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Part 4: Troubleshooting
2.3 IIC Bus D/A Converter ( IC7961, M62393FP) Port Functions
Pin No.
Name
1
R
2
SCL
3
SDA
4
AO5
5
AO6
6
AO7
7
AO8
8
VrefL
9
VrefU1
10
GND
11
VrefU2
12
AO1
13
AO2
14
AO3
15
AO4
16
Vcc
17
Vdd
18
CS2
19
CS1
20
CS0
2.4 Output Expander (IC1801, TC74LCX574FT) Port Functions
Pin No.
Name
1
OE
2
D0
3
D1
4
D2
5
D3
6
D4
7
D5
8
D6
9
D7
10
GND
11
CK
12
Q7
13
Q6
14
Q5
15
Q4
16
Q3
17
Q2
18
Q1
19
Q0
20
Vdd
2.5 Output Expander (IC1802, TC74LCX574FT) Port Functions
Pin No.
Name
1
OE
2
D8
3
D9
4
D10
5
D11
6
D12
7
D13
8
D14
9
D15
10
GND
11
CK
12
Q7
13
Q6
14
Q5
15
Q4
16
Q3
17
Q2
18
Q1
19
Q0
20
Vdd
Function
Action
Reset
Fixed "H"
IIC SCL
Active "L"
IIC SDA
Active "L"
FAN_CON_A
FAN_CON_B
FAN_CON_C
Not used
D/A converter lower ref. voltage
D/A converter upper ref. voltage (CH5~CH8)
GND
GND
D/A converter upper ref. voltage (CH1~CH4)
Not used
Not used
Not used
Not used
5 V
Vcc(5V)
5 V
Vdd(5V)
Chip Select 2
Fixed "L"
Chip Select 1
Fixed "L"
Chip Select 0
Fixed "L"
Function Name
Function
IO_ENB
D0
D1
D2
D3
D4
D5
D6
D7
GND
ADD1_CS
Output Port Chip Select
SC_SW
SCART and PC2 input switch
READY_LED
Ready LED
LAMP_LED
Lamp Replace LED
TEMP_LED
Warning Temperature LED
PWR_LED
AC Power LED
KO3
KEY Scan Output
KO2
KEY Scan Output
KO1
KEY Scan Output
Power Supply +3.3V
Function Name
Function
IO_ENB
D8
D9
D10
D11
D12
D13
D14
D15
GND
ADD1_CS
Output Port Chip Select
--
TURBO_ST
Strobe for Turbo (IC9401)
SH_B_ST
Strobe for B sample & hold (IC501)
SH_G_ST
Strobe for G sample & hold (IC531)
SH_R_ST
Strobe for R sample & hold (IC561)
IRM_RS
Reset for IC401
MCLK_SW
Switch for MCLK
--
Power Supply +3.3V
4-12
I/O
I
I
I/O
O
O
O
O
Connected to GND
-
Connected to Vcc
-
-
Connected to Vcc
-
O
O
O
O
-
-
I
I
I
Polarity
I/O
I
I
I
I
I
I
I
I
I
-
Enable = L
I
SCART, PC2 = H
O
Ready = H
O
Replace = H
O
Warning = H
O
ON = H
O
O
O
O
-
Polarity
I/O
I
I
I
I
I
I
I
I
I
-
Enable = L
I
O
O
O
O
O
O
O
O
-
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