Grundig RR 430 CD Betriebsanleitung Seite 9

RR 430 CD
2. Tuner
Measuring instruments: Signal generator, sweep generator, oscilloscope.
Function switch: Radio
Adjustment
1. AM IF Couple in a sweep signal of 455kHz to L504 (ferrite aerial)
via a loop aerial.
Oscilloscope to testpoint
Band switch: MW
2. MW Oscillator MW f
u
Couple in a standard signal to L504 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to the headphone socket.
Band switch: MW
3. MW Aerial MW 558kHz, MW 1440kHz
bandpass Couple in a standard signal to L504 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to the headphone socket.
Band switch: MW
4. LW Oscillator LW f 142kHz, f
u
Couple in a standard signal to L505 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to the headphone socket.
Band switch: LW
5. LW Aerial LW 153kHz, LW 261kHz
bandpass Couple in a standard signal to L505 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to the headphone socket.
Band switch: LW
7. FM Oscillator FM f 87.35MHz, f
u
Couple in a standard signal via a 10nF capacitor to
testpoint
U as low as possible so that the signal is just visible).
a
Oscilloscope to the headphone socket.
Band switch: FM
8. FM Aerial FM 88MHz, FM 106MHz
bandpass Couple in a standard signal via a 10nF capacitor to
testpoint
U as low as possible so that the signal is just visible).
a
Oscilloscope to the headphone socket.
Band switch: FM
VC501
GRUNDIG Service
Preparations
(IC501 Pin 7).
TP 5
515kHz, f 1630kHz
o
= 1kHz, m = 30%, U as low as possible so
a
mod
= 1kHz, m = 30%, U as low as possible so
a
mod
292kHz
o
= 1kHz, m = 30%, U as low as possible so
a
mod
= 1kHz, m = 30%, U as low as possible so
mod a
108,25MHz
o
= 1kHz, ∆f = 22.5kHz,
/ (GND) (f
TP 1 TP 2
mod
= 1kHz, ∆f = 22.5kHz,
/ (GND) (f
TP 1 TP 2
mod
C
B
D
A
TP 1
TP 2
TP 5
Adjust to maximum with T501.
At tuning minimum (515kHz) adjust with T502 and at
tuning maximum (1630kHz) adjust with VC501-C to
maximum output.
Repeat this adjustment alternately.
At 558kHz adjust to maximum with L504 (MW aerial coil,
move).
At 1440kHz adjust to maximum with VC501-D.
Repeat this adjustment alternately.
At tuning maximum (292kHz) adjust with TC502 to
maximum output.
At 153kHz adjust to maximum with L505 (LW aerial coil,
move).
At 261kHz adjust to maximum with TC501.
Repeat this adjustment alternately.
At tuning minimum (87,35MHz) adjust with L502 and at
tuning maximum (108,25MHz) adjust with VC501-A to
maximum output.
Repeat this adjustment alternately.
At 88MHz adjust to maximum with L503 (bend).
At 106MHz adjust to maximum with VC501-B.
Repeat this adjustment alternately.
L504
TC501
L502
TC502
L503
T502
T501
Abgleichvorschriften / Adjustment Procedures
Adjustment Process
L505
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