Troubleshooting Flow Chart - HYT TC-580 Service Manual

Troubleshooting Flow Chart

TX Section
Low TX Power
Check antenna
No Sound during
transmission
Check the audio path
(MIC, D108)
connection
Start
No transmission
No
Normal TX
power supply?
Yes
No
LED of D609
TX VCO locked?
glows red?
Yes
Replace D609
Check TX path
Check Q402, Q403
and Q404
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TC-580 Service Manual
LED fails to
Replace D609
glow/flash
Check the TX
power
No
Check TX VCO
Check the APC
circuit