FIC a440 Servicehandbuch
Troubleshooting and Repair
6-20
FIC A440 Series Service Manual
6.4.12 External Keyboard Check
12
Check Keyboard
Data
Check U26 Pin 7
( EXT1DATA )
Check Keyboard
Clock
Check U26 Pin 4
( EXT1CLK )
Check IRQ signal
Check U26 Pin23
( IRQ1)
END
NO
YES
NO
NO
YES
YES
Figure 6-11
Internal Keyboard Check
6.4.13 PS/2 Mouse Interface Check
13
Check Mouse Data
Check U26 Pin 8
( EXT2DATA )
Check Mouse Clock
Check U26 Pin 5
( EXT2CLK )
Check IRQ signal
Check U26 Pin22
( IRQ12)
END
NO
YES
NO
NO
YES
YES
Figure 6-12
Internal Keyboard Check