Adjustment Procedures; Cassette Part (Only Ums 4101) - Grundig CIRFLEXX UMS 4100 Serviceanleitung

Abgleichvorschriften / Adjustment Procedures

Adjustment Procedures

Tuner
Test equipment: Sweep / Signal Generator, Distortion Meter, Oscilloscope, Digital Voltmeter
Note: The frontend is a completely preadjusted module. Only the IF filter must be adjusted to the IF amplifier (Adjustment 4).
The values of the tuning voltages are as follows: 87.5MHz = typ. 1,6V; 108MHz = typ. 8.0V.
Adjustment
1. AM IF AM;
Sweep Generator 450kHz to AM Aerial Input;
Ue > 60dBµV;
Oscilloscope to Testpoint TP5, IC502(-19).
2. AM Oscillator AM, 1620kHz;
Digital Voltmeter to Testpoint TP3.
3. AM Band Pass AM;
Couple Signal Generator via Loop Antennas;
Ue > 50dBµV; f
Oscilloscope to Loudspeaker Output.
4. FM IF FM, 98.0MHz
Signal Generator to FM Aerial Input;
Ue = 20dBµV; f
Distortion Meter to Loudspeaker Outputs.
5. 19kHz Filter FM;
Signal Generator to FM Aerial Input;
Ue = 50dBµV; f
Oscilloscope to Loudspeaker Outputs.
CD
Test equipment: Digital Voltmeter
Adjustment
DC Offset Mode CD;
Digital Voltmeter between TP9 and TP10.
Cassette (only UMS 4101)
Test equipment: Frequency Counter, Oscilloscope, Test Cassette 3150Hz/10kHz (e.g. 448)
Adjustment
1. Bias Oscillator Frequency Counter to CN401A (-2).
Insert empty Cassette and start recording.
2. Azimuth Oscilloscope to Loudspreaker Output.
Insert Test Cassette and play 10kHz part.
3. Tape Speed Frequency Counter to Loudspreaker Output.
Insert Test Cassette and play 3150Hz part.
2 - 3
Preparation
= 1kHz;
mod
= 1kHz; Deviation = 75kHz;
mod
= 19kHz;
mod
Preparation
Preparation
Adjustment Procedure
Adjust with T503 for
Maximum.
±
Adjust with T501 for 8.0V 0.2V.
Adjust alternating with L502 at 558kHz and with VC501 at
1440kHz for AF Maximum.
Adjust with IF Filter A (under the cover) for Distortion
Minimum.
Adjust with LPF501 (left channel) and with LPF502 (right
channel) for AF Minimum.
Adjustment Procedure
±
Adjust with VR701 for 0V 0.1V.
Adjustment Procedure
±
Adjust with L401 for 62kHz 0.5kHz.
2
" with Head Screw a for maximal and equal
Adjust at "
level on both channels.
1
" with Head Screw b for maximal and equal
Adjust at "
level on both channels.
a
With adjustment control (in the
cassette motor) set the frequency
±
to 3150Hz 10Hz.
Bandgeschwindigkeit
Tape Speed
UMS 4100, UMS 4101
b
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