Arcam DiVA AVR250, Руководство по обслуживанию

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AVR250
SURROUND SOUND RECEIVER
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.
Item Step
Connec-
tion of
instru-
ment
FM SG output
Stereo
modula-
tor output
Tuning
frequency
Output
indicator
Adjustment
point
Adjust for Remarks
FM
IF/RF
1
Fig.1
99.0MHz 1kHz
75kHz devi.
66dBf (60dB)
— 99.0MHz
DC volt-
meter
L941 0±100mV FM MUTE/MODE
switch: ON/AUTO
Repeat the steps 1
to 3 until no further
adjustment is neces-
sary.
2
AC volt-
meter
IFT on the
front end
Maximum
3
Distortion
analyzer
L942 Minimum
Stereo
Distor-
tion
Fig.2
99.0MHz Ext.
mod. 66dBf
(60dB)
Channel
L or R
1kHz
99.0MHz
Distortion
analyzer
IFT on the
front end
Minimum
FM MUTE/MODE
switch: ON/AUTO.
Don’t turn more than
+/-180°.
Stereo
Sepa-
ration
Fig.2
99.0MHz Ext.
mod. 66dBf
(60dB)
Channel
L or R
1kHz
99.0MHz
Oscillo-
scope
R956
Maximum
Separa-
tion
Repeat stereo
distortion and stereo
separation align-
ment until THD at
minimum and sepa-
ration at maximum.
Muting
Level
Fig.1 99.0MHz 22dB — 99.0MHz
Oscillo-
scope
R941
Signal
output
RDS Fig.3
99.0MHz Ext.
mod. 66dBf
(60dB) RDS
4% MOD
— 99.0MHz — — —
Decode the RDS
Program Station.
AM SECTION
AM Modulation: 400Hz, 30%
For UL Version
Step AM SG output Tuning frequency Output indicator Adjustment point Adjust for
1 — 530kHz Digital DC voltmeter QSC coil on RF block M971 1.35±0.2V
2
600kHz
400Hz 30% mod.
60dB/M
600kHz AC voltmeter RF coil on RF block M971 Maximum
3
600kHz
400Hz 30% mod.
60dB/M
990kHz AC voltmeter L972 Maximum
For CE Version
Step AM SG output Tuning frequency Output indicator Adjustment point Adjust for
1 — 522kHz or 531kHz Digital DC voltmeter QSC coil on RF block M971 1.35±0.2V (531kHz)
2
600kHz
400Hz 30% mod.
60dB/M
603kHz AC voltmeter RF coil on RF block M971 Maximum
3
600kHz
400Hz 30% mod.
60dB/M
999kHz AC voltmeter L972 Maximum