Fm/Rds Section; Am Section - Arcam AVR300 Service Manual

AVR300

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.
Connec-
tion of
Item Step
instru-
ment
1
FM
2 Fig.1
IF/RF
3
Stereo
Distor- Fig.2
tion
Stereo
Sepa- Fig.2
ration
Muting
Fig.1
Level
RDS Fig.3

AM SECTION

AM Modulation: 400Hz, 30%
For UL Version
Step AM SG output
1 —
600kHz
2 400Hz 30% mod.
60dB/M
600kHz
3 400Hz 30% mod.
60dB/M
For CE Version
Step AM SG output
1 —
600kHz
2 400Hz 30% mod.
60dB/M
600kHz
3 400Hz 30% mod.
60dB/M
SURROUND SOUND RECEIVER
Stereo
FM SG output modula-
tor output
99.0MHz 1kHz
75kHz devi. —
66dBf (60dB)
99.0MHz Ext. Channel
mod. 66dBf L or R
(60dB) 1kHz
99.0MHz Ext. Channel
mod. 66dBf L or R
(60dB) 1kHz
99.0MHz 22dB —
99.0MHz Ext.
mod. 66dBf
—
(60dB) RDS
4% MOD
Tuning frequency
530kHz Digital DC voltmeter
600kHz
990kHz
Tuning frequency
522kHz or 531kHz Digital DC voltmeter
603kHz
999kHz
Tuning Output
frequency indicator
DC volt-
meter
AC volt-
99.0MHz
meter
Distortion
analyzer
Distortion
99.0MHz
analyzer
Oscillo-
99.0MHz
scope
Oscillo-
99.0MHz
scope
99.0MHz —
Output indicator
QSC coil on RF block M971
AC voltmeter RF coil on RF block M971
AC voltmeter
Output indicator
QSC coil on RF block M971
AC voltmeter RF coil on RF block M971
AC voltmeter
- 7 -
Adjustment
Adjust for
point
L941 0±100mV
IFT on the
Maximum
front end
L942 Minimum
IFT on the
Minimum
front end
Maximum
R956 Separa-
tion
Signal
R941
output
— —
Adjustment point
L972
Adjustment point
1.35±0.2V (531kHz)
L972
Remarks
FM MUTE/MODE
switch: ON/AUTO
Repeat the steps 1
to 3 until no further
adjustment is neces-
sary.
FM MUTE/MODE
switch: ON/AUTO.
Don't turn more than
+/-180°.
Repeat stereo
distortion and stereo
separation align-
ment until THD at
minimum and sepa-
ration at maximum.
Decode the RDS
Program Station.
Adjust for
1.35±0.2V
Maximum
Maximum
Adjust for
Maximum
Maximum