NAD C730, Руководство по обслуживанию

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11
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.
OUTPUTS
- Connect the non-inductive type resistor of 8 ohms to all
speaker terminals otherwise noted.
Item
FM
IF/RF
Stereo
Distortion
Stereo
Separation
Muting
Level
Signal
output
Step
1
DC voltmeter L941
0±100mV
3
Distortion
analyzer
Distortion
analyzer
Oscilloscope
Oscilloscope
L942
R956
R941
Minimum
Minimum
2 AC voltmeter
IFT on the
front end
IFT on the
front end
Maximum
Maximum
separation
Connection
of instrument
Fig.1 –
–
Fig.2
Fig.2
Fig.1
Channel L
or R 1kHz
99.0MHz
1kHz 75kHz devi.
65dBf (60dB)
99.0MHz Ext.
mod. 65dBf
(60dB)
FM SG
output
Stereo mod-
ulator output Tuning
frequency
99.0MHz
99.0MHz
Channel L
or R 1kHz
99.0MHz Ext.
mod. 65dBf
(60dB)
99.0MHz
mod. 65dBf(60dB)
RDS 2% MOD
99.0MHz
1KHz 75KHz devi
33dBµ
99.0MHz
mod.65dBf(60dB)
99.0MHz 18dB
99.0MHz
99.0MHz
Pilot
Suppression
Signal
Strength
Indicator
RDS
MIN
7 bars just
lit
VTVM
VFD Signal
Bars
L903 FOR L
L904 FOR R
R991
Channel L or
R pilot on
signal
–
Fig.2
Fig.1
Fig.3
99.0MHz
99.0MHz
– – – –
99.0MHz
Output
indicator
Adjustment
point
Adjust
for
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
Decode the RDS-
program station
AM SECTION
AM Modulation: 400Hz, 30%
For AH Version
Step
1 –
2
3
530kHz
600kHz
990kHz
600kHz
400Hz 30% mod.
60dB/m
AM SG
output
Tuning
frequency
Output
indicator
Adjustment
point
600kHz
400Hz 30% mod.
60dB/m
AC
voltmeter
AC
voltmeter
Digital
DC
voltmeter
L972
OSC coil
on RF
block M971
RF coil
on RF
block M971
Adjust
for
1.35±0.2V
Maximum
Maximum
Step
1 –
2
3
522kHz
or
531kHz
603kHz
999kHz
600kHz
400Hz 30% mod.
60dB/m
AM SG
output
Tuning
frequency
Output
indicator
Adjustment
point
600kHz
400Hz 30% mod.
60dB/m
AC
voltmeter
AC
voltmeter
Digital
DC
voltmeter
L972
OSC coil
on RF
block M971
RF coil
on RF
block M971
Adjust
for
1.3±0.2V (522kHz)
1.35±0.2V (531kHz)
Maximum
Maximum
For C Version
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.