Extech Instruments S3750THS User manual

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S
S3 37 75 50 0T TH HS S
U
US SE ER R
G
GU UI ID DE E
VERSION: 1.5 DATE: March 16, 2005

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Table of Contents
Getting Started:
Declaration of Conformity 3
General Precautions 4
Safety Note 4
1.1 Unpacking the printer 5
1.2 Installing and Charging the Battery 5
1.3 Reading the LED Status 7
1.4 Attaching Belt Loop System 8
Loading Supplies:
2.1 Adding Paper/Labels 8
2.2 Tearing Paper Supply 9
Using the Printer:
3.1 Initial power up and self-test 10
3.2 Connecting the Printer 11
3.3 Communications: Serial RS232C 13
3.4 Communications: IrDA 14
3.5 Communications: Bluetooth 14
3.6 Using the Magnetic Card Reader 14
3.7 Programming information 15
Printer Maintenance
4.1 Cleaning 18
4.2 Charging the Printer Battery 18
4.3 Verifying Battery Charge State 19
4.4 Battery and Safety Information 19
4.5 Recycling your Batteries 20
4.6 Trouble Shooting 20
4.7 Printer Supplies 21
Specifications:
5.1 Printer Specifications 22
5.2 Supply Specifications 22
5.3 Regulatory Notes 23

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Provisional Declaration of Conformity
Name: Extech Instruments Corporation
Manufacturer’s Address 285 Bear Hill Road, Waltham, MA 02451, USA
Telephone: [phone]
Declares that the Product
Product Name: Portable Receipt Printer
Model Number: S3750THS;
Optionally Containing: 1)Bluetooth™ radio short range OEM module from
connectBlue ab, cB-0701-01; FCC ID PVH 070101.
Conforms to R&TTE Directives: 1999/5/EC (EN 300 328-
2), EMC Directive 89/336/EEC (EN 301 489-1 and -17); and
Low Voltage Directive 73/23/EEC (EN 61131-2)
3)802.11 Wi-Fi Module
Conforms to the following
regulation and/or standards:
FCC: Part 15 Subpart B, Class B
CE: EN60950
CE: EN55022 Class B;
CE: EN61000-3-2;
CE: EN61000-3-3 ;
CE: EN50024.
Supplementary Information : •The product complies with EMC Directive
89/336/EEC and Low Voltage Directive
73/23/EEC
•The product conforms to ANSI/UL STD 60950 &
Certified to CAN/CSA STD C22.2 No. 60950-00
•CB Certified
•ETL Listed, control # 3046813
•The product is IEC 68 certified
Place: Waltham, MA, USA
Date:
Signature:
Antony Revis, General Manager

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General Precautions
•Before using this product be sure to read through this manual. After reading please
keep the manual in a safe place for future reference.
•The information contained herein is subject to change without notice of any type.
•Extech is not responsible for any operational results regardless of missing
information, errors or any misprinting in this manual.
•Extech is not responsible for problems created as a result of using options and
consumables not approved by them.
•This product is designed for servicing at an Authorized Service Center. Other than
routine maintenance described in this manual the user should not attempt to repair,
service or disassemble this product.
•Incorrect operation, handling or improper operating environments may cause
damage or otherwise affect the proper operation of this product. Such actions
invalidate the product warranty.
Safety
In this manual and on the Printer and accessories we make use of
internationally recognized safety symbols as follows:
!Caution! Refer to the explanation in this Manual
Caution! Risk of electric shock
Double Insulation or Reinforced insulation
DC, Direct Current or Voltage
AC+DC, Current or Voltage

