23-25  
Style menu setting ............. 21  
Help Guide  
27  
 
Oki Systems Company  
Oki Systems (UK) Limited  
550 Dundee Road  
Slough Trading Estate  
Slough  
Berks. SL1 4LE  
Tel: 01753-819819  
Fax: 01753-819899  
28  
ML3320/21  
 

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