Read Sony XR-4740RDS / XR-C430RDS / XR-C440RDS Service Manual online
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6-5.
IC PIN FUNCTION DESCRIPTION
MAIN BOARD IC501 MN1884820S4G (4740RDS) (MASTER CONTROLLER)
IC501 MN1886426S4H (C430RDS/C440RDS) (MASTER CONTROLLER)
1
TUNMUT
O
Tuner muting control pin
At muting: “H”
2
AMPON
O
Power amp power supply control pin
Illumination power supply control pin
3
ILLON
O
At PW SEL on: ACC on: “H”
At PW SEL off: Power on: “H”
At PW SEL off: Power on: “H”
4
PW_ON
O
System power supply control pin
5
AMPMUT
O
Power amp muting control pin
At muting: “L”
6
RCIN1
I
Rotary remote commander input pin (A/D input)
7
VDD
–
Power supply
8
X_IN
I
Main system clock input pin (8 MHz)
9
X_OUT
O
Main system clock output pin (8 MHz)
10
GND
–
GND
11
XT_IN
I
Sub system clock input pin (32 kHz)
12
XT_OUT
O
Sub system clock output pin (32 kHz)
13
EX2
–
Connected to GND
14
RESET
I
Reset input pin
15
RDSCKI
I
RDS clock input pin
16
BU_IN
I
Back up power supply detection pin
17
KEYACK
O
Key acknowledge signal input pin
18
VOLSO
O
Data output pin to electrical volume
19
VOLCKO
O
Clock output pin to electrical volume
20
VOLCE
O
Chip enable output pin to electrical volume
21
TAPEMUT
O
Tape muting control pin. At muting: “H”
22
LMLOD
O
Loading motor control pin (loadig direction)
23
LMEJ
O
Loading motor control pin (eject direction)
24
AMSON
O
At AMS: “L”
25
N_ROUT
O
Forward/reverse control pin
26
AMSIN
I
Tape music with/without detection pin
“L”: with music
27
PLLSO
O
PLL data output pin
28
PLLCKO
O
PLL clock output pin
29
PLLCE
O
PLL chip enable output pin
30
RDSSI
I
RDS data input pin
31
AD_ON
O
Power supply control pin for A/D conversion
DOLBY control input/output pin (Fixed at “H” in this set)
32
DOLON
I/O
At initial mode: valid/invalid selection input of DOLBY function
At normal mode: DOLBY on/off output
At normal mode: DOLBY on/off output
METAL control input/output pin (Fixed at “H” in this set)
33
MTLON
I/O
At initial mode: valid/invalid selection input of METAL function
At normal mode: METAL on/off output
At normal mode: METAL on/off output
“H” : on
34
CMON
O
Capstan motor control pin
35
TAPON
O
Tape power supply control pin
36
ACCON
I
Accessory voltage detection pin
37
PLLSI
I
PLL data input pin
38
BEEP
O
Beep sound output pin
Pin No.
Pin Name
I/O
Function
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