GRUNDIG AURA
Instrukcja Serwisowa

AURA

Abgleichvorschriften / Adjustment Procedures

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.

Adjustment 1. MW Oscillator

Preparation MW; Connect a DC Voltmeter to FMP705. LW; Connect a DC Voltmeter to FMP705.

Adjustment Procedure 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.

2. LW Oscillator

3. AM IF

Connect a Test Generator to aerial input; Frequency Align with L604A for maximum voltage. 1548kHz; no modulation; E´ = 100µV (40dBµV). Connect a DC Voltmeter to FMP602. Connect a Test Generator to aerial input; no modulation; Align alternating with C608A at 1548kHz and with L601A at E´ = 100µV (40dBµV). 558kHz for maximum voltage. Connect a DC Voltmeter to FMP602. Connect a Test Generator to aerial input; no modulation; Align with L602AL at 162kHz for maximum voltage. 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.

4. MW Bandpass

5. LW Bandpass

6. AM search level stop

Change Parameter value 01 until search just stops.

Apply a signal with E´ = 20µV (26dBµV). Set DX to ON.

Change Parameter value 00 until search just stops.

7. FM Oscillator

FM; Connect a DC Voltmeter to FMP705.

Align with L06 at 87.5MHz for 1.6V ± 50mV. Check for 6.5V ± 0.5V at 108MHz.

8. FM RF and IF

Connect a Test Generator to aerial input; Frequency 95.0MHz; no modulation; E´ = 100µV (40dBµV). Align alternating with L03 and L04 for maximum. Connect a DC Voltmeter between FMP101 (+) and FMP103 (-). Align with L05 for maximum. Connect a Test Generator to aerial input; Frequency 98.0MHz; fmod = 1kHz; Hub = 22.5kHz; E´ = 1mV (60dBµV). Connect an AF Voltmeter to FMP101. Call up the extended expert mode (see above). Select parameter 48.

9. IF Center frequency

Set the parameter value for minimum AF voltage.

10. Stop Generator

Connect a sweep generator to aerial input. Center fre- Align L 101 for a symmetrical stop impulse. quency 95.0MHz; �f = ± 100kHz; no modulation; 95.0MHz E´ = 100µV (40dBµV); +5V Connect an Oscilloscope to FMP104. 0V �f� ± 45kHz Connect a Test Generator to aerial input; Frequency 95.0MHz; no modulation; E´ = 70µV (37dBµV). Connect a DC Voltmeter between FMP101 (+) and FMP103 (-). Adjust with CR26 for +300mV ± 10mV.

11. Field strength

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