Pioneer KEH-P4800 Service Manual page 33

KEH-P4800,P4850
- Pin Functions (PD6278A)
Pin No. Pin Name
1-5 SEG4-0
6-9 COM3-0
10 V3
11-14 KS4-1
15,16 KD1,2
17 REM
18 RXD
rst
19
20 TXD
21 MODA
22 X0
23 X1
24 VSS
25,26 KD3,4
27,28 KS6,5
29-55 SEG39-13
56 VCC
57-64 SEG12-5
PML003AM
VCC IN1_R IN2_R
28 27 26
1 2 3
Vref IN1_L IN2_L
44
I/O Function and Operation
O LCD segment output
O LCD common output
LCD drive power supply
O Key strobe output
I Key data input (analogue input)
I Remote control reception
I System micro computer UART communication data input
I System reset
O System micro computer UART communication data output
GND
Crystal oscillator connection pin
Crystal oscillator connection pin
GND
I Key data input
O Key strobe output
O LLCD segment output
Power supply
O LCD segment output
IN3_R IN4+_R IN4-_R AGND
25 24 23
Isolator
circuit
Anti Alias
filter
Primary
volume
Auto-Zero
Primary
Auto-Zero
volume
Anti Alias
filter
Isolator
circuit
4 5 6
IN3_L IN4+_L IN4-_L AGND Loud-
Loud- Front-
out_R SVin_R out_R
22 21 20 19
Anti radiation
filter
Loudness
volume
Treble
Bass
Middle
Middle Bass
Treble
Loudness
volume
Anti radiation
filter
7 8 9 10
SVin_L Front-
out_L out_L
Rear-
out_R FIE_R
STB
18 17 16
FIE
Fader
Secondary
volume
volume
Zero cross
detect circuit
Digital block
Zero cross
detect circuit
Fader
Secondary
volume
volume
FIE
11 12 13
Rear- FIE_L DGND
out_L
DATA
15
14
CLK