GRUNDIG Service
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Abgleichvorschriften / Adjustment Procedures
KM 13
GB
Adjustment Procedures
1. Tuner
Test equipment: Sweep Generator, Test Generator, Stereo Coder, Oscilloscope, DC Voltmeter, AF Voltmeter
Note: The frontend is a completely preadjusted module. Only the IF filter must be adjusted to the IF amplifier (1).
2. Cassette Part
Test equipment: AF Voltmeter, Frequency Counter, Test Cassette 449 Part No.: 35079-019.00
Adjustment
Preperation
Adjustment Procedure
1. Azimuth
2. Tape Speed
Adjust screw
A
for AF maximum.
Adjust SFR201 for 3110Hz - 3240Hz.
Access to the screws is gained through holes below the
cassette flaps.
Play Test Cassette 449, 8kHz part.
AF voltmeter at AF output.
Tape, Fe.
Play Test Cassette 449, 3150Hz part.
Frequency counter at AF output.
Adjustment
Preperation
Adjustment Procedure
1. RF Gain
2. E-F-Balance
Adjust VR01 for 0V
±
20mV.
Set VR02 so that the signal amplitude is symmetrical
to the datum line (A=B).
Set CD player to STOP.
DC voltmeter at test point CN12.
Connect a diode (1N4148) between pin 19 (anode) and
pin 8 (cathode) of connector CN601 on the Front Panel
as shown on page 3 - 15, and solder the buttons
„CD CHECK“ and „REPEAT“ on to the panel.
Oscilloscope to test point CN02 (+/-).
Load the test CD and play.
Depress the soldered buttons „CD CHECK“ and
„REPEAT“ simultaneously and adjust VR02.
On completion of this adjustment press the „STOP“
button and remove the diode.
Adjustment
Preperation
Adjustment Procedure
1. AM IF
2. AM Oscillator
3. AM Aerial
Bandpass
4. IF Filter
5. FM Oscillator
6. Stereo
MW; set the tuner to 522kHz.
Sweep generator 450kHz at aerial input.
U
a
as low as possible; f
mod
= 400Hz; m = 30%;
Oscilloscope at loudspeaker output.
MW;
DC voltmeter at test point TP2 (VT).
MW;
Test generator at aerial input.
U
a
as low as possible; f
mod
= 400Hz; m = 30%;
AF voltmeter at loudspeaker output.
FM, 98MHz.
Sweep generator 98MHz to aerial socket. Level approx.
100
µ
V.
Oscilloscope at test point TP1 (VT).
FM;
DC voltmeter at test point TP2 (VT).
FM;
Stereo coder 98MHz at aerial input.
U
a
= 26dB
µ
V; f
mod
= 19kHz;
Adjust T102 for AF maximum.
Adjust L105 at 522kHz for 1.2V
±
0.05V.
Check at 1629kHz 8.0V
±
0.5V.
Adjust alternately L104 at 603kHz and TC102 at
1404kHz for AF maximum.
Adjust Filter
a
to maximum and symmetry.
Check at 87.5MHz 1.6V
±
0.05V.
Check at 108MHz 8.0V
±
0.5V.
With SFR101 adjust the stereo threshold (U
a
= 26dB
µ
V)
so that the stereo indication still illuminates on the
display.
3. CD Part
Test equipment: DC Voltmeter, Oscilloscope, Test CD Part No.: 72008-376.00
A