Aiwa XR-EM50K Service Manual page 52

< TUNER SECTION >
TUNER C.B (COMPONENT SIDE)
L952
L953
L941
TC942
L905
L902
L904
L901
1.CLOCK CHECK
Requirement
Measuring equipment: Frequency counter
Test point: TP1 (CLK), GND
(1) Adjust the reception frequency of the main unit to 1710kHz.
(2) Check that the test point frequency is 2160kHz ± 0.045kHz.
2.VT ADJUSTMENT (LW)
Requirement
Measuring equipment: Digital multi-meter
Test point: TP4 (R962), GND
Adjustment point: L942
(1) Adjust the reception frequency of the main unit to 144kHz.
(2) Adjust L942 until the test point voltage (VT) is 1.3V ± 0.05V.
3.VT CHECK (MW)
Requirement
Measuring equipment: Digital multi-meter
Test point: TP4 (R962), GND
(1) Adjust the reception frequency of the main unit to 531kHz.
(2) Check that the test point (VT) voltage is about 0.5V.
(3) Adjust the reception frequency of the main unit to 1602kHz.
(4) Check that the test point (VT) voltage is below 8.0V.
4.VT ADJUSTMENT (FM)
Requirement
Measuring equipment: Digital multi-meter
Test point: TP4 (R962), GND
Adjustment point: L907
(1) Adjust the reception frequency of the main unit to 108.0MHz.
(2) Adjust L907 until the test point voltage (VT) is 7.0V ± 0.1V.
(3) Adjust the reception frequency of the main unit to 87.5MHz.
(4) Check that the test point (VT) voltage is about 0.5V.
CN991
IC991
L942
IC801
L802
L907
TUNER C.B (CONDUCTOR SIDE)
CN991
⑦ TP8 11pin
TP9 12pin
②
⑧
TP1(24pin)
IC801
⑥
④
⑨
– 52 –
GND 8pin
TP4
TP2
R962
R815
TP3
TP
GND
TP
GND
TP
GND
TP
GND
① ②③ ④
⑥ ⑦⑧ ⑨
⑥ ⑦⑧⑨
①
② ③④
⑤
FREQUENCY COUNTER
Hz
DIGITAL MULTIMETER
V
DIGITAL MULTIMETER
V
DIGITAL MULTIMETER
V