Important Notes - NAD T 741 Service Manual

FM/RDS SECTION
- FM mono: 1kHz, 75kHz devi., 60dB/μV
- FM stereo: 1kHz, 67.5kHz devi., 60dB/μV
Pilot signal 19kHz 7.5kHz devi.
OUTPUTS
- Connect the non-inductive type resistor of 8 ohms to the all speaker terminals unless otherwise noted.
Connection
Item Step
of instrument
1
FM
2
Fig.1
IF/RF
3
Stereo
Fig.2
Distortion
Stereo
Fig.2
Separation
Muting
Fig.1
Level
Fig.3
RDS
AM SECTION
AM Modulation: 400Hz, 30%
For AH Version
AM SG
Step
output
1 –
600kHz
2 400Hz 30% mod.
60dB/m
600kHz
3
400Hz 30% mod.
60dB/m
For C Version
AM SG
Step
output frequency
1 –
600kHz
2 400Hz 30% mod.
60dB/m
600kHz
3
400Hz 30% mod.
60dB/m
FM SG Stereo mod-
output ulator output
99.0MHz
1kHz 75kHz devi.
65dBf (60dB)
99.0MHz Ext.
Channel L
mod. 65dBf
or R 1kHz
(60dB)
99.0MHz Ext.
Channel L
mod. 65dBf
or R 1kHz
(60dB)
99.0MHz 18dB
99.0MHz Ext.
mod.65dBf(60dB)
RDS 2% MOD
Tuning Output Adjustment
frequency indicator point
Digital OSC coil
DC on RF
530kHz
voltmeter block L971
RF coil
AC
on RF
600kHz
voltmeter
block L971
AC
990kHz L972
voltmeter
Tuning Output Adjustment
indicator point
522kHz Digital OSC coil
or DC on RF
531kHz voltmeter block L971
RF coil
AC
on RF
603kHz
voltmeter
block L971
AC
999kHz L972
voltmeter
Tuning Output
frequency indicator
DC voltmeter
AC voltmeter
– 99.0MHz
Distortion
analyzer
Distortion
99.0MHz
analyzer
99.0MHz Oscilloscope
– 99.0MHz Oscilloscope
99.0MHz –
–
Adjust
for
1.35±0.2V
Maximum
Maximum
Adjust
for
1.3±0.2V (522kHz)
1.35±0.2V (531kHz)
Maximum
Maximum
13
Adjustment
Adjust
point
for
0±100mV FM MUTE/MODE
L941
switch: ON/AUTO
IFT on the
Repeat the steps
Maximum
front end
1 to 3 until no fur-
ther adjustment is
L942 Minimum
necessary.
FM MUTE/MODE
IFT on the
switch: ON/AUTO
Minimum
Don't turn more
front end
than +/-180˚
Repeat stereo
distortion and
stereo separation
Maximum
R956
alignment until
separation
THD at minimum
and separation at
maximum.
Signal
R941
output
Decode the RDS-
–
–
Program Station.

IMPORTANT NOTES

1. Show the software ver-
sion
Press "FM/AM" and "EXT
5.1".
2. Light up all the icon on
the VFL.
Press "FM/AM" and "TONE
CONTROL".
3. Toggle between 9K and
10K
Press "FM/AM" and "CD".
4. Clear all tuner presets
Press "TAPE(MON)" and
"VIDEO 1".
Remarks