Postek G-2108 User manual

G-2108/G-3106 User’s Manual
i
FCC Notice
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this
device may not cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
This equipment may generate, use and/or radiate radio frequency energy. If not installed and used in full accordance
with this instruction manual, interference to radio communications may occur. This equipment complies with the limits
for a Class A Information Technology Equipment pursuant to Part 15 of the FCC Rules, which are designed to provide
reasonable protection against such interference when operated in a commercial environment. Operation of this
equipment in a residential area may also cause interference. In such case the user will be required, at own expense, to
correct the interference using whatever means necessary.
Trademarks
ARM is a registered trademark of Advanced RISC Machines Ltd.
Centronics is a registered trademark of Centronics Data Computer Corporation.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
POSTEK is a registered trademark of Postek Electronics Co., Ltd.
Copyright
© 2013-2023 by Postek Electronics Co., Ltd. All rights reserved. Under the copyright laws, this manual cannot be
reproduced in any form without the prior written permission of Postek. No patent liability is assumed, with respect to
the use of the information contained herein.
G-2108/G-3106 Barcode Label Printer User’s Manual
18th edition July 2017
Disclaimer
POSTEK barcode/RFID printers are developed and manufactured by Postek Electronics Co., Ltd (hereinafter as
“POSTEK”) with the adoption of direct thermal/thermal transfer printing and RFID encoding techniques. For thermal
transfer printing, matching ribbons and media are required. Meanwhile, the wide variety of RFID chip and antenna
designs make it difficult to guarantee RFID tag’s 100% compatibility with POSTEK printers, to satisfy your printing
needs, please consult with the local reseller(s) to choose the matching consumables for POSTEK printers.
This manual has been validated and reviewed for accuracy. The instructions and descriptions it contains are accurate
for the POSTEK printer at the time of this manual’s distribution. However, succeeding printers and manuals are subject
to change without notice. POSTEK assumes no liability for damages incurred directly or indirectly from errors,
omissions or discrepancies between the printer and this manual.
To protect your interest, and to prevent loss due to improper handling, please read the corresponding user’s manual
before operation, and don't use the printer during abnormal conditions. In no event shall POSTEK be liable for any
damage or loss caused by human misoperation, including but not limited to loss of business profits, business
interruption, loss of business information, or other pecuniary loss.
Although this manual describes and details many issues which could possibly occur, the manufacturer cannot warrant
against unpredictable conditions during the printer’s application. For problems such as the printer not working, missed
or unclear print content, etc., POSTEK and/or its resellers are responsible for troubleshooting (according to POSTEK
Warranty Clauses). In no event shall POSTEK be liable for any direct or indirect loss, including but not limited to loss
of business profits, business interruption, loss of business information, or other pecuniary loss.

G-2108/G-3106 User’s Manual
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Important Safety Instructions
Only qualified and trained service technicians should attempt to repair the printer.
Do not place the printer on or near a heat source.
Be sure that the output of the power adapter is 24VDC and your power source matches the rating listed on the
power adapter. Be certain your power source is grounded.
To avoid getting an electric shock, do not use a worn or damaged power cord. If the power cord becomes damaged
or frayed, replace it immediately.
Do not insert anything into the ventilation slots or openings on the printer.
The printer and power adapter should never be operated in a location where either one can get wet. Personal injury
may result.
The printhead becomes hot while printing. To protect from damaging the printhead and risk of personal injury,
avoid touching the printhead.
To get increased printhead longevity and higher quality printouts, always use approved labels, tags and thermal
transfer ribbons. Approved supplies can be ordered from your Postek authorized reseller.
Static electricity that accumulates on the surface of the human body or other surfaces can damage or destroy the
printhead or electronic components in this device. DO NOT touch the printhead or the electronic components with
bare hands.
Place the printer on a flat, firm, solid surface.
Never jam or block the air vents, or operate in a high temperature environment.
Turn off the power when not in use for extended periods.
Follow all recommendations and setup instructions included in this manual.
Warnings
This is a Class A product. In a domestic environment this product may cause radio interference in which case the user
may be required to take adequate measures (see FCC Notice).
Static electricity that accumulates on the surface of the human body or other objects can damage the print head or
electronic components in the G-2108/G-3106 printer. Observe proper electrostatic safety precautions when handling.

