Am Adjustment; Adjustment Of Sensitivity - Yamaha RX-V795a Service Manual

RX-V795a/RDS/HTR-5170

AM Adjustment

(This should be done after FM adjustment.)
Connection Diagram (Measuring instruments)

1) Adjustment of sensitivity

See page 22 for TP locations & adjustment points.
Adjustment item
Step
Adjustment of
1
sensitivity
Verification of
2
sensitivity
Verification of signal
3
meter
Verification of auto
4
tuning
* : Execution of FACTORY PRESET (Refer to page 16.) will facilitate setting reception frequency for adjustment.
25
AM loop antenna
AM ANT
AM
AM SG
Dummy
Antenna
GND
Reception
Signal (ANT IN)
frequency
630kHz
AM ANT
630kHz * (B-1)
50dBµ
1kHz
30% modulation
630kHz
AM ANT
630kHz * (B-1)
1080kHz
1080kHz
* (B-2)
1440kHz
30% modulation 1440kHz
* (B-3)
1080kHz
AM ANT
1080kHz * (B-2)
90dBµ
MONO
1kHz
30% modulation
–10dBµ or less
AM ANT
60dBµ
L
ACVM
TUNER
R
P. C. B.
REC
DIST. M
OUT
Oscilloscope
Adjustment
Test point
point
REC OUT
T2
REC OUT
Rating
Audio output should be
maximized.
Repeat steps 1 and 2.
Check to ensure that the voltage at
the ANT terminal is 54dBµ or less.
All S-meters should light.
All S-meters should turn off.
Auto reception should be avail-
able when the tuning key is moved
UP and DOWN.
Audio must be muted during
search.