Grundig RR 630 CD Serviceanleitung Seite 12

Abgleichvorschriften / Adjustment Procedures
2. Tuner
Measuring instruments: Signal generator, sweep generator, oscilloscope, frequency counter.
Function switch: Radio
Adjustment
1. AM IF Couple in a sweep signal of 465kHz to L506 (ferrite aerial)
via a loop aerial.
Oscilloscope to testpoint
Band switch: MW
2. MW Oscillator Var. capacitor to limit stop: MW f
Couple in a standard signal to L506 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to testpoint
Band switch: MW
3. MW Aerial MW 558kHz, MW 1440kHz
bandpass Couple in a standard signal to L506 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to testpoint
Band switch: MW
4. LW Oscillator Var. capacitor to limit stop: f
Couple in a standard signal to L507 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to testpoint
Band switch: LW
5. LW Aerial LW 153kHz, LW 261kHz
bandpass Couple in a standard signal to L507 (ferrite aerial) via a
loop aerial, (f
that the signal is just visible).
Oscilloscope to testpoint
Band switch: LW
6. FM Oscillator Var. capacitor to limit stop: FM f
Couple in a standard signal via a 10nF capacitor to
testpoint
as low as possible so that the signal is just visible).
Oscilloscope to testpoint
Band switch: FM
7. FM Aerial FM 88MHz, FM 106MHz
bandpass Couple in a standard signal via a 10nF capacitor to
testpoint
as low as possible so that the signal is just visible).
Oscilloscope to testpoint
Band switch: FM
8. FM MPX (Stereo) Standard signal none
Short-circuit IC501 between Pin 1 and Pin 29.
Frequency counter to test point
Band switch: FM
2 - 4
Preparations
/ (IC501 Pin 5/6).
TP 6 TP 7
515kHz, f
u
= 1kHz, m = 30%, U as low as possible so
a
mod
/ (IC501 Pin 5/6).
TP 6 TP 7
= 1kHz, m = 30%, U as low as possible so
a
mod
/ (IC501 Pin 5/6).
TP 6
TP 7
292kHz
o
= 1kHz, m = 30%, U as low as possible so
a
mod
/ (IC501 Pin 5/6).
TP 6 TP 7
= 1kHz, m = 30%, U as low as possible so
mod a
/ (IC501 Pin 5/6).
TP 6 TP 7
87.35MHz, f
u
= 1kHz, ∆f = 22.5kHz, U
/ (GND) (f
TP 1 TP 2
mod
/ (IC501 Pin 5/6).
TP 6 TP 7
= 1kHz, ∆f = 22.5kHz, U
/ (GND) (f
TP 1 TP 2
mod
/ (IC501 Pin 5/6).
TP 6 TP 7
(IC501 Pin 4).
TP 5
TP 6
TP 7
TP 5
TP 2
Adjust to maximum with T501.
1630kHz At f (515kHz) adjust to maximum with L504.
o u
At f (1630kHz) adjust to maximum with VTC501(B).
o
Repeat this adjustment alternately.
At 558kHz adjust to maximum with L506 (MW aerial coil,
move).
At 1440kHz adjust to maximum with VCT501(A).
Repeat this adjustment alternately.
At f (292kHz) adjust to maximum with TC502.
o
At 153kHz adjust to maximum with L507 (LW aerial coil,
move).
At 261kHz adjust to maximum with TC501.
Repeat this adjustment alternately.
108.25MHz At f (87.35MHz) adjust to maximum with L503.
o u
At f (108.25MHz) adjust to maximum with VCT501(C).
o
Repeat this adjustment alternately.
a
At 88MHz adjust to maximum with L502 (bend).
At 106MHz adjust to maximum with VCT501(D).
Repeat this adjustment alternately.
a
Set the frequency to 76kHz ± 100Hz with VR501.
TP 1
RR 630 CD / RR 660 CD
Adjustment Process
GRUNDIG Service