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Abgleichvorschriften / Adjustment Procedures
Adjustment Procedures
GB
Tuner:
Test Equipment:
Sweep generator, Test generator, Stereo coder, Oscilloscope, Digital voltmeter, AF Voltmeter
Adjustment
1. AM Oscillator
AM
Digital voltmeter to testpoint A.
2. AM IF
AM, 603kHz
Test generator 603kHz to ferrite antenna (see Fig. 1).
f
= 1kHz, m = 0.3.
mod
AF voltmeter to Loudspeaker connector.
3. AM RF circuit
AM
Test generator to ferrite antenna (see Fig. 1). f
m = 0.3.
AF voltmeter to Loudspeaker connector.
4. FM Oscillator
FM
Digital voltmeter to testpoint A.
5. FM IF
FM, 88MHz
Sweep generator 88MHz to antenna connector (see Fig. 2).
Level <, ∆f = ± 200kHz,
Oscilloscope via 0.5pF to IC101, Pin 12.
6. FM RF circuit
FM
Test generator to antenna connector (see Fig. 2). Level <,
f
= 1kHz, dev. 22.5kHz.
mod
AF voltmeter to Loudspeaker connector.
7. Stereo decoder
FM, 88MHz
Stereo coder 88MHz to antenna connector (see Fig. 2).
Left channel modulated. Level 1mV / 75Ω, f
22.5kHz, pilot dev. 6.5kHz.
AF voltmeter to Loudspeaker connector, right chan-
nel.
Cassette:
Test Equipment:
AF voltmeter, Frequency counter, Test Cassette 449 (Part No. 35079-019.00)
Adjustment
1. Azimuth
AF voltmeter to Loudspeaker connector.
PlayTest Cassette 449 (8kHz part).
2. Tape speed
Frequency counter to Loudspeaker connector.
PlayTest Cassette 449 (3150Hz part).
2 - 3
Preparation
= 1kHz,
mod
= 1kHz, dev.
mod
Preparation
Adjustment Procedure
At 603kHz adjust F109 to 1.75V
At 1404kHz check for < 6.7V.
Adjust F104 to maximum level.
Adjust alternating with F105 at 603kHz and with CT103 at
1404kHz for maximum level.
±
At 88MHz adjust L103 to 2.6V
At 106MHz check for < 5.9V.
Adjust with F108 and F103 for maximum and symmetry.
Adjust alternating with L102 at 88MHz and with CT102 at
106MHz for maximum level.
Adjust R124 for minimum.
Control the left AF output with the right channel modulated.
Crosstalk value should be > 20dB.
Adjustment Procedure
With screw A adjust for maximum level.
A
With Motorpoti adjust for 3150Hz.
Motorpoti
PA 1
±
0.1V.
0.1V.
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