Pioneer DEH-4280SD Service Manual page 11

1
FM/AM TUNER UNIT
A
AM ANT
FMRF
1 ATT
A
FM ANT
3 ATT
FMRF
B
RF adj
ANT adj
C
D
E
F
22
1
2
7 6 13 5 10 9 8
IC3 5V → 3.3V
EEPROM 5.0V
OSC
LPF
IC1
3.3V
MIXER, IF AMP
T51
CF52
IC4
3.3V → 2.5V
3.3V
2 12 15 22 16 4 17
A
DEH-4250SD/XNES
2
3
A
11 14 18 19 20 21
IC5
IC2
2.5V
DET, FM MPX
2.5V
3
4
Lch
23 A
4