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Abgleichvorschriften / Adjustment Procedures
Adjustment Procedures
GB
1. Electrical Adjustment
Test equipment: DC Voltmeter, Test Generator, AF Voltmeter, Stereo Coder, Sweep Generator, Test Cassette 448A (Part-No 35079-023.00)
5100 RDS: Adjustments 6 ... 11.
5101 RDS, 5200 RDS: Adjustments 1 ... 11.
5201 RDS: Adjustments 1 ... 12.
Adjustment
1. MW Oscillator
MW;
Connect a DC Voltmeter to FMP 639.
2. LW Oscillator
LW; Frequency 153kHz.
Connect a DC Voltmeter to FMP 639.
3. MW Band Pass
Connect a Test Generator to aerial input; MW; m = 0.3; f
=1 kHz; E´ ≤ 10µV (20dBµV).
Connect AF Voltmeter to Loudspeaker Output.
4. LW Band Pass
Connect a Test Generator to aerial input; LW; m = 0.3; f
=1 kHz; E´ ≤ 10µV (20dBµV).
Connect AF Voltmeter to Loudspeaker Output.
5. AM IF
Connect a Test Generator to aerial input; MW; Frequency
990kHz; m = 0,3; f
Connect AF Voltmeter to Loudspeaker Output.
6. FM Oscillator
FM;
Connect a DC Voltmeter to FMP 24.
7. FM Stop Generator
Connect a Sweep Generator to aerial input; FM; Center
frequency 93.6MHz; ∆f = 100kHz; E´ = 1mV (60dBµV); no
modulation.
Connect an Oscilloscope to FMP 110.
8. FM Band Pass
Connect a Test Generator to aerial input; Frequency
93.6MHz; f
Connect AF Voltmeter to Loudspeaker Output.
9. FM IF
Connect a Test Generator to aerial input; Frequency
93.6MHz; f
Connect AF Voltmeter to Loudspeaker Output.
10. Field Strength
Connect a Test Generator to aerial input; Frequency
Level
93.6MHz; E´ = 100µV (40dBµV); no modulation.
Connect DC Voltmeter between FMP 108 (+) and FMP
109 (-).
11. Stereo Crosstalk
Connect Test Generator with Stereo Coder to aerial input;
Frequency: 93.6MHz; E´= 6mV (76dBµV); f
22.5kHz; Pilot dev. 7.5kHz.
Balance and Fader to center position.
Connect AF Voltmeter to Loudspeaker Outputs.
12. Dolby
Play Test Cassette 448A (315Hz Dolby part).
Connect AF Voltmeter to FMP 1119 (left channel) resp.
FMP 1124 (right channel).
Dolby noise reduction under license from Dolby Laboratories Licensing Corporation.
„DOLBY" and the double D Symbol
NR = Noise Reduction.
2 - 2
Preparation
= 1kHz; E´ ≤ 10µV (20dBµV).
mod
= 1kHz; dev. 22.5kHz; E´ ≤ 10µV (20dBµV).
mod
= 1kHz; dev. 22.5kHz; E´ ≤ 10µV (20dBµV).
mod
are trademarks of Dolby Laboratories Licensing Corporation.
Align with L 612A (1) at 531kHz to 1.2V
Check at 1602kHz for 7.5V
Align with L 613A (3) at 153kHz to 1.3V
Check at 279kHz for 5.0V
Align alternating with L 603A (4) at 558kHz and with
mod
C 606A (5) at 1548kHz for maximum AF output.
Align alternating with L 604A (6) at 162kHz and with
mod
C 607A (7) at 261kHz for maximum AF output.
Align with F 601A (8) for maximum AF output.
Align alternating with L 04 (A) at 93.6MHz for 2.9V
Check at 108MHz for 6.0V
Align F 105 (B) for a symmetrical stop impulse.
Align alternating with L 03 (C) and L 01 (D) for AF maxi-
mum.
Align with F 101 (E) for AF maximum.
Align with R 104 (H) for +400V
Modulate left channel and adjust with R 204 (G) for
: 1kHz; dev.
maximum crosstalk attenuation in the right channel.
mod
Now modulate the right channel and measure the crosstalk
attenuation on the left channel.
If the difference is more than 6dB, readjust R 204 for
equal attenuation.
Adjust R 1110D (L) for the left channel resp. R 1113D (M)
for the right channel for 490mV.
5100 RDS / 5101 RDS / 5200 RDS / 5201 RDS
Adjustment Procedure
±
50mV.
±
0.5V.
±
50mV.
±
0.5V.
±
0.5V.
93,6MHz
+5V
0V
∆f = ± 28kHz
±
20mV.
GRUNDIG Service
±
50mV.
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