Icom IC-H6 Service Manual page 25

Oscillo--
AF
Signal
Millivolt
scope
meter
Generator
SP
JACK
EXT.
RF
Voltmeter
SP
0
Power
IC 1
Supply
(MAIN)
(8.4V)
C. 2nd LO Frequency Check
Connect a 16.9MHz amplifier to the frequency counter, check the frequency of X101 (2nd OSC)
with a loose couple. It should be: 16.900MHz ±400Hz.
D. Receiver Spurious Response
Connect a speaker and millivoltmeter to the EXT SP. Connect a 50 ohm dummy load to the
antenna terminal. All receiver spurious should be supressed less than 3dB, over entire frequency
range.
E. Receive Audio Output
Connect a millivoltmeter, oscilloscope, and a distortion meter to the EXT SP connector. To the
ANT terminal connect the signal generator and set the signal generator to
-80
to -90d8m and
deviation to 3.5KHz. Turn up AF VOL control. Read the millivoltmeter when the distortion is
10%.
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