Canon D78-5311, Service Manual

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Part 4: Troubleshooting
4-12
1 R Reset Fixed “H”
2 SCL IIC SCL Active “L”
3 SDA IIC SDA Active “L”
4 AO7 RCLP R Signal clamp reference voltage
5 AO8 GCLP G Signal clamp reference voltage
6 AO9 BCLP B Signal clamp reference voltage
7 AO10 AV/PC AV/PC switch (L: AV H: PC)
8 AO11 SYNC_SW Fixed “H”
9 AO12 G_BLK_DC Video G signal pedestal voltage
10 VrefL D/A converter lower ref. voltage Connected to GND
11 VrefU1 D/A converter upper ref. voltage (CH7~CH12) Vcc (5V)
12 GND GND GND
13 VrefU2 D/A converter upper ref. voltage (CH1~CH6) Vcc (5V)
14 AO1 SCP SW Sandcastle pulse SW Video/S-Video/480i/575i: L else: H
15 AO2 BLANK SW H Blank width SW 1080i/1035i/720p/480p/575p: H else: L
16 AO3 MACRO H: PC, AV (1080i50Hz) L: AV
17 AO4 CBAL_SW Color uniformity correction SW
18 AO5 B_BLK_DC Video B signal pedestal voltage
19 Ao6 R_BLK_DC Video R signal pedestal voltage
20 Vcc Digital power supply Vcc (5V)
21 Vdd Analo gpower supply Vcc (5V)
22 CS2 Chip Select 2 Fixed “L”
23 CS1 Chip Select 1 Fixed “H”
24 CS0 Chip Select 0 Fixed “H”
Pin No. Name Function Action
2.5 IC Bus DA Converter (IC2161) Port Functions
1 R Reset Fixed “H”
2 SCL IIC SCL Active “L”
3 SDA IIC SDA Active “L”
4 AO7 REF_B D/A reference voltage
5 AO8 REF_G D/A reference voltage
6 AO9 REF_R D/A reference voltage
7 AO10 Not used 0V fixed
8 AO11 Not used 0V fixed
9 AO12 Not used 0V fixed
10 VrefL D/A converter lower ref. voltage Connected to GND
11 VrefU1 D/A converter upper ref. voltage (CH7~CH12) Vcc (5V)
12 GND GND GND
13 VrefU2 D/A converter upper ref. voltage (CH1~CH6) Vcc (5V)
14 AO1 B-CENT Video center voltage
15 AO2 G-CENT Video center voltage
16 AO3 R-CENT Video center voltage
17 AO4 DWN Panel control signal
18 AO5 RGT Panel control signal
19 AO6 XRGT Panel control signal
20 Vcc Digital power supply Vcc (5V)
21 Vdd Analog power supply Vcc (5V)
22 CS2 Chip Select 2 Fixed “L”
23 CS1 Chip Select 1 Fixed “L”
24 CS0 Chip Select 0 Fixed “L”
Pin No. Name Function Action
2.6 IC Bus DA Converter (IC1581) Port Functions