Troubleshooting Flow Chart - HYT TC-700P Service Manual

Troubleshooting Flow Chart

MCU
Normal power-on
Speaker works well?
MCU works normally.
MCU Check
Yes
alert tone?
No
Yes
Yes
9.8304 MHz
works normally?
`
Yes
No
Q610 works
Normally?
Yes
No
Pin10 is of
high level?
Yes
The RF circuit can't
be driven.
No
Replace the speaker
Read and write
available?
Replace Q610
Check M5V
72
TC-700P Service Manual
Check the
control circuit
Yes
Reset
No
Check reading
& writing circuit