-26-
ELECTRICAL ADJUSTMENT-4/13 (K MODEL)
TUNER ADJUSTMENT
1. VT ADJUSTMENT (LW)
Requirement
• Measuring equipment : Digital multi-meter
Test point
: TP1(FFE801
4
pin),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)
Requirement
• Measuring equipment : Digital multi-meter
Test point
: TP1(FFE801
4
pin),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. VT CHECK (FM)
Requirement
• Measuring equipment : Digital multi-meter
Test point
: TP1(FFE801
4
pin),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. DC BALANCE ADJUSTMENT
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.
V
DIGITAL MULTIMETER
TP1
GND
V
DIGITAL MULTIMETER
TP1
GND
V
DIGITAL MULTIMETER
VT
GND
V
DIGITAL MULTIMETER
VT
GND
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