Troubleshooting Diagram Of The Keyboard - Nokia 9000i Service Manual

RAE/RAK–1N
Faultfinding/Disassembly
6

Troubleshooting Diagram of the Keyboard

The following picture illustrates the troubleshooting diagram of the
keyboard. Once the keyboard test is started, all the keys of the PDA can
be tested.
keybord test.
2. Press a QWERTY
regognized?
YES
NO All the keys
YES
6.1 Start the Keyboard Test
Start the keyboard test with the service software. The test waits for a
key–press within the given time period.
6.2 Press a QWERTY / Softkey
Press a key on the QWERTY keyboard or one of the soft–keys of the
PDA.
6.3 Key Press Recognized?
If the key was recognized it prints the name of the key on the screen. If a
legal combination of keys are pressed simultaneously, all the pressed
keys are shown on the screen. If the key–press was not recognized then
proceed to 6.3.1 otherwise go to 6.4
Page 8 – 34
0.
Start
1. Start the
/ SoftKey
3.
Key press NO
4.
pressed?
Keyboard test
OK!
Technical Documentation
Check keyboard
3.3.2 YES
CPU fault
if driven and key's
3.1
YES
Sense lines HI?
KEYS (9:0)
NO 3.1.2
CPU fault
3.1.1
R120–R129
YES
OK?
NO
3.1.3
Fix the
correspoding
resistor
After Sales
3.3.1
matrix
NO
3.3
Do senses go lo
pressed?
YES
3.2
Drives toggling?
KEYD(7:0)
NO
3.2.1
R112–R119
OK?
NO
Original, 05/97