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1. Getting Started
1.1 Unpacking the Printer:
The S3750THS portable printer is a full featured portable receipt printer designed
for varied job environments including field service, field sales, hospitality and
restaurants, ticketing and many others where point of service receipts are required.
The package contains:
printer:
battery cartridge,
AC input, DC output wall mounted charger (may be USA, European or UK
style plug) for charging the battery inside the printer
Belt loop system and
Roll of paper supply (already loaded in the printer).
Both cabled and wireless communication is possible.
1.2 Installing and Charging the Battery Cartridge:
Note: One battery cartridge is included with the printer. Similar to a
cordless phone battery, the printer’s battery must be charged before using
it.
!
Extech batteries must be cycled several times to achieve maximum
capacity. To cycle a battery fully charge it and then allow full
discharge through normal use in the printer.
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1. .2 2. .1 1: : I In ns st ta al ll li in ng g t th he e b ba at tt te er ry y
Note: Refer to Figure 1 below to install the battery pack in the
printer.
Unlock the battery door by sliding the battery door locking tab down
Open the battery door
Insert the battery as shown. The battery side with two contact terminals should be
facing down to make contact with the two spring probes inside the battery
compartment.
Close the battery door.
Lock the battery door by sliding the battery door locking tab up

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Fi ig gu ur re e 1 1: : I In ns st ta al ll li in ng g t th he e B Ba at tt te er ry y C Ca ar rt tr ri id dg ge e
1
1. .2 2. .2 2
C Ch ha ar rg gi in ng g t th he e B Ba at tt te er ry y
Charge the battery by inserting the wall mounted charger line cord into the
printer jack. Then insert the charger plug into an appropriate wall socket.
The Yellow/Amber charging LED will illuminate indicating that the battery is
being charged
The battery will be fast charged and after about 180 minutes the LED will go
off
To remove the battery cartridge, open the battery door and tip the battery
out of the printer.
Note: To ensure a full charge do not operate the printer while charging.
Note: The wall mounted charger is a Class II equipment ( ) . Multiple
plug configurations comply with most international standards.
S3750THS
Input Voltage/Current 100-240 VAC/0.5A
Input Frequency 47-63 Hz
Output Voltage/Current
()10VDC/1.4A
Note: The wall mounted charger is not supplied with
plugs for use in Korea.
!
Do not use a charger not approved by Extech for use with the
S3750THS. Use of an unapproved charger could damage the battery
pack or the printer and will void the warranty.

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!
The battery terminals are well recessed inside the printer. Do not
allow them to contact conductive material since this may create a
short circuit which could cause injury or start a fire.
!
When using the wall mounted charger ensure the socket outlet is close
to the printer and easily accessible during the battery recharging
process. Either switch the socket off (if supplied with a socket switch)
or pull out the charger from the socket or disconnect the plug from the
printer in the event of any problems.
1.3 Reading the LED Status:
This table explains the LED indicator status. Refer to Figure 1 for the locations
described for ON/OFF and FEED pushbutton switches and AC adaptor socket.
LED Indicator State Status
ON – PURPLE OR
ORANGE
LOW POWER MODE ( If in
BT/80.11b mode the LED is purple ,
If in RS 232 mode the LED Is
orange)
ON - GREEN
If the LED’s Color is Green it
indicates that Power is ON and that
the printer is in RS232 or IrDA
mode
LED # 1
ON - BLUE
If the LED’s Color is Blue it
indicates that Power is ON and that
the printer is in Bluetooth or
802.11b mode
LED # 2 ON - YELLOW The battery charger is charging the
battery at a fast rate. If the battery
is below 5V, the battery is being
“trickle” charged until the battery
voltage reaches 5V, and then the
fast charge rate is started. The LED
will turn off when the battery is
fully charged.
ON -GREEN Indicates that MCR is ready to
accept data.
Indicates that SCR is ready to
accept data.
LED # 3
ON - RED Indicates a fault condition or a
printer error. The printer is not
ready to accept data.
Printer is out-of-paper
Note: Refer to the troubleshooting
guide to determine error or fault
condition.
Table 1 - Reading the LED Status

