Panasonic KX-F900 Service Manual page 90

i 1 ....
(_) (No link (Portable handset TX)
IS the data wave,orm input to N Ol_ch-el i aio i-ndQ-20 _-
pin 14 of CPU during charging_i v
IYES
Does LED _ight up when the
TALK switch of the portable
handset is pressed.
IYES
Is the data of the portable
handset output from CPU?
Check R250.
_IYES
Check RF part. J
_ heck around
battery, IC206 and
IC201.
Is pin 49 of CPU NOLNLNLN_ Check around 1
H, H? i i I
_YES
Check around I
pins 51-54 of CPU. I
(_) No link (Portable handset RX)
Is signal output to Q214
collector when the data signal
is sent from the base unit?
IYES
Is signal output to pin 50
of IC201?
IYES
Does pin 49 of CPU become
LOW when a signal is input?
IYES
.{ heck RF part, Q214
and Q215.
_ Check around IC201 'l
Check around
NOISE AMP.
Check around CPU.
90-