A798 Thermal Receipt Printer
User Guide
Made under one or more of the following U.S. patents:
4886381, 5579043, 5613787, 5651624, 5713678, 5752779, 5789916,
5800080, 5879090, 5887999, 5975776, 6027266, 6085973, 6089450,
6129465, 6155483, 6404452, 6486902, 6504331, 5749277, 6722754,
6739773, 6784909.
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Contents
3
Contents
Contents...............................................................................................3
Chapter 1: About this Guide .................................................................5
How to use this guide .........................................................................5
Where to !nd advanced technical information................................5
Download manuals and drivers ......................................................................5
Support................................................................................................5
Chapter 2: About the Printer ................................................................6
Description of printer .........................................................................6
Printer controls....................................................................................7
Available printer con!gurations........................................................8
Printer con!guration identi!cation ..................................................8
Communication interfaces ................................................................8
Standard Features...............................................................................9
Factory-installed options ...................................................................9
Add-on options ...................................................................................9
Printing features .................................................................................9
Chapter 3: Setting up the Printer .......................................................11
Unpack the printer............................................................................11
Check the packing list.......................................................................11
Load or change the receipt paper....................................................12
Changing the paper path width.......................................................13
Mounting the 55-watt power supply on a vertical surface ...............
(using optional kit A798-K309)........................................................14
Spill shield option installation.........................................................14
Connect the cables............................................................................15
Cash drawer cables ...........................................................................15
Communication cables .....................................................................16
RS-232C cable (9-pin and 25-pin) and Parallel........................................ 16
USB cable.............................................................................................................. 17
Powered USB cable........................................................................................... 17
Power supply cable ..........................................................................18
Cable routing.....................................................................................19
Test the printer ..................................................................................19
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Contents
Chapter 4: Using the Printer ...............................................................20
Con!guring the printer ....................................................................20
Monochrome paper print density ...................................................23
When to change the receipt paper ..................................................24
Printhead Setting..............................................................................24
Preventing overheating of the printhead.......................................25
Troubleshooting the printer ............................................................26
Printer tone and green LED..............................................................26
Printing issues ...................................................................................27
Printer does not function .................................................................28
Chapter 5: Paper and Supplies ...........................................................29
Ordering from TPG............................................................................29
Ordering thermal paper ...................................................................29
Thermal paper speci!cations...........................................................29
Quali!ed Paper Grades.....................................................................30
Cash drawers .....................................................................................31
Power supply and power cords........................................................31
Wall-mount kits .................................................................................32
Documentation and utilities ............................................................32
A798 Thermal Receipt Printer: User Guide
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Chapter 1: About this Guide
5
Chapter 1: About this Guide
How to use this guide
The guide is designed to help you find the information you need quickly and easily, whether you are installing, servicing,
or making adjustments to a TPG printer. The chapter headings are self-explanatory, and the index at the back can also point
you in the right direction.
For basic printer setup, refer to Chapter 3: Setting up the Printer. This section has been written under the assumption that
the printer will arrive pre-configured. For instructions on checking the configuration or reconfiguring the printer, look in
Chapter 4: Using the Printer.
Having problems? Check the troubleshooting section in the back of Chapter 4.
Need paper specs? Look in Chapter 5: Paper and Supplies.
Where to !nd advanced technical information
Since TPG printers are shipped pre-configured and have been designed to operate with no maintenance, this guide provides
only essential technical and configuration information. TPG also has a Programming Guide for this printer with more
detailed discussion of programming capabilities. The A798 Programming Guide has been developed as a companion
to the User Guide and includes additional programming information. The A798 Service Guide is available to qualified
service technicians who have been certified by TPG to perform advanced procedures.
Because of the printer’s wide array of printing capabilities, you may prefer to contact TPG support for more assistance.
Download manuals and drivers
The A798 Setup Guide, A798 User Guide, A798 Programming Guide, and various printer drivers can be downloaded
Support
For more advanced procedures and troubleshooting, you may need to refer to the printer’s programming or service guides
or speak to TPG technical support. Your TPG representative is also able to provide you with necessary information.
The Web site can also direct you to service and support within your area, or e-mail: [email protected].
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Chapter 2: About the Printer
Chapter 2: About the Printer
Description of printer
The A798 thermal receipt printer is easy to install, use, and maintain. Utilizing TPG’s Clam shell design, simply snap
open the receipt cover and drop the paper roll in place. You never need to change a printer ribbon or cartridge because it
uses thermal printer technology.
