POWER446 Service Manual
44
MCU
Start
Normal
power-on alert?
The speaker
works normally?
Yes
No
Yes
No
Clock crystal
(X601) of MCU works
normally?
Normal VCC
(operating voltage of
MCU)?
Yes
No
Check U606.
Replace X601.
No
Yes
Other pins control
normally?
MCU works
normally.
Yes
No
Check pin
connection, or
reprogram.
Replace the
speaker.
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