Dual CR 3700 RC Serviceanleitung Seite 3

Tuning Instructions for CR 3700
Signal source Equipment
setting
Signal source setting Connection of
measuring instrument
Item to be tuned Tuning, Remarks
1) FM oscillator
87.5 MHz
DC voltmeter
to TP-TP 5
L4 1.6V DC ± 0.05V
108 MHz
Check approx. 8V DC
2) FM
ig
input circuit
FM signal generator
to 75 ohm
antenna Input
Frequency with-
out transmitters
approx. 98 MHz
0-1 mV, Shift ± 40 kHz
Mod. 1 kHz
Tune to approx. 98 MHz
Harmonic detector
oscilloscope to UR
speaker output via
load resistors
T 1, T 102 AF maximum
T 101 AF and harmonic
distortion minimum
90 MHz
Tune to app. 90 MHz
aircoils L1, L2, L3 AF maximum
3) FM IF (fine tuning)
Antenna to 75 ohm
antenna input
Receive strong
FM transmitter
at its nominal
frequency
DC voltmeter
to R 155
T 101 Determine DC max. and DC min.
T 101 Adjust power mean
T102 OV± 1 mVDC
Repeat tuning
4) Transition between monaural, stereo and muting; signal indication, channel separation
FM signal generator
to 75 ohm
antenna input
Frequency with-
out transmitters
approx. 98 MHz
mono key: Off
Tune to approx. 98 MHz
Shift ± 40 kHz,
Mod. 1 kHz
19 kHz Pilot ON
5 µV
Check the display SVR 102 Signal "TUNED" and "STEREO" dis-
play must light up
1 mV
AF voltmeter, oscillos-
cope to UR speaker
output via load
resistors
SVR 103 Maximum channel separation
5) Suppression of residual pilot frequencies (19 kHz)
FM signal generator
to 75 ohm
antenna input
Frequency with-
out transmitters
approx. 98 MHz
Tune to approx. 98 MHz
1-2 mV
19 kHz pilot ON
AF voltmeter,
oscilloscope to UR
speaker output
via load resistors
LPF 1 (left channel) Minimum
LPF 2 (right channel)
6) AM oscillator
AM 522 kHz
DC voltmeter
to TP-VT (J 247)
L 101 1.55V DC ± 0.05V
AM 1611 kHz TC 101 8.8 V DC ± 0.2 V
LW 146 kHz
DC voltmeter
to R 131
L102
3.3 V DC ± 0.1V
LW 290 kHz
TC 102 6.5 V DC ± 0.2 V
7) AM IF, input circuit
AM signal
generator
to AM antenna
input
AM 999 kHz
20pV-1 mV, 1 kHz
Mod. 30%.
999 kHz
AF voltmeter
oscilloscope to
UR speaker output
via load resistors
T 103
Maximum
AM 604 kHz 604 kHz L104
AM 1404 kHz 1404 kHz TC 104
LW 153 kHz
153 kHz L103
LW 254 kHz
254 kHz TC 103
Repeat tuning
3