Dual CR 5950 RC Serviceanleitung Seite 3

Tuning Instructions for CR 5950
Signal source Equipment Signal source setting Connection of Item to be tuned Tuning, Remarks
setting measuringinstrument
FM oscillator
87.5 MHz DC voltmeter to: L 106 17VDO+0.1V
E2-2
108 MHz CT 104 90VDC£01V
Repeat tuning
ЕМІР, input circuit
FMsignalgeneratorto | Monokey:ON | 0-1mV Harmonic detector L107
75-ohm Frequency with- | Shift + 40 kHz oscilloscope to ША AF maximum
antenna input outtransmitters | Mod. 1 kHz
speaker output via
L161A
Tune to approx load resistors
approx.98MHz | 98 MHz
АЕ and harmonic distortion
L161B minimum
90 MHz Tune to app. 90 MHz L102, L 103, L 104 AF maximum at
- min. noise
105 MHz Tune to app. 105 MHz C 101, C 102, C 103
Repeat input-circuit tuning
FM IF (fine tuning)
Antenna to
Receive strong
DC voltmeter to:
Determine DC maximum
75-ohm FM transmitter. ПРА ЗТРО L161B and DC minimum
antenna input atits nominal —
frequency
L161B Adjust power mean
`
|
L161A
0V£1mVDC
Repeat tuning
Transition between monaural, stereo and mi uting; 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
δμν
1mV
AF voltmeter,
oscilloscope to
L/R speaker output
via load resistors
Set monaural, stereo
VR161 and muting transition
VR 162 Third signal LED must light up.
VR201 Maximum channel separation
Suppression of residual pilot frequencies (19 kHz)
FMsignalgeneratorto | Frequencywith- | Tunetoapprox.98 MHz | AF voltmeter,
75-ohm outtransmiters | 1-2mV, oscilloscope to L/R 1.201 (left channel)
antenna input approx. 98 MHz | 19-kHz pilot ON speaker output [— — — — ——] Minimum
Mono key: OFF
Via load resistors
L 202 (right channel)
LPF (114 kHz)
AF generator OFF 114kHz Oscilloscope L164 Minimum
1 VpptoR 172 to C 181
AM oscillator
522 kHz DC voltmeter to 1152 14VDO# 0.1 V
E2-2 =
1611 kHz C152 10V DC олу
АМІЕ, input circuit
AM signal generator to 10 pV- 1 mV, 1 kHz, AF voltmeter,
AM antenna input Mod. 30% oscilloscope to L/R L163 Maximum
999 kHz 999 kHz speaker output via
— | load resistors —
594 kHz 594 kHz L151
1404 kHz 1404 kHz CT 151
AF closed-circuit current
DC voltmeter to:
Volume: min. TP1-TP3 VR801 After 5 min, 4 mV
TP2-TP4 VR 802 ату