CMT-DC1K, HCD-DC1K - Sony Audio Service Manual (repair manual). Page 31

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HCD-DC1K
32
32
6-17.
IC  PIN  FUNCTION  DESCRIPTION
 MAIN BOARD   IC801   CXP83124A-050Q (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
TAPE-END
I
Tape end detect sensor input terminal    “H”: input when the tape end detected
2
RDS-IN
I
Serial data reading clock signal input from the RDS decoder    Not used (open)
3
REMOCON
I
SIRCS remote control signal input from the remote control receiver (IC802)
4
MOT-CON
O
Capstan/reel motor on/off control signal output terminal    “H”: motor on
5
C-DATA/
TU-DATA      
O
Serial data output to the DSP/SSP (IC101) (at CD function)
PLL serial data output to the tuner pack (at tuner function)
6
T-MODE
I
Head position detect switch input terminal    “L”: forward direction, “H”: reverse direction
7
REG-CON
O
Main system power supply on/off contorl signal output terminal    “H”: power on
8
C-CLK/TU-CLK
O
Serial data transfer clock signal output to the DSP/SSP (IC101) (at CD function)
PLL serial data transfer clock signal output to the tuner pack (at tuner funcion)
9
JOG-C (BASS)
I
Jog dial pulse input from the rotary encoder (C phase input)    Not used (fixed at “L”)
10
SOL-CON
O
Trigger plunger on/off control signal output terminal    “H”: plunger on
11
C-SQCK
O
Subcode Q data reading clock signal output ti the DSP (IC110) (at CD function)
12
C-SQSO/
RDS-DATA
I
Subcode Q data input from the DSP (IC101) (at CD function)
RDS serial data input from the RDS decoder (not used) (at tuner function)
13
TRAY-OPEN
O
Motor drive siganl output to the disc tray open/close motor driver (IC320)    “H”: active
14
HOLD
O
Automatic power control hold signal output to the RF Amp (IC103) 
15
TRAY-CLOSE
O
Motor drive signal output to the disc tray open/close motor driver (IC309)    “H”: active
16
JOG-D (BASS)
I
Jog dial pulse input from the rotary encoder (D phase input)    Not used (fixed at “L”)
17
TUNED
I
Tuning detection signal input from the LA1837M (IC1) (at tuner function)
18
SENSE2/
TU-COUNT
I
Internal status detection monitor input from the DSP (IC101) (for MIRR, DFCT2, etc.) (at CD 
function)
PLL count data input from the tuner pack (at tuner function)
19
C-LATCH/
TU-CE
O
Serial data latch pulse output to the DSP (IC101) (at CD function)
PLL serial chip enable signal output to the tuner pack (at tuner function)
20
JOG-B
I
Jog dial pulse input from the rotary encoder (RV801 VOLUME) (B phase input)
21
JOG-A
I
Jog dial pulse input from the rotary encoder (RV801 VOLUME) (A phase input)
22
AMP-MUTE
O
Muting on/off control signal output to the power amplifier (IC101, 201)     “H”: muting on
23
JOG-G
I
Jog dial pulse input from the rotary encoder (G phase input)    Not used (fixed at “L”)
24
HP-CHK
I
Headphone jack in/out check detection signal input terminal
25
TU-ON
O
Power supply on/off control signal output of the tuner section (FM +7.5V)
LED drive signal output of the TUNER/BAND indicator (D853)
“H”: tuner power on (LED on)
26
D. S. G.
O
LED drive signal output of the DSG (Dynamic Sound  Generator) indicator (D854)
“H”: LED on
27
CD-SYNC
O
LED drive signal output of the CD SYNC indicator (D856)    “H”: LED on
28
SCK
O
Serial data transfer clock signal output to the BD3861FS (IC323)
29
JOG-E
I
Jog dial pulse input from the rotary encoder (E phase input)    Not used (fixed at “L”)
30
JOG-F
I
Jog dial pulse input from the rotary encoder (F phase input)    Not used (fixed at “L”)
31
JOG-H
I
Jog dial pulse input from the rotary encoder (H phase input)    Not used (fixed at “L”)
32
TC-SW
I
Half detect (side A and B) switch and cassette in detect switch input terminal (A/D input) 
33
TRAY-SW
I
Disc tray position detect switch (S1) input terminal (A/D input)
 “L”: close position,  “M”: open position,  “H”: moving
34
KEY3
I
Key input terminal (A/D input)    S813 to S816 (TUNER/BAND, TUNING +/–, FUNCTION
input)
35
KEY2
I
Key input terminal (A/D input)    S801 to S806 (I/1, CD u/x/M/m/Z keys input)
36
KEY1
I
Key input terminal (A/D input)
S807 to S812 (TAPE n N/x/M/m/X, CD SYNC keys input)
Pin No.
Pin Name
I/O
Description
37
SIMUKE/TEST
I
Destination setting terminal (A/D input)
38
RESET
I
System reset signal input from the reset signal generator (IC803)    “L”: reset
For several hundreds msec. after the power supply rises,  “L”: is input, then it changes to “H”
39
EXTAL1
O
Main system clock input terminal (4.19MHz)
40
XTAL1
O
Main system clock output terminal (4.19MHz)
41
VSS
Ground terminal
42
XTAL2
O
Sub system clock output terminal (500kHz)    Not used (open)
43
EXTAL2
I
Sub system clock input terminal (500kHz)    Not used (fixed at “L”)
44
AVREF
I
Reference voltage (+5V) input terminal (for A/D conversion)
45
AVSS
Ground terminal (for A/D conversion)
46
VL
O
Liquid crystal display bias on/off control signal output terminal
47 to 49
VLC3 to VLC1
Power supply terminal for the liquid crystal display bias
50 to 53
COM0 to COM3
O
Common drive signal output to the liquid crystal display (LCD801)
54 to 85
SEG0 to SEG31
O
Segment drive signal output to the liquid crystal display (LCD801)
86
C-XRST/FM ON
O
Reset signal output to the DSP (IC101) and BA5974FP (IC102) (at CD function)
FM power supply ON/OFF control signal output to the tuner section (FM +7.5V
(at tuner function)
87
REC-MUTE
O
Recording muting on/off selection signal output to the Tape section    “H”: muting on
88
SDA
O
Serial data output to the BD861FS (IC323)
89
VDD
Power supply terminal (+5V)
90
NC
Not used (open)
91
VSS
Ground terminal
92
TX
O
Sub system clock output terminal (32.768kHz)
93
TEX
I
Sub system clock input terminal (32.768kHz)
94
CD-ON
O
Power supply on/off control signal output of the CD section (+5V)
LED drive signal output of the CD u indicator (D852)    “H”: CD power on (LED on)
95
REC/PB
O
Recording/playback selection signal output to the BA3126N (IC402)
“L”: playback mode, “H”: recording mode
96
L-MUTE
O
Line muting on/off selection signal output to the Tape section    “H”: muting on
97
AU-MUTE
O
Muting on/off control signal output terminal    “H”: muting on
98
TC-ON
O
Power supply on/off control signal output of the cassette holder back light
LED drive signal output of the TAPE n N indicator (D855)    “H”: back light on (LED on)
99
WP
I
Wakeup control signal input terminal
100
C-SCOR
I
Subcode sync (S0+S1) detection signal input from DSP on the CD section (at CD function)
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