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EC 4000 RDS
Adjustment Procedures
GB
1. Electrical Adjustment
Test equipment: DC Voltmeter, Test Generator, AF Voltmeter, Stereo Coder, Sweep Generator
Adjustment
1. MW Oscillator
MW;
Connect a DC Voltmeter to FMP639.
2. LW Oscillator
LW; Frequency 153kHz.
Connect a DC Voltmeter to FMP639.
3. MW Band Pass
Connect a Test Generator to aerial input; MW; Frequency
1404kHz; m = 0.3; f
Connect AF Voltmeter to Loudspeaker Output.
4. LW Band Pass
Connect a Test Generator to aerial input; LW; Frequency
153kHz; m = 0.3; f
Connect AF Voltmeter to Loudspeaker Output.
5. AM IF
Connect a Test Generator to aerial input; MW; Frequency
1008kHz; m = 0,3; f
Connect AF Voltmeter to Loudspeaker Output.
6. FM Oscillator
FM;
Connect a DC Voltmeter to FMP24.
7. FM Stop Generator
Connect a Sweep Generator to aerial input; FM; Center
frequency 93.5MHz; ∆f = 100kHz; E´ ≈ 1mV (60dBµV); no
modulation.
Connect an Oscilloscope to FMP107.
8. FM Band Pass
Connect a Test Generator to aerial input; Frequency
87.8MHz; f
Connect AF Voltmeter to Loudspeaker Output.
9. FM IF
Connect a Test Generator to aerial input; Frequency
93.5MHz; f
Connect AF Voltmeter to Loudspeaker Output.
10. Field Strength
Connect a Test Generator to aerial input; Frequency
Level
93.5MHz; E´ = 100µV (40dBµV); 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)
Adjustment
Tape Speed
Connect Frequency Counter to Loudspeaker Output.
Play Test Cassette 448A (3150Hz part).
GRUNDIG Service
Preparation
=1 kHz; E´ ≈ 30µV (30dBµV).
mod
=1 kHz; E´ ≈ 30µV (30dBµV).
mod
= 1kHz; E´ ≈ 30µV (30dBµV).
mod
= 1kHz; dev. 22.5kHz; E´ ≈ 3µV (10dBµV).
mod
= 1kHz; dev. 22.5kHz; E´ ≈ 3µV (10dBµV).
mod
Preparation
Abgleichvorschriften / Adjustment Procedures
Adjustment Procedure
Align with L 612 (2) at 531kHz to 1.2V
±
Check at 1602kHz for 7.5V
0.5V.
Align with L 613 (3) at 153kHz to 1.0V
±
Check at 279kHz for 5.0V
0.5V.
Align with L 603 (4) for maximum AF output.
Align with L 604 (5) for maximum AF output.
Align with F 601 (1) for maximum AF output.
Align with L 04 (7) at 93.5MHz for 2.85V
Align F 105 (I) for a symmetrical stop impulse.
93,5MHz
+5V
0V
∆f = ± 25kHz
Align alternating with L 03 (10) and L 01 (9) for AF
maximum.
Align with F 101 (8) for AF maximum.
Align with CR 105 (6) for +425V
Adjustment Procedure
With Motorpoti adjust for 3150Hz.
±
20mV.
±
20mV.
±
20mV.
±
20mV.
Motorpoti
2 - 2
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