Switches 1 & 2 are
shown in the
normal OFF position
Off
On
1
2
DIP Switches
Connector
Cover Open
Receipt Cover
Receipt Paper
Paper Feed Button
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Chapter 2: About the Printer
7
Printer controls
LED
(Green)
Paper
Feed
Button
Con!guration switch (DIP switch 1)
The configuration switch allows you to change the configuration settings of the printer.
Paper feed button
During normal use, the paper feed button advances the paper. It is also used to access the configuration menu.
LED
The green LED indicates basic information about the printer status. A steady green light means the printer is on and
operating normally. A flashing LED means the printer needs operator assistance. Refer to the troubleshooting section on
page 30 for more information.
Beep
A single beep means the printer has successfully completed its startup routine. It should beep after being powered up or
reset.
If the printer beeps twice, it may be experiencing a problem. Refer to the troubleshooting guide on page 30 for more
information.
Connector Cover
The connector cover provides protection and strain relief for the printer connectors and cables. This cover should remain
on the printer and utilized as described in Chapter 3, Cable routing.
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Chapter 2: About the Printer
Available printer con!gurations
There are several configurations of the printer, depending on the combination of desired options.
Printer con!guration identi!cation
See the sample below to determine the printer configuration. The printer configuration identification (Model ID) is located
on the model label attached to the back of the printer. This information is also shown on the installation quality report card.
The Model ID description is shown below.
Communication interfaces
•
RS-232C serial interface (25-pin)
•
•
Parallel
•
Universal Serial Bus (USB)/RS232 serial (9-pin)
Powered USB
D = 9-pin RS-232/USB
N = No Interface
S = 25-pin RS-232C
W = Powered USB
N = No Logo
T = TPG Logo
2 = 2 MB Flash
D = Power Supply and Domestic Cord
I = Power Supply and International Cord
N = No Power Cord
1 = Gray
2 = Dark Gray
7 = Black
P = Power Supply
U = Power Supply and UK Cord
Model
Cust. Part No.
Revision
A798-XX0X-XXXX
Ithaca, N.Y.
Assembled in
Mexico
Serial No.
Canada
ICES/NMB-003
Class/Classe
A
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Chapter 2: About the Printer
9
Standard Features
Interfaces
Interfaces vary according to speci!c con!guration: USB/RS232 , 25-pin serial, PUSB, Parallel
Memory/Firmware
2 MB "ash memory, History EEROM, 4K bu#er
(see factory-installed options below for additional memory)
Resident character sets
PC code pages 437 (US), 850 (Multilingual), 737 (Greek), 852 (Slavic), 857 (Turkish),
858 (with Eurosymbol), 860 (Portuguese), 862 (Hebrew), 863 (French Canadian), 865 (Nordic),
866 (Cyrillic), 1252 (Windows Latin 1), and 857 (Turkish)
Downloadable Fonts
Integrated bar codes
TBA
Code 39, Code 93, Code 128, UPC-A, UPC-E, JAN8 (EAN), JAN13 (EAN), Interleaved 2 of 5,
Codabar, Code 128, PDF-417 (two-dimensional), ITF, Code 128 extended, RSS
Print
Monochrome in either 44 (standard) or 56 (compressed) columns on
80 mm wide thermal paper
Monochrome in either 49 (standard) or 62 (compressed) columns on
82.5 mm wide thermal paper
Options for 58 mm and 60 mm wide paper are also available
58 mm, 60 mm, 80.0 mm, 82.5 mm paper path width models
8-dots/mm
Paper path
Print resolution
Speed
Up to 150 mm/second throughput (monochrome)
Paper out
Paper Sensing
Human interface
Audible tone from speaker (software-driven). Simple commands in con!guration menu
issued through paper feed button. Green LED status light, located next to the paper feed
button.
Cash drawer driver
Knife
Connector for one or two cash drawers (obtain a “Y”cord for two drawers)
Paper cutter standard on all units.
Factory-installed options
•
Cabinet color with or without TPG logos
Add-on options
For part numbers and additional ordering information, refer to Chapter 5: Paper and Supplies.
•
•
•
•
•
Wall mount kit for printer
Wall mount kit for power supply
Enhanced spill resistant attachments: spill shield
Power supply: 55-watt or 75-watt
Power cords: US, SEV, UK AC, and Australia AC cords
Printing features
The A798 printer is versatile, with diverse printing options available. Text, graphics, and bar codes can be presented
in many different forms and sizes. For more information on programming the printer to change text, graphics, or other
characteristics, refer to the A798 Programming Guide.
