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MCP31LB Star Micronics: Troubleshooting

Showpass Support
Updated

Power does not turn on

Are the power cable and AC adapter connected correctly?
If the Power LED does not light up when the power is turned on, it may mean that the power cable or AC adapter is not correctly connected. Please check the connection. And make sure that the power socket is correctly connected.
 

Cannot establish Bluetooth communication

Are the power cable and AC adapter connected correctly?
Please check that the Power LED is turned on.
If the Power LED does not light up when the power is turned on, it may mean that the power cable or AC adapter is not correctly connected. Please check the connection. It may also mean that the power socket is loose. Check and make sure that the power socket is correctly connected.
 
iOS devices <MCP31LB, MCP31LBNH model only>
Please check that the Power LED and Bluetooth LED light up blue.
If the LED display shows "Bluetooth not connected" (the Power LED lights up blue and the Bluetooth LED is turned off), Bluetooth connection is disabled.
Open the Bluetooth Setting of the host device, and check whether the connection with the desired printer is completed.
 
When using the MCP31LB model or MCP31LBNH model, are multiple tablets being used? Or is an iOS device (iPad, iPhone and such) being used?
Check whether the printer is already connected to another iOS device via Bluetooth.
If connected, then remove the connection to the connected iOS device, and then try to connect to the Bluetooth from another host device.
 
When using the MCP31LB model or MCP31LBNH model, is the iOS device (iPad, iPhone, etc.) which you want to connect by Bluetooth already connected to USB-A (2.4A) for charging?
A single iOS device (iPad, iPhone, etc.) cannot be connected simultaneously via Bluetooth and USB-A (2.4A).
When the iOS device connected via Bluetooth is connected to USB-A (2.4A), communication and power supply are established for the device connected to USB-A (2.4A), and the Bluetooth connection is released.
 

Bluetooth communication is not stable

Are there any nearby objects that may interfere with communication?Is the distance between the printer and host device too great?
The communication status of the Bluetooth printer will depend on any nearby radio waves, presence of interference, and the environment in which it is installed. When installing this product, perform a thorough evaluation beforehand.
Take the necessary measures after referring to Precautions on Bluetooth printer use.
 

Receipt is not printed properly

Is the power turned on? Are the power cable and AC adapter connected correctly?
Please check that the Power LED is turned on.

If the Power LED does not light up when the power is turned on, it may mean that the power cable or AC adapter is not correctly connected. Please check the connection. It may also mean that the power socket is loose. Check and make sure that the power socket is correctly connected.
 
Is the printer cover closed securely?
Check that the Power LED has not lit up red.
If the printer cover is not closed securely, it causes a cover open error (the Power LED lights up red), which results in a printing failure.
To close the printer cover, push both of its sides.
 
Is the sheet facing the correct direction?
If a white sheet is being ejected, then it may be possible that the paper roll is set in the opposite direction. Check the direction of the paper roll to make sure that the paper is set correctly.
 
Does the paper being used fit the specifications for the printer?
As this product is a thermal printer, it will not print on ordinary paper. Also, if there are issues such as faint printing of words, the cause may be that the paper does not meet the specifications, or the paper has become old and deteriorated.
Check the appropriate paper roll specifications and use paper that meets the printer's specification.
 
Is the LED display in standby state (the Power LED lights up blue and the Error LED is turned off)?
If the Power LED is blinking or it has lit up or is blinking in a color other than blue, refer to the LED Display and check the product status.
 
Does a paper jam occur?
If you can hear the printer operating but the paper is not being ejected, there is a possibility that a paper jam is occurring or the paper is being rolled onto the rubber roller. If a paper jam occurs, remove the paper in question, referring to "Paper Jam".
Do not touch the paper or block the outlet while the paper is being discharged.
When the width, thickness, or other details do not meet the required specifications, it may easily cause paper jams.
Check the appropriate paper roll specifications and use paper that meets the printer's specification.
 

The printer cover does not close

Is the diameter of the paper roll being used too big?
If the printer cover does not close, confirm that the diameter of the paper roll is 83mm or smaller.
Check the appropriate paper roll specifications and use paper that meets the printer's specification.
 

Cannot open the printer cover

Is the cutter locked?
If the printer cover does not open even when you pull the opening lever, it is likely that a paper jam has occurred, and the cutter has locked. Do not force the printer cover to open or pull on the paper.
First turn off the power and then turn the power back on again. This will automatically release the lock.
If the cutter is not unlocked even after the power is turned on again, contact the seller.
 

Cash Drawer Troubleshooting

If the cash drawer that is used by connecting it to the printer opens unintentionally at the time the printer power is turned ON, this can be avoided by changing the printer settings.  Follow the procedure below and change the settings.
 
  1. Use an iOS or Android tablet or smartphone to install Star Quick Setup Utility.Use App
  2. Start Star Quick Setup Utility.
  3. Connect to the desired printer.
  4. Tap [Printer Settings], [Memory Switch Settings].
  5. Set the mode switch at the top to [Bit] and select “Memory Switch 7” from the picker at the bottom, then set “Bit 1” in the Number field to "OFF".
  6. Tap [Apply].