User's Manual

23
8.2 Transmission Trouble
Start
↓
Transmission is not made.
↓
Is the transmission voltage
normal?
No
→
Check if transmission
voltages of Q33 and
Q35 are 5V.
Yes↓
Is the voltage at the drive
end normal?
No
→
Are voltages of Q501
and Q502 normal (6V)?
(VTVM)
No
→
Check output voltages of
Q706 and Q707, and
replace them if necessary.
Yes↓ Yes↓
No
→
Check if Q501 and
Q502 perform
amplification at the
power drive end.
Check the rated output and parts.
-. Check diodes D101 and D300.
-. Check the harmonic filter.
-. Check the output of the power
FET Q503. (VTVM, RF Power meter)
No
→
Check the output end of
the FET Q503.
Check if the input level is
22dB
m
and the output level
is 37dB
m
or higher.
(RF Mill-volt meter)
↓
Yes↓ Yes↓
Replace Q501 and
Q502.
Is 5W of the rated output
generated?
No
→
Replace Power FET Q503.
Yes↓
Normal