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Chapter 2: About the Printer
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Chapter 3: Setting up the Printer
11
Chapter 3: Setting up the Printer
Unpack the printer
Check the packing list
Save the packing materials in case you need to repack the printer for shipping or storage. Before installation, check that all
the items on this list have been shipped (printers shipped in bulk may not include all these items):
•
•
•
•
•
•
Printer (enclosed in a plastic bag with foam pack)
Starter roll of receipt paper (in paper compartment), with paper roll supports
Test printout (in paper compartment).
Setup Guide
Power supply with cable and cord (if ordered)
Printer-host communication cable (if ordered)
To report any missing items or shipping-related problems, contact your representative or call TPG customer service at
(877) 209-0156
Setup Guide
(in Plastic Bag)
Communication
Cable (Optional)
A798/A799 Printer
(in plastic bag) with
Power Supply with
Cable and Cord
(Optional)
Starter Roll Inside Printer
Cardboard Accessory Sleeve
Cardboard
Printer Sleeve
Shipping Carton
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Chapter 3: Setting up the Printer
Load or change the receipt paper
Caution: You must use qualified paper rolls with TPG printers. The list of qualified paper is in Chapter 5. Using
unqualified paper may void the warranty.
You will later use the same procedure to change the receipt paper as you will to load it during installation. The minor
difference is noted in the directions below.
If you are installing the printer using the wall mount kit, you may find it easier to load the paper roll after installation.
1
1 Open the receipt cover by pushing up evenly on each side of the cover until it unsnaps (1).
2
Loading: Remove the test printout (2) and starter roll. Slide the supports off the roll (3).
Changing: Remove the used paper roll.
3 Tear a clean edge on the new receipt paper roll, making sure the tape has been completely removed.
4 Place the receipt paper into the paper compartment so it unrolls from the bottom (4). Leave a few inches of paper
sticking out of the printer.
5 While holding the paper in place, close the receipt cover (5). To test that the paper is loaded correctly, advance the
paper with the paper feed button.
Note: If the paper jams, make sure the roll is inserted correctly. Check the illustration above for proper orientation.
6 Tear the excess paper off against the blade in the cover (6).
4
6
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Chapter 3: Setting up the Printer
13
Changing the paper path width
The A798 can be adjusted to print on paper rolls with widths of 58 or 60 mm. To perform this adjustment, please refer to
the A798 Service Guide. A trained service technician must perform this adjustment.
Note: The A798 printer can also print on paper rolls 82.5 mm wide. This option for the printer is factory installed. Please
contact TPG for details.
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Chapter 3: Setting up the Printer
Mounting the 55-watt power supply on a vertical surface
(using optional kit A798-K309)
1 Select a location that allows adequate support for
the power supply and reaches an electrical outlet and
the printer. Mount the bracket using the instructions
provided with the A798 power supply wall-mount kit.
Power
Supply
Bracket
Power
Supply
2 Set the power supply (K301, available separately) onto
the bracket and secure with the provided tie wrap.
Ty-Wrap
Caution: Do not plug in the power supply until all the
Cord
cables are connected, as this may damage the
printer. (See next section page 15.)
Ty-Wrap
Screws &
Anchors
Bracket
Cord
Spill shield option installation
Top and bottom spill shields provide added protection for your printer from moisture or spills. The following instructions
describe how to install both of these shields. Shields may be installed individually or as a set.
Tools:
Phillips head screwdriver
1
Drill 5/16” hole
2
To install the top spill shield:
1 Clean the printer receipt cover in the area where the top spill cover is to be installed.
2 Remove receipt cover and drill holes using a #5/32 or 4 mm drill bit (as shown). Open holes further by drilling with a
5/16 or 8 mm drill bit.
3 Position the spill shield to the printer.
4 Fasten spill shield to receipt cover with screws and washers provided.
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Chapter 3: Setting up the Printer
15
Connect the cables
Cable connections are made at the back of the printer.
Caution: Connect the cables to the printer before applying power. The host computer should always be turned off before
connecting communication cables.
Cash drawer cables
The cash drawer cable connects the printer to one or two cash drawers.
(For pin-out, see Service Guide.)
To install the cash drawer cable:
1 Open the connector cover.
2 Plug the cable into the cash drawer connector located at the right side of the illustration.
3 Route the cable up and through the strain relief clip above the connector and through the opening in the connector
cover when shut.
Note: If installing two cash drawers, you will need to obtain a Y-cable as shown in the illustration below.
