Apple PowerBook 140 Specifications download pdf (Page 47)

Troubleshooting Symptom Charts/Peripherals

(Continued)

- 21

Peripherals

(Continued)

Cursor moves, but

clicking trackball

button has no effect

1 Check interconnect board, daughterboard, and motherboard

connections.

2 Replace trackball.

3 Replace keyboard.

4 Replace interconnect board.

5 Replace daughterboard.

6 Replace motherboard.

Cursor does not move

when using mouse

1 Check mouse connection to ADB port.

2 Press reset switch.

3 Clean mouse ball and inside mouse.

4 Replace mouse.

5 Replace motherboard.

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