Troubleshooting Flow Chart; Tx Circuit - HYT POWER446 Service Manual

Troubleshooting Flow Chart

TX Circuit

Low TX
power
No sound
Check the
voice channel
(MIC,VR200,
D104)
Check the
antenna.
Start
No LED fails to
transmission
No
Normal TX
power supply?
Yes
No
LED of D602
glows red？
Yes
Check the
TX channel.
Check Q400.
Q401, Q402
and Q403 .
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POWER446 Service Manual
Replace
glow/flash. D602.
Check the TX
power supply.
No
TX VCO Check the
locked? TX VCO.
Yes
Replace
D602.
Check the
APC circuit.