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1.4 Attaching Belt Loop System:
The belt loop system consists of two parts:
A knob located on the back part of the printer just above the battery door
A strap with click on connector
To attach the strap to the knob insert the knob located at the bottom of the printer
into the slot of the connector. Pull down until you hear a click. The printer is now
secure. The loop is then placed over your belt. Allow the printer to hang down to
either the left or right hip.
To release the printer, press in on the two latches on the connector and pull
the knob clear of the slot.
Note: Do not force or pull the printer from the connector without pressing
in on the two latches
2. Loading Supplies
2.1 Adding Paper/Labels:
The printer can print text, bar codes and graphics on thermal receipt paper. See
“Supply Specifications” for the width, thickness requirements and approved
vendors. Follow these steps to load printer paper.
Open the paper supply cover by placing your fingers under the “T” pull lever
and pulling up firmly on the supply cover until the lever stops moving.
DO NOT pull too hard. Use enough force to allow the cover to unlock and
lift freely
DO NOT force the “T” pull lever too far back
Place the paper supply roll into the paper supply well. Make sure the paper
supply unwinds from the bottom as shown in Figure 3
Position the paper supply between the print head guides
Make sure some supply (2-3 inches) extends beyond the top of the paper
supply well
Close the paper supply cover and press close.

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Fi ig gu ur re e 3 3: : O Op pe er ra at to or r C Co on nt tr ro ol ls s a an nd d P Pa ap pe er r L Lo oa ad di in ng g
2.2 Tearing Paper:
The printer’s paper door acts as a tear bar. Pull one edge of the paper against the
tear bar as indicated, then tear down and across against the tear bar to tear the
paper. !Caution: The tear bar may have sharp edges.
Using the tear bar is the only way to tear the paper.
Pulling up and pulling sideways without using the tear bar can cause a
paper jam due to paper misalignment in the print head mechanism.
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Fi ig gu ur re e 3 3A A: : T Te ea ar ri in ng g P Pa ap pe er r

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3. Using the Printer
3.1 Initial power up and self-test
Once the Battery is charged and the paper is loaded perform a self-test:
Press the <On/Off> switch once. This turns printer on. LED #1 illuminates in
green or blue depending on the mode of communication.
The printer will stay ON until it is manually tuned OFF .
If the printer is set for infrared communications (IrDA) mode the
printer will stay on all the time. Pressing the <On/Off> switch again
will turn the printer off.
Press the <On/Off> switch to turn the printer off. The LED turns off.
To start the self-test, press and hold the <FEED> switch then press the
<On/Off> switch
The printer starts to print the self-test message. Release the <FEED> switch.
Press the <On/Off> or <FEED> switch to cancel the self-test print.
The first few lines of self-test show the printer firmware version,
the current printer settings (for example IrDA or Serial mode) and
a list of any optional or special features installed.
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Fi ig gu ur re e 5 5 – – S Sa am mp pl le e S Se el lf f T Te es st t

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3.2 Connecting the Printer
The S3750THS printer supports Serial RS232 and IrDA compatible infrared
communication interfaces. Radio frequency (RF) communication is also
available as an optional feature as well as 802.11b interface.
Serial, IrDA, 802.11b and Bluetooth communication settings can be changed
via a DIP switch located on the control card.
The DIP switch is located inside the battery compartment as illustrated below
indicating the location of this switch. Figure 2 shows the DIP switch selection.
The functions assigned to these switches are shown in Table 2.
If the Serial interface is selected, the communication Parameters, Baud rate,
Data Bit and Parity, must be set. These parameters apply both for UART 1
and UART 2.
Note: Optional serial cable is available for Serial RS232
communication (part # 5892RJD9).
Printer drivers for Windows 95/98/NT/2000 and XP are available from
Extech.
PrinterCE print Control utility is available from Extech for Windows CE
devices.
Printboy Print Utility from Bachmann Software or PalmPrint Utility, from
StevensCreek, are recommended for Palm Pilot devices
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Fi ig gu ur re e 2 2: : D Di ip p S Sw wi it tc ch h L Lo oc ca at ti io on n

