Yamaha TX-497 - FM Tuner Section Adjustments - Continued; AUTO TUNING Verification

9
TX-497
TX-497
Adjustment item
Verification of monaural
distortion.
Verification of stereo
distortion.
Verification of
sensitivity.
Adjustment of
separation.
Adjustment of the signal
meter.
Verification of the signal
meter to turn off.
Verification of AUTO
TUNING.
Ste
8
9
10
11
12
13
14
Signal (ANT IN)
FM SG:
98.1 MHz 70 dBµ
Modulation : 100 %
Monaural : 1 kHz
FM SG:
98.1 MHz 70 dBµ
Modulation : 100 %
Stereo L or R : 1 kHz
FM SG:
88.1/98.1/106.1 MHz
Modulation : 100 %
Monaural : 1 kHz
FM SG:
98.1 MHz 70 dBµ
Modulation : 100 %
Stereo L or R : 1 kHz
FM SG:
98.1 MHz 45 dBµ
Modulation : 30 %
Monaural : 1 kHz
ANT input minimum.
FM SG:
98.1 MHz 23 dBµ
Modulation : 30 %
Stereo L or R : 1 kHz
Adjusted
point
VR4
VR3
Tuning
buttons
Reception
frequency
Same as Step 1.
Same as Step 1.
A-6: 88.1 MHz
A-4: 98.1 MHz
A-7: 106.1 MHz
Preset
A-4: 98.1 MHz
Preset
A-4: 98.1 MHz
Preset
A-4: 98.1 MHz
Rating
Minimize distortion.
(to less than 0.7%)
Minimize distortion.
(to less than 1.4%)
Tuning mode is
AUTO.
S/N should be 30 dB
at each frequency of
88.1 MHz, 98.1 MHz
and 106.1 MHz.
Make sure that the
voltage at the ANT
terminal is 3 dBµ (7
dBµ at A, B, G, E
models) or less.
To more than 35 dB.
Tuning mode is
AUTO.
Adjust so that the
signal meter is
maximum at rating
level.
Make sure that the
signal meter is
turned off.
Automatic reception
should be available
when the tuning UP
or DOWN key is
pressed.
Stereo indicator is
turned on.
Audio muting should
be applied during
tuning.
Verification of AUTO PS
(program service name)
[B, G, E models only]
15
RDS SG:
Modulation : 1.6 %
(1.2 kHz)
FM SG:
98.1 MHz 40 dBµ
Modulation : 100 %
Monaural : 1 kHz
Preset
A-4: 98.1 MHz
Make sure that the
display automatically
turns to the PS
mode and PS
indicator turns on
when the signal is
tuned again.
Test point
OUTPUT
OUTPUT
OUTPUT
Signal
meter