G-2108/G-3106 User’s Manual Contents
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Contents
Preface ...............................................................................................................................................................1
Important Notice, Read Me First....................................................................................................................2
Chapter 1: Introduction...................................................................................................................................3
Printer Specifications..........................................................................................................................................................3
Specifications for PowerAdapter ...............................................................................................................................4
Contents of Box..................................................................................................................................................................4
Chapter 2: Setup and Use ................................................................................................................................6
Setting up the Printer..........................................................................................................................................................6
Main Parts and Structures...................................................................................................................................................6
Connecting the Printer........................................................................................................................................................9
Interface Connection...................................................................................................................................................9
Loading the Ribbon ..........................................................................................................................................................10
Loading the Media............................................................................................................................................................17
Standard Mode..........................................................................................................................................................17
Peel-off Mode:..........................................................................................................................................................22
Cutting Mode............................................................................................................................................................22
Adjusting the Position of Media Sensor...........................................................................................................................24
Chapter 3: Operations and Settings..............................................................................................................26
Basic Operations...............................................................................................................................................................26
Power Switch............................................................................................................................................................26
The Front Panel.........................................................................................................................................................26
LED Indicator...........................................................................................................................................................26
Advanced Functions .................................................................................................................................................27
Windows Driver and Label Software................................................................................................................................30
Chapter 4: Maintenance ................................................................................................................................31
Cleaning the Printhead......................................................................................................................................................31
Cleaning the Platen Roller................................................................................................................................................32
Cleaning the Printer Interior .............................................................................................................................................32
Chapter 5: Troubleshooting...........................................................................................................................33
Error Indications...............................................................................................................................................................33
Miscellaneous...................................................................................................................................................................34
Vertical Blank Lines Appear.....................................................................................................................................34
Printer Timeout Error Message.................................................................................................................................34
Data Sent but Not Printing........................................................................................................................................34
Poor Printing Quality................................................................................................................................................35
Recovery...................................................................................................................................................................35
Appendix A: Interface Specifications ...........................................................................................................36
Appendix B: ASCII Table..............................................................................................................................38

G-2108/G-3106 User’s Manual Preface
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Preface
The G-2108/G-3106 Light Industrial printer is designed to provide general-purpose and high-performance printing
capabilities. Boasting multiple, user-friendly functions and high performance, the G-2108/G-3106 printer stands out
with its modern appearance and excellent functionality. Carefully designed G-2108/G-3106 units are rugged, durable
and easily operated and maintained. The 32-bit embedded ARM CPU and high-tech system platform delivers the
highest quality possible.
This manual explains how to set up and begin using your G-2108/G-3106 printer. It also provides detailed information
on configuring your printer, basic operations, care and troubleshooting.
Please read this manual carefully before using the G-2108/G-3106 printer.

G-2108/G-3106 User’s Manual Important Notice
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Important Notice, Read Me First
The thermal printhead can be easily damaged due to its precision construction. A printhead damaged by misuse is not
covered under the terms of the warranty. To ensure longevity of the printhead, please note the following:
1. DO NOT scrape or use tools that might damage the printhead surface.
2. To protect from corroding the printhead, DO NOT touch the printhead with bare hands.
3. DO NOT use thermal paper or thermal transfer ribbons which contain Na, K or Cl.
4. Keep printhead from any form of liquid or dampness.
5. Only use a cotton swab dipped in anhydrous isopropyl alcohol to clean the printhead.
6. Always use high-quality consumables:
When the printhead module is closed, pressure is placed directly onto the printhead; dirt such as paper scraps,
sand, dust and glue can scrape or damage the printhead.
The TPH is also easily damaged by static electricity, which may be generated by poor quality ribbons.
7. Always inspect consumables for high quality before purchasing.