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3. .2 2. .2 2 S Se et tt ti in ng g D Di ip p S Sw wi it tc ch he es s
Note: Be careful when changing dip switch settings. Carefully use a
pointer on the dip switch you are going to change. DO NOT use a screw
driver or apply excessive force.
3
3. .2 2. .3 3 D Di ip p S Sw wi it tc ch h F Fu un nc ct ti io on ns s
Note:(Developer’s refer to Programming Manual for more information)
Table 2 – DIP Switch Setting
Please note: In order for changes to the dip switch configuration to take
effect, the printer power must be reset.
Dip Switch Function Switch Switch Switch Switch Notes
1,2,3,6 Communication Interface SW1 SW2 SW3 SW6
RS 232 Off Off Off Also set 4&5
IrDA On On Off Also set 4&5
802.11b Off On On 38,400 baud
BT Off On On 38,400 baud
IR Direct Mode On On Off On 9600 Baud
4 & 5 COM 1 & 2 - Baud Rate SW4 SW5 RS232 rate
38,400 Off Off BT & 802
19,200 Off On
9,600 On Off
2,400 On On
4 & 5 COM 2 – IrDA Baud Rate SW4 SW5 IrDA BAUD rate
9600 Off Off
Fixed
9600 – 38.4 BAUD On Off Variable
6 & 7 COM 1 & 2 - Parity Bits SW6 SW7
No Parity Off Off
Odd Parity On Off
Even Parity On On
8 Auto Power Save SW8
Power save disabled OFF Manual On/Off
Power save enabled ON Auto Power down

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3.3 Communications:
The S3750THS Printer has two serial communication UARTs. It is able to
support two modes of communication simultaneously – Either RS232 and IrDA ( If
Dip switch # 1 is ON) or RS232 and 802.11b /BT (If Dip switch # 1 is OFF and Dip
Switch # 3 is ON).
Dip Switch # 2 is used to control the RS232 Port. If the Switch is turned ON the
RS232 port is disabled and if it is turned OFF the RS232 Port is enabled. If RS232
interface is not required, disabling the port will save battery power.
Bluetooth or 802.11b RF communication is available if optional daughter boards are
installed ( 802.11b). The printer can have either Bluetooth or 802.11b enabled but
not both of them at the same time.
3.3.1 Serial Communications specification:
The RS232C Interface signals for the S3750THS Series printers are
terminated on a 6 PIN RJ type data connector located on the side of the
printer.
Six connections are provided from the Serial Interface to the host computer.
The TABLE 3 below lists the Serial Interface signals and pin outs on the RJ
connector and the connector pin locations are shown in FIGURE 6.
A minimum of two connections are required for operation: RXD – pin 3 and
Common – pin 1
The communication Parameters: Baud rate, Data Bit and Parity must be set
same as the host device settings.
FIGURE 6 – RJ DATA CONNECTOR
TABLE 3 - 3
37 75 50 0T T P Pr ri in nt te er rs s’ ’ S Se er ri ia al l R RS S2 23 32 2C C I In nt te er rf fa ac ce e s si ig gn na al ls s

