Troubleshooting Flow Chart - HYT TC-508 Service Manual

Troubleshooting Flow Chart

TX Circuit
Low TX
power
Check the
antenna.
No sound
Check the
voice channel
(MIC, D102)
Start
No
transmission
No
Normal TX
power supply?
Yes
No
LED of D604
glows red？
Yes
Check the
TX channel.
Check Q402,
Q403 and
Q404 .
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TC-508 Service Manual
LED fails to Replace
glow/flash.
Check the TX
power supply.
No
TX VCO Check the
locked? TX VCO.
Yes
Replace
D604.
Check the
APC circuit.
D604.