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