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TC-610P Service Manual
91
MCU
Start
Normal power-up
alert tone?
Speaker works?
No
MCU operating
voltage VCC is
normal?
Yes
MCU clock crystal
X601 works?
Yes
Check other
control pins work
normally?
Yes
MCU works
normally?
No
Replace speaker
No
Check U606
No
Replace X601
No
Check pin
connection or
download
program again
No
Yes