Sindoh M403 - Manual (Page 219)

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Maintenance and Troubleshooting
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Trouble 15 : Cannot connect the network.
Troubleshooting : Check the cable.
- For the wire network.
Check if the LED lamp blinks.
If not, the network is not properly connected.
To check if the network cable has a problem, connect the network able to
the PC or other device.
- For the wireless network.
Check if the LED of the wireless adapter is on.
Troubleshooting
If the LED of the wireless adapter is on, Check the wireless AP’s SSID and password
(if necessary), and then retry.
If the wireless AP is not found, it has a problem or reception is week. Use other network device
(PC, smart phone) to see if the AP is found and reception is appropriate.
If the reception level is low, put the wireless AP closer to the device.
Device Quality Troubleshooting
Replace consumables to improve device quality or maintain parts which reached end of its life.
See below instructions for device quality troubleshooting.
If you cannot solve the problem, contact our dealer.
Trouble 1: Text is blurred.
Troubleshooting : 1) The toner may be low. Replace the toner cartridge.
2) The drum cartridge may have a problem.
Replace the new drum cartridge.
3) Set toner density to 8 or higher from the printer
setting or driver.
4) Select correct settings for OHP, card stock or label
paper from the device driver.
5) Check if paper is wet.
6) Do not use rough paper.