Read Sony HCD-GX750 / HCD-RG551 / HCD-RX550 / MHC-GX750 / MHC-RG551S Service Manual online
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HCD-GX750/RG551/RX550
• IC601 LC876996A-53H2-E (SYSTEM CONTROLLER) (PANEL BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
O-MP3 CS
O
CS signal output to CD digital processor
2
O-MP3 LP MOTER
O
LP signal output to CD digital processor and motor signal output
3
I-MP3 ACK SOL-B
I
ACK signal input from CD digital processor and motor signal input
4
O-MP3 REQ SOL-A
O
REQ signal output to CD digital processor and motor signal output
5
I-SCOR
I
CD scor signal input
6
O-MP3 RESET
O
RESET signal output to CD digital processor
7
I-BU1924 DATA
I
Data signal input Connect to ground in this set.
8
I-BU1924 CLK
I
Clock signal input
9
I-VOLUME-IN1
I
Volume signal input from the encoder
10
I-VOLUME-IN2
I
Volume signal input from the encoder
11
RESET
I
Reset signal input
12
I-XT1
I
Connection for input a crystal resonator (32.768 kHz)
13
I-XT2
O
Connection for input a crystal resonator (32.768 kHz)
14
VSS1
—
Ground pin
15
CF1
I
Connection for input a ceramic resonator (10 MHz)
16
CF2
O
Connection for input a ceramic resonator (10 MHz)
17
VDD1
—
Power supply pin (+1.5 V)
18
I-PROTECT
I
Power amplifier circuit protection signal input
19
WFR/HP/MIC-IN
I
SubWoofer or Headphone detection signal input
20
I-CD ENCODER
I
Signal input from the CD encoder
21
I-CD OPEN/CLOSE
I
CD tray open switch signal input
22
I-TAPE A START
I
TAPE A switches signal input
23
I-TAPE B START
I
TAPE B switches signal input
24
I-STREAM/VACS
I
Stream/Vacs signal input
25
I-KEY 3
I
Function key input 3
26
I-KEY 2
I
Function key input 2
27
I-KEY 1
I
Function key input 1
28
I-SIRDS-IN
I
Data signal input from the remote contorol receiver
29
I-AC CUT
I
Power down signal input
30 to 42
G13 to G1
O
FL tube grid signal output
43 to 45
S1 to S3
O
FL tube segment signal output
46
VDD3
—
Power supply pin (+3.3 V)
47 to 49
S4 to S6
O
FL tube segment signal output
50
S7/METER-SW1
O
FL tube segment signal output
51
–VPP
—
Power supply (–) pin (–26 V)
52
S8/METER-SW2
O
FL tube segment signal output
53
S9/METER-SW3
O
FL tube segment signal output
54 to 63
S10/SW1 to S19/SW10
O
FL tube segment signal output
64, 65
S20, S21
O
FL tube segment signal output
66
I-SPEC/MODEL/METER
I
METER swich signal input
67
I-TUNED-IN
I
Tuning frequency signal input
68
I-STEREO-IN
I
Stereo tuning signal input
69
I-AMS-IN
I
AMS signal input
70
I-REEL-A-IN
I
A deck photo sensor signal input
71
I-REEL-B-IN
I
B deck photo sensor signal input
72
VDD4
—
Power supply pin (+3.3 V)
73
I-CD NUM SENSOR
I
Table address sensor swich signal input
74
O-POWER-RELAY
O
POWER RELAY control signal output
75
O-SYSTEM-MUTE
O
System muting signal output
76
O-POWER-LED
O
POWER LED control signal output
77
STREAM-LED6/SOL B
O
Illumination LED control signal output
78
STREAM-LED5/SOL A
O
Illumination LED control signal output
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