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3.4 Infrared Communications Mode( IrDA Only) :
Dip Switch #1 and # 2( Disable UART 0) must be in the <ON> position.
The printer can be powered up by pressing the power <On/Off> switch
If no IrDA connection is made, the printer will automatically power down to a
lower power level to conserve battery life. It will remain in a “sleep” mode
until an IrDA connection is made, at which time the printer will “wake” up
and print the requested data
If Dip Switch # 1 and # 2 only are ON then the baud rate of the IrDA
communication is set at 9600 bps. If you wish to default to variable IrDA
( 9600- 38400) then you should also turn Dip Switch # 4 ON.
Pressing the power switch again will turn the printer <OFF>.
3.5 Bluetooth/802.11b Communications Only :
Dip Switch #1 must be in the <OFF> position
Dip Switch # 3 and # 2 must be in the <ON> position
Note:Since UART 1 (RS232) and UART 2 (IrDA/BT/802.11b) share the
same Dip Switches, the same baud rate , parity and stop bits settings
apply both for RS 232 and BlueTooth/802.11 (Refer to Developer’s
Manual for further details)
Note: Adjust settings to match those of the BT or 802.11b module in your
computing device
The printer can be powered up by pressing the power <On/Off> switch
Depending on Whether you have an 802.11b or a BLuetooth Module installed
the printer will enter that state respectively.
Pressing the power <On/Off> switch again will turn the printer <OFF>.
Note :It is necessary for the mobile computing device you are using to
discover the printer. Refer to the instructions provided by the systems
integrator.
Note: Systems Integrators: Refer to the Bluetooth manual provided with
your mobile computer and the Bluetooth section of the Developer’s
Manual /802.11b Application Note available for this printer.
3.6 Using the Magnetic Stripe Reader:
The Magnetic Card Reader is a factory-installed option. This option requires
special application software to read and process cards with a magnetic stripe,
such as credit cards or driver’s license
Note: Refer to the Figure 4 if your printer is equipped with the optional
magnetic stripe reader
Quickly swipe the card through the reader either left to right or right to left.
The magnetic stripe must be facing toward the paper supply door as
indicated below while it is passed through the reader
Refer to Table 4 for the description of the LED indicator Status.
LED indicator State Status
Green
ON
OFF
Ready/waiting for card to be swiped.
Good swipe - Card data read OR
Card not ready to be swiped.
Red ON Error reading card’s data.
T
Ta ab bl le e 4 4 - - M Ma ag gn ne et ti ic c C Ca ar rd d L LE ED D I In nd di ic ca at to or r

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Fi ig gu ur re e 4 4: : U Us si in ng g t th he e M Ma ag gn ne et ti ic c C Ca ar rd d R Re ea ad de er r
3.7 Programming Information:
This section lists the printer control commands strings.
System Developers: Please refer to S3750THS programmer’s manual for
further details.
Other features may be available and are described in the programmer’s
manual
3.7.1 ASCII CONTROL CHARACTERS:
Character Hex/Dec CONTROL ACTION
EOT 04/04 End Of Text
BS 08/08 Back Space
HT 09/09 Horizontal Tab
LF 0A/10 Line Feed
VT 0B/11 Vertical Tab
FF 0C/12 Form Feed
CR 0D/13 Carriage Return
SO 0E/14 Shift Out
SI 0F/15 Shift In
XON 11/17 Transmitter On.
AUXON 12/18 Printer on.
XOFF 13/19 Printer receiver is off
NORM 14/20 Return to default 42 column mode
AUXOFF 15/21 Printer to Host: printer is off
CANCEL 18/24 Cancel and reset printer BUFFER
ESC 1B/27 Escape
EXTEND 1C/28 Extended print
EXTEND OFF 1D/29 Extended print off/Normal print

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3.7.2 Printer Font Commands – Courier Character Set:
Font Name Character size (W x H) Command String
24 CPI normal 8x23 ESC+'k'+'5'
21 CPI normal 9x23 ESC+'k'+'4'
19 CPI normal 10x23 ESC+'k'+'3'
16 CPI normal 12x23 ESC+'k'+'2'
12 CPI normal 16x23 ESC+'k'+'1'
13 CPI rotated 14x16 ESC+'k'+'0'
3.7.3 Printer Font Commands:
Command String Printer Action
ESC - ‘F’ – 1 Selects International character set
ESC - ‘F’ – 2 Selects PC Line Draw character set
ESC - ‘U’ - ‘1’ Enable emphasized print.
ESC - ‘U’ - ‘0’ Disable emphasized print.
3.7.4 Printer Graphic Commands:
Command String Printer Action
ESC - ‘a’ – n Select dot line spacing between printed lines.
ESC - ‘J’ – n Graphic Line Feed command
ESC - ‘P’ - ‘#’ Select Online mode, characters printed as received.
ESC - ‘P’ - ‘$’ Select Buffer mode, characters are printed on (^ D)
ESC - ‘V’ - n1 – n2 8-bit Graphic command
ESC - ‘v’ - n1 – n2 RLE Compressed Graphic command
3.7.5 Magnetic Card Reader Control Commands:
Command String Printer Action
ESC - ‘M’ - ‘nnm’ - Cr Select MCR with (nn) auto timeout
ESC – ‘C’ Cancel MCR read process
3.7.5.1 Smart Card Reader Control Commands (when SCR is installed):
Command String Printer Action
ESC - ‘M’ - ‘nn’ - ‘7’- Cr Select SCR in direct mode with
Serial RS232 (UART0). (nn) is the
auto timeout of the SCR.
ESC - ‘M’ - ‘nn’ - ‘8’- Cr
Select SCR in PassThru mode with BT/802.11 or IrDA on (UART1).
(nn) is the auto timeout of the SCR.

