Sony ICF-SW7600GR Service Manual - Page 7
nd Local Adjustment, FM Tracking Adjustment, 76kHz MPX Adjustment, Just Tune Adjustment - ssb
UPC - 027242580084
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ICF-SW7600GR (3) 2nd Local Adjustment Setting: ATT switch : OFF TONE switch : MUSIC AM MODE switch : NORM Procedure: 1. Connect frequency counter to the TP OSC2 through the high input impedance amplifier. 2. Tune the set to AM 150kHz. 3. Adjust CT202 so that the reading on the frequency counter becomes in 55.39000MHz±30Hz.(55.38997 to 55.39003MHz) Adjustment Location: MAIN board (See page 8) (6) Just Tune Adjustment Setting : ATT switch : OFF TONE switch : MUSIC (FM RF signal generator) Frequency : 93.025MHz Moduration : 22.5kHz Output level : 54dB Procedure: 1. Connect an oscilloscope to the TP SD. 2. Tune the set to FM 93.00MHz. 3. Adjust RV202 so that the waveform on the oscilloscope satisfy as shown the figure. (4) FM Tracking Adjustment Setting: ATT switch : OFF TONE switch : MUSIC Procedure: 1. Set the frequency of the FM RF signal generator and the frequency display of the set to FM 108.00MHz. 2. Adjust CT101 and CT102 so that the reading on level meter becomes in maximum. 3. Set the frequency of the FM RF and the frequency display of the set to FM 76.00MHz. 4. Adjust T101 and T102 so that the reading on level meter becomes in maximum. 5. Repeat the above steps 1 to 4 several times. Adjustment Location: MAIN board (See page 8) (5) 76kHz (MPX) Adjustment Setting: ATT switch : OFF TONE switch : MUSIC Procedure: 1. Insert Headphones plug into headphones jack (J202) (for VCO operation). 2. Connect a capacitor (10µF) between IC202 pin1 and GND. 3. Connect frequency counter to the TP 76K (VCO) through the high input impedance amplifier. 4. Tune the set to FM 108.00MHz. 5. Adjust RV203 so that the reading on the frequency counter becomes in 76kHz±300Hz. 6. Remove the headphones plug. Adjustment Location: MAIN board (See page 8) NG NG NG OK Adjustment Location: MAIN board (See page 8) Center (7) SSB 0 Beat Adjustment Setting : ATT switch : OFF TONE switch : MUSIC (AM RF signal generator) Frequency : AM 150kHz Moduration : None Output level : 44dB Procedure: 1. Connect an oscilloscope to the TP DET. 2. Tune the set to AM 150kHz. 3. Set the AM MODE switch to SYNC. 4. Set the SYNC switch to USB. 5. Adjust CT201 so that the waveform on the oscilloscope is minimized. 6. Set the SYNC switch to LSB. 7. Adjust CT201 so that the waveform on the oscilloscope is minimized. 8. Repeat the above steps 4 to 7 several times. 9. Set the AM MODE switch to SSB. 10. Confirm that the beat sound is changed by turning the SSB FINE TUNE control. Adjustment Location: MAIN board (See page 8) 7