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Chapter 3: Setting up the Printer
Communication cables
According to your printer configuration, the printer has different communication connection options. Select and attach
either 9-pin RS-232C, 25-pin RS-232C, standard USB, or powered USB communication cable to the printer and host
computer.
For printers with both 9-pin RS-232C and USB connectors, only a single communication connection is to be used during
operations.
RS-232C cable (9-pin and 25-pin) and Parallel
The communication cable connects the printer to the host computer using either the 9-pin or 25-pin RS-232C interface.
Installation is identical for both connectors.
9-pin RS-232C
communication
connector
To install the communication cable:
1 Make sure the host computer is off.
2 Open the connector cover at the rear of the printer.
3 Attach the communication cable to the communication connector, shown in the center in the illustration. Tighten the
screws to secure the cable and ensure a stable connection.
4 Connect the cable to the host computer.
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Chapter 3: Setting up the Printer
17
USB cable
Unlike the other connections, the USB cable may be attached and detached while the system is operating.
Using the USB connector with the printer requires that you install the TPG USB driver appropriate for your system. If you
are replacing a USB-equipped TPG printer, you may not need to reinstall the driver.
Printer end
of USB cable
Computer end
of USB cable
To install the USB cable:
1 Open the connector cover at the rear of the printer.
2 Attach the USB cable to the USB connector, shown at the left above (A). Don’t plug the USB cable into the cash
drawer connector (B) by mistake! Doing so may damage the printer. The USB symbol should face up when inserted
into the port. Make sure the connection is snug.
3 Route the cable through the strain relief on the connector cover (see the “Cable routing” section which follows on page
22).
4 Connect the cable to the USB port in the host computer. Again, make sure the USB symbol on the connector is face up
when you plug it into the port.
After you have completed setting up the printer, you can install the USB driver on the host computer.
Downloads can be found in the Service & Support section of the site.
Powered USB cable
Powered USB communication connector panel
Powered USB
connector
Printer end
of USB cable
Computer end
of USB cable
1 Be sure the host computer is turned off.
2 Plug the printer end of the USB cable into the USB connector port on the printer.
3 Route the cable from the printer through the strain relief tab as shown under Cable Routing on page 19.
4 Plug the computer end of the USB cable into the computer.
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Chapter 3: Setting up the Printer
Power supply cable
Connector Interface Panel
Power
Supply
Connector
To avoid damaging the printer, connect the power supply last.
1 Plug the power cable into the power connector located in the center of the illustration.
2 Close the connector cover until it snaps, making sure that all the cables are aligned with the slots in the connector cover.
Double-check that the strain relief on the connector cover is aligned with the power supply cable (see “Cable routing”
section which follows).
3 Plug the power cord into the power supply.
4 Plug the power supply into a grounded outlet. When it is properly powered, the green LED on the top of the printer will
light up.
WARNING! Using this device without a grounded outlet is a safety hazard and voids the printer Warranty, Safety, FCC
and CE Mark designation.
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Chapter 3: Setting up the Printer
19
Cable routing
To prevent the printer from becoming unplugged accidentally, make sure the cables are routed as shown in the illustration
below.
For USB printers only:
Guide the USB cable through the strain relief and out the slot in the connector cover, as shown in the illustration. The
USB cable fits underneath the power supply and cash drawer cables. The RS-232C cable routes straight out the back when
attached.
Test the printer
If the printer is functioning normally, it will beep once. If it responds differently, look in Chapter 4: Using the Printer,
“Troubleshooting the printer” (page 31) or contact TPG for technical support.
The printer will arrive for installation pre-configured. The printer’s current configuration appears on the test (diagnostics)
printout. However, if you would like to run a new print test or check the configurations, you can run a diagnostics printout
detailing the current configuration.
To run a diagnostic test:
1 Make sure paper is in the printer (1).
Receipt Cover
2 Open the receipt cover (2).
2
3 Press and hold the paper feed button (3).
Paper Feed Button
4 Close the receipt cover, continually holding the paper
4
feed button until the configuration printout begins (4).
For further instructions, see Chapter 4: Using the printer,
“Configuring the printer” (page 20).
3
1
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Chapter 4: Using the Printer
Chapter 4: Using the Printer
Con!guring the printer
The configuration menu allows the user to set general printer parameters. The test prints the diagnostics form, which
details settings for all functions. The printer will partially cut the paper between each variation.
The printouts may vary for each model. The test ends with a partial cut of the paper. A complete test printout may require
the use of several feet of paper.
