Read Sony HCD-RG55 / HCD-RG55S / MHC-RG55 / MHC-RG55S Service Manual online
2
HCD-RG55/RG55S
1. IC PIN DESCRIPTION
• IC801 LC876662B-5Z81 (MASTER CONTROL) (PANEL BOARD)
Pin No.
Pin Name
I/O
Description
1
PWR LED
O
PWR LED control signal output
2
P.S.RELAY
O
Standby relay control signal output
3
SYS MUTE
O
System muting signal output
4
CD CLOSE
I
CD tray close switch signal input
5
CD RWC/F.CLOCK
O
Read/write control signal output
6
CD WRQ/F.DATA
I
Subcode Q standby signal input
7
FLASH R/W
—
Fixed at “H”
8
CD DRF
I
RF level detection signal input
9
AMS IN
I
AMS signal input
10
BU1924 DATA
I
Data input from the RDS decoder IC
11
RESET
I
Reset signal input
12
XT1
I
Connection for a crystal resonator (32.768 MHz)
13
XT2
O
Connection for a crystal resonator (32.768 MHz)
14
VSS
—
Ground pin
15
CF1
I
Connection for a ceramic resonator (10 MHz)
16
CF2
O
Connection for a ceramic resonator (10 MHz)
17
VDD1
—
Power sypply pin (+5 V)
18
TAPE A STAT
I
TAPE A switches signal input
19
TAPE B STAT
I
TAPE B switches signal input
20
VACS
O
VACS control signal output
21
SPEANA IN H
I
Spectrum analyzer signal input
22
SPEANA IN MH
I
Spectrum analyzer signal input
23
SPEANA IN M
I
Spectrum analyzer signal input
24
SPEANA IN L
I
Spectrum analyzer signal input
25
KEY INPUT 0
I
Function key input
26
KEY INPUT 1
I
Function key input
27
KEY INPUT 2
I
Function key input
28
PWR DOWN
I
Power down signal input
29
BU1924 CLK
I
Clock input from the RDS decoder IC
30 to 42
G13 to G01
O
FL tube grid signal ouput
43 to 45
P01 to P03
O
FL tube segment signal ouput
46
VDD
—
Power supply pin (+5 V)
47 to 50
P04 to P07
O
FL tube segment signal ouput
51
VPP
—
Power supply (negative) pin (–28 V)
52 to 64
P08 to P20
O
FL tube segment signal ouput
65
P21 OP. OUT 10(SW10)
to
to
O
FL tube segment signal output or switch signal output
68
P24 OP. OUT 07(SW07)
69
P25 OP. OUT05(SW06)
to
to
O
FL tube segment signal output or switch signal output
71
P27OP. OUT 03(SW04)
72
VDD
—
Power supply pin (+5 V)
73
P28 OP. OUT 02(SW03)
to
to
O
FL tube segment signal output or switch signal output
75
P30 OP. OUT 00(SW01)
76
OP. SW IN
I
Switch signal input
(MODE SW IN)
77
PROTECTOR SENSOR
I
Power amplifier circuit protection signal input
78
HEADPHONE SENSOR
I
Headphone detection signal input
79
CD SENS
I
Table address sensor signal input
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