No Printing Is Performed; The Usb/Serial/Lan Interface Malfunction - Brother P-touch QL-710W Service Manual

[4]

No printing is performed.

Tape feed is normal but cannot print.
Is the print head cable
connected correctly?
Is the thermal head
appearance normal?
If replace the main PCB
Replace the power supply ASSY.
[5]

The USB/Serial/LAN interface malfunction.

The interface malfunction.
serial cable or LAN cable
connected correctly?
Is the USB cable or
serial cable or LAN cable
The USB cable or serial cable or
LAN cable is defective.
Replace the cable.
N
Y
Y
N
Y
ASSY, is it OK?
N
Is the USB cable or
N
Y
Y
damaged?
N
Correct the connection.
Replace the thermal head ASSY.
Replace the main PCB ASSY.
Correct the connection.
Replace the main PCB ASSY.
* The serial cable and the LAN cable are
equipped only for QL-720NW.
IV - 10