Yamaha TX-550 - AM Tuner Calibration

TX-550
TX-550
Step
Item
to be
Adjusted
Connection
terminal
Instrument
required
Adjustment
locations
Adjustment
method
Rating
or standard
8
Verification
of
Discriminator
balance
75n
FM
ANT
Same
as
atep
2
Same
as
atep 2
If
not,
retarn
to
step
2
and
readjust.
FMs
NVcc
DCVM
9
Full-scale
signal
quality
meter
75U
FM
ANT
FM SG,
SSG
98,1
MHz
45dBp
STEREO L,
R
1kHz, 100%
modulation
VR5
Adjust VR5
until all
signal
quality
indicators
light up.
(WIDE mode)
10
Verification
of
Blend
75Q
FM ANT
FM
SG,
SSG
98.1MHz
70dB^i
STEREO
L, R
1kHz, 100%
modulation
Check
that
when
blend
switch is
turned
on,
separation
decreases.
(WIDE
mode)
j
11
Verification of
auto
tuning
75Q
FM ANT
FM
SG
98.1MHz
26dBp
MONO
1kHz
30%
modulation
TUNING
knob
;
Automatic
reception
should
be
available
when
the
tuning
knob
is
rotated
UP and
DOWN.
Audio
muting
should
be
applied
during
tuning.
(AM TUNER
SECTION)
•
Make
the
AM
section
adjustments
after having
finished
the
FM
section
adjustment.
•
Connect
the AM
loop
antenna
to
the AM ANT terminal.
•
Connect
the AM
dummy
antenna for
adjustment to
AM
SG.
•
Check
that the AM
SG
precision
is
within
±0.1
kHz.
AM DUMMY
ANTENNA
CONNECTION
AM loop
ar»t?o
R 1 .
1
1
50
>
1
J
TEST
POINTS
IBIBSHnSial
7