ПЂ H-2550
ZEBRA GK420D
DIRECT THERMAL
PRINTER
1-800-295-5510
uline.com
PARTS
NOTE: Save the carton and all packing materials
for storage or in case the printer needs to be
returned to the manufacturer.
Documentation
and Software
Cleaning Pen
Printer
Power Cord
Power Supply
EXTERNAL PARTS DIAGRAM
Status Light
Feed Button
Release
Latch
Fan-Fold
Media
Entry Slot
Power
Switch
Release
Latch
PAGE 1 OF 7
Interface
Connectors
DC Power
Receptacle
0114 IH-2550
INTERNAL PARTS DIAGRAM
Printhead
Gap
Sensor
Roll Holder and
Media Guides
Black-Line
Sensor
DISPENSER OPTION
Platen
Roller
Head-Up Sensor
(inside)
Dispenser Door
(open)
Sensor
PAGE 2 OF 7
Pinch Roller
Peel Bar
0114 IH-2550
CHECKING THE PRINTER
NOTE: Save the carton and all packing materials
for storage or in case the printer needs to be
returned to the manufacturer.
Figure 1
1. Check all exterior surfaces for damage.
CAUTION! The discharge of the electrostatic
energy that accumulates on the surface of the
human body or other surfaces can damage or
destroy the print head or electronic components
in the printer. Observe static-safe procedures
when working with the internal components of
the printer.
2. Open the printer by pulling the release laches and
lifting the cover. (See Figure 1)
3. Inspect the media compartment for damage to
components.
CONNECTING TO POWER
CAUTION! Never operate the printer and power
supply in an area where they can get wet.
Serious personal injury could result.
1. Make sure the power switch is turned off.
Ensure a three prong plug and an IEC 60320-C13
connector are used at all times. This power cord
must bear the relevant certification mark of the
country in which the product is being used.
3. Insert the AC power cord into the power supply.
2. Insert the power connector into the power receptacle.
4. Plug the other end of the power cord into an AC
electrical outlet. The active power light will turn on.
(See Figure 2)
Figure 2
Printer
Power
Switch
AC
Power
Cord
Power
Connector
Power
Supply
Power
Receptacle
Active Power Light
PAGE 3 OF 7
IEC 60320
C-13
0114 IH-2550
LOADING MEDIA ROLL
1. Open the printer and pull the media guides away
from each other. (See Figure 3)
Figure 3
2. Place the media roll on the roll holders and release
the media guides.
3. Position the media roll so print side faces up as it
passes over the platen roller. (See Figure 3)
4. Pull the end of the media roll so it extends out of the
front of the printer. Ensure the roll turns freely.
(See Figure 4)
Figure 4
NOTE: The media roll should be supported by
the media guides and should not sit in the
bottom of the media compartment.
5. Push the media roll under the media guides.
(See Figure 5)
Figure 5
6. Close the printer. Press down until the cover snaps
closed.
PAGE 4 OF 7
0114 IH-2550
OPERATING CONTROLS
POWER SWITCH
FEED BUTTON
• Press up to turn the printer ON or down to turn the printer OFF.
CAUTION! Power should be turned off before
connecting or disconnecting the communications
and power cables.
STATUS LIGHT
• The status light functions as a printer operational indicator.
• Press the feed button once to force the printer to feed one
blank label.
• Press the feed button to take the printer out of a pause
condition. The printer is put into pause by either a
programming command or an error.
• Press the feed button for printer setup and status.
CONFIGURING PRINTER
ADJUSTING THE PRINT WIDTH
ADJUSTING PRINT QUALITY
Print width must be set when:
Print quality is influenced by the heat or density setting of the
printhead, the print speed, and the type of media in use.
Experiment with different settings to find optimal mix for
application.
• The printer is being used for the first time.
• There is a change in media width.
Print width may be set by:
Relative darkness (or density) setting can be controlled by:
• Windows printer driver or application software such as
Zebra Designer.
• Controlling printer operations with ZPL programming; refer to
the print width (^PW) command.
• Controlling printer operations with EPL Page Mode
programming; refer to the Set Label Width (q) command.
• The Set Darkness (~SD) ZPL command.
• The Density (D) EPL command.
To adjust printer speed use:
• Windows printer driver or application such as Zebra
Designer.
• The Print Rate (^PR) command.
• The Speed Select (S) command.
PRINTING A TEST LABEL
Figure 6
NOTE: Before you connect the printer to your
computer, make sure the printer is in proper
working order.
PRINT A CONFIGURATION LABEL
1. Make sure the media roll is properly loaded and
the top cover of the printer is closed. Then, turn the
printer power on.
NOTE: If the printer initializes with the status
light blinking green (pause mode), press the
feed button once to set the printer in ready
mode.