G-2108/G-3106 User’s Manual Chapter 1: Introduction
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Chapter 1: Introduction
Printer Specifications
Model
G-2108
G-3106
Printing Method
Direct Thermal & Thermal Transfer
Printing Resolution
203 dpi (8 dots/mm)
300 dpi (11.8 dots/mm)
Max Printing Speed
6ips (152.4 mm/s)
4ips (101.6 mm/s)
Max Printing Width
4.25″ (108 mm)
4.17″ (106 mm)
Max Printing Length
315″ (8000 mm)
157″ (4000 mm)
Memory
8 MB FLASH ROM, 16 MB SDRAM
Media
Roll-feed, die-cut, continuous, fan-fold, tags, tickets in plain paper or thermal paper
Width: 4.3″ (110 mm) max., 0.98″ (25 mm) min., or with optional adapter .31″ (8 mm)
min.
Supply roll: OD 6″ (152 mm) max., ID 1″ (25.4 mm) min.
Thickness: 0.003″～0.008″ (0.08～0.20 mm), including liner
Ribbon
Wax, Wax/Resin, Resin
Ribbon roll: OD 2.75″ (70 mm) max., ID 1″ (25.4 mm) core
Max width: 4.3″ (110 mm); Max length: 984.25’(300 m). Ink side: Out
Fonts
Five built-inASCII fonts; Optional multiple language fonts
Bar Code Types
1D Barcode: Code 39, Code 93, Code 128/subset A,B,C, Codabar, Interleave 2 of 5, UPC
A/E 2 and 5 add-on, EAN-13/8/128, UCC-128.
2D Barcode : MaxiCode, PDF417, Data Matrix, QR.
Media Sensor
Reflective (Adjustable) / Transmissive
Interfaces
RS-232 Serial, USB 2.0, 10/100M Ethernet.
Power Rating
24 VDC, 2.5 A
Weight
7.72lbs (3.5 kgs)
Dimensions
W 10.07” x D 12.95” x H 7.8” (W 256 x D 329 x H 200 mm)
Operation Environment
Temperature: 32F ~ +104F (0C ~ 40C)
Relative humidity: 5% - 85% non condensing
Storage Environment
Temperature: -40F ~ +140F (-40C ~ 60C)
Relative humidity: 5% - 85% non condensing
Optional Items
External Rewinder, External Media Stand, Rotary Cutter, Media Guide Adapter, and
Centronics Parallel.

G-2108/G-3106 User’s Manual Chapter 1: Introduction
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Specifications for PowerAdapter
Input
AC 100~240 V, 47~63 Hz
Output
DC 24 V, 2.5 A
Environment
0C ~ 40C
Contents of Box
Inspect the shipping carton(s) for possible shipping damage, if damage is discovered, notify the shipping company to
report the nature and extent of the damage.
Please check the items according to the Packing List. If there are any items missing, notify your authorized reseller.
Packing List (see Figure 1)
G-2108/G-3106 Printer
1 pc
Power Adapter
1 pc
USB interface cable
1 pc
Media Spindle
1 pc
Media Roll Guides
2 pcs
Media Core Adapter
2 pcs
Ribbon Spindle
2 pcs
Quick Start Guide
1 pc
*CD-ROM pack
1 pc
*Note: CD-ROM pack includes the printer driver, label software, User’s Manual and the Programming Manual.

