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Adjustment Procedures - Grundig SCD 3390 RDS Serviceanleitung

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SCD 3390 RDS / Challenge 600 CD

Adjustment Procedures

Test equipment: DC Voltmeter, Test Generator, AF Voltmeter, Stereo Coder, Distortion meter
After repairing the RF or IF Part the adjustment of Signal Level Offset (para 8) must be done.
Adjustment
1. Oscillator (AM and
FM)
2. AM IF
3. FM Pre Stage
4. FM Band Pass
5. FM IF
6. FM Demodulator
7. Sliding Stereo
Mono Transition
8. Signal Level Offset
GRUNDIG Service
Downloaded from
www.Manualslib.com
Preparation
FM;
Connect a DC Voltmeter to FMP16.
Connect a Test Generator to aerial input; LW; Frequency
153 kHz; no modulation; E´ = 50µV (34dBµV).
Connect a DC Voltmeter to FMP108.
Connect a Test Generator to aerial input; Frequency
88.0MHz; no modulation; E´ = 3µV (10dBµV).
Connect a DC Voltmeter to FMP108.
Connect a Test Generator to aerial input; Frequency
88.0MHz; no modulation; E´ = 3µV (10dBµV).
Connect a DC Voltmeter to FMP108.
Connect a Test Generator to aerial input; Frequency
88.0MHz; no modulation; E´ = 3µV (10dBµV).
Connect a DC Voltmeter to FMP108.
Connect a Test Generator to aerial input; Frequency
88.0MHz;
f
= 1kHz; dev. = 22,5kHz; E´ = 2µV (6dBµV);
mod
Connect an AF Voltmeter to Loudspeaker Output.
Set AF output level to < 100mW.
f
= 1kHz; dev. = 75kHz; E´ = 1mV (60dBµV);
mod
Connect a Distortion meter to Loudspeaker Output.
Connect Test Generator with Stereo Coder to aerial input;
Frequency: 88.0MHz; E´ = 100µV (40dBµV); f
dev. 22.5kHz; Pilot dev. 7.5kHz.
Connect an AF Voltmeter to Loudspeaker Output.
Connect a DC Voltmeter to FMP108.
AM: Connect a Test Generator to aerial input; Frequency
1008kHz; no modulation; E´ = 16µV (24dBµV);
FM: Connect a Test Generator to aerial input; Frequency
95.0MHz; no modulation; E´ = 7µV (17dBµV);
Calling up parameter sets:
Switch off the unit. Hold button
switch on the unit. Release button
was heard (abt. 5 seconds).
Press button
¢ ¢ ¢ ¢ ¢
again, until 2 peeps could be heard
RADIO
(abt. 7 seconds).
Press button
¢ ¢ ¢ ¢ ¢
until 1 peep could be heard (abt. 1
TP
second).
AM: With buttons r
TUNING
e.g. 00 1700 . Note the value U
FM: With buttons r
TUNING
e.g. 02 1640 . Note the value U
Calculating the Offset Value W:
AM: U
= U
- U
(in millivolts)
Offs
AM
FS
FM: U
= U
- U
(in millivolts)
Offs
FM
FS
If U
is negativ: W = 256 +
Offs
U
Offs
if U
is positiv: W =
20
Offs
manuals search engine
Align alternating with L06 at 87.5MHz for 2.0V
with C29 at 108MHz for 6.0V
Align with F603A for maximum Voltage.
Align with L02 for maximum Voltage.
Align with L04 for maximum Voltage.
Align with F101 for maximum Voltage.
Align with F106 for maximum AF Voltage.
Align with F106 for minimum distortion.
Modulate left channel and adjust with R206 for 6dB cross-
: 1kHz;
talk attenuation in the right channel.
mod
Measure Voltage (U
Example 1:
depressed and
U
= 1700; Measured Voltage U
¢ ¢ ¢ ¢ ¢
RADIO
AM
only after 1 peep
U
= U
¢ ¢ ¢ ¢ ¢
RADIO
Offs
As U
Offs
W = 256 + (-7) = 249
Example 2:
U
= 1640; Measured Voltage U
FM
t select parameter 00:
U
= U
Offs
(here e.g. 1700).
AM
As U
t select parameter 02:
Offs
(here e.g. 1640).
FM
AM: With buttons r
e.g. 50 174 . Briefly press button
With buttons r
(e.g. W = 249: 50 249 ). Briefly press button
U
Offs
(see example 1);
FM: With buttons r
20
e.g. 51 14 . Briefly press button
(see example 2).
With buttons r
(e.g. W = 21: 51 21 ). Briefly press button
Abgleichvorschriften / Adjustment Procedures
Adjustment Procedure
±
100mV.
in millivolts) and note it.
FS
= 1842mV;
FS
- U
= 1700 - 1842mV = -142mV.
AM
FS
U
Offs
is negativ: W = 256 +
= 256 +
20
= 1220mV;
FS
- U
= 1640 - 1220mV = 420mV.
FM
FS
U
420
Offs
is positiv: W =
=
= 21
20
20
t select parameter 50:
TUNING
¢ ¢ ¢ ¢ ¢
.
TP
t now set the calculated value
TUNING
t select parameter 51:
TUNING
¢ ¢ ¢ ¢ ¢
.
TP
t now set the calculated value
TUNING
±
20mV and
-142
20
¢ ¢ ¢ ¢ ¢
again.
TP
¢ ¢ ¢ ¢ ¢
again.
TP
2 - 2

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Diese Anleitung auch für:

Challenge 600 cd72010 757 8000

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