Grundig 6400 RDS Servicehandbuch Seite 4

ia at SS oS
Abgileichvorschriften / Adjustment Procedures 6400 RDS /6500 RDS
Adjustment Procedures
1. Electrical Adjustment
Test equipment:
DC Voltmeter, Frequency Counter, Test Generator, AF Voltmeter, Sweep Generator, Oscilloscope, Stereo Coder, Test Cassette 448A (Part-No.
35079-023.00)
6400 RDS: Only Adjustments 1... 13.
1. MW Oscillator MW; Adjust alternating with C 628) at 1605kHz for 8.0V + 50mV
Connect DC Voltmeter to MP 2. and with L 608 (2) at 528kHz for 1.2V + 50mvV.
2. LW Oscillator LW; Frequency 150kHz. Adjust with L 609 G) for 1.0V +50mvV.
Connect DC Voltmeter to MP 2.
3. MW Band Pass Connect Test Generator to Aerial Input; Adjust alternating with C 609 (6) at 1548kHz and with
MW; m = 0,3; fg=1 KHz; E° < 10uV (20dByV). L 606 (6) at 558kHz for Maximum.
Connect AF Voltmeter to Loudspeaker Output.
4. LW Band Pass
5. AM Fieldstrength
for Stop Generator
Adjust alternating with C 611 @) at 261kHz and. with
Connect Test Generator to Aerial Input;
L 607 (8) at 162kHz for Maximum.
LW; m = 0,3; frig =1 KHz; E" < 10nV (20dBuV).
Connect AF Voltmeter to Loudspeaker Output.
Connect Test Generator to Aerial Input; Adjust with R 644 G0) for 1.05V +10mV.
Frequency 990kHz; E' = 100. V (40dBuV); no Modulation.
Connect DC-Voltmeter to MP 4.
With F 109 (1) adjust for a symmetric signal.
6. AM Stop Generator | Connect Sweep Generator to Aerial Input;
Center Frequency 990kHz; E' = 1mV (60dBuV); no Modu- 990kHz
lation. +5V
Connect Oscilloscope to MP 13. |
ov—- |; }
'Af = + 1kHz
Adjust with L 04 (8) at 93.0MHz for 2.8V + 20mvV.
7. FM Oscillator
Anise DC Voltmeter to MP 1.
8. FM IF Connect Test Generator to Aerial Input;
Frequency 93.0MHz; E° = 10uV (20dBuV); no Modulation.
Connect DC Voltmeter to MP 3.
9.FM Band Pass . | Connect Test Generator to Aerial Input;
Frequency 93.0MHz; E' = 10uV (20dByV); no Modulation.
10.FM Stop Genera-
Adjust with F 101 (F) for DC Maximum.
Adjust alternating with L 01 ) and L 03 (C) for Maximum.
Connect DC Voitmeter to MP 3.
Connect Sweep Generator to Aerial Input; With F 108 () adjust for a symmetric signal.
tor Center Frequency 93.0MHz; E' = 1mV (60dBuV); no Modu- 93.0MHz
lation; +5V ;
Connect Oscilloscope to MP 13. i |
OV H H
Afs + 25kHz
Connect Test Generator to Aerial Input; Adjust with R 118 (1) for 350mV + 35mvV.
Frequency 93.0MHz; E' = 100yV (40dBuV); no Modulation
Connect DC-Voltmeter between MP 3 (+) and MP 12 (-).
11.FM Fieldstrength
Modulate left channel and set R 204 GJ) for maximum
Crosstalk Attenuation at the right channel.
Now modulate right channel and check crosstalk attenua-
tion at the left channel.
if the difference is more than 3dB, set the attenuations
to best fit with R 204.
Connect Test Generator with Stereo Coder to Aerial input;
Frequency: 93.0MHz; E*= 3mV (70dBLV); fgg: 1KHz; Dev.
22.5kHz; Pilot-Dev. 7.5kHz; SK-Dev.:3.5kHz; BK: m = 0.6;
Balance and Fader to center position. AF output level 0dB
in the 300mV range.
Connect AF Voltmeter to Loudspeaker Outputs.
12. Stereo Crosstalk
Attenuation
Modulate left channel and adjust with R 210) for -20dB
+ 3dB at the right channel.
Connect Test Generator with Stereo Coder to Aerial Input;
Frequency: 93.0MHz; E'= 200uV (46dBuV); £4: 1kHz;
Dev. 22.5kHz; Pilot-Dev. 7.5kHz; SK-Dev.: 3.5kHz; BK:
m = 0.6; Balance and Fader to center position. AF output
level OdB in the 300mV range.
Connect AF Voltmeter to Loudspeaker Outputs.
13 Mono-Stereo
Transition
Adjust with R 1201 (N) (left channel) and R 1202@D (right
channel) to 830mvV.
Play 315Hz/250pWb/mm part. of Test Cassette 448A.
Connect AF Voltmeter to MP 7 (left channel) and MP 8
(right channel).
14. Dolby Level