Nokia NHM–7 Series Troubleshooting Instructions page 22

NHM–7
Troubleshooting Instructions
Keypad
faults 2
Is UI module keys working ?
Yes
Keypad
faults 3
Page 22
Try change UI module.
Is it working now ?
No
No
Check X303
Measure ROW0,
ROW1, ROW2, ROW3,
ROW4 lines from X303.
Are they ~1.8V ?
Yes
Measure SLEEPX
signal from J403
when key is pressed.
Is it ~1.8V?
Yes
When keypad
is pressed, the led's are
turned on ?
Yes
E Nokia Corporation
PAMS Technical Documentation
Yes
Retest
Check ROW0 –
No
4 Lines, X303.
If OK change
Z301. If still fail
change UPP
Check ROW0 –
4 Lines, X303.
No
If OK change
Z301. If still fail
change UPP
Check ROW0 –
4 Lines, X303.
No
If OK change
Z301. If still fail
change UPP
Display
faults
Issue 1 10/2001