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THERMAL PRINTER 

BL2-58 

INSTRUCTION MANUAL 

This is a Class B product based on the standard of the Voluntary Control Council for Interference by 
Information Technology Equipment 

 

(VCCI). If this equipment is used in domestic environments, radio 

disturbance may arise. When such trouble occurs, the user may be required to take corrective actions.   

Introduction 

Thank you very much for purchasing the BL2-58 thermal printer. Read the ‘

Safety 

Instructions’

and‘

1.Operating Precautions’ 

carefully before using this printer for safe handling of it. 

Save these instructions for future reference. 

Safety instructions 

To use this equipment safety, or to protect damage to the equipment, the following

 

symbols are used 

throughout this manual to highlight safety information. 

 Warning 

The symbol indicates that failure to observe these instructions or mishandle this 
equipment could lead to severer injury or death. 

 Caution 

The symbol indicates that failure to observe these instructions or mishandle this 
equipment could lead to injury or only property damage 

Examples of Symbols 

 

The 

  symbol indicates caution (including DANGER or WARNING). The example in the 

left column indicates that caution or warning conditions exist. 

  The 

  symbol indicates the action is prohibited. The example in the left column indicates 

disassembly is prohibited. 

 

The 

 symbol indicates a required operation that must be performed or an obligatory 

Instruction. The example in the left column indicates unplugging is required. 

 Warning

 

 

Do not use any battery pack, AC adapter and AC power cord.   

Failure to follow this instruction may result in overheating or inflammation, which may lead to 

fire or accidents.

 

 

Do not bend the power cord forcibly, or place heavy objectives on the power cord. 

Doing so may damage the power cord and cause fire or electric shock. If the power cord 

Is damaged, discontinue using it.

 

 

Never disassemble the printer, the AC adapter, the AC cable, the battery pack and the 

battery charger. Failure to follow this instruction may result in overheating or inflammation, 

which may lead to fire or accidents.

 

Caution

 

 

Do not drop any metallic object nor spill coffee,soft drinksand, water and any other liquid.

  

 

As the thermal head may be very hot immediately after printing, do not touch it. Be sure that   

the thermal head is cool before removing the paper jam or cleaning the thermal head.

 

 

Do not plug or unplug the AC adapter and batteries with wet hand. 

It may result in electric shock, burn and failure.

 

 

Do not use the printer in place where it will be exposed to excess moisture and where is 

watered. It may result in electric shock, burn and failure.

  

 

Remove the interface cable or AC adapter from the connector or the receptacle by holding 

the connector or the AC plug. Never pull the cable itself. Doing so may damage the cable or 

adapter.

 

 

For following case, turn the printer power OFF, unplug the AC power cord from outlet, and 

remove the bettry. Continueous use may occur the printer failure, fire and electric shock. 

 In case the problem is not cleared and fixed 

 Emitting smoke, making unusual noise and odd smell from the printer 

 The metallic object dropped or spilled liquid into the printer

 

 

1.

Operating Precautions 

Observe the following for safe and proper operation. 

Notes on use 

Do not subject the printer to strong shocks by 
droping or hitting it. 

Turn off the power switch and keep the AC plug 
removed from the outlet when the unit is not 
used. 

Do not pull the paper from paper exit. It may 
cause the damage or failure of the printer 
mechanism. 

Notes on treatment of thermal paper 

Store the paper in a dry, cool and dark place. 

Do not rub the paper with hard substance. 

Keep the paper away from organic solvent. 

Do not let the paper touched with vinyl chloride 

film, eraser or adhesive tapes for hours. 

Do not put the paper on diazo print or wet copy 

that has just been copied. 

Notes on installation 

Install the printer on a level or upright and stable 

surface. 

Avoid such places with: 

Slanted surface, strong vibration, direct sunlight,
full of dust, excessively high or low temperature,
electromagnetic noise, corrosive gas 

2.  Preparation 

2.1

 

Unpacking 

 

After unpacking, check whether the complete set is 
present. 

    ・

Printer unit

                   

    1 unit 

    ・

Thermal paper (paper length 15m)      1 roll 

    ・

Instruction manual   

           

      1 volume

    ・

AC adapter

                   

   1 piece 

    ・

AC power cord

                   

1 piece 

  ★

For ordering the thermal paper, contact our sales 
office or local distributors. 

