Printed Wiring Boards - Main Section; 6-5. Ic Pin Function Description - Sony XR-4750RDS Service Manual

6-5. IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC501 MN1884820S4G (XR-4750RDS), MN1886426S4H (XR-C450RDS) (SYSTEM CONTROLLER)
Pin No. Pin Name
1 TUNMUT
2 AMPON
3
4
5 AMPMUT
6
7
8
9
10
11
12 XT OUT
13
14
15 RDSCKI
16
17 KEYACK
18 VOLSO
19 VOLCKO
20 VOLCE
21 TAPMUT
22 LM LOD
23
24 AMSON
25 N ROUT
26
27
28 PLLCKO
29
30
31
32 DOLON
33 MTLON
34 CM ON
35 TAPON
36 ACCON
37
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I/O
O Tuner muting control pin At muting: "H"
O Power amp power supply control pin
Illumination power supply control pin
ILLON O At PW SEL on: ACC on: "H"
At PW SEL off: Power on: "H"
PW ON O System power supply control pin
O Power amp muting control pin At muting: "L"
RC IN1 I Rotary remote commander input pin (A/D input)
VDD – Power supply
X IN I Main system clock input pin (8 MHz)
X OUT O Main system clock output pin (8 MHz)
GND – GND
XT IN I Sub system clock input pin (32.768 kHz)
O Sub system clock output pin (32.768 kHz)
EX2 – Connected to GND
RESET I Reset input pin
I RDS clock input pin
BU IN I Back up power supply detection pin
O Key acknowledge signal input pin
O Data output pin to electrical volume
O Clock output pin to electrical volume
O Chip enable output pin to electrical volume
O Tape muting control pin At muting: "H"
O Loading motor control pin (loadig direction)
LM EJ O Loading motor control pin (eject direction)
O At AMS: "L"
O Forward/reverse control pin
AMSIN I Tape music with/without detection pin "L": with music
PLLSO O PLL data output pin
O PLL clock output pin
PLLCE O PLL chip enable output pin
RDSSI I RDS data input pin
AD ON O Power supply control pin for A/D conversion
DOLBY control input/output pin (Fixed at "H" in this set)
I/O At initial mode: valid/invalid selection input of DOLBY function
At normal mode: DOLBY on/off output
METAL control input/output pin
I/O At initial mode: valid/invalid selection input of METAL function
At normal mode: METAL on/off output "H": on
O Capstan motor control pin
O Tape power supply control pin
I Accessory voltage detection pin
PLLSI I PLL data input pin
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Function
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