JVC PC-W150 - FM MPX Adjustment; Block Diagram

FM tracking
adjustment
(PC-W150 G)
FM tracking
adjustment
(PC-W150 Gl)
<Conditions >
1. Radio band : FM
2. Signal input : 75 0 unbalance
3. Input frequency : Positive side to TP1
Negative side to TP2
87.5+0.1 MHz, 108.3+0.05 MHz
90 MHz, 106 MHz
< Adjustment >
. Receive 87.5+0.1 MHz at maximum variable
capacitor position.
. Adjust L1 so that output level becomes maximum.
. Receive 108.3+0.05 MHz at minimum variable
Capacitor position. ;
. Adjust TC1 so that output level becomes maximum.
. Adjust the above aligning position (L1 & TC1)
repeatedly so that the tuner can be received above
frequency range (band width).
. Receive 90 MHz and adjust L2 so that output level
becomes maximum.
. Receive 106 MHz and adjust TC2 so that output
level becomes. maximum.
. Adjust the above aligning position (L2 & TC2)
repeatedly so that the tuner can be obtained the best
sensitivity.
<Conditions >
1. Radio band : FM
2. Signal input : 75 Q unbalance
3. Input frequency : 87.35+0.05 MHz,
108.3+0.05 MHz
90 MHz, 106 MHz
< Adjustment >
. Receive 87.35+0.05 MHz at maximum variable
capacitor position.
. Adjust L1 so that output level becomes maximum.
. Receive 108.340.05 MHz at minimum variable
capacitor position. :
. Adjust TC 1 so that output level becomes maximum.
. Adjust the above aligning position (L1 & TC1)
repeatedly so that the tuner can be received above
frequency range (band width).
. Receive 90 MHz and adjust L2.so that output level
becomes maximum.
. Receive 106 MHz and adjust TC2 so that output
level becomes maximum. :
. Adjust the above aligning position (L2 & TC2)
repeatedly so that the tuner can be obtained the best
sensitivity. ;
Input frequency
: 87.5+0.1 MHz
maximum
Input frequency
: 108.340.05 MHz
maximum
Input frequency
: 90 MHz
maximum
Input frequency
: 106 MHz
maximum
Input frequency
: 87.3540.05 MHz
maximum
Input frequency
: 108.340.05 MHz
maximum
Input frequency
: 90 MHz
maximum
Input frequency
1.106 MHz.
maximum
FM MPX
adjustment
< Conditions >
1. Radio band : FM
signal)
3. Signal input : TP1, TP2
< Adjustment >
+100 Hz.
[9] Block Diagram
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2. Input frequency : 98 MHz (unmodulated 60 dB
4. Measuring point : TP7, TP8
1. Connect the digital frequency counter to TP8
(positive side) and TP7 (negative side).
2. Adjust VR1 so that above frequency is 19 kHz
VR | .
QoQ. aati! the clip
:
180kQ LVoltm
Signal should be amplified by an electronic voltmeter
so that sounter could measure its frequency.
Fig. 8-5
| PC-W150 B/E/G/GI
| item Measuring Conditions and Main Adjustments Standard Value Adjusting Point
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(No. 1785) 17