Einstellvorschriften / Adjustment Procedures
RR 3200 CD / RR 3500 CD
2 - 5
GRUNDIG Service
3. Tuner
Measuring instruments: Signal Generator, Sweep Generator, Oscilloscope, Frequncy Counter.
Function switch: Radio
Alignment scheme see page 2 - 3.
Adjustment
Preparations
Adjustment Process
Adjust T101 and T102 to maximum.
Repeat this adjustment.
At f
u
(526.5kHz) adjust to maximum with T104.
At f
o
(1606.5kHz) adjust to maximum with TC4.
Repeat this adjustment.
At 600kHz
adjust to maximum with L101 (MW antenna coil
move).
At 1400kHz
adjust to maximum with TC3.
Repeat this adjustment.
At f
u
(148.5kHz) adjust to maximum with T103.
At f
o
(283.5kHz) adjust to maximum with TC102.
Repeat this adjustment.
At 160kHz
adjust to maximum with L102 (LW antenna coil
move).
At 275kHz
adjust to maximum with TC101.
Repeat this adjustment.
At f
u
(87.5MHz) adjust to maximum with L103.
At f
o
(108MHz) adjust to maximum with TC2.
Repeat this adjustment.
At 90MHz
adjust to maximum with L105 (bend).
At 106MHz adjust to maximum with TC1.
Repeat this adjustment.
Set the frequency to 152kHz
±
100Hz with VR101.
Couple in a sweep signal of 468kHz via a 10nF capacitor
to testpoint
A
.
Oscilloscope to testpoint
1
.
Band switch: MW
Var. capacitor to limit stop: MW f
u
526.5kHz, f
o
1606.5kHz
Couple in a standard signal to ferrite aerial via a loop
aerial
B
, (f
mod
= 1kHz, m = 30%, U
a
as low as possible).
Oscilloscope to testpoint
1
.
Band switch: MW
MW 600kHz, MW 1400kHz
Couple in a standard signal to ferrite aerial via a loop
aerial
B
, (f
mod
= 1kHz, m = 30%, U
a
as low as possible).
Oscilloscope to testpoint
1
.
Band switch: MW
Var. capacitor to limit stop: LW f
u
148.5kHz, f
o
283.5kHz
Couple in a standard signal to ferrite aerial via a loop
aerial
B
, (f
mod
= 1kHz, m = 30%, U
a
as low as possible).
Oscilloscope to testpoint
1
.
Band switch: LW
LW 160kHz, LW 275kHz
Couple in a standard signal at to ferrite aerial via a loop
aerial
B
, (f
mod
= 1kHz, m = 30%, Ua <).
Oscilloscope to testpoint
1
.
Band switch: LW
Var. capacitor to limit stop: FM f
u
87.5MHz, f
o
108MHz
Couple in a standard signal via a 10nF capacitor to (FM
ant.) testpoint
C
, (f
mod
= 1kHz,
∆
f = 22.5kHz, U
a
as low as
possible).
Oscilloscope to testpoint
1
.
Band switch: FM
FM 90MHz, FM 106MHz
Couple in a standard signal via a 10nF capacitor to (FM
ant.) testpoint
C
, (f
mod
= 1kHz,
∆
f = 22.5kHz, U
a
as low as
possible).
Oscilloscope to testpoint
1
.
Band switch: FM
Couple in a standard signal of 98MHz, unmodulated via
a 10nF capacitor to (FM ant.) testpoint
C
.
Frequency counter to testpoint
D
.
Band switch: FM
1. AM IF
2. MW Oscillator
3. MW Aerial
bandpass
4. LW Oscillator
5. LW Aerial
bandpass
6. FM Oscillator
7. FM Aerial
bandpass
8. FM MPX (Stereo)
