Abgleichvorschriften / Adjustment Procedures
5100 RDS / 5101 RDS / 5200 RDS / 5201 RDS
2 - 2
GRUNDIG Service
GB
Adjustment Procedures
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.
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
9. FM IF
10. Field Strength
Level
11. Stereo Crosstalk
12. Dolby
Adjustment
Preparation
Adjustment Procedure
MW
;
Connect a
DC Voltmeter
to
FMP 639
.
LW; Frequency 153kHz.
Connect a
DC Voltmeter
to
FMP 639
.
Connect a Test Generator to aerial input; MW; m = 0.3; f
mod
=1 kHz; E´
≤
10
µ
V (20dB
µ
V).
Connect
AF Voltmeter
to
Loudspeaker Output
.
Connect a Test Generator to aerial input; LW; m = 0.3; f
mod
=1 kHz; E´
≤
10
µ
V (20dB
µ
V).
Connect
AF Voltmeter
to
Loudspeaker Output
.
Connect a Test Generator to aerial input; MW; Frequency
990kHz; m = 0,3; f
mod
= 1kHz; E´
≤
10
µ
V (20dB
µ
V).
Connect
AF Voltmeter
to
Loudspeaker Output
.
FM;
Connect a
DC Voltmeter
to
FMP 24
.
Connect a Sweep Generator to aerial input; FM; Center
frequency
93.6MHz
;
∆
f = 100kHz; E´ = 1mV (60dB
µ
V); no
modulation.
Connect an
Oscilloscope
to
FMP 110
.
Connect a Test Generator to aerial input; Frequency
93.6MHz
; f
mod
= 1kHz; dev. 22.5kHz; E´
≤
10
µ
V (20dB
µ
V).
Connect
AF Voltmeter
to
Loudspeaker Output
.
Connect a Test Generator to aerial input; Frequency
93.6MHz
; f
mod
= 1kHz; dev. 22.5kHz; E´
≤
10
µ
V (20dB
µ
V).
Connect
AF Voltmeter
to
Loudspeaker Output
.
Connect a Test Generator to aerial input; Frequency
93.6MHz
; E´ = 100
µ
V (40dB
µ
V); no modulation.
Connect
DC Voltmeter
between
FMP 108 (+)
and
FMP
109 (-)
.
Connect Test Generator with Stereo Coder to aerial input;
Frequency:
93.6MHz
; E´= 6mV (76dB
µ
V); f
mod
: 1kHz; dev.
22.5kHz; Pilot dev. 7.5kHz.
Balance and Fader to center position.
Connect
AF Voltmeter
to
Loudspeaker Outputs
.
Play Test Cassette 448A (315Hz Dolby part).
Connect
AF Voltmeter
to
FMP 1119
(left channel) resp.
FMP 1124
(right channel).
Align with
L 612A (1)
at
531kHz
to
1.2V
±
50mV
.
Check at
1602kHz
for
7.5V
±
0.5V
.
Align with
L 613A (3)
at 153kHz to
1.3V
±
50mV
.
Check
at
279kHz
for
5.0V
±
0.5V
.
Align alternating with
L 603A (4)
at
558kHz
and with
C 606A (5)
at
1548kHz
for
maximum AF output
.
Align alternating with
L 604A (6)
at
162kHz
and with
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
±
50mV
.
Check at
108MHz
for
6.0V
±
0.5V
.
Align
F 105 (B)
for a
symmetrical stop impulse
.
93,6MHz
+5V
0V
∆
f =
±
28kHz
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
±
20mV
.
Modulate left channel and adjust with
R 204 (G)
for
maximum crosstalk attenuation
in the right channel.
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
.
Dolby noise reduction under license from Dolby Laboratories Licensing Corporation.
„DOLBY“ and the double D Symbol
ij
are trademarks of Dolby Laboratories Licensing Corporation.
NR = Noise Reduction.
