Grundig RR 620 CD Servicehandbuch Seite 14

Einstellvorschriften / Adjustment Procedures
3. Tuner
Measuring instruments: Signal Generator, Sweep Generator, Oscilloscope, Frequncy Counter.
Function switch: Radio
Alignment scheme see page 2 - 3.
Adjustment
1. AM IF Couple in a sweep signal of 465kHz to ferrite aerial via a
loop aerial.
Oscilloscope to the headphone socket.
Band switch: MW
2. MW Oscillator Var. capacitor to limit stop: MW f
Couple in a standard signal to ferrite aerial via a loop
aerial, (f
Oscilloscope to the headphone socket.
Band switch: MW
3. MW Aerial MW 610kHz, MW 1400kHz
bandpass Couple in a standard signal to ferrite aerial via a loop
aerial, (f
Oscilloscope to the headphone socket.
Band switch: MW
4. LW Oscillator Var. capacitor to limit stop: LW f
Couple in a standard signal to ferrite aerial via a loop
aerial, (f
Oscilloscope to the headphone socket.
Band switch: LW
5. LW Aerial LW 160kHz, LW 280kHz
bandpass Couple in a standard signal at to ferrite aerial via a loop
aerial, (f
Oscilloscope to the headphone socket.
Band switch: LW
6. FM IF Feed in a 10.7MHz sweep signal to TP3 (FM ant.).
Oscilloscope to TP2 (IC302, Pin9).
Band switch: FM
7. FM Oscillator Var. capacitor to limit stop: FM f
Couple in a standard signal to TP3 (FM ant.),
= 1kHz, ∆f = 22.5kHz).
(f
mod
Oscilloscope to the headphone socket.
Band switch: FM
8. FM Aerial FM 90MHz, FM 106MHz
bandpass Couple in the standard signal to TP3 (FM ant.),
= 1kHz, ∆f = 22.5kHz).
(f
mod
Oscilloscope to the headphone socket.
Band switch: FM
9. FM MPX (Stereo) Couple in a standard signal of 98MHz, unmodulated to
TP3 (FM ant.).
Frequency counter to TP5.
Band switch: FM
2 - 5
Preparations
526.5kHz, f
u
= 1kHz, m = 30%).
mod
= 1kHz, m = 30%).
mod
148.5kHz, f
u
= 1kHz, m = 30%).
mod
= 1kHz, m = 30%).
mod
87.5MHz, f
u
Adjust T302 to maximum.
1606.5kHz At f (526.5kHz) adjust to maximum with T305.
o u
At f (1606.5kHz) adjust to maximum with TC4.
o
Repeat this adjustment.
At 610kHz adjust to maximum with MW antenna coil.
At 1400kHz adjust to maximum with TC3.
Repeat this adjustment.
283.5kHz At f (148.5kHz) adjust to maximum with T304.
o u
At f (283.5kHz) adjust to maximum with TC302.
o
Repeat this adjustment.
At 160kHz adjust to maximum with LW antenna coil.
At 280kHz adjust to maximum with TC301.
Repeat this adjustment.
With T301 and T303 adjust to maximum and symmetry.
108MHz At f (87.5MHz) adjust to maximum with L303.
o u
At f (108MHz) adjust to maximum with TC1.
o
Repeat this adjustment.
At 90MHz adjust to maximum with L302.
At 106MHz adjust to maximum with TC2.
Repeat this adjustment.
Set the frequency to 76kHz ± 100Hz with VR301.
RR 620 CD / RR 650 CD
Adjustment Process
GRUNDIG Service