JVC MX-GB6

1-38 (No.MB160)
5.2 Tuner malfunction (FM/AM) : COMMON
Main board
CW102 pin No.2, 9V
Voltage normal?
ICO1(LV23000)
of tuner board,
Tuner BAND Switching?
(pin29)
Check the Main board
EZD02
No
Yes
Check the Tuner board
ICO1(LV23000)
pin 15,16,17,18
Check the Front board
UIC1 (micon).
No
ICO1(LV23000)
VT Level Changeable?
(pin28)
Yes
Check the Front board
ICO1(LV23000) Oscillator
XTAL (75kHz)
No
ICO1(LV23000)
If input normal?
(pin 1,4)
Yes
Check the Tuner board,
FM pack,MW OSC,
MW ANT.
No
Yes
Check the Main board
EIC01(TDA7442D) Function IC