Read Harman Kardon TU 940 Service Manual online
FM SECTION
• Standard Setting of FM Stereo RF Signal Generator.
STEREO STANDARD SIGNAL
MONAURAL STANDARD SIGNAL
Carrier frequency 98 MHz.
Modulation: Audio 1 kHz, 40 kHz deviation.
Pilot 19 kHz, 7.5 kHz deviation.
98 MHz.
1 kHz, 40 kHz deviation.
FM Discriminator Adjustment
(NULL and MONO Distortion)
(NULL and MONO Distortion)
Procedure:
1. Tune the set to 98 MHz.
2. Adjust L302 to obtain 0V between TP301 3 reading on the VOM. … … … … .NULL.
3. Adjust L200 for a minimum reading on the distortion meter … … … ..MONO Distortion
4. Repeat adjustments in step 2 and 3 several times until optimum measurements are obtained.
Note: When replacing the ceramic filter, perform this alignment
.
1. Tune the set to 98 MHz.
2. Adjust L302 to obtain 0V between TP301 3 reading on the VOM. … … … … .NULL.
3. Adjust L200 for a minimum reading on the distortion meter … … … ..MONO Distortion
4. Repeat adjustments in step 2 and 3 several times until optimum measurements are obtained.
Note: When replacing the ceramic filter, perform this alignment
.
FM Stereo Distortion Adjustment
Procedure:
1. Tune the set to 98MHz. Set FM SSG. output level to 1mV (60dBµ).
2. Adjust IFT in FE401 for a minimum reading on the distortion meter.
1. Tune the set to 98MHz. Set FM SSG. output level to 1mV (60dBµ).
2. Adjust IFT in FE401 for a minimum reading on the distortion meter.
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