Samsung MAX-870 Service Manual page 29

6-1-3 Tuner Malfunction(FM/AM)
TZD1(7.5V), TZD2(5.1V)
Voltage normal?
Tuner BAND Switching ?
VT Level Changeable?
If input normal ?
Check the Main PCB
FIC2 (TDA7439)
Function IC
Samsung Electronics
Main PCB
Yes
TIC1 (LA1836)
(pin 14)
Yes
TIC2 (LC72131)
(pin 20)
Yes
TIC2 (LA1836)
(pin 1,5)
Yes
Check the Main PCB
No
TZD1 (7.5V), TZD2 (5.1V)
TR38,TR53
Check the Main PCB
No
TIC2 (LC72131)
pin3,4,5,6
Check the Front PCB
UIC1 ( -com)
Check the Main PCB
No
TIC2 (LC72131) Oscillator
TX2 (7.2MHz)
Check the Main PCB
No
TFE1 (Front END Pack)
TL1 (MW/LW coil)
Troubleshooting
6-3