Fm/Am Tuner Unit Diagram - Pioneer AVH-P6800DVD Service Manual

1
- FM/AM Tuner Unit
A
AM ANT
FMRF
1 ATT
FM ANT
3
ATT
FMRF
B
ANT adj
No. Symbol I/O Explain
C
1 AMANT
2 RFGND
3 FMANT
4 VCC
L O signal level
6 CE2
7 WC
8 CE1
D
10 DI
11 NC
12 OSCGND
13 ROM_VDD
14 DO O data out
15 DGND
16 NC
17 VDD_3.3
18 NC
19 NC
E
20 NC
21 NC
22 AUDIOGND
23 L ch O L channel output
24 R ch O R channel output
F
180
1
2
7 6
IC 3 EEPROM
5.0 V
OSC
IC 1
3.3 V
MIXER, IF AMP
RF adj
T51
2 12 15 22 16
I AM antenna input AM antenna input high impedance AMANT pin is connected with
an all antenna by way of 4.7 µH. (LAU type inductor) A series circuit
including an inductor and a resistor is connected with RF ground for
the countermeasure against the hum of power transmission line.
RF ground g Ground of antenna block
Input of FM antenna 75 Ω Surge absorber
I FM antenna input
power supply The power supply for analog block. D.C 8.4 V
g
I chip enable-2
I write control Y Y
Ordinary non connection
I chip enable-1 Chip enable for AF•RF "High
clock Clock
I data in Data input
non connection Not used
osc ground g Ground of oscillator block
power supply Power supply for EEPROM pin 13 is connected with a power supply of
micro computer.
Data output
digital ground g g Ground of digital block
non connection Not used
power supply The power supply for digital block. 3.3 V
non connection Not used
non connection Not used
non connection Not used
non connection Not used
audio ground g
FM stereo "L-ch" signal output or AM audio output
FM stereo "R-ch" signal output or AM audio output
AVH-P6800DVD/UC
2
3
13 5 10 9 8 11 14 18 19 20 21
IC 5
5 V 3.3 V
LPF
CF52
CF51
IC 4
3.3 V 2.5 V
2.5 V
3.3 V
4 17
g
g
g
"Low" active
g " active
g
g
g
3
4
Rch
24
IC 2
2.5 V
Lch
23
DET, FM MPX
(DSP-201M-S00B) is necessary.
± 0.3 V
"Low".
± 0.2 V
4