Yamaha TX-497 Service Manual page 11

<LW TUNER SECTION>
To be adjusted after MW section adjustment.
Use the specified dummy anetenna for loop antenna.
Step Adjustment item
Verification of
sensitivity.
1
Verification of the signal
meter.
2
Verification of auto
tuning.
3
Reception
Signal (ANT IN)
frequency
AM SG: Preset
171 kHz/225 kHz/270 C-2: 171 kHz
kHz 90 dBµ, C-3: 225 kHz
1 kHz, C-4: 270 kHz
30% modulation
AM SG: Preset
225 kHz 90 dBµ, B-2: 225 kHz
ANT input 90 dBµ
ANT input -10 dBµ or
less
AM SG: Preset
225 kHz 60 dBµ, B-2: 225 kHz
1 kHz,
30% modulation
AM dummy antenna
AM
SG
Adjusted
Test point
point
OUTPUT
Tuning
button
TX-497
AM loop antenna
AM ANT
GND
Rating
To be less than 66
dBµ.
Make sure that the
signal meter is
turned on.
Make sure that the
signal meter is
turned off.
Automatic reception
should be available
when the tuning UP
or DOWN key is
pressed.
Audio muting should
be applied during
tuning.
11