EC 4600 RDS
Abgleichvorschriften / Adjustment Procedures
GRUNDIG Service
2 - 2
k
Adjustment Procedures
1. Main Board
Test equipment: DC Voltmeter, Test Generator, AF Voltmeter, Sweep Generator, Test Cassette 448A (Part-No 35079-023.00)
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
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
mod
= 1kHz; m = 30%; E´ = 30
µ
V (30dB
µ
V).
Connect an AF Voltmeter to Loudspeaker Output.
Connect a Test Generator to aerial input; LW; Frequency
153kHz; f
mod
= 1kHz; m = 30%; E´ = 30
µ
V (30dB
µ
V).
Connect an AF Voltmeter to Loudspeaker Output.
Connect a Test Generator to aerial input; MW; Frequency
1008kHz; f
mod
= 1kHz; m = 30%; E´ = 30
µ
V (30dB
µ
V).
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 (60dB
µ
V); no
modulation.
Connect an Oscilloscope to FMP115.
Connect a Test Generator to aerial input; Frequency
87.8MHz; f
mod
= 1kHz; dev. 22.5kHz; E´ = 3
µ
V (10dB
µ
V).
Connect an AF Voltmeter to Loudspeaker Output.
Connect a Test Generator to aerial input; Frequency
93.5MHz; f
mod
= 1kHz; dev. 22.5kHz; E´ = 3
µ
V (10dB
µ
V).
Connect an AF Voltmeter to Loudspeaker Output.
Connect a Test Generator to aerial input; Frequency
93.5MHz; no modulation; E´ = 100
µ
V (40dB
µ
V).
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).
Align with L612
2
at 531kHz for 1.2V
±
20mV.
Check at 1602kHz for 7.5V
±
0.5V.
Align with L613
3
at 135kHz for 1.0V
±
20mV.
Check at 279kHz for 5.0V
±
0.5V.
Align with L603
4
for maximum AF Voltage.
Align with L604
5
for maximum AF Voltage.
Align with F601
1
for maximum AF Voltage.
Align with L04
7
at 93.5MHz for 2.85V
±
20mV.
Align F105
!
for a symmetrical stop impulse.
93.5MHz
+5V
0V
∆
f =
±
25kHz
Align alternating with L03
0
and L01
9
for maximum
AF Voltage.
Align with F101
8
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
Preparation
Adjustment Procedure
1. Tape Speed
Connect Frequency Counter to Loudspeaker Output.
Play Test Cassette 448A (3150Hz part).
With Motorpoti adjust for 3150Hz.
Motorpoti
PCB
2. Cassette Drives
Test equipment: AF Voltmeter, Frequency Counter, Test Cassette 448A (Sach-Nr. 35079-023.00)
Adjustment
Preparation
Adjustment Procedure
