Sony XR-C7350X, Руководство по обслуживанию

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XR-C7350X
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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
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
27 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
When the microprocessor is in the operating mode, detects changes in the back-up by
detecting the rising edge, falling edge, and both edges of the interrupt request flag
When the microprocessor is in the HALT mode, it can be cleared from this mode using
this interrupt
Remote control input
Use the interrupt input port
30, 31 NCO O
32 MTLIN O
Reset input terminal
Reset at “L” level
TUNER power supply control output terminal
Active during tuner ON (includes sub- reception, ATA mode on)
Buzzer control output
Terminal for driving piezoelectric buzzer to produce beep sound
System power supply control output
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
Illumination color switching terminal model acknowledge terminal
Sets the slave illumination to amber when “H” Green when “L”
Accessory power supply detection input
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
from OFF to ON, the test mode is set
TELEPHONE MUTE detection input
40 TELATT I Performs audio 20dB attenuation in the input on state
Set to the input on state at “H”
Serial clock input
UNI-LINK serial interface clock input terminal
Serial data output
UNI-LINK serial interface data output terminal
Serial data input
UNI-LINK serial interface data input terminal
Pin No.
Pin Name I/O Function
Not used
26 KEYACK I
28 BUIN I
29 SIRCS I
33 RESET O
34 TUNON O
35 BEEP O
36 PW_ON O
37 COLSEL I
38 ACCIN I
39 TESTIN I
43 UNISI I
41 UNICLI I
42 UNISO O
Pin No. Pin Name
I/O Function
7-10. IC PIN FUNCTION
• IC501 MASTER MICRO COMPUTER (MN101C49KTA1) (MAIN Board)
2 VSM I
3 FMAGC I
7 RCIN0 I
18 NOSESW I
19 BUSON O
20 SYSRST O
21 LCDSO O
22 LCDCE O
23 LCDCKO O
25 RAMBU I
1 VREF — Reference voltage (– side) of AD conversion
FM/AM common signal meter A/D conversion input terminal
AM (MW:SW:LW), FM S meter voltage detection terminal
FM AGC A/D conversion input terminal
FM AGC voltage detection terminal
4 KEYIN1 I KEY input
5 KEYIN0 I Use the AD conversion input
6 DSTSEL I Terminal for selecting and setting destination value Reads during reset
Rotary commander input
Use the AD conversion input
8, 9 QUALITY O Not used
10 VREF — Reference voltage (+ side) of AD conversion
11 VDD — Power supply terminal
12 OSCOUT O Terminal connected to the oscillator
13 OSCIN I Connected to the 18.432 MHz oscillator
14 VSS — Ground terminal
15 XIN I Terminal connected to the sub-clock (for clock) oscillator
16 XOUT O Connected to the 32.768 kHz oscillator
17 MMOD — Ground terminal
Front panel disconnection/attachment detection input terminal
A panel is present when “L”
BUS ON control output
Outputs “L” when UNI-LINK communication is activated
SYSTEM RESET control output
Outputs “L” when the UNI-LINK slave microprocessor is reset
LCD serial data output
Serial interface with LCD driver IC
Outputs “L” when OFF to prevent misoperations of the C-MOS port
LCD chip enable output terminal
Serial interface with LCD driver IC
Outputs “L” when OFF to prevent misoperations of the C-MOS port
LCD serial clock output
Serial interface with LCD driver IC
Outputs “L” when OFF to prevent misoperations of the C-MOS port
24 RCIN1 I Rotary Commander Shift input terminal
RAM reset detection input
After clearing input reset to check if the RAM data has been damaged by decreasing
voltage, checks the RAM data within 50 ms Results
“L” = Clears the RAM as the power supply voltage of the microprocessor dropped
below the minimum data maintenance voltage
“H” = Checks the RAM damage check area as the power supply voltage of the
microproces sor has not dropped below the minimum data maintenance voltage
Clears the RAM if the RAM damage check area is damaged
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