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3.7.6 Graphic Logo and Bar code commands:
Command String Printer Action
ESC – L – G –n Prepare printer to load image:
ESC – G - 0x0FF Loading Logo Complete:
ESC – L – g – n Print stored logo image:
ESC - 'z' - n1 – n2 - L - [data] Print Bar Code without visible text
ESC - 'Z' - n1 – n2 - L - [data] Print Bar Code with visible text
ESC - ‘Q’ - ‘J’ – n Reverse Dot Feed
ESC - ‘Q’ - ‘Q’ – n Set Out of Paper Sensitivity
ESC - ‘Q’ - ‘F’ – m Set Forward Black Mark Seek
ESC - ‘Q’ - ‘B’ – m Reverse Black Mark Seek
3.7.7 Printer Supervisory and Control Commands:
Command String Printer Action
^V Buffer, power timer & battery status
^B Buffer status
ESC - ‘P’ –‘^’ Print Battery Voltage
ESC – ‘M’ - ‘000’ - Cr disable the power down timer
ESC - ‘M’ - ‘nn0’ - Cr sets the power down timer to nn seconds
ESC – ‘M’ - ‘C’ Reset Auto power down to 20 seconds
ESC – ‘P’ – ‘( ‘ Firmware version query
ESC – ‘ P’ - ‘)’ Hardware model query:
ESC – ‘ P’ - ‘+’ or ‘-‘ Enable or Disable EOT printer response
Resident Character Sets (characters 32 through 255):

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4. Printer Maintenance
4.1 Cleaning:
You may need to clean the print head and platen roller after printing a number of
rolls of paper, whenever you load new supplies or when you see voids in the
printout.
!Caution: Do not use sharp objects to clean the print head. This may
damage the printer and require service.
Open the paper door by pulling the “T” bar lever on the top cover as shown
in Figure 3. The paper supply door will pop up.
Remove the paper roll.
Moisten a cotton swab with isopropyl alcohol and clean the print head
Clean the platen roller with a dry cloth or small brush
Note: You can also use another cotton swab moistened with isopropyl
alcohol. Turn the platen roller with your finger and run the cotton swab or
dry cloth across it. Make sure the platen roller is clean all the way around.
Moisten another cotton swab with isopropyl alcohol. Rub the swab across the
black mark sensor to remove any build-up
Moisten another cotton swab and rub the swab across the tear bar to remove
any build-up
Note: You may experience dust build-up depending on the environment
and the quality of the paper supply you use. If this occurs, use a can of
compressed air to blow dust and paper debris out of the printer.
4.2 Charging the Printer Battery:
The printer battery is charged using the wall mounted charger provided. Follow
these steps to charge the battery pack.
Plug the charger into an appropriate wall socket; then plug the charger line
cord into the adapter jack on the side of the printer (see Figure 3)
The yellow CHARGE LED will illuminate, to indicate battery is charging
The Charge LED turns off when battery cartridge is fully charged. It takes
about 180 minutes to fast charge the battery cartridge
To insure full charge, printer should not be operated while the battery is
charging.
4
4. .2 2. .1 1 I Im mp po or rt ta an nt t N No ot te es s o on n C Ch ha ar rg gi in ng g B Ba at tt te er ri ie es s
The model S3750THS printers require an adaptor output of 10VDC/1.4A.
The battery Fast-charge is initiated each time the power adapter is
connected to the printer
The fast-charge controller checks the battery’s voltage and temperature,
before the start of the fast recharge process. If the battery voltage or the
temperature is outside of the fast-charge limits, the charger defaults to
trickle charge at C/10 or 70 mA rate
Optional external battery chargers are available for Extech batteries

