EC 4000 RDSAbgleichvorschriften / Adjustment Procedures
GB Adjustment Procedures
1. Electrical Adjustment
Test equipment: DC Voltmeter, Test Generator, AF Voltmeter, Stereo Coder, Sweep Generator
AdjustmentPreparation Adjustment Procedure
1. MW OscillatorMW ;Align with L 612 (2) at 531kHz to 1.2V? 20mV .
Connect a DC Voltmeter to FMP639 .Check at 1602kHz for 7.5V ? 0.5V.
2. LW OscillatorLW; Frequency 153kHz.Align with L 613 (3) at 153kHz to 1.0V ? 20mV.
Connect a DC Voltmeter to FMP639 .Check at 279kHz for 5.0V ? 0.5V.
3. MW Band PassConnect a Test Generator to aerial input; MW; FrequencyAlign with L 603 (4) for maximum AF output.
1404kHz; m = 0.3; fmod =1 kHz; E? ? 30mV (30dBmV).
Connect AF Voltmeter to Loudspeaker Output.
4. LW Band PassConnect a Test Generator to aerial input; LW; FrequencyAlign with L 604 (5) for maximum AF output.
153kHz; m = 0.3; fmod =1 kHz; E? ? 30mV (30dBmV).
Connect AF Voltmeter to Loudspeaker Output.
5. AM IFConnect a Test Generator to aerial input; MW; FrequencyAlign with F 601 (1) for maximum AF output.
1008kHz; m = 0,3; f = 1kHz; E? ? 30mV (30dBmV).
mod
Connect AF Voltmeter to Loudspeaker Output.
6. FM OscillatorFM;Align with L 04 (7) at 93.5MHz for 2.85V? 20mV .
Connect a DC Voltmeter to FMP24 .
7. FM Stop GeneratorConnect a Sweep Generator to aerial input; FM; CenterAlign F 105 (I) for a symmetrical stop impulse.
frequency 93.5MHz; Df = 100kHz; E? ? 1mV (60dBmV); no93,5MHz
modulation.+5V
Connect an Oscilloscope to FMP107.
0V
Df = ? 25kHz
8. FM Band PassConnect a Test Generator to aerial input; FrequencyAlign alternating with L 03 (10) and L 01 (9) for AF
87.8MHz; f = 1kHz; dev. 22.5kHz; E? ? 3mV (10dBmV).maximum .
mod
Connect AF Voltmeter to Loudspeaker Output.
9. FM IFConnect a Test Generator to aerial input; FrequencyAlign with F 101 (8) for AF maximum .
93.5MHz; fmod = 1kHz; dev. 22.5kHz; E? ? 3mV (10dBmV).
Connect AF Voltmeter to Loudspeaker Output.
10. Field StrengthConnect a Test Generator to aerial input; FrequencyAlign with CR 105 (6) for +425V ? 20mV .
Level93.5MHz; E? = 100mV (40dBmV); no modulation.
Connect DC Voltmeter between FMP121 (+) and FMP122 (-).
2. Adjustment of Cassette Drive
Test equipment: Frequency Counter, Test Cassette 448A (Sach-Nr. 35079-023.00)
AdjustmentPreparation Adjustment Procedure
Tape SpeedConnect Frequency Counter to Loudspeaker Output.With Motorpoti adjust for 3150Hz.
Play Test Cassette 448A (3150Hz part).
Motorpoti
GRUNDIG Service2 - 2 |
ACEC
