Important Notes - NAD C 730 Service Manual

FM/RDS SECTION
INPUT
- FM mono: 1kHz, 75kHz devi., 60dB/µV
- FM stereo: 1kHz, 67.5kHz devi., 60dB/µV
Pilot signal 19kHz 7.5kHz devi.
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
Pilot
Suppression
Fig.2
Signal
Strength Fig.1
Indicator
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
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
Channel L or
99.0MHz
R pilot on
mod.65dBf(60dB)
99.0MHz
1KHz 75KHz devi
33dBµ
99.0MHz
mod. 65dBf(60dB)
RDS 2% MOD
Tuning Output Adjustment
frequency indicator
Digital
DC
530kHz
voltmeter block M971
AC
600kHz
voltmeter
block M971
AC
990kHz
voltmeter
Tuning Output Adjustment
frequency indicator
522kHz Digital
or
DC
531kHz voltmeter block M971
AC
603kHz
voltmeter
block M971
AC
999kHz
voltmeter
OUTPUTS
- Connect the non-inductive type resistor of 8 ohms to all
speaker terminals otherwise noted.
Tuning Output
indicator
frequency
DC voltmeter
AC voltmeter
– 99.0MHz
Distortion
analyzer
Distortion
99.0MHz
analyzer
99.0MHz Oscilloscope
– 99.0MHz Oscilloscope
99.0MHz VTVM
signal
VFD Signal
– 99.0MHz
Bars
–
99.0MHz
Adjust
point for
OSC coil
on RF
1.35±0.2V
RF coil
on RF
Maximum
L972 Maximum
Adjust
point for
OSC coil
1.3±0.2V (522kHz)
on RF
1.35±0.2V (531kHz)
RF coil
on RF
Maximum
L972 Maximum
11
Adjustment
Adjust
point
for
0±100mV
L941
IFT on the
Maximum
front end
L942 Minimum
IFT on the
Minimum
front end
Maximum
R956
separation
Signal
R941
output
L903 FOR L
MIN
L904 FOR R
7 bars just
R991
– –

IMPORTANT NOTES

1. Show the software version
Press "PRESET/TUNE" and
"TUNE UP".
2. Light UP all the icon on the
VFL
Press "PRESET/TUNE" and
"TUNE DOWN".
3. CPU Resets
Press "PRESET/TUNE" and
"TUNE DOWN" and any one
key.
4. AM Step 10K/9K Change
Add or delete the AM step
jumper - J201 in the key PCB.
Remarks
FM MUTE/MODE
switch: ON/AUTO
Repeat the steps
1 to 3 until no fur-
ther adjustment is
necessary.
FM MUTE/MODE
switch: ON/AUTO
Don't turn more
than +/-180˚
Repeat stereo
distortion and
stereo separation
alignment until
THD at minimum
and separation at
maximum.
Adjust such that
output just unmute
lit
Decode the RDS-
–
program station