Yamaha TX-497 Service Manual page 9

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