Since the printer is usually shipped pre-configured, most users do not need to change the configuration of the printer. If
you make adjustments to the configuration, be careful not to inadvertently change settings that may affect the printer’s
performance. TPG does not recommend that users change the printer configuration.
Additional information on configuring the printer is found in the A798 Programming Guide.
Hint: The printer is shipped with a test printout that includes the preset configuration. If you run into problems after
changing the printer configuration, use these settings as a default. For guidance or assistance, you may contact an TPG
representative.
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Chapter 4: Using the Printer
21
To enter the con!guration mode:
Tfu!txjudi!2!up!uif
PO!qptjujpo!)epxo*
Pgg
Po
2
3
EJQ!Txjudift
Dpoofdups
Dpwfs!Pqfo
Sfdfjqu
Dpwfs
Sfdfjqu
Qbqfs
Qbqfs!Gffe
Cvuupo
1 Open connector cover (1).
5 To communicate with the printer, you will press the
paper feed button using either short or long clicks. Use
a long click for “yes” (more than one second) and a
short click for “no.” Follow the printed instructions to
make selections.
2 Set DIP switch 1 to the ON position (down) (2).
DIP switch 2 should be in the OFF position (up).
3 Make sure receipt paper (3) is loaded in the printer
before proceeding. (See page 12.)
6 Continue through your menu selections until you are
4 Cycle DIP switch 2 down (reset ON position), then up
asked, “Save New Parameters?” Select “Yes” or “No.”
(normal OFF position).
a If you wish to save, select “Yes,” then return DIP
- or -
Switch 1 to the OFF position (up).
Press and hold the paper feed button (4), close the
receipt cover (5), continually holding the paper feed
button until the configuration printout begins.
b Open the receipt cover.
Press and hold the paper feed button while closing
the receipt cover.
•
The printer beeps, then prints the diagnostics form
and the configuration main menu.
•
The diagnostic printout verifies your new settings.
7 If you would like to continue configuring the
printer, select “No.” The printer then returns to the
configuration menu, where you can set parameters
again.
•
The printer pauses and waits for a main menu
selection to be made (see sample printout on the
next page; short clicks are used, except when
answering “yes” or validating selection).
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22
Chapter 4: Using the Printer
+++++++++!!NBJO!NFOV!!++++++++++
+++++++++++++++++++++++++++++++
*** A798 – Diagnostics Form ***
Model number
Serial number
:
:
A798-720D-TD00
C073400014
Tfmfdu!b!tvc.nfov!;
.!FYJU
.? 2!dmjdl
.? 3!dmjdlt
.? 4!dmjdlt
.? 5!dmjdlt
.!Qsjou!Dvssfou!Dpogjhvsbujpo
.!Tfu!Dpnnvojdbujpo!Joufsgbdf
.!Tfu!Ejbhoptujdt!Npeft
.!Tfu!Fnvmbujpo0Tpguxbsf!Pqujpot .? 6!dmjdlt
.!Tfu!Ibsexbsf!Pqujpot
.!Tfu!Qbqfs!Uzqf
Boot Firmware
Revision
CRC
:
:
:
V1.00
08D3
189-7940154A
P/N
.? 7!dmjdlt
.? 8!dmjdlt
Flash Firmware
Revision
CRC
:
:
:
V1.00
D70C
189-7940155A
Foufs!dpef-!uifo!ipme!Cvuupo!EPXO
bu!mfbtu!2!tfdpoe!up!wbmjebuf
P/N
H/W parameters
Flash Memoriy Size
Flash Logos/Fonts
Flash User Storage
Flash Journal Size
SRAM Size
CPU Clock Freq.
Head setting
Pre-Heating
Print Density
Max Speed
Paper Width
Max Power
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
2 Mbytes
1152 kbytes
64 kbytes
64 kbytes
128 kbytes
50 MHz
C
Disabled
100%
150 mm/sec
80 mm
55 W
Knife
Partial Cut
Paper Low Sensor
Enabled
125 steps
Disabled
Comm. Interface
RX Buffer Size
Interface type
Parameters
Baud Rate
Data Bits
Stop Bit
Parity
Flow Control
Reception Errors
USB Driver Type
USB Packet w/Error
:
:
4096
RS232/USB
:
:
:
:
:
:
:
:
115200
8
1
NONE
DTR/DSR
Ignore
Printer Class
Reject
When the printer is con!gured for USB, this
location will show either: “USB Driver Type: Native”,
“USB Driver Type: Printer Class”, or “USB Driver:
Comm Class”.
