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AURA Abgleichvorschriften / Adjustment Procedures
GRUNDIG Service 7
GB
Adjustment Procedures
1. Main Board
Test equipment: DC Voltmeter, Test Generator, AF Voltmeter, Stereo Coder, Sweep Generator, Oscilloscope
Calling up the ´extended Expert Mode´:
Switch off the set. Press and hold depressed station button 2 and switch on the set. Hold the station button 2 depressed for more than 10 seconds.
Press and hold depressed the TAPE/CD button for about 5 seconds until the display shows SE-XX-MC (XX = Version of software). Press button TP/AS
for more than 5 seconds until after the second sound. With the buttons < resp. > select the corresponding parameter set (display shows e.g. 00 1400).
Press button TP/AS briefly (additional E in the display: E 00 1400). With the buttons < resp. > change the value. Press button TP/AS briefly (E goes
out).
If you changed an other parameter by mistake you can find its correct value in the parameter table on page 9.
Leaving the ´extended Expert Mode´:
Switch off the set.
1. MW Oscillator
2. LW Oscillator
3. AM IF
4. MW Bandpass
5. LW Bandpass
6. AM search level
stop
7. FM Oscillator
8. FM RF and IF
9. IF Center fre-
quency
10. Stop Generator
11. Field strength
Adjustment Preparation Adjustment Procedure
MW;
Connect a DC Voltmeter to FMP705.
LW;
Connect a DC Voltmeter to FMP705.
Connect a Test Generator to aerial input; Frequency
1548kHz; no modulation; E´ = 100µV (40dBµV).
Connect a DC Voltmeter to FMP602.
Connect a Test Generator to aerial input; no modulation;
E´ = 100µV (40dBµV).
Connect a DC Voltmeter to FMP602.
Connect a Test Generator to aerial input; no modulation;
E´ = 100µV (40dBµV).
Connect a DC Voltmeter to FMP602.
Connect a Test Generator to aerial input; Frequency
1008kHz; no modulation;
Call up the extended expert mode (see above).
Apply a signal with E´ = 250µV (48dBµV). Set DX to OFF.
Apply a signal with E´ = 20µV (26dBµV). Set DX to ON.
FM;
Connect a DC Voltmeter to FMP705.
Connect a Test Generator to aerial input; Frequency
95.0MHz; no modulation; E´ = 100µV (40dBµV).
Connect a DC Voltmeter between FMP101 (+) and
FMP103 (-).
Connect a Test Generator to aerial input; Frequency
98.0MHz; f
mod
= 1kHz; Hub = 22.5kHz; E´ = 1mV (60dBµV).
Connect an AF Voltmeter to FMP101.
Call up the extended expert mode (see above).
Select parameter 48.
Connect a sweep generator to aerial input. Center fre-
quency 95.0MHz; ∆f = ± 100kHz; no modulation;
E´ = 100µV (40dBµV);
Connect an Oscilloscope to FMP104.
Connect a Test Generator to aerial input; Frequency
95.0MHz; no modulation; E´ = 70µV (37dBµV).
Connect a DC Voltmeter between FMP101 (+) and
FMP103 (-).
Align with L606A at 531kHz for 1.0V ± 50mV.
Check for 7.0V ± 0.5V at 1602kHz.
Align with L607AL at 153kHz for 1.3V ± 50mV.
Check for 5.0V ± 0.5V at 279kHz.
Align with L604A for maximum voltage.
Align alternating with C608A at 1548kHz and with L601A at
558kHz for maximum voltage.
Align with L602AL at 162kHz for maximum voltage.
Change Parameter value 01 until search just stops.
Change Parameter value 00 until search just stops.
Align with L06 at 87.5MHz for 1.6V ± 50mV.
Check for 6.5V ± 0.5V at 108MHz.
Align alternating with L03 and L04 for maximum.
Align with L05 for maximum.
Set the parameter value for minimum AF voltage.
Align L 101 for a symmetrical stop impulse.
95.0MHz
+5V
0V
∆f≤ ± 45kHz
Adjust with CR26 for +300mV ± 10mV.