Adjustment Procedures - Grundig FREAXX 50 RRCD 4305 SPCD Bedienungsanleitung

GRUNDIG Service

Adjustment Procedures

1. Tuner
Test equipment: Signal Generator, Digital Voltmeter
Adjustment
1. LW Oscillator Digital Voltmeter to Testpoint TP3.
2. MW Oscillator Digital Voltmeter to Testpoint TP3.
3. AM IF Couple Signal Generator via Loop Antenna.
f = 450kHz; no modulation
Digital Voltmeter to Testpoint TP4.
4. LW Pre Stage Couple Signal Generator via Loop Antenna.
no modulation
Digital Voltmeter to Testpoint TP4.
5. MW Pre Stage Couple Signal Generator via Loop Antenna.
no modulation
Digital Voltmeter to Testpoint TP4.
6. FM Oscillator Digital Voltmeter to Testpoint TP3.
7. FM Pre Stage Signal Generator to Aerial Input (TP1 / TP2 Ground);
no modulation
Digital Voltmeter to Testpoint TP4.
Preparation
2 - 3
FREAXX 50 RRCD 4305 SPCD
Adjustment Procedure
At 281kHz adjust T502 for 7.0V
At 1620kHz adjust T501 for 8.5V
Adjust T509 for maximum.
Adjust alternating with LW COIL (on the ferrite antenna) at
153kHz and with VC503 at 261kHz for maximum.
Adjust alternating with MW COIL (on the ferrite antenna)
at 558kHz and with VC502 at 1440kHz for maximum.
At 108.0MHz adjust (bend) L502 for 7.2V
Adjust alternating with L501 (bend) at 88.0MHz and with
VC501 at 106.0MHz for AF Maximum.
±
0.2V.
±
0.2V.
±
0.2V.