Resident Code Pages
:
437, 850, 852, 857, 858
860, 863, 865, 866
1252, 862, 737, 874
A715 CP850 Emulation
:
Disabled
Logo(s) defined
User Char(s) defined
Journal Unused
:
:
:
YES
NO
64 kbytes
Diagnostice
:
OFF
To enter Printer Config Menu
1) Flip DIP switch #1 down
:
2) Reset the printer, while holding
the Paper Feed button down
Print test and Con!guration menu samples. Samples will vary depending on the printer model.
(Shown approximately 60% of size)
Short clicks are used in the main menu selections.
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Chapter 4: Using the Printer
23
Monochrome paper print density
This function makes it possible to adjust the energy level of the printhead to darken the printout or adjust for paper
variations. An adjustment should only be made when necessary. The factory setting is 100%.
Warning: Choose an energy level no higher than necessary to achieve a dark printout.Failure to observe this rule may
result in a printer service call or voiding of the printer warranty. Running at a higher energy level will reduce
the printhead life. Consult your TPG representative or TPG technical support if you have any questions.
When the printer prints high-density print lines (text or graphics), it automatically slows down.
To change the print density:
1 Enter the configuration menu (follow directions on page 21).
2 Select “Set Hardware Options” from the main menu.
Printer responds, “Hardware Options Menu,” and when scrolled prompts, “Set Print Density?”
3 Select “Yes”.
A warning is printed, followed by the density adjustment selections.
Enter clicks for selection, then hold button down at least 1 second to validate.
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Chapter 4: Using the Printer
When to change the receipt paper
Change the paper when it is near the end of the roll or out. When the paper is low, you will want to monitor usage to avoid
running out part way through a transaction. When the paper is out, you must load a new roll immediately or data may be
lost!
When paper is low:
•
Colored stripe appears on the receipt paper, (if paper is purchased with stripe) and indicates enough paper remains for a
small transaction.
•
If paper low option is installed on the printer, the green LED flashes slowly indicating that approximately 15 feet
of paper remains. If too much paper is left on the roll, the “paper low” setting can be adjusted by entering the
configuration menu and changing the “paper low” extension setting.
When paper is out:
Green LED flashes quickly indicating the paper must be installed.
•
Warning: Do not try to operate the printer or host computer if the printer runs out of paper. The printer may continue to
accept data from the host computer even though it is unable to print. Data may be lost as a result!
For instructions on how to change the receipt paper, look in Chapter 3: Setting up the Printer, “Load or change the receipt
paper” (see page 12).
Printhead Setting
The printhead energy rating and printer setting must match. The setting will be preconfigured from the factory but may
require changing should service to the thermal mechanism be required. The “Head Setting” on the diagnostic printout must
match the letter marked on the front right of the thermal mechanism. Whenever the thermal mechanism is replaced, if the
letter on the the mechanism is different from the head setting, you must enter the configuration menu and set the printhead
to match. (See A798 Service Guide for replacing the thermal mechanism.)
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Chapter 4: Using the Printer
25
Preventing overheating of the printhead
There are restrictions on the duty cycle because of the heat generated by the thermal printhead when printing solid blocks
(regardless of the length of the block in relation to the print line). The restrictions are ambient temperature, the percentage
of time (measured against one minute) of continuous solid printing, and the amount of coverage.
Keep in mind that the ambient temperature may be affected by factors such as direct exposure to sun or close proximity to
heating elements.
Caution: When the duty cycle exceeds the limits shown in the table, the receipt printhead will heat up and shut down. This
may damage the printhead.
To avoid this problem, do one or a combination of the following:
1 Reduce the amount of coverage.
2 Reduce the time of continuous solid printing.
3 Reduce the ambient temperature.
Allowable duty cycle (measured over one minute of continuous printing)
Amount of solid coverage
Ambient temperature
Duty cycle
25°C
100%
50%
35° C
50%
25%
10%
50° C
20%
10%
4%
Percentage of time that the speci!ed
“Amount of solid coverage”can be printed
during a one minute period of time.
20%
40%
100%
20%
Example: at 20% solid coverage,
35° C temperature, a 50% duty
cycle is to be used, resulting in
30 seconds of printing and
30 seconds without printing.
For reference:
•
•
•
•
•
A typical receipt with text (contains some blank spaces) is approximately 12% dot coverage.
A full line of text characters (every cell on the line has a character in it) is approximately 25% dot coverage.
