Sharp 32F630 Service Manual - Page 13

32F630 32F631 Ë MTS ADJUSTMENT MTS Level Adjustment 1. Set the sound volume above 1. Monoral signal: 400Hz, 100% modulation 2. Confirm "EX4" data is "5Ah". 3. Vary the "M01" bus data until the voltage to pin (39) of IC3001 to become the value as stated below. SETTING VOLTAGE ADJ spec : 490±10mVrms CHK spec: 490±20mVrms MTS VCO Adjustment 1. Keep the unit in no-signal state. 2. Connect the frequency counter to pin (39) of IC3001. 3. Connect a capacitor (100µF, 50V) in between positive(+) side of C3005 and ground. 4. Enter the service mode and select the service adjustment "M02" 5. Adjust the data so that the frequency counter reads 62.94 ±0.75kHz. Filter Adjustment 1. Feed the following stereo pilot signal to pin (14) of IC3001 at C3005 open. Stereo pilot signal: 9.4kHz, 600mVrms. 2. Enter the service mode and select the service adjustment "M03". 3. Adjust the data until "OK" appears in position on the screen. Make sure the "OK" is displayed almost at the center of the data range. Separation Adjustment 1. Input "SIGNAL 1" and vary the "M04" bus data to get the minimun AC voltage to pin (39) of IC3001. 2. Input "SIGNAL 2" and vary the "M05" bus data to get the minimun AC voltage to pin (39) of IC3001. SIGNAL 1: 300Hz, 30% modulation, Lch only, NR-ON SIGNAL 2: 3kHz, 30% modulation, Lch only, NR-ON Note: SIGNAL 1 Adj. for widebando SIGNAL 2 Adj. for spectral Check the output of the speaker at the maximum volume as stated below. Confirmation spec: ADJ spec: above 25 dB CHK spec: above 20 dB 12