Ic Pin Function Description - Sony MHC-GRX990 Service Manual

7-27. IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC501 M30622MA-A07FP (SYSTEM CONTROLLER (CD MECHANISM CONTROL))
Pin No. Pin Name
1 STK-MUTE
2 POWER
3 F-RELAY
4 R-RELAY
5 CD-POWER
6 LINE-MUTE
7 DBFB-H/L
8
BYTE
9 CNVSS
10 XC-IN
11 XC-OUT
12 RESET
13 X-OUT
14 VSS
15 X-IN
16 VCC
17 NMI
18 WAKE UP
19 SCOR
20 RDS-INT
21 RDS-DATA
22 AC-CUT
23 PL-CLK
24 PL-DATA
25 PL-LAT
26 TIMER LED
27 PROTECTOR
28
V MUTE
29 IIC-CLK
30 IIC-DATA
31 NCO
32
SQ-DATA
33
SQ-CLK
34 SW MODE
35
CD-DATA
36 RY-SW
37 CD-CLK
38 493-LATCH
I/O
O
Power amplifier on/off selection signal output terminal "L": standby mode, "H": on
Power on/off control signal output for the audio system (+5V) and deck, panel, audio system
O
(+7V) "L": standby mode, "H": power on
O
Relay drive signal output for the speaker protect "H": relay on
O
Relay drive signal output for the speaker protect "H": relay on Not used (open)
Power on/off control signal output for the CD mechanism deck section
O
"L": standby mode, "H": power on
O
Line muting on/off control signal output terminal "L": muting on
DBFB normal/high selection signal output to the M62493FP (IC101)
O
"L": DBFB high, "H": DBFB low
I
External data bus line byte selection signal input terminal Fixed at "L" in this set
—
Ground terminal
I
Sub system clock input terminal (32.768 kHz)
O
Sub system clock output terminal (32.768 kHz)
System reset signal input from the reset signal generator (IC502) "L": reset
I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
O
Main system clock output terminal (16 MHz)
—
Ground terminal
I
Main system clock input terminal (16 MHz)
—
Power supply terminal (+5V)
I Non-maskable interrupt input terminal Fixed at "H" in this set
I
Wakeup control signal input from the fluorescent indicator tube driver (IC601) "H" active
I Subcode sync (S0+S1) detection signal input from the CXD2587Q (IC101) on the CD block
RDS serial data transfer clock signal input from the FM/AM tuner unit (Used for the AEP, UK,
I
German and North European models only)
RDS serial data input from the FM/AM tuner unit (Used for the AEP, UK, German and North
I
European models only)
I
AC off detection signal input from the reset signal generator (IC502) "L": AC cut checked
O
Serial data transfer clock signal output to the pro-logic circuit Not used (open)
O Serial data output to the pro-logic circuit Not used (open)
O
Serial data latch pulse output to the pro-logic circuit Not used (open)
O
LED drive signal output of the TIMER SELECT indicator (D636) "H": LED on
Protect on/off detection signal input from the speaker protect circuit
I
"L": protect on, "H": protect off
O
Muting on/off control signal output terminal "L": muting off Not used (open)
Communication data reading clock signal input or transfer clock signal output with the fluo-
I/O
rescent indicator tube driver (IC601)
I/O
Communication data bus with the fluorescent indicator tube driver (IC601)
O
Not used (open)
I
Subcode Q data input from the CXD2587Q (IC101) on the CD block
O
Subcode Q data reading clock signal output to the CXD2587Q (IC101) on the CD block
O Not used (open)
O
Serial data output to the CXD2587Q (IC101) on the CD block
Connection detect signal input of the headphone jack (J701)
I
"L": no connected, "H": headphone connected
O
Serial data transfer clock signal output to the CXD2587Q (IC101) on the CD block
O
Serial data latch pulse output to the M62493FP (IC101)
Description
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