JVC RC-838L Service Manual page 9

RC-838L/LB
FM IF & Discriminator Alignment
Input (Sweep Generator) : TP3 (hot) & TP2
Output (Oscilloscope) : IF TP4 (hot) & TP7
Discriminator TP6 (hot) & TP7
Place to be aligned Wave form
T1 Fig. 24
Fig. 24 Fig. 25
Discriminator
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.
Input Signal
Set the V.
Capacitor to
ta
C4 Minimum
106MHz Signal
Repeat the Steps 4 & 5, and adjust for no further improvement.
Place to be
aligned
Frequency
Band
Frequency Given to
87.5MHz
109MHz
TP1 & TP2
Repeat the Steps 1 & 2.
106MHz
TP1 & TP2
FM MPX Alignment
the range in where the stereo indicator keeps lighting.
No. 1380