XR-C8220 Datasheet, PDF (11/14 Pages) Sony Corporation – SERVICE MANUAL

6-16. IC PIN FUNCTION DESCRIPTION
• MAIN BOARD IC600 MB90574PFV-G-182-BND (SYSTEM CONTROLLER)
Pin No. Pin Name I/O
Function
Seek control signal output to the FM/AM tuner unit (TUX10)
1
SEEKOUT
O ^{AM mode: Used for IF count output/SD output request/AGC cut at SEEK or BTM}
FM mode: Used for SD speed up at SEEK, BTM, or AF
“L” is output at tuner off
2
AF-SEEK
O ^{PLL low-pass filter time constant selection signal output at AF SEEK}
“H” is output when AF SEEK Not used (open)
IF band select signal output to the FM/AM tuner unit (TUX10) “H”: wide mode
3
WIDE
O
In receiving FM signals, interference noise from adjacent stations is removed by narrowing the
IF band automatically in the tuner unit so as to raise the selectivity, but in this case, the distortion
may increase and accordingly, the IF band is widened forcibly
FM stereo broadcasting detection signal input from the FM/AM tuner unit (TUX10), or forced
4
ST-MONO I/O monaural control signal output to the FM/AM tuner unit (TUX10)
“L” is input in the FM stereo mode, or “L” is output in the forced monaural mode
5
TUNMUTE O Muting on/off control signal output of the FM and AM tuner signal “H”: muting on
6
FM-ON
O
FM system power supply on/off control signal output to the BA3918 (IC502)
“L”: AM power on, “H”: FM power on
7
TU-ON
O
Tuner system power supply on/off control signal output to the BA3918 (IC502)
“H”: tuner power on
8
VCC
— Power supply terminal (+5V)
9
CSV-RST
O Reset signal output to the CSV (IC650) “L”: reset
10
BUS-ON
O Bus on/off control signal output to the SONY bus interface (IC602) “L”: bus on
11
SYSRST
O Reset signal output to the SONY bus interface (IC602) “L”: reset
12
DOORSW
I Front panel open/close detection signal input “L” is input when the front panel is closed
13
LCD SO
O Serial data output to the liquid crystal display driver (IC900)
14
LCD CKO
O Serial data transfer clock signal output to the liquid crystal display driver (IC900)
15
BEEP
O Beep sound drive signal output terminal
16
LCD CE
O Chip enable signal output to the liquid crystal display driver (IC900) “H” active
17
UNISI
I Serial data input from the SONY bus interface (IC602)
18
UNISO
O Serial data output to the SONY bus interface (IC602)
19
UNICKO
O Serial data transfer clock signal output to the SONY bus interface (IC602)
20
SD-IN
I
Station detector detect input from the FM/AM tuner unit (TUX10)
Stop level for SEEK, BTM, etc. is determined SD is present at input of “H”
21
CSV-SO
O Serial data output to the CSV (IC650)
22
CSV-CKO
O Serial data transfer clock signal output to the CSV (IC650)
23
CSV-CE
O Chip enable signal output to the CSV (IC650) “L” active
24
SIRCS
I Sircs remote control signal input from the remote control receiver (IC901)
25
PLLSI
I PLL serial data input from the FM/AM PLL (IC10)
26
PLLSO
O PLL serial data output to the FM/AM PLL (IC10)
27
PLLCKO
O PLL serial data transfer clock signal output to the FM/AM PLL (IC10)
28
PLLCE
O PLL chip enable signal output to the FM/AM PLL (IC10) “H” active
Power on/off control signal output of the illumination LED and liquid crystal display driver
29
ILL-ON
(IC900) “H”: power on Depends on initial setting of power select switch (S600)
O _{Power select switch (S600) on: “H” output at the accessory on}
Power select switch (S600) off: “H” output at the power on
Dimmer control in/out terminal
30
DIMMER
I/O ^{At initial mode: The presence of dimmer select function is set (if this status, if “L” is input, the}
dimmer select function is present)
At normal mode: LCD back light brightness control signal output
31
TIR-IND
O LED drive signal output of the TIR indicator “H”: LED on Not used (open)
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