Graphics are approximately 40% dot coverage.
Barcodes are approximately 50% dot coverage.
A solid black line is 100% dot coverage.
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Chapter 4: Using the Printer
Troubleshooting the printer
The printer is simple and generally trouble-free, however unexpected conditions may arise. Use the charts below to
diagnose and solve these printer conditions. To resolve complex issues, you may need to contact a service representative.
If unexpected conditions arise while installing the USB driver, take a look in the FAQ section under the “service and
Printer tone and green LED
Condition
Possible causes
What to do
Where to go for more information
Green LED, quick steady
"ashing
Paper out
Load a new paper roll
Chapter 3: Setting up the Printer,
“Load or change the receipt paper”
(See page 12)
Receipt cover open
Close the cover
Knife unable to home
Stop using the printer
Contact your authorized service
representative.
Green LED, slow steady
"ashing
Paper is low
(if paper low sensor is
installed)
Load a new paper roll
Chapter 3: Setting up the Printer,
“Load or change the receipt paper”
(See page 12.)
Other problems may
be indicated
Stop using the printer
No action is required
Contact your authorized service
representative
Printer beeps
Printer has been turned
(two-tone—low frequency, on and is ready to operate
high frequency)
Printer beeps and "ashes
green LED in various
combinations
These all indicate serious
conditions
Stop using the printer
Contact your authorized
service representative
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Chapter 4: Using the Printer
27
Printing issues
Condition
Possible Causes
What to Do
Where to Go
Colored stripe on
the receipt
Paper is low
Change the paper
Chapter 3: Setting up the printer,
“Load or change the receipt paper”
(See page 12)
Receipt does not come
out all the way
Paper is jammed
Paper is jammed
Paper is jammed
Open the receipt cover,
inspect the knife, and clear
any jammed paper
Printer starts to print, but
stops while the receipt is
being printed
Open the receipt cover,
inspect the knife, and clear
any jammed paper
Receipt is not cut
Open the receipt cover,
inspect the knife, and
clear any jammed paper
Print is light or spotty
Paper roll loaded
incorrectly
Check that the paper
is loaded properly
Chapter 3: Setting up the printer,
“Load or change the receipt paper”
(See page 12)
Thermal printhead is dirty
Variations in paper
Use recommended
thermal receipt paper
(See note below.)
Chapter 5: Paper and Supplies,
“Ordering thermal paper”
(See page 29)
Increase print density in
“Set Hardware Options”
of printer Con!guration
Menu to 110% or 120%
as needed
Contact your authorized service
representative or refer to Chaper 4:
Using the Printer, “Con!guring the
printer”
USE CAUTION when changing
settings (See page 20)
Vertical column of print
is missing
This indicates a serious
condition with the printer
electronics
Stop using the printer
Stop using the printer
Contact your authorized
service representative
One side of receipt is
missing
This indicates a serious
condition with the printer
electronics
Contact your authorized
service representative
Note: If paper has been used which is not on the TPG recommend paper list, resulting in a dirty printhead, the printhead
may require cleaning prior to switching back to TPG recommended paper. See Chapter 5 for a list. If non-
recommended paper is used over an extended period, attempting to clean the printhead will have little e#ect on print
quality.
Do not try to clean within the printer except as noted in the A798 Service Guide, Chapter 4: Cleaning and
Maintenance.
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Chapter 4: Using the Printer
Printer does not function
Condition
Possible Causes
What to Do
Where to Go
Printer does not function
when turned on
Printer not plugged in
Check that printer cables
are properly connected
on both ends
Chapter 3: Setting up the printer,
“Connect the cables”(See page 15)
Check that the host
or power supply is
getting power
Chapter 3: Setting up the printer,
“Connect the cables”(See page 15)
Receipt cover not
fully closed
Close and latch the
receipt cover
Printer stops functioning
Printhead has overheated Allow the printhead to
cool down
Chapter 4: Using the Printer,
“Preventing overheating of the
printhead”(See page 25.)
Interrupted data signal
over USB connection
Ensure the standard USB
cable is no more than 5
meters long, with no
extensions; eliminate hubs
Faulty USB port
Plug cable into another USB
port on host computer
Interruption of data
RS-232C mode not
working
Printer had previously
been connected to
USB host
Reset printer and check normal
RS-232C faults.
