Sony MDX-C8900R Service Manual page 65

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• MAIN BOARD IC500 MB90574PFV-G-131-BND (MASTER CONTROLLER)
Pin No. Pin Name
1 SEEKOUT
2 AF SEEK
3
WIDE
4 ST-MONO
5 TU-ATT
6
FM-ON
7
TU-ON
8 VCC
9
CSV-RST
10 BUS-ON
TE
L 13942296513
11 SYSRST
12 DOORSW
13 LCD SO
14 LCD CKO
15 BEEP
16 LCD CE
17 UNISI
18 UNISO
19 UNICKIO
20 CSV-SI
21
CSV-SO
22
CSV-CKO
23
CSV-CE
24 SIRCS
25 PLLSI
26 PLLSO
27 PLLCKO
28 PLLCE
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ILL-ON
.
30 DIMMER
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I/O
Seek control signal output to the FM/AM tuner unit (TU1)
AM mode: Used for IF count output/SD output request/AGC cut at SEEK or BTM
O
FM mode: Used for SD speed up at SEEK, BTM, or AF
"L" is output at tuner off
PLL low-pass filter time constant selection signal output at AF SEEK
O
"H" is output when AF SEEK
IF band select signal output to the FM/AM tuner unit (TU1) "H": wide mode
In receiving FM signals, interference noise from adjacent stations is removed by narrowing the
O
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 (TU1), or forced
I/O
monaural control signal output to the FM/AM tuner unit (TU1)
"L" is input in the FM stereo mode, or "L" is output in the forced monaural mode
O Muting on/off control signal output of the FM and AM tuner signal "H": muting on
FM system power supply on/off control signal output to the BA3918 (IC506)
O
"H": FM power on, "L": AM power on
Tuner system power supply on/off control signal output to the BA3918 (IC506)
O
"H": tuner power on
— Power supply terminal (+5V)
O
Reset signal output to the RSC-164 (IC901) and flash memory (IC902)
Bus on/off control signal output to the MD mechanism controller (IC501) and SONY bus
O
interface (IC504) "L": bus on
Reset signal output to the MD mechanism controller (IC501) and SONY bus interface (IC504) "
O
L": reset
I
Front panel open/close detection signal input "L" is input when the front panel is closed
O Serial data output to the liquid crystal display driver (IC900)
O Serial data transfer clock signal output to the liquid crystal display driver (IC900)
O Beep sound drive signal output terminal
O Chip enable signal output to the liquid crystal display driver (IC900) "H" active
I Serial data input from the SONY bus interface (IC504)
O Serial data output to the SONY bus interface (IC504)
Serial data transfer clock signal in/out terminal with the MD mechanism controller (IC501) and
I/O
SONY bus interface (IC504)
I Serial data input from the RSC-164 (IC901)
O
Serial data output to the RSC-164 (IC901)
O
Serial data transfer clock signal output to the RSC-164 (IC901)
O
Chip enable signal output to the RSC-164 (IC901) "H" active
I Sircs remote control signal input from the remote control receiver (IC901)
I
PLL serial data input from the FM/AM PLL (IC4)
O
PLL serial data output to the FM/AM PLL (IC4)
O
PLL serial data transfer clock signal output to the FM/AM PLL (IC4)
O PLL chip enable signal output to the FM/AM PLL (IC4) "H" active
Power on/off control signal output of the illumination LED and liquid crystal display driver
(IC900) "H": power on Depends on initial setting of power select switch (SW500)
O
Power select switch (SW500) on: "H" output at the accessory on
Power select switch (SW500) off: "H" output at the power on
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Dimmer control in/out terminal
i
At initial mode: The presence of dimmer select function is set (if this status, if "L" is input, the
I/O
dimmer select function is present)
At normal mode: LCD back light brightness control signal output
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2 9
8
Function
Q Q
3 6 7 1 3 1 5
co
.
– 85 –
9 4 2 8
"L": reset
0 5 8 2 9 9 4 2 8
m
9 9
9 9