Led Does Not Turn On; Led Doe Not Turn On. - Brother P-touch QL-710W Service Manual

[3]

LED does not turn on.

LED does not turn on.
Is the cable of the SB PCB
connected correctly?
lines in the cable broken?
Is the input signal to
Is the voltage between each pin
more than 3V with an oscilloscope?
STATUS LED:
Green CN3, Pin4
Wi-Fi LED:
Green CN3, Pin8
Replace the main PCB ASSY.
N
Y
Are any of the
Y
N
N
the button OK?
Y
Red CN3, Pin3
N
* The ON/OFF button supports the Status LED.
The Wi-Fi button supports the Wi-Fi LED.
Correct the connection.
Replace the SB PCB ASSY.
Replace the SB PCB ASSY.
Y
Replace the SB PCB ASSY.
IV - 9