Vt Adjustment (Lw)/(Mw); Vt Check (Fm) - Aiwa XR-M101 Service Manual

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TUNER ADJUSTMENT
１． １． VT ADJUSTMENT (LW) １． １．
Requirement
Measuring equipment: Digital multi-meter
Test point: TP1(FFE801 ④pin),GND
Adjustment point: L942
(1) Adjust the reception frequency of the main unit to 290KHz.
(2) Adjust L942 until the test point voltage (VT) is 5.5V±0.1V.
(3) Adjust the reception frequency of the main unit to 144KHz.
(4) Check that the test point (VT) voltage is below 2.5V.
２． VT ADJUSTMENT (MW) ２． ２． ２．
Requirement
Measuring equipment: Digital multi-meter
Test point: TP1(FFE801 ④pin),GND
Adjustment point: L774
(1) Adjust the reception frequency of the main unit to 1602KHz.
(2) Adjust L773 until the test point voltage (VT) is 5.5V±0.1V.
(3) Adjust the reception frequency of the main unit to 531KHz.
(4) Check that the test point (VT) voltage is below 2.0V.
３． ３． VT CHECK (FM)
３． ３．
Requirement
TE
L 13942296513
Measuring equipment: Digital multi-meter
Test point: TP1(FFE801 ④pin),GND
(1) Adjust the reception frequency of the main unit to 108.0MHz.
(2) Check that the test point (VT) voltage is about 8.0V.
(3) Adjust the reception frequency of the main unit to 87.5MHz.
(4) Check that the test point (VT) voltage is about 2.5V.
４． ４． ４． DC BALANCE ADJUSTMENT ４．
Requirement
Measuring equipment: Digital multi-meter
Test point: TP4, 5
Adjustment point: L771
(1) Adjust the reception frequency of the main unit to 98.0MHz.
(2) Adjust L771 until the test point voltage difference between TP4 and TP5 is
0mV±20mV.
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DIGITAL MULTIMETER
TP1
GND
DIGITAL MULTIMETER
TP1
GND
0 5 8 2 9 9 4 2 8
DIGITAL MULTIMETER
VT
GND
DIGITAL MULTIMETER
VT
GND
m
9 9
V
V
9 9
V
V