Nokia 7600 - Keypad Fault

NMM-3 Company Confidential
6-Troubleshooting CCS Technical Documentation
Page 6-8 Copyright  2003 Nokia Corporation Issue 1 (11/2003)
Company Confidential
Keypad Fault
Start
Measure Voltage on
S400 when pressed.
Is it high?
Check
S400 is
OK?
Check R432, R40
and R439 and
line, if OK,
re
p
lace UEME.
Replace S400
No
Is the volume
up key
working?
Is the power key
working?
No
Measure voltage
on S400 is it
hi
g
h?
Y
es
No
Y
es
Phone is
dead
Phone is
dead
Y
es
No
Is the volume
down key
working?
Y
es
Measure COL1 from
S402, when pressed, is
there a 50
µ
s
p
ulse?
Check S402, R400
and R438, if it still
fails replace TIKU
D300.
Replace TIKU
D300
Y
es
No
Measure ROW5
line from S402.
Is it ~1.8V?
Y
es
No
Check S402, R400
and R436, if it still
fails replace TIKU
D300.
No
Measure COL0 from
S402, when pressed, is
there a 50
µ
s
p
ulse?
Check S403, R400
and R438, if it still
fails replace TIKU
D300.
Replace TIKU
D300
Y
es
No
Measure ROW5
line from S403.
Is it ~1.8V?
Y
es
No
Check S403, R400
and R437, if it still
fails replace TIKU
D300.
No
Y
es
Continue
Y
es