JVC RC-636L - Page 6

RC-636L/LB |
Tuner Alignment
Output Measuring: Speaker terminal (Impedance =42), output level 5|OmW (0.45V/40}
AM IF & RF Alignment
Input (SSG) Modulation 400Hz, Modulated to 30%
Input Signal Place to be Set the V.
Given to aligned Capacitor to
Repeat the Step 1, and adjust for no further improvement.
Loop Antenna —
105
Frequency
Band
Repeat the Steps 9 & 10.
600kHz rere 600kHz Signal
1400kHz sci paaieatey TC6 1400kHz Signal
Repeat the Steps 12 & 13, and adjust for no further improvement.
1@.6MHz | __Dummy Antenne TB
Repeat the Steps 15 & 16.
6.0MHz Rod Antenna through 6.0MHz Signal
18.0MHz Dummy Antenna TC3 18.0MHz Signal
Repeat the Steps 18 & 19, and adjust for no further improvement.
FM IF & Discriminator Alignment
1. Connect a sweep generator to the test point TP4.
2. Connect a oscilloscope across the test points TP6 (Hot) and TP9.
3. Align the T3 so that the S-curve will become symmetrical and the noise become minimum.
Note: 1. Align after mounting the tuner circuit board in the cabinet to avoid affection of leakage flux of the speaker.
2. After alignment, demagnetize the coils L10 and T3 by a head demagnetizer to decrease possible modulation hum
due to leakage flux of the speaker.
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.
Place to be Set the V.
Frequency aligned Capacitor to
109MH2
F
Frequency
M Repeat the Steps 1 & 2.
SOF nal
TP1
&
TP2
9OMHz
ious
106MHz 106MHz Signal
Repeat the Steps 4 & 5, and adjust for no further improvement.