Canon D78-5132, Service Manual

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2. CONTROL PORT FUNCTIONS
2.1 System Control & I/O Port Functions
IC Ref. No Pin/Name I/O Signal Name Function Note
IC301 PortA0 I/O ROMWEL For ICE
PortA1 I/O ROMWEH For ICE
PortA2 I/O BOOTWE For ICE
PortA3 I/O Not used Fixed High
PortA4 I/O 5V_SW Power ON/OFF MainPower-ON: High
PortA5 I/O LAMP_BST_SW Lamp Ballast ON/OFF Lamp Ballast-ON: High
PortA6 I/O IO_Reset Initialize I/O I/O Active: Low
PortA7 I/O LAMP_POW Lamp-ON Lamp-ON: High
PortB0 I/O 3L_EN 3-Line Serial ON/OFF Serial Line-ON: Low
PortB1 I/O PortB1 MatrixSDA
PortB2 I/O Mouse1 Mouse Control Air Mouse-ON: High
PortB3 I/O Not used Fixed High
PortB4 I/O SCL_IN Fixed High
PortB5 I/O Not used Fixed High
PortB6 I/O M_SCL IIC CLK
PortB7 I/O M_SDA IIC DATA
IC1803 12 O Mute Mute Mute-OFF: High
13 O LAMP_REP_LED Lamp Replace LED Drive ON: High
14 O READY_LED Ready LED Drive ON: High
15 O TEMP_LED Temp Warning LED Drive ON: High
16 O POW_LED Power LED Drive ON: High
17 O KO3 Main Key Switch
18 O KO2 Main Key Switch
19 O KO1 Main Key Switch
IC1804 12 O CG_Filter CG Filter ON/OFF ON: High
13 O VHDREN Philips chip Enable ON: High
14 O VFIELD_SW VField PC/AV Selection Video V Field: High
15 O Y/G_SW Sync Sep. Y/G Selection Y: High G: Low
16 O PC/AV _SW PC/AV Selection PC: High AV: Low
17 O C/V_SW Video/Component Video: Low
Selection Component: High
18 O PeriPow_SW Power consumption Normal: High
SW in ST Standby: Low
19 O FanDrive_SW Fan Drive ON/OFF Fan Drive ON: High
OFF: Low
Part 4: Troubleshooting
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