10-21
Chart 19. Keypad Error
PJ6 PJ1 PJ0
PL7
PL6
PL5
PL4
PL3
PL2
1
2ABC 3DEF
4GHI 5JKL 6MNO
7PRS
8TUV
9XYZ
*
0
#
HOME
R0W1
R0W2
ROW3
ROW4
ROW5
ROW6
COL1 COL2 COL3
U702
Verify keypad
model with RSS.
If model checks
good replace
U702.
Synopsis
This chart relates to a failure
in reading the keypad. Basic
Failure modes are as follows:
1) Failure in flex circuit.
2) Bad connection.
3) Defective keypad.
4) Defective port in SLIC.
Keypad
Error.
Verify operation of
keypad per "Button
Check" flow chart C.18.
Signals
check good
at U702?
No
MAEPF-26033-O
By studying the
adjacent chart against
the keys which have
errors, one signal may
be determined to be in
error or verify logic
levels at U702
PJ0,PJ1,PJ6, and
PL2-PL7 for each
channel noting that the
key pressed provides a
logic low on COLx
and on ROWx.
Yes
Replace keypad module if
P107 checks good, or replace
keypad clip if suspect.
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