User's Manual

TC-700 Disassembly and Assembly for Repair
25
Trouble-shooting Chart
Normal power-on
alert tone?
MCU Check
The RF circuit can’t
be driven.
Yes
Speaker works
well?
NO
Replace
the speaker
NO
`
9.8304MHz works
normally?
Yes
Read
available?
Yes
Q501
works well?
Exchange
Q501
NO
Check M5V
MCU works well
Pin10 is of
high level?
Yes
Yes
Yes
Check the
control circuit
NO
Check the
circuit of read
frequency
Yes
Reset
NO