Yamaha TX-550 - Page 7

TX-550
Step
Item to be
Adjusted
Connection
terminal
Instrument
required
1
Zero
balance
FM
ANT
FM
SG,
SSG
98.1MHz 70dBn
MONO
100Hz
1
00%
modulation
TP1 <-^TP2 DCVM
2
Discriminator
balance
FM
ANT
FM
SG
88MHz
MONO
100Hz
1
00%
modulation
FMs
^
NVcc
DCVM
3
Monaural
distortion
FM
ANT
FM
SG
98.1MHz
70dB^i
MONO
100Hz
100%
modulation
OUTPUT
L.
R
DIST.
M
4
Stereo distortion
WIDE
Stereo distortion
NARROW
FM ANT
FM SG.
SSG
98.1MHz
70dBp
STEREO
L
or
R
1kHz,
100%
modulation
OUTPUT
L. R
DIST.
M
5
Verification of
monaural distortion
FM ANT
FM
SG
98.1MHz
70dBp
MONO
1kHz, 100%
modulation
OUTPUT
L. R
DIST. M
6
Separation FM ANT
FM SG, SSG
98.1MHz
70dBp
STEREO L or R
1kHz, 100%
modulation
OUTPUT
L,
R
ACVM
7
Verification
of zero
balance
75Q
FM ANT
Same
as
step 1
Adjustment
locations
Adjustment
method
Adjust T1,
so
that
voltage
between
TP1
and TP2
may
be
OV
± 50mV
when
tuned
to
generator.
Adjust T4,
so
that
voltage
between
FMs
and
NVcc
may
be OV
±
50mV
when
tuned
to
generator.
Reduce distortion
to minimum.
(WIDE
mode)
Rating or standard
Less than
~54dB
(WIDE mode)
0.16%
Reduce output
level
to
minimum.
Separation more than
36dB
(WIDE
mode)
Same
as step 1
If
not, return
to
stepi
and
readjust