Sony LLC-8000A Service Manual page 8

2-1. Self-Diagnosis of the CPU-240 Board
2-1-2. Self-diagnosis of the CPU-240 Board
Remove the CPU-240 board with the main power off. Exchange IC43 with the self-diagnosis ROM.
Connect the checker tool. Set the switch S1 to the DIAG position. Then turn on the main power.
The self-diagnosis software of the CPU-240 board starts up.
n
Self-diagnosis ROM (Servicing use only)
IC M27C512-C8000AV110 : 8-759-588-82
Checker
Fabricate the checker tool as shown below for troubleshooting and field-servicing the CPU-240 board.
CN1
O 1
O 2
O 3
O 4
O 5
O 6
O 7
O 8
O
9
O 10
O 11
O 12
O 13
O 14
AS3
O 15
AS2
O 16
AS0
O 17
AS1
O 18
DS0
O 19
O 20
AS5
O 21
PCSEL1
O 22
AS6
O 23
AS7
O 24
AS4
O 25
O 26
T2
O 27
TXB2
TXB1
O 28
T1
O 29
O 30
RXB2
RXB1
O 31
T4
O 32
T0
O 33
T3
O 34
O 35
O 36
O 37
O 38
O 39
O 40
+5V
10K
b8
KD3
10K
b7
KD2
10K
b6
KD1
10K
b5
KD0
b4
T4
b3
T3
b2
T2
b1
T1
b0
T0
2-2
CN2 CN3
O 1 O 1
O 2 O 2
O 3 O 3
O 4 O 4
O 5 O 5
O 6 O 6
O 7 O 7
O 8 O 8
O O
9 9
O 10 O 10
O 11 O 11
O 12 O 12
O 13 O 13
O 14 O 14
O 15 O 15
O 16 O 16
O 17 O 17
O 18 O 18
O 19 O 19
O 20 O 20
O 21 O 21
O 22 O 22
O 23 O 23
O 24 O 24
O 25 O 25
O 26 O 26
O 27 O 27
TXB3 TXB4
O 28 O 28
O 29 O 29
O 30 O 30
RXB3 RXB4
O 31 O 31
O 32 O 32
O 33 O 33
O 34 O 34
O 35 O 35
O 36 O 36
O 37 O 37
O 38 O 38
O 39 O 39
O 40 O 40
PCSEL1
DS0
AS7
AS6
AS5
AS4
AS3
AS2
AS1
AS0
CN4 CN6
O 13
O 1
O 25
O 2
O 12
O 3
O 24
O 4
O 11
O 5
O 23
O 6
O 10
O 7
O 22
O 8
O 9
O
9
O 21
O 10
O 8
O 11
O 20
O 12
O 7
O 13
O 19
O 14
O 6
O 15
O 18
O 16
KD3
O 5
O 17
KD2
O 17
O 18
KD1
O 4
O 19
KD0
O 16
O 20
O 3
O 21
O 15
O 22
O 2
O 23
O 14
O 24
O 1
O 25
O 26
O 27
O 28
O 29
CN5
O 30
O 31
1
O 32
2
O 33
3
O 34
4
O 35
5
O 36
6
O 37
7
O 38
O 39 8
O 40
9
10
11
12
13
14
+6V
b9
b8
CN7
+5V
b7
+5V
GND
b6
A+5V
GND
b5
+12V
AGND
b4
_12V
+6V
b3
_6V
b2
+15V
b1
b0
+5V
TXB5
14 13 12 11 10 9 8
T5
V
DD
RXB5
GND
1 2 3 4 5 6 7
74HC00
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LLC-8000A