2.2

 

Components / parts   

 

Paper cutter

Paper cover

Window for checking paper

Operational panel Cover open button

IF connector

Power connector

 

Insert nut

Battery cover

 

 
Operational panel 

(1)

(2)

(3)

(4)

(5)

 

 

(1) POWER LED

Indicates the status of the power.

 

(2) ERROR LED

Indicates the error status.   

 

(3) SELECT button

Selects the printer mode. 

 

(4) POWER button

Turns the power ON/OFF. 

 

(5) FEED button

Feeds the thermal paper while 

pressing this button. 

 

3.  Handling 

3.1

 

Setting thermal paper 

 
 ①

Press the cover open button to open the paper 

cover. 

 

Set the paper roll as shown in the picture

Make 

sure the printing surface is correct, or it does not 
print properly

 

 

Close the paper with the tip end emerging from 

the tear bar. 

 

Handle the tear bar carefully not to injure 
the finger or hand. 

 

3.2

 

Battery pack 

Installing battery pack

 

 

 

Place the printer upside down. Press both sides 

    of the battery cover and push up the battery 
  cover. 

Place the battery pack on the bucket and slide 

    it toward the arrow direction until locked. 

  ③

Close the battery cover. 

 

Remove battery pack 

    Operate in a direction opposite to installing.   
 

Battery charge (Only chargeable mode) 

  ①

Turn the power ON with connecting AC adapter. 

  ②

Press SELECT button on the operational panel 

        for 3 sec, then POWER LED and ERROR LED 

  blink for charging.   

  ③

When the battery charging completes, the printer 
status becomes standby and POWER LED on. 

It takes for Ave.3 hours(UR-250), and for Ave.2.5 
hours(UR-121) to charge. (each Max. 4 hours)   

 

With a new full charged battery, the printer prints   
210m in case of UR-250, and prints 140m in case 
of UR-121. (Continuous printing

Printing density 

100%

Printing ratio 30%)

 

Keep the battery pack removed from the battery   

    case when the printer is not used for long period. 

After full charging of the battery pack, the printer 

    cuts off charging automatically and the printer does 
    not recharge again. Be sure the battery voltage is 

reduced after charging and discharging   
continuously because of memory effect. 

The battery pack is worn out after charging and 

    discharging. The battery capacity is reduced   
    80% of the new battery after 300 times charging. 

The battery works shorter time at low temperature 

  area. 

When the working time is noticeably shorter than 

    normal, replace the battery pack.   

The printer can not print while charging.

 

 

Do not dispose the battery pack, and 
bring it to the near recycling shop. 

 

3.3

 

How to set to upright wall 

Please ready two screws (M3x3mm), and set the 
printer to upright wall not sideling in the vicinity and 
from side to side, keeping power connector side 
down, using the insert nut in back side.

 

 

 

3.4

 

LED indication 

 

When an error occurs, POWER/ERROR LED lights 
or blinks depending on the type of errors. 

:Turn ON for 0.1sec

 ●

:Turn OFF for0.1sec 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 
 

3.5

 

Self test print 

  

Turning the power switch ON while pushing the   

    FEED button starts self test print. The printer prints 

character sets and barcode. 

 

 

3.6

 

HEX dump print 

 

Data entered from the computer is printed in 

hexadecimal numbers

While pressing SELECT 

button, turn ON the power switch. When the mode 
selecting is printed, press SELECT button, then 
starts the HEX dump mode. 

 

3.7

 

Function set 

Soft switch

 

 

Sets the printer function by Soft switch. 

  ①

While pressing SELECT button, turn ON the 

power switch. 

  ②

After printing the mode selecting, push FEED 

        button to enter the function setting mode. 

  ③

When a message is printed, press the FEED 
button for YES and the SELECT for NO. 

  ④

The printer prints 

SETTING MODE END

 

when ending. 

 

Setting items 

   

Classified setting items are as follows. 

    ・

COMMON SETTING   

Common information 

    ・

MODE-B SETTING

 

 

BL-58 compatible 

    ・

INTERFACE SETTING

Interfaces 

   For further information, please refer to the 

BL2-58 Technical Guide.