Printer goes o#-line
(red LED on USB connector connected properly
is on or o#)
USB cable is not
If printer doesn’t
Chapter 3: Setting up the Printer,
“Connect the cables”(See page 19)
auto-recover after 5–20
seconds, reconnect the
USB cable, reset the
printer, and reboot the
host computer; check that
USB cable are properly
connected on both ends
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Chapter 5: Paper and Supplies
29
Chapter 5: Paper and Supplies
Ordering from TPG
Printer parts, accessories, and small quantities of paper can be ordered directly from TPG. While the TPG part numbers are
listed here for your convenience, keep in mind that these numbers may change before this guide is outdated. To place an
order or get more non-technical information, call your TPG representative or the sales line at (800) 732-8950.
TPG is able to provide paper in small lots to facilitate product evaluation and testing. Contact your TPG representative for
more information on ordering.
Ordering thermal paper
Thermal paper speci!cations
The printer requires qualified thermal paper with the following dimensions:
Width
Diameter
Length
58 0.2 mm (2.28 0.01”)
60 0.2 mm (2.36 0.01”)
80 0.2 mm (3.15 0.01”)
82.5 0.2 mm (3.25 0.01”)
90 mm max. (3.54”)
90 mm max. (3.54”)
90 mm max. (3.54”)
90 mm max. (3.54”)
322’nominal
322’nominal
322’nominal
322’nominal
The paper must not be attached at the core. Use paper with a colored stripe at the end to indicate that the paper is running
low, required when the printer is positioned vertically.
The above figures are based on a core diameter of 22 ± 0.5 mm (0.87”) outside,11.5 ± 0.5 mm (0.45”) inside.
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Chapter 5: Paper and Supplies
Quali!ed Paper Grades
Contact the converter of your choice to order paper. TPG recommends the following paper grades produced by their
respective manufacturers. There are a number of paper converters qualified to provide this paper, provided the POS rolls
are from these recommended grades.
Monochrome (black ink) paper:
Quali!ed manufacturers
Phone
Paper grade (density)
Appleton Papers, Inc. (USA)
825 E. Wisconsin Ave.
Appleton, WI 54912
Voice: (800)922–1729
Optima T1030 (Light)
Optima T1012A (Standard)
Optima POS-Plus (Light)
Optima T2162(Light)
Optima Superior (Standard)
Optima Hi-Yield
Fax:
(800)922–1712
Kanzaki Specialty Papers (USA) Voice: (888)526–9254
P–300 (Light)
20 Cummings St.
Fax:
(413)731–8864
P–310 (Standard)
P–350 (Standard)
P–354 (Standard)
P–390 (Standard)
TO–260 (Standard)
TO–381L (Standard)
Ware, MA 01082–2002
Jujo Thermal LTD.
P.O. Box 92 FIN–27501
Kauttua, Finland
Voice: (358)2–8393–2900
Fax: (358)2–3893–2419
AF50KS–E3 (Standard)
AP62KS–E3 (Standard)
OJI Paper Company Ltd.
5–12–8 Ginza Chuo-ku
Tokyo 104, Japan
Voice: (81)3–5550–3076
Fax: (81)3–5550–2950
KF–60 (Standard)
PD–170R (Light)
PD–160R (Standard)
Koehler UK LTD. (GB)
Voice: (44)1322–661010
KT55–F20 (Standard)
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Chapter 5: Paper and Supplies
31
Ordering miscellaneous supplies
Cash drawers
Order cash drawers from the following suppliers:
Cash Drawers
Number
NCR
7052-K657TM
M-S Cash Drawer Corp.
APG Cash Drawer
Indiana Cash Drawer
EP-125 K seriesTM, EP-127TM, EP-102TM
Model 322TM
Model SLDTM
Power supply and power cords
Other suppliers may use different part numbers.
Item
Type
Number
55-Watt power supply with attached
cable to printer and U.S. power
supply cord
A798-K330
75-Watt power supply with attached
cable to the printer and U.S. power
supply cord
A798-K331
55-Watt power supply, attached cable
75-Watt power supply, attached cable
Power supply cord (to outlet)
A798-K301
A798-K302
United States
A798-K320
A798-K321
A798-K322
A798-K323
A798-K324
A798-K326
International (no plug)
United Kingdom
S.E.V.
Australia
International (with plug)
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Chapter 5: Paper and Supplies
Wall-mount kits
Power supply wall-mount kit: A798-K309
Documentation and utilities
Contact a sales representative to order the following:
A798 User Guide*
A798–UG00001
A798–PG00001
A798–SG00001
A798 Programming Guide*
A798 Service Guide
(TPG certi!ed service technicians only)
A798 Setup Guide*
A798–SUG00001
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