Canon LV-7105 Service Manual - Page 87

Control Port Functions

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Part 4: Troubleshooting 2. CONTROL PORT FUNCTIONS 2.1 System Control & I/O Port Functions IC Ref. No Pin/Name I/O IC301 PortA0 I/O PortA1 I/O PortA2 I/O PortA3 I/O PortA4 I/O PortA5 I/O PortA6 I/O PortA7 I/O PortB0 I/O PortB1 I/O PortB2 I/O PortB3 I/O PortB4 I/O PortB5 I/O PortB6 I/O PortB7 I/O IC1803 12 O 13 O 14 O 15 O 16 O 17 O 18 O 19 O IC1804 12 O 13 O 14 O 15 O 16 O 17 O 18 O 19 O Signal Name Function Note ROMWEL For ICE ROMWEH For ICE BOOTWE For ICE Not used Fixed High 5V_SW Power ON/OFF MainPower-ON: High LAMP_BST_SW Lamp Ballast ON/OFF Lamp Ballast-ON: High IO_Reset Initialize I/O I/O Active: Low LAMP_POW Lamp-ON Lamp-ON: High 3L_EN 3-Line Serial ON/OFF Serial Line-ON: Low PortB1 MatrixSDA Mouse1 Mouse Control Air Mouse-ON: High Not used Fixed High SCL_IN Fixed High Not used Fixed High M_SCL IIC CLK M_SDA IIC DATA Mute Mute Mute-OFF: High LAMP_REP_LED Lamp Replace LED Drive ON: High READY_LED Ready LED Drive ON: High TEMP_LED Temp Warning LED Drive ON: High POW_LED Power LED Drive ON: High KO3 Main Key Switch KO2 Main Key Switch KO1 Main Key Switch CG_Filter CG Filter ON/OFF ON: High VHDREN Philips chip Enable ON: High VFIELD_SW VField PC/AV Selection Video V Field: High Y/G_SW Sync Sep. Y/G Selection Y: High G: Low PC/AV _SW PC/AV Selection PC: High AV: Low C/V_SW Video/Component Video: Low Selection Component: High PeriPow_SW Power consumption Normal: High SW in ST Standby: Low FanDrive_SW Fan Drive ON/OFF Fan Drive ON: High OFF: Low 4-9

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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
4-9