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4
4. .2 2. .2 2 I Im mp po or rt ta an nt t N No ot te es s o on n R Re ep pl la ac ci in ng g B Ba at tt te er ri ie es s
Check for the correct Extech part number for the battery and only order
that part for your new battery
!Caution: Risk of explosion if battery is replaced by an incorrect type.
!Caution: Dispose of used batteries according to instructions in Section
4.5
4.3 Verifying Battery Charge State:
It is strongly recommended testing your printer before returning to Extech. Follow
these steps to identify and correct any battery power problem that may be
encountered. These will help to identify that the fault is with the printer and not
some other part of your system.
To test the AC adaptor use a multi-meter and measure the output. Output
should be 10VDC
Press the <ON/OFF> switch and wait until all LED’s are off
Insert the AC adaptor plug into the printer. If the amber LED goes on, the
battery is not fully charged but the charge circuit is functioning.
The AC power portion of the circuit appears ok
Disconnect the AC Adapter once the battery has charged for 5 minutes or so.
Press and hold the <FEED> switch, then press and release the <ON/OFF>
switch and then release the <FEED> switch. The printer will print a “self test”
receipt
If the self test receipt is printed, the DC power is ok
Press <ON/OFF> switch and wait until all LED’s are off
Plug the AC adaptor into the printer. Press <ON>; the green LED is
illuminated and after about 20 seconds the LED should go off
If the amber LED is on, this will continue on through this test indicating that
the battery is accepting a charge and that the charge circuit is ok. At the end
of a 180 minute charge cycle the LED will go off.
4.4 Battery and Safety Information:
The printer is powered by a 7.4V Li-Ion battery cartridge.
Charging time in the printer is approximately 3.0 hours
Take the battery out of printer if storing the printer for long periods of time
The battery storage temperature is 40°F to 104°F (4°C to 40°C). Do not
store a fully charged battery at temperatures greater than 104°F (40°C) for
long periods of time – the battery may permanently lose charge capacity
Be sure to use a fully charged battery before long or battery intensive
printing sessions. Certain operations (for example, printing receipts with a lot
of bar codes and graphics) drain the battery more quickly than others
Dispose according to your local regulations. Do not throw in trash
Caution: Do not disassemble, short circuit, heat above 80°C, or
incinerate. The battery may explode
The recommended temperature for charging is between 68°F (20°C) to 77°F
(25°C).

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4.5 Recycling your Batteries:
The Rechargeable Battery Recycling Corporation (RBRC) is a non-profit organization
created to promote recycling of rechargeable batteries. For more information about
how to recycle batteries in your area, visit www.rbrc.org.
4.6 Trouble Shooting:
Problem Action
Does not feed paper or has
a paper jam. Remove any jammed supply
Reload paper supply.
Does not print Check or replace the printer’s battery
Make sure the paper supply is loaded
correctly, not backwards.
Verify communication between the host
device and the printer by disconnecting
the communication cable and performing
a printer self test.
Light printing Check or recharge the battery
Adjust the print contrast through print
application.
Voids in printing Clean the print head following the cleaning
instruction listed in Cleaning section.
Red (Error) LED on Check that paper roll is not out
Error reading MCR
After extended printing, print head may
be hot; printer will pause before resuming
printing.
If the problem is not identified following above trouble shooting guide, contact
Extech Technical Support. Support numbers and Email addresses are listed at
www.Extech.com.
Other than routine cleaning and other maintenance described in Section 4, the
printer is not intended to be serviced by the user. It must be returned to an
authorized service center. Under no circumstances should the user attempt to take
the printer apart.