Adjustment Procedures; Main Board - Grundig Ec 4600 Rds Serviceanleitung

EC 4600 RDS

Adjustment Procedures

1. Main Board

Test equipment: DC Voltmeter, Test Generator, AF Voltmeter, Sweep Generator, Test Cassette 448A (Part-No 35079-023.00)
Adjustment
1. MW Oscillator
2. LW Oscillator
3. MW Band Pass
4. LW Band Pass
5. AM IF
6. FM Oscillator
7. FM Stop Generator
8. FM Band Pass
8. FM IF
10. Field Strength
Level
11. Dolby
2. Cassette Drives
Test equipment: AF Voltmeter, Frequency Counter, Test Cassette 448A (Sach-Nr. 35079-023.00)
Adjustment
1. Tape Speed
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Preparation
MW;
Connect a DC Voltmeter to FMP639.
LW;
Connect a DC Voltmeter to FMP639.
Connect a Test Generator to aerial input; MW; Frequency
1404kHz; f = 1kHz; m = 30%; E´ = 30µV (30dBµV).
mod
Connect an AF Voltmeter to Loudspeaker Output.
Connect a Test Generator to aerial input; LW; Frequency
153kHz; f = 1kHz; m = 30%; E´ = 30µV (30dBµV).
mod
Connect an AF Voltmeter to Loudspeaker Output.
Connect a Test Generator to aerial input; MW; Frequency
1008kHz; f = 1kHz; m = 30%; E´ = 30µV (30dBµV).
mod
Connect an AF Voltmeter to Loudspeaker Output.
FM;
Connect a DC Voltmeter to FMP24.
Connect a Sweep Generator to aerial input; FM; Center
frequency 93.5MHz; ∆f = 100kHz; E´ = 1mV (60dBµV); no
modulation.
Connect an Oscilloscope to FMP115.
Connect a Test Generator to aerial input; Frequency
87.8MHz; f = 1kHz; dev. 22.5kHz; E´ = 3µV (10dBµV).
mod
Connect an AF Voltmeter to Loudspeaker Output.
Connect a Test Generator to aerial input; Frequency
93.5MHz; f = 1kHz; dev. 22.5kHz; E´ = 3µV (10dBµV).
mod
Connect an AF Voltmeter to Loudspeaker Output.
Connect a Test Generator to aerial input; Frequency
93.5MHz; no modulation; E´ = 100µV (40dBµV).
Connect DC Voltmeter between FMP121 (+) and
FMP122 (-).
Play Test Cassette 448A (315Hz Dolby part).
Connect AF Voltmeter to FMP1119 (left channel) resp.
FMP1124 (right channel).
Preparation
Connect Frequency Counter to Loudspeaker Output.
Play Test Cassette 448A (3150Hz part).
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Adjustment Procedure
2
Align with L612 at 531kHz for 1.2V
±
Check at 1602kHz for 7.5V 0.5V.
3
Align with L613 at 135kHz for 1.0V
±
Check at 279kHz for 5.0V 0.5V.
4
Align with L603 for maximum AF Voltage.
5
Align with L604 for maximum AF Voltage.
1
Align with F601 for maximum AF Voltage.
7
Align with L04 at 93.5MHz for 2.85V
!
Align F105 for a symmetrical stop impulse.
93.5MHz
+5V
0V
∆f = ± 25kHz
0
Align alternating with L03 and L01
AF Voltage.
8
Align with F101 for maximum AF Voltage.
±
Align with CR105 for +425mV 20mV.
Adjust CR1109 for the left channel resp. CR1133 for the
right channel for 490mV.
Adjustment Procedure
With Motorpoti adjust for 3150Hz.
±
20mV.
±
20mV.
±
20mV.
9
for maximum
Motorpoti
PCB
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