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ften / Adjustment Procedures
cedure
evel at the test points O
> 75mV.
made on the cassette
-0.5 dB must be present
)
bove re-adjust the head
or R182 (right channel)
evel at the test points O
) U, = 13mV.
y the levels at the test
fer by more than 0.5dB.
B correct the bias with
shannel.
= type of tape and the
evel at the test points ©
U, = 245mv.
P106 (L) or Pin 1 of
ying back the recording
rc
Sw"
PCayieuacaulvull
So
gkeit
2-6
Tuner
Test Equipment:
Sweep generator, Test generator, Stereo coder, AF-generator, Oscilloscope, Digital voltmeter, AF-Voltmeter, Distortion meter
Note:
The frontend is a completely preadjusted module. Only the IF filter must be adjusted to the IF amplifier (1). The values of the tuning voltages are:
87.5MHz = typ. 1.6V min 1.3V; 108MHz = typ. 8.0V max 9V
1. IF Filter
FM, 98MHz.
Adjust F1 @ to maximum and symmetry.
Sweep generator 98MHz to aerial socket. Level approx.
2. Demodulator
100nV / 75Q, Af = +200kHz.
3. Station search
Oscilloscope to testpoint ®).
FM, 98MHz
Test generator 98MHz to aerial socket. Level approx.
100LV / 75Q, Af = +200kHz.
Distortion meter to AF output.
Adjust F7 @ to minimal Distortion (typ. 0.12%, max.
0.2%).
FM, 98MHz.
Test generator 98MHz, U,,= 100nV/75Q.to aerial socket.
Digitalvoltmeter to testpoint ©.
Adjust R 123 © to 1.2V + 0.05V.
FM
Stereocoder, left channel modulated, to aerial socket.
AF voltmeter to AF output, right channel.
4. Stereo Crosstalk
Adjust R 69 © to minimum.
Control the left AF output with modulated right channel.
FM
AF generator 114kHz, approx. 100mV to the input of F2 ©
(Pin 2).
AF voltmeter to the output of F2 © (Pin 4).
5. Adjacent channel
filter
Test generator to aerial socket; FM, f
6. 38 kHz Filter
AF voltmeter to AF output.
7. 19 kHz Filter
Test generator to aerial socket; FM, f,,, = 19kHz.
Adjust F9 @ (left channel) and F11 @ (right channel) to
AF voltmeter to AF output.
minimum.
8. MW Oscillator
MW, 531kHz
Adjust L18 WD to 1.1V.
Digitalvoltmeter to testpoint ©.
9. MW PF Circuits
MW
Adjust C3 Gv) and F6 GD at 1449kHz and L1 GiD at
Test generator via 120-150,1H parallel to frame aerial; AM, | 558kHz to maximum. Repeat the adjustment reciprocally,
U,- = 3HV, m = 30%, f, = 1kHz.
end with 1449kHz.
AF voltmeter to AF output.
Adjust F2 © to minimum.
FM
Adjust F9 @ (left channel) and F11 © (right channel) to
= 38kHz.
minimum.
mod
Amplifier
Test Equipment:
Digital voltmeter
eee
1. Quiescent Current | No Input Signal. Volume to Minimum. Switch on the set for
at least 2 minutes.
Adjustment Procedure
Left channel:
Left channel:
Digitalvoltmeter between testpoints Al and BI.
Adjust with R516 for 3mV +0.5mV.
Right channel:
Right channel:
Digitalvoltmeter between testpoints Ar and Br.
Adjust with R522 for 3mV +0.5mV.
Table for IF-Programming
0 = Bridge opened
1 = Bridge closed
IF (MHz)
ait
IF Filter
Ident
Colour
10,7625
10,7750
10,7875
oe tee
oe Te A
weg OCO00000
—a-4O0O-+00--"00---00
When replacing one of the ceramic resonators, take care
that the colour codes of all resonators are the same.
BR2 BRO
BR3
BRI
Amplifier
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