Adjustment Procedures; Electrical Adjustment - Grundig Scd 5290 Rds Betriebsanleitung

SCD 5290 RDS

Adjustment Procedures

GB

1. Electrical Adjustment

Test equipment: DC Voltmeter, Test Generator, AF Voltmeter, Stereo Coder, Sweep Generator
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.
GRUNDIG Service
Preparation
= 1kHz; E´ ≤ 10µV (20dBµV).
mod
= 1kHz; dev. 22.5kHz; E´ ≤ 10µV (20dBµV).
mod
= 1kHz; dev. 22.5kHz; E´ ≤ 10µV (20dBµV).
mod
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 CR 104 (H) for +220V
Modulate left channel and adjust with CR 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 CR 204 for
equal attenuation.
Abgleichvorschriften / Adjustment Procedures
Adjustment Procedure
±
50mV.
±
0.5V.
±
50mV.
±
0.5V.
±
0.5V.
93,6MHz
+5V
0V
∆f = ± 28kHz
±
15mV.
±
50mV.
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