2. Press the feed button two to three times to allow
the printer to calibrate for the installed media. The
printer may feed several labels during this process.
3. When the status light is solid green, press and hold
the feed button until the status light flashes once.
4. Release the feed button. A configuration label will
print. (See Figure 6)
PAGE 5 OF 7
0114 IH-2550
CLEANING PRINTER
NOTE: Adhesives and media material over time can
transfer onto the printer components, including the platen
and printhead. This build-up can accumulate dust and
debris. Failure to clean the printhead, media path and
platen roller could result in inadvertent loss of labels, label
jams and damage.
NOTE: Using too much alcohol can result in contamination
of the electronic components requiring a longer drying
time before the printer will function properly.
When cleaning the printer, use one of the following supplies:
CLEANING SUPPLIES
QUANTITY
PURPOSE
Cleaning Pens
(105950-035)
12
Clean Printhead
Cleaning Swabs
(105909-057)
25
Clean media path,
guides and sensors
To clean the printhead:
• Let the printhead cool for a minute, then use a new cleaning
pen to swab the dark line on the printhead. Clean from the
center to the outside edges of the printhead.
• Repeat after every roll of media.
To clean the platen roller:
• Remove the platen roller, then clean the roller thoroughly
with 90% medical-grade alcohol and a cleaning swab or
lint-free cloth.
• Repeat as needed.
To clean the Peel bar:
• Clean thoroughly with 90% medical-grade alcohol and a
cleaning swab or lint-free cloth.
• Repeat as needed.
To clean the media path:
• Clean thoroughly with 90% medical-grade alcohol and a
fiber-free cleaning swab.
• Repeat as needed.
To clean the Exterior:
• Wipe with a water-dampened cloth.
• Repeat as needed.
To clean the Interior:
• Gently brush out printer.
• Repeat as needed.
TROUBLESHOOTING
LED STATUS AND COLOR
PRINTER STATUS
RESOLUTION
OFF
OFF
The printer is not receiving power:
• Turn off the power.
• Check power connection from the outlet to the power supply, and from the
power supply to the printer.
• Disconnect the printer from the outlet for 30 seconds and then reconnect.
Solid Green
On
The printer is on and in an idle state:
• No action necessary.
The printer has failed its power on self test (POST)
• If this error occurs right after power is turned on, contact an authorized reseller
for assistance.
• When the printer is operating normally, the printer status light will be amber for
about 10 seconds before turning green (solid or blinking).
There is a memory error:
• Turn power off and on, and then resume printing.
Solid Amber
Stopped
Flashing Green
Normal Operation
The printer is receiving data:
• As soon as all data has been received, the status LED will turn green and the
printer will automatically resume operation.
Flashing Red
Stopped
The media is out:
• Follow the instruction for loading the media roll, page 4, and then press the
feed button to resume printing.
The printhead is open:
• Close the top cover and press the feed button to resume printing.
Double Flashing Green
Paused
The printer is paused:
• Press the feed button to resume printing.
Flashing Amber
Paused
The printhead is over temperature:
• Printing will stop until the printhead cools to an acceptable temperature.
• The printer will automatically resume operation.
Alternately Flashing
Green and Red
Needs Service
FLASH memory is not programmed:
• Return the printer to an authorized reseller.
Flashing Red, Red and Green
Needs Service
Printhead or motor has had a critical failure:
• Return the printer to an authorized reseller.
PAGE 6 OF 7
0114 IH-2550
TROUBLESHOOTING CONTINUED
PRINT QUALITY PROBLEMS
No print on the label
The printed image
does not look right
RESOLUTION
The media may not be direct thermal media:
• Check that the correct media is loaded.
The media is loaded incorrectly:
• Reload the media, see page 4.
The printhead is dirty:
• Clean printhead, see page 6.
The printhead is under temperature:
• Wait for printhead to come up to temperature before using.
The print quality or print speed needs adjusting:
• Adjust print darkness or speed, see page 5.
The media is incompatible with the printer:
• Direct thermal should be used.
The printhead is worn out:
• Replace the printhead.
The platen roller may need cleaning or replacement:
• Check the platen roller for debris.
• Clean the platen roller if necessary, see page 6.
The platen roller may be losing traction:
• Check platen roller for foreign objects attached to its surface.
• Check the surface of the platen roller; if polished or slippery, replace the platen roller.
• Check the surface of the platen roller; if there is damage such as box knife cuts,
replace the platen roller.
π CHICAGO • ATLANTA • DALLAS • LOS ANGELES • MINNEAPOLIS • NYC/PHILA • SEATTLE • MEXICO • CANADA
1-800-295-5510
PAGE 7 OF 7
uline.com
0114 IH-2550
