Yamaha DSP-AX1/RX-V1 Service Manual page 38

DSP-AX1/RX-V1
AM Adjustment
(This should be done after FM adjustment.)
Connection Diagram (Measuring instruments)
1) Adjustment of sensitivity
See page 34 for TP locations & adjustment points.
Adjustment item
Step
Adjustment of
1
sensitivity
(1440Hz)
Verification of
2
sensitivity
(630kHz)
Verification of
3
sensitivity
Verification of auto
4
tuning
* : Execution of PRESET (Refer to page 27.) will facilitate setting reception frequency for adjustment.
37
AM loop antenna
AM ANT
AM SG AM SG
GND
Reception
Signal (ANT IN)
frequency
1440kHz
AM ANT
* (B-3)
1440kHz
50dBµ
1kHz
30% modulation
630kHz
AM ANT
* (B-1)
630kHz
50dBµ
1kHz
30% modulation
630kHz
AM ANT
* (B-1)
630kHz
1080kHz
1080kHz
* (B-2)
1440kHz
1440kHz
30% modulation
* (B-3)
AM ANT
60dBµ
L
ACVM
TUNER
R
P. C. B.
REC
DIST. M
OUT
Oscilloscope
Adjustment
Test point
point
T2 REC OUT
T2 REC OUT
AM ANT
Rating
Audio output should be
maximized.
Audio output should be
maximized.
Repeat the Step 1 and 2.
Distortion should be 10% or less at
each frequency.
Check to ensure that the voltage at
the ANT terminal is 54dBµ or less.
Auto reception should be avail-
able when the tuning key is moved
UP and DOWN.