IV - 10
[4] No printing is performed.
[5] The USB/Serial/LAN interface malfunction.
Y
N
N
Y
Y
N
Tape feed is normal but cannot print.
Correct the connection.
Replace the thermal head ASSY.
Replace the main PCB ASSY.
Is the print head cable
connected correctly?
Is the thermal head
appearance normal?
If replace the main PCB
ASSY, is it OK?
Replace the power supply ASSY.
Y
N
N
Y
* The serial cable and the LAN cable are
equipped only for QL-720NW.
The interface malfunction.
Is the USB cable or
serial cable or LAN cable
connected correctly?
Is the USB cable or
serial cable or LAN cable
damaged?
The USB cable or serial cable or
LAN cable is defective.
Replace the cable.
Correct the connection.
Replace the main PCB ASSY.