GRUNDIG RR430 CD
Manual de Servicio

RR 430 CD

Abgleichvorschriften / Adjustment Procedures

2. Tuner
Measuring instruments: Signal generator, sweep generator, oscilloscope. Function switch: Radio Adjustment 1. AM IF Preparations Couple in a sweep signal of 455kHz to L504 (ferrite aerial) via a loop aerial. Oscilloscope to testpoint TP 5 (IC501 Pin 7). Band switch: MW MW fu 515kHz, fo 1630kHz Couple in a standard signal to L504 (ferrite aerial) via a loop aerial, (fmod = 1kHz, m = 30%, Ua as low as possible so that the signal is just visible). Oscilloscope to the headphone socket. Band switch: MW MW 558kHz, MW 1440kHz Couple in a standard signal to L504 (ferrite aerial) via a loop aerial, (fmod = 1kHz, m = 30%, Ua as low as possible so that the signal is just visible). Oscilloscope to the headphone socket. Band switch: MW LW fu 142kHz, fo 292kHz Couple in a standard signal to L505 (ferrite aerial) via a loop aerial, (fmod = 1kHz, m = 30%, Ua as low as possible so that the signal is just visible). Oscilloscope to the headphone socket. Band switch: LW LW 153kHz, LW 261kHz Couple in a standard signal to L505 (ferrite aerial) via a loop aerial, (fmod = 1kHz, m = 30%, Ua as low as possible so that the signal is just visible). Oscilloscope to the headphone socket. Band switch: LW FM fu 87.35MHz, fo 108,25MHz Couple in a standard signal via a 10nF capacitor to testpoint TP 1 / TP 2 (GND) (fmod = 1kHz, �f = 22.5kHz, Ua as low as possible so that the signal is just visible). Oscilloscope to the headphone socket. Band switch: FM FM 88MHz, FM 106MHz Couple in a standard signal via a 10nF capacitor to testpoint TP 1 / TP 2 (GND) (fmod = 1kHz, �f = 22.5kHz, Ua as low as possible so that the signal is just visible). Oscilloscope to the headphone socket. Band switch: FM Adjustment Process Adjust to maximum with T501.

2. MW Oscillator

At tuning minimum (515kHz) adjust with T502 and at tuning maximum (1630kHz) adjust with VC501-C to maximum output. Repeat this adjustment alternately.

3. MW Aerial bandpass

At 558kHz adjust to maximum with L504 (MW aerial coil, move). At 1440kHz adjust to maximum with VC501-D. Repeat this adjustment alternately.

4. LW Oscillator

At tuning maximum (292kHz) adjust with TC502 to maximum output.

5. LW Aerial bandpass

At 153kHz adjust to maximum with L505 (LW aerial coil, move). At 261kHz adjust to maximum with TC501. Repeat this adjustment alternately.

7. FM Oscillator

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.

8. FM Aerial bandpass

At 88MHz adjust to maximum with L503 (bend). At 106MHz adjust to maximum with VC501-B. Repeat this adjustment alternately.

L504

L505

VC501

B A

C D
TP 1 TP 2

TC501 L502 L503 T501 TC502 T502

TP 5

GRUNDIG Service

2-3