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• MAIN BOARD IC600 MB90574BPMT-G-265-BND (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Description
1NCO
Not used (open)
2 AMSIN I Whether a music is present or not from CXA2510AQ (IC250) is detected at auto music sensor
“L”: music is present, “H”: music is not present
3 AMSON O Tape auto music sensor control signal output to the CXA2510AQ (IC250)
“L” is output to lower the gain for audio level at FF/REW mode
4 SA LAT O Serial data latch pulse output for spectrum analyzer section to the liquid crystal display drive
controller (IC800)
5 ATT O Audio line muting on/off control signal output terminal “H”: muting on
6 SYSRST O System reset signal output to the liquid crystal display drive controller (IC800) and SONY bus
interface (IC500) “L”: reset
7 F/R O Forward/reverse direction control signal output to the CXA2510AQ (IC250)
“L”: reverse direction, “H”: forward direction
8VCC—Power supply terminal (+5V)
9 TAPE ATT O Tape muting on/off control signal output to the CXA2510AQ (IC250) “H”: muting on
Active at ATA, FF/REW mode
10 T. ROM-SDA I/O Two-way data bus for tuner EEPROM with the FM/AM tuner unit (TUX1)
11 T. ROM-SCL I/O Two-way bus clock signal for tuner EEPROM with the FM/AM tuner unit (TUX1)
12 RX I Input terminal at the flash memory data write mode
Front panel open/close detection signal input terminal
“L” is input when the front panel is closed
13 TX O Output terminal at the flash memory data write mode
Display serial data output to the liquid crystal display driver (IC901)
14 BUS-ON OBus on/off control signal output to the liquid crystal display drive controller (IC800) and SONY
bus interface (IC500) “L”: bus on
15 BEEP O Beep sound drive signal output terminal
16 NC O Not used (open)
17 UNISI I Serial data input from the SONY bus interface (IC500)
18 UNISO O Serial data output to the SONY bus interface (IC500)
19 UNICKO OSerial clock signal output to the liquid crystal display drive controller (IC800) and SONY bus
interface (IC500)
20 IF-BW ITuner wide/narrow select signal input terminal “L”: wide, “H”: narrow
Not used (fixed at “L”)
21 SW SHIFT O Not used
22, 23 NC O Not used (open)
24 SIRCS ISircs remote control signal input from the remote control receiver (IC951)
25 DSPSI ISerial data input from the CXD2726Q (IC100)
26 DSPSO OSerial data output to the CXD2726Q (IC100)
27 DSPCKO OSerial data transfer clock signal output to the CXD2726Q (IC100) and liquid crystal display drive
controller (IC800)
28 DSPPLL OPLL clock control signal output terminal Not used (open)
29 DSPMST OBit clock (BCK) and L/R sampling (LRCK) signal master/slave mode selection signal output
terminal “L”: master mode, “H”: slave mode Not used (open)
30 NC O Not used (open)
31 VOLATT OPre amplifier muting on/off control signal output to the electrical volume (IC10)
“L”: muting on
32 TUMUTE O Muting on/off control signal output of the FM/AM tuner signal “L”: muting on
33 VSS —Ground terminal
34 C —Connected to coupling capacitor for the power supply Not used (open)