Hytera TC-508 - Page 61

TC-508 Service Manual
60
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 U601,
U602, U604, and
U606.
Replace X601.
No
Yes
Other pins control
normally?
MCU works
normally.
Yes
No
Check the pins
connection or re-
programed
Replace the
speaker.