Sony CDX-M9900 Service Manual page 18

CDX-M9900/M9905X
• IC501 MB90F474HPFV-G-178 (SYSTEM CONTROL) (MAIN BOARD (3/3)) (US, Canadian MODEL)
• IC501 MB90F474HPFV-G-179 (SYSTEM CONTROL) (MAIN BOARD (3/3)) (AEP, UK, E MODEL)
Pin No. Pin Name
1 PG
2 FLASH P ON
3 BEEP
4 MOTOR ON
5 MOT +
6 MOT –
7 LED ON
8 FSW IN
9 VSS
10 BOOST
11 ENCSW1
12 ENCSW2
13 to 16 NCO
17 T.ROM SDA
18 T.ROM SCK
19, 20 NCO
21 VCC5
22 NS MASK
23 TU MUTE
24 FLASHW
25 SH3SI/FLSSI
26 SH3SO/FLSSO
27 UNI AU
28 VOLATT
29 DIAG
30 AMP ON
31 I2CCKO
32 I2CSIO
33 AVCC
34 AVRH
35 AVSS
36 KEYIN0
37 TEMP TR
38 FP IDET
39 QUALITY (RDS)
40 VSS
41 RC IN0
42 VSM
43, 44 NCO
45 KEY ACK
46 DAVN (RDS)
47, 48 MD0, MD1
49 MD2
50 NCO
51 BU IN
52 to 54 NCO
55 MUTE CON
56 UNISI
57 UNISO
18
I/O
I Power supply OK detection signal input for DC-DC converter
Flash write communication signal change control signal output
O
L: SH-3 communication, H: PC Ver. UP communication
O BEEP signal output Used to PPG function.
O Motor power supply on signal output
O Open/close motor control signal output (+)
O Open/close motor control signal output (–)
O CD side illumination on signal output when front panel open
I DC-DC converter oscillator frequency count signal input Used to input capture.
— Ground pin
O Boost signal output
I ENC switch 1 signal input
I ENC switch 2 signal input
O Not used in this set. (Open)
I/O Tuner EEPROM serial data signal input/output
O Tuner EEPROM serial clock signal output
O Not used in this set. (Open)
— Power supply pin (+5 V)
O Tuner noise mask signal output
O Tuner mute signal output
I Flash write mode detection signal input
I SH3 communication signal input (RXD)/Flash write data signal input
O SH3 communication signal output (TXD)/Flash write data signal output
BUS audio in/AUX audio in select control signal output
O
H: SONY BUS audio, L: AUX audio
O Electronic volume mute signal output
I Condition signal input from power amplifier IC
O AMP STB signal output Used to control of power amplifier IC. L: Off, H: On
O Serial clock signal output for tuner and electronic volume IC
I/O Serial data signal input/output for tuner and electronic volume IC
— Power supply pin (+3.3 V)
— Power supply pin (+3.3 V)
— Ground pin
I key signal input Used to A/D port.
I Temperature detection signal input for front panel motor control Used to A/D port.
I Front panel operation current detection signal input Used to A/D port.
I Tuner noise detection signal input Used to A/D port.
— Ground pin
I Rotary commander signal input Used to A/D port.
I S meter voltage signal input Used to A/D port.
O Not used in this set. (Open)
I Key acknowledge detection signal input H: On (Used to interruption port.)
I RDS data block synchronization detection signal input
— Connected to power supply pin (+5 V)
— Connected to ground pin
O Not used in this set. (Open)
I Back up power supply detection signal input Used to interruption port.
O Not used in this set. (Open)
I Mute condition signal input Used to interruption port.
I SONY BUS data signal input Used to serial port.
O SONY BUS data signal output Used to serial port.
Pin Description