After Sales
Technical Documentation
RAE/RAK–1N
Faultfinding/Disassembly
Page 8 – 34
Original, 05/97
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.
1. Start the
keybord test.
0.
Start
NO
3.3
YES
Do senses go lo
pressed?
YES
3.
3.1
3.2
Key press NO Sense lines HI?
YES
Drives toggling?
regognized? KEYS (9:0)
KEYD(7:0)
YES NO
NO
4.
3.1.1
3.2.1
NO All the keys
R112–R119 R120–R129
pressed?
OK?
YES
OK?
YES NO NO
Keyboard test
OK!
2. Press a QWERTY
/ SoftKey
3.3.2
CPU fault
3.3.1
Check keyboard
matrix
3.1.2
CPU fault
3.1.3
Fix the
correspoding
resistor
if driven and key’s
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
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