G-2108/G-3106 User’s Manual Chapter 1: Introduction
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Figure 1: Printer and Accessories
Ribbon Spindles
G-2108/G-3106
Printer
Power Adapter
Media Spindle
Media Core Adapters
Media Roll Guides
USB Cable
CD-ROM
Quick Start Guide

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Chapter 2: Setup and Use
Setting up the Printer
Before setting up the printer consider the following:
1. Make sure there is adequate space around the printer for loading consumables and proper ventilation.
2. Make sure the printer is close to the host so the interface cable is easily accessible at either end.
Main Parts and Structures
Figure 2
1. PAUSE Button
5. MEDIA Indicator
9. Bottom Case
2. FEED Button
6. RIBBON Indicator
10. Top Cover
3. CANCEL Button
7. Media Exit Path
11. Left Side Cover
4. READY Indicator
8. Cover Handle
3
1
2
4
5
6
8
7
11
10
9

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Figure 3
1. Printhead Module
5. Reflective Sensor
9. Ribbon Supply Spindle
2. Printhead Bracket
6. TPH Release Lever
10. Media loading area
3. Printhead
7. Media Guide
11. Ribbon Adjusting Wheel
4. Transmissive Sensor
8. Ribbon Loading Knob
12. Platen Roller
2
1
3
4
12
6
7
8
9
10
11
5

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Figure 4
1. RS232 Serial Port
4. DC IN Port
2. USB Device Port
5. Centronics Parallel Port (Optional)
3. Ethernet Port
1
2
3
4
5

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Connecting the Printer
Warnings:
(1) Do not use the printer near liquids or corrosive chemicals.
(2) Using the wrong power adapter may cause damage to your printer. Postek assumes no liability for any damage
in such cases. The power rating for the printer is 24VDC.
1. Make sure the printer is switched OFF.
2. Connect the power cord to the Power Adapter.
3. Connect the Power Adapter’s DC output plug to the DC IN port on the back of the printer.
4. Plug the power cord into a live wall outlet.
Interface Connection
The G-2108/G-3106 supports RS-232 Serial, USB Device, Ethernet and Centronics parallel connections.
Centronics parallel connection requires an optional Centronics parallel Interface Card.
Note: When connecting the G-2108/G-3106 printer to a computer via the USB interface cable, make sure to utilize
the same USB port used during the driver installation process, which enables the printer to retrieve needed
commands or data from the PC. If the same USB port is not available or not known, then in the printer’s Properties
Dialogue Box, under the Ports tab, ensure the current port location is checked.
To connect:
1. Make sure the printer is powered OFF.
2. The printer will identify the communication port automatically.
3. The default values of printer port can be obtained from the self-test report. (See Chapter 2: Operation Basics/
Advanced Functions/ Self Test)
4. Cable configurations for Serial (RS-232C) interface and parallel (Centronics) is found in Appendix A of this
guide.
5. Please take the following measures to reduce cable noise.
-Restrict the length of the interface cable to less than 6’ (1.83 M) if possible.
-Keep the interface cable separate from power cords.

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Loading the Ribbon
Warnings:
(1) Load ribbon only when using the thermal transfer printing method. Remove any ribbon that may be loaded
when using the direct thermal printing method.
(2) When using a ribbon roll with a width less than 110 m, please place the ribbon roll in the middle of the Ribbon
Spindle corresponding to the symmetry symbol (→|←).
To install the ribbon:
1. Lift the top cover and push down the Printhead Release Lever to release the Printhead Module (see Figure
5-1).
2. Lift the Printhead Module to expose the ribbon supply spindle (see Figure 5-2).
3. Unwrap the ribbon pack and separate the ribbon roll and the core.
4. Slide the ribbon onto one of the Ribbon Spindles and place the core onto the other spindle (see Figure 5-3).
5. Load the Ribbon Spindle into the printer and route the ribbon through the Printhead Module (see Figure 5-4).
6. Wrap the end of the ribbon around the core (see Figure 5-5).
7. Load the core into the Ribbon take up area (see Figure 5-6).
8. Turn the guide wheel on the left side of the core to ensure the ribbon is tight and smooth.
9. Close the Printhead Module and press down until it locks into place.

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Figure 5-1

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Figure 5-2

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Figure 5-3

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Figure 5-4

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Figure 5-5

G-2108/G-3106 User’s Manual Chapter 2: Setup and Use
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Figure 5-6