Sony XR-4950X Service Manual page 28

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Pin No. Pin Name
26 KEYACK
27
28 BUIN
29 SIRCS
30, 31 NCO
32 MTLIN
33 RESET
TE
L 13942296513
34 TUNON
35 BEEP
36 PW_ON
37 COLSEL
38 ACCIN
39 TESTIN
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40 TELATT
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I/O
Key input acknowledge
Acknowledge signal input terminal to accept the function and eject key from the power
off state
The A/D conversion input power supply is off to save power in the power off state, and
I
key inputs cannot be accepted by A/D
This terminal can therefore determine if function keys have been pressed even in the
power off state When the microprocessor is in the HALT mode, the HALT mode is cleared
using this interrupt
O Not used
BACK-UP detection input terminal
Input terminal to detect power supply back-up Used as interrupt
The circuit is set so that it becomes "H" level when above 8.5+-0.3V
I
When the microprocessor is in the operating mode, detects changes in the backup by
detecting the rising edge, falling edge, and both edges of the interrupt request flag
When the micropro cessor is in the HALT mode, it can be cleared from this mode using
this interrupt
Remote control input
I Use the interrupt input port
When not using this terminal, be sure to fix at "H" or "L"
O
Not used
O
Reset input terminal
O
Reset at "L" level
TUNER power supply control output terminal
O
Active during tuner ON (includes sub- reception, ATA mode on)
Buzzer control output
O
Terminal for driving piezoelectric buzzer to produce beep sound
System power supply control output
O Controls power on/off of the system power supply (turned on when the unit operates)
Outputs "H" when the power is on, and "L" when off
Xplod model acknowledge terminal
I
Sets the slave illumination to amber when "H" Amber when "L"
Accessory power supply detection input
I
Input terminal to detect accessory Accessory is present when "L" is input
Test mode setting input terminal
Input terminal for setting the unit into the test mode
When this port becomes L during microprocessor reset or while the backup changes
fromOFF to ON, the test mode is set Once test mode 1 is set, the TEST input is not
detected in the following backup OFF/ON and test mode 1 is continued Press the OFF
I
button or RESET to clear To set the test mode while the backup power changes from
OFF to ON, if the power is ON, set test mode 1 and turn the power OFF
If the above fails, do not check the TEST input while the backup power changes from
OFF to ON Check only during POWER OFF
TELEPHONE MUTE detection input
I Performs audio 20dB attenuation in the input on state
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Set to the input on state at "H"
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2 9
8
Function
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3 6 7 1 3 1 5
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9 4 2 8
0 5 8 2 9 9 4 2 8
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9 9
9 9