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RR 640 CD / RR 670 CD
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
GRUNDIG Service
Preparations
/
TP 6
TP 7
515kHz, f
u
= 1kHz, m = 30%, U
as low as possible so
a
mod
/
TP 6
TP 7
= 1kHz, m = 30%, U
as low as possible so
a
mod
/
TP 6
TP 7
292kHz
o
= 1kHz, m = 30%, U
as low as possible so
a
mod
/
TP 6
TP 7
= 1kHz, m = 30%, U
as low as possible so
mod
a
/
TP 6
TP 7
87.35MHz, f
u
= 1kHz, ∆f = 22.5kHz, U
/
(GND) (f
TP 2
TP 1
mod
/
TP 6
TP 7
= 1kHz, ∆f = 22.5kHz, U
/
(GND) (f
TP 1
TP 2
mod
/
TP 6
TP 7
(IC501 Pin 4).
TP 5
TP 6
TP 7
TP 5
TP 2
Adjust to maximum with T501.
(CN501 Pin 1/3).
1630kHz
At f
(515kHz) adjust to maximum with L504.
o
u
At f
(1630kHz) adjust to maximum with VCT501(B).
o
Repeat this adjustment alternately.
(CN501 Pin 1/3).
At 558kHz adjust to maximum with L506 (MW aerial coil,
move).
At 1440kHz adjust to maximum with VCT501(A).
Repeat this adjustment alternately.
(CN501 Pin 1/3).
At f
(292kHz) adjust to maximum with TC502.
o
(CN501 Pin 1/3).
At 153kHz adjust to maximum with L507 (LW aerial coil,
move).
At 261kHz adjust to maximum with TC501.
Repeat this adjustment alternately.
(CN501 Pin 1/3).
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
(CN501 Pin 1/3).
At 88MHz adjust to maximum with L502 (bend).
At 106MHz adjust to maximum with VCT501(D).
Repeat this adjustment alternately.
a
(CN501 Pin 1/3).
Set the frequency to 76kHz ± 100Hz with VR501.
TP 1
Abgleichvorschriften / Adjustment Procedures
Adjustment Process
2 - 4
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