21
• IC502 MB90574PMT-G-263-BND (SYSTEM CONTROL) (MAIN BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
NIL
I
Not used (fixed at “L”)
2
AMSIN
I
Input terminal of whether a music is present or not is detected at auto music sensor
“L”: music is not present, “H”: music is present Not used (fixed at “L”)
3
AMSON
O
Tape auto music sensor control ssignal output terminal
“L” is output to lower the gain for audio level at FF/REW mode Not used (open)
4
SP LAT
O
Serial data latch pulse output for spectrum analyzer section to the liquid crystal
display drive controller (IC701)
5
ATT
O
Audio line muting on/off control signal output terminal “L”: muting on
6
SYSRST
O
System reset signal output to the MD mechanism controller (IC501), liquid crystal
display drive controller (IC701) and SONY bus interface (IC601) “L”: reset
7
F/R
O
Tape detection signal output terminal “L”: reverse side, “H”: forward side
Not used (open)
8
VCC
—
Power supply terminal (+5 V)
9
MTLIN
I
Auto metal detection signal input terminal Not used (fixed at “L”)
10
E2PSIO
I/O
Two-way data bus for tuner EEPROM with the FM/AM tuner unit (TUX201)
11
E2PCKO
O
Tuner EEPROM bus clock signal output to the FM/AM tuner unit (TUX201)
12
FLS SI
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
FLS SO
O
Output terminal at the flash memory data write mode
Display serial data output to the liquid crystal display driver (IC901)
14
BUS-ON
O
Bus on/off control signal output to the CD mechanism controller (IC5), liquid crystal
display drive controller (IC701) and SONY bus interface (IC601) “L”: bus on
15
BEEP
O
Beep sound drive signal output terminal
16
NCO
O
Not used (open)
17
UNISI
I
Serial data input from the SONY bus interface (IC601)
18
UNISO
O
Serial data output to the SONY bus interface (IC601)
19
UNICKO
O
Serial clock signal output to the CD mechanism controller (IC5), liquid crystal
display drive controller (IC701) and SONY bus interface (IC601)
20
IFWIDTH
I
Tuner wide/narrow select signal input terminal “L”: wide, “H”: narrow
Not used (fixed at “L”)
21
SWSHIFT
O
When the radio is tuned at the frequency to produce beats, shift the frequency of the
signal from the D/D converter so as to produce no beats.
22, 23
NCO
O
Not used (open)
24
SIRCS
I
Sircs remote control signal input from the remote control receiver (IC951)
25
DSPSI
I
Serial data input from the CXD2726Q (IC805)
26
DSPSO
O
Serial data output to the CXD2726Q (IC805)
27
DSPCKO
O
Serial data transfer clock signal output to the CXD2726Q (IC805) and liquid crystal
display drive controller (IC701)
28
DSPPLL
O
PLL clock control signal output to the CXD2726Q (IC805)
At “L” is output: fixed at “L” is PLCLK (pin
ia
of IC805 CXD2726Q )
At “H” is output: PLL clock signal output to the PLCLK (pin
ia
of IC805 CXD2726Q)
29
DSPMST
O
Bit clock (BCK) and L/R sampling (LRCK) signal master/slave mode selection signal
output to the CXD2726Q (IC805) “L”: master mode, “H”: slave mode
30
NCO
O
Not used (open)
31
VOLATT
O
Pre amplifier muting on/off control signal output to the electrical volume (IC301)
“L”: muting on
32
TU ATT
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
35
DSPLAT
O
Serial data latch pulse output to the CXD2726Q (IC805)
36
DSPRST
O
Reset signal output to the CXD2726Q (IC805) “L”: reset
