Grundig Aura service manual Tape Drive, Connect an AF Voltmeter to loudspeaker outputs

Abgleichvorschriften / Adjustment ProceduresAURA

Adjustment		Preparation		Adjustment Procedure
12. Stereo Crosstalk	Connect a Test Generator via a Stereo Coder to aerial
	input; Frequency 95.0MHz; fmod 1kHz at 22.5kHz dev.; Pilot
	19kHz at 7.5kHz dev.; RDS 57kHz at 1.2kHz dev.; E´ = 1mV
	(60dBμV); modulate only the left channel.
	Connect an AF Voltmeter to loudspeaker outputs.
	Call up the extended expert mode (see above).		Set the parameter value for minimum AF voltage on the
	Select parameter 53.		right channel.
13. FM search level	Connect a Test Generator to aerial input; Frequency
stop	95.1MHz; no modulation;
	Call up the extended expert mode (see above).
	Apply a signal with E´ = 80μV (38dBμV). Set DX to OFF.		Change Parameter value 03 until search just stops.
	Apply a signal with E´ = 8μV (18dBμV). Set DX to ON.		Change Parameter value 02 until search just stops.
14. Power Amplifier	In ´cold´ condition measure the voltage Um at FMP1609.
Over Temperature	Calculate the parameter value: W = (Um - 340mV) / 16.9mV.		Change Parameter 65 to the calculated value.
	e.g.: Um = 1.20V. W = (1200mV - 340mV) / 16.9mV.
	W = 860mV / 16.9mV = 43.8 = 44.		e.g.: E 65 44.

2. Tape Drive

Test equipment: Frequency counter, Test Cassette 448A (Part No. 35079 023 0000)

Adjustment	Preparation	Adjustment Procedure
Tape Speed	Insert Test Cassette 448A and play 3150Hz part.	With the ´Motorpoti´ adjust for 3150Hz ± 100Hz.
	Connect a frequency counter to loudspeaker outputs.
			Motorpoti

Dolby noise reduction under license from Dolby Laboratories Licensing Corporation.

„DOLBY“ and the double D Symbol gare trademarks of Dolby Laboratories Licensing Corporation. NR = Noise Reduction.

For adjustment use the aerial dummies for AM resp. FM

AM

Kabel 50Ω

Rg	50Ω
	EMK

			E´= EMK - 26dB
37.5Ω		55Ω	E´
			15pF
150Ω	37.5Ω		60pF

FM

Kabel 50Ω

Rg	50Ω
	EMK

		E´= EMK - 6dB
10Ω	45Ω	E´
		10nF
	60Ω	75Ω

8 GRUNDIG Service