 

 

3.8

 

Maintenance 

    Clean the thermal head, platen roller and sensors 
    periodically. The details show in the Technical 
  Guide. 

 

Before cleaning the printer, turn OFF the 
printer power and disconnect the AC   
adapter and remove the battery pack   
from the case. 
Never get liquid such as water into the   
printer. 

 
 

4. Specifications 

4.1

 

General specifications 

Command systems:   ESC/POS

BL-58 

Print method:         Direct line thermal 

 

Interface 

   

BL2-58S

 

Serial (RS-232C) 

             

Connector

D-sub 9pin Male 

   

BL2-58P

 

Parallel (Centronics) 

             

Connector

D-sub25pin F-male 

   

BL2-58U

 

USB ver.2.0 

             

Connector

B type round 4-PIN 

 

Printing speed

 

Max.80mm/sec 

(Dedicated AC adapter, Printing ratio 12.5% 

or less

 

Printing width/paper width

 

48mm/58mm 

Barcode

 

UPC-A/E,JAN13/8,CODE39,ITF, 

CODABAR,CODE128 

Option 2D barcode 

  QR,MaxiCode,PDF417, 

MicroPDF417,DataMatrix 

Power source 

       

  Battery pack: Li-ion battery

option

 

           

Part No.

UR-250

UR-121 

Dedicated AC adapter 

     

    Part No.

BLS-120W 

         

  Input

AC100V

240V

50/60Hz 

         

  Output

DC9.0V

 

3.0A 

       

  AC power cord 

         

    Part No.

ACS-120A

Japan

 

         

           ACS-100G

Europe

 

         

           ACS-100U

USA

 

 

Dimensions (W×D×H

No protruding parts) 

     

   

 

  93mm×125mm×70mm 

 

Weight  

 

approx.265g 

without thermal paper and   

battery pack

 

 

Operating environment 

       Temperature  When battery is used 

10

 to 

50

 

     

When AC adapter is used 

       

0

 to 

40

 

     

While recharging battery 

       

0

 to 

35

 

     

Printing quality guarantee 

        +

5

 to 

40

 

Humidity

 

20%RH to 85%RH 

               

 

No condensation

 

 

Storage environment 

     

   

Temperature

  -

20

 to 

60

 

Humidity

 

10%RH to 90%RH 

       

 

 

     

 

 

No condensation

 

 

Thermal paper  Part No.

P-58-30 

                 Paper width

58mm 

   Length

approx.30m 

   Outer diameter.

50mm 

EMC regulations 
      VCCI CLASS B

FCC CLASS B

 

                CE marking 

 

Input buffer     8k bytes 

 

The model name details are listed in Technical   
Guide.

 (BL2-58□□□□QC)

 

Updated printer drivers, specifications, and 

  Technical Guide are listed in the Website. 

Windows is the registered Trademark of 
Microsoft Corporation. 

ESC/POS is registered Trademark of Seiko   
Epson Corporation. 

 

This instruction manual may be subject to   
change without notice due to product   
improvement.

 

―――――――――――――――――――――― 
 

 

 Head office 
  Taisou Ikebukuro Building 5F, 2-61-1 
  Ikebukuro, Toshima-ku, Tokyo, 171-0014,   

Japan 

 Phone: +81-3-3986-0646 (Representative) 
        + 81-3-3986-1188 (Overseas sales) 
 Fax: +81-3-3988-5876 
 URL:  http.//www./sanei-elec.co.jp 

                                (10.2008) 

Status POWER 

(Green) 

ERROR 

(Red) 

Retrieve 

Standby printing 

ON 

OFF

 

*** 

Initializing 

ON

 

○●○● 

Complete 
initialization 

Recharging 

○●○●  ●○●○ 

Complete 
charging 

Temperature 
error 

ON

 

○●●● 

Cooling down

Paper empty 

ON

 

ON

 

Put paper 

Paper cover 
open 

ON

 

ON

 

Close the 
cover 

Low battery 

○●○● 

OFF

 

Recharge 
battery 

Excess recharge 

○●●● 

ON

 

Contact Sanei

Upper limit 

voltage error 

OFF

 

OFF

 

Contact Sanei

Lower limit 

voltage error 

○●●● 

OFF

 

Contact Sanei

 

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