Panasonic KX-F900 Service Manual page 91

KX.F900-- 1
6_ No link (Base unit RX)
Is the ID data output from N_O -Check Q506 and
CONT terminal during charging? l °l MPU.
i i
IYES
Iv
Is the data signal output to pin 3 iNOI
of RF unit drain during _ Check RF unit.
conversation with the portable
handset?
JYES
/|
Is the data signal output to ]NC) I
pin 4 of IC503?
[I
IYES
/
Does pin 5 of MPU become INO
LOW when a signal is input?
F"
IYES
Check around
IC503.
Check around
NOISE AMP.
..N
O
C
r- ;
m i
t_
O
O
.-I
z
i'- m
m
Check around MPU.
(_No link (Base unit TX)
I .
Does the TALK LED flash I ,,,,-, I
when the page key is
pressed?
IYES
t I
Is there data output of the I NOI
base unit from MPU?
FI
Check pin 44 of MPU.
IYES
Check RF unit.
Check around the
MPU.
Is pin 5 of MPU
HIGH?
IYES
Check around pin
44 of MPU.
Check around
NOISE AMP.
I
-91 -