JVC RC-828L Service Manual page 9

| RC-828L/LB
FM IF & Discriminator Alignment
Input (Sweep Generator) : TP3 (hot) & TP2
Output (Oscilloscope) : IF TP4 (hot) & TP7
Discriminator TP6 (hot) & TP7
Fig. 24 Fig. 25
FM RF Alignment
Input (SSG): Use 75Q terminal, modulation 400Hz modulated to 22.5kHz deviation.
Connect Hot side to TP1 and Cold side to TP2.
EM Repeat the Steps 1 & 2.
1O6MHz
_106MHz Signal
Repeat the Steps 4 & 5, and adjust for no further improvement.
Set the V.
Capacitor to
Frequency
FM MPX Alignment
A. 19kHz Alignment (regular Method) C. Separation Alignment
1. Connect a frequency counter to the test point TP5. 1. Connect a FM stereo signal generator across the test
2. Adjust the variable resistor R31 so that the frequency points TP1 & TP2.
becomes 19kHz +250Hz. 2. Connect a V.T.V.M. or oscilloscope across the test
B. 19kHz Alignment (Simplified Method) points TPG & TP7.
1. Tune to a FM stereo broadcast. 3. Adjust the variable resistor R34 to minimize the
2. Set the variable resistor R31 to the center position of output of right channel signal.
the range in where the stereo indicator keeps lighting.
No. 1344