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EC 4790 CD
Adjustment Procedures
Test equipment: DC Voltmeter, Test Generator, AF Voltmeter, Sweep Generator
Adjustment
1. MW Oscillator
MW;
Connect a DC Voltmeter to FMP639.
2. LW Oscillator
LW;
Connect a DC Voltmeter to FMP639.
3. MW Band Pass
Connect a Test Generator to aerial input; MW; Frequency
1404kHz; f
Connect an AF Voltmeter to Loudspeaker Output.
4. LW Band Pass
Connect a Test Generator to aerial input; LW; Frequency
153kHz; f
Connect an AF Voltmeter to Loudspeaker Output.
5. AM IF
Connect a Test Generator to aerial input; MW; Frequency
1008kHz; f
Connect an 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 FMP115.
8. FM Band Pass
Connect a Test Generator to aerial input; Frequency
87.8MHz; f
Connect an AF Voltmeter to Loudspeaker Output.
8. FM IF
Connect a Test Generator to aerial input; Frequency
93.5MHz; f
Connect an AF Voltmeter to Loudspeaker Output.
10. Field Strength
Connect a Test Generator to aerial input; Frequency
Level
93.5MHz; no modulation; E´ = 100µV (40dBµV).
Connect DC Voltmeter between FMP121 (+) and
FMP122 (-).
AM
Kabel
50Ω
37.5Ω
EMK
GRUNDIG Service
Preparation
= 1kHz; m = 30%; E´ = 30µV (30dBµV).
mod
= 1kHz; m = 30%; E´ = 30µV (30dBµV).
mod
= 1kHz; m = 30%; E´ = 30µV (30dBµV).
mod
= 1kHz; dev. 22.5kHz; E´ = 3µV (10dBµV).
mod
= 1kHz; dev. 22.5kHz; E´ = 3µV (10dBµV).
mod
For adjustment use the aerial dummies for AM resp. FM.
E´= EMK - 26dB
E´
55Ω
15pF
Abgleichvorschriften / Adjustment Procedures
Adjustment Procedure
2
Align with L612A
at 531kHz for 1.2V
Check at 1602kHz for 7.5V
3
Align with L613A
at 135kHz for 1.0V
Check at 279kHz for 5.0V
4
Align with L603A
for maximum AF Voltage.
5
Align with L604A
for maximum AF Voltage.
1
Align with F601A
for maximum AF Voltage.
7
Align with L04
at 93.5MHz for 2.85V
!
Align F105
for a symmetrical stop impulse.
+5V
0V
∆f = ± 25kHz
Align alternating with L03
AF Voltage.
8
Align with F101
for maximum AF Voltage.
6
Align with CR105
for +425mV
FM
Kabel
50Ω
10Ω
EMK
±
20mV.
±
0.5V.
±
20mV.
±
0.5V.
±
20mV.
93.5MHz
0
9
and L01
for maximum
±
20mV.
E´= EMK - 6dB
E´
45Ω
10nF
2 - 2
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