3. BT can not work
4. AUX IN cannot work
Check that the BT antenna is correctly connected
to [CON2 and CON3].
Yes or no?
Check that [XP1: 1,5pin] of the MAIN PCB is 3.3V.
Yes or no?
Replace the old AU_OPT PCB of the EUT with a
new one.
Replace the old MAIN PCB of the EUT with a new
one.
Replace the old MAIN PCB of the EUT with a new
one.
Reconnect the antenna correctly.
If pin1 is defective, replace [U5].
Replace the AU_OPT PCB.
YES
YES
YES
YES
NO
NO
NO
YES
Check that module [R123 of MT8516S] is 3.3V.
Yes or no？
Check that the [8pin cable] is connected to the
MAIN PCB.
Yes or no?
Replace the new MAIN PCB.
Reconnect or use a new [8pin cable] instead.
NO
NO
52
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
