HYT TC-610P Service Manual page 93

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