Panasonic KX-F900 Service Manual page 86

I Kx:F,oo ..... I
(3) No voice reception
Does the modulation
factor become 6.4 kHz
Devi. when -27 dBm is
input to the base unit?
Is there an output
waveform at pin 6 of
CN501 ?
IYES
Is there an output
waveform at pin 10 of
IC502?
_YES
Check RF unit
(cordless base unit).
....................... -_YES
__ Check the Analog board.
._ heck around I
IC502.
Is there an output
waveform at pin 5 of
IC202 (Portable handset)?
_YES
Is there an output
waveform at pin 8 and
5 of IC208?
I YES
Check SPEAKER.
....
it, VR202
d IC202.
___ Check around
IC208.
(4) No voice transmission
Does the microphone of the
portable handset work.
._ Check around the
microphone.
IYES
Dose the modulation factor
become 5.0 kHz Devi.
When -40 dBm is input to
the portable handset
microphone terminal?
INo
Is there an output waveform
I.ol
the co ector of Q208? on]
I I
IYES
Is there an output
pin 10 of IC202? waveform at NO
IYES
Check RF part (portable
handset).
Check around
Q208.
Check around
IC202.
YES
Is there an output
waveform on the
drain of Q511 base
unit?
I YES
| !
Is there an output at NLN_
pin 5 of IC502?
I YES
I
Is there an output at I
pin 5 of CN501?
I
I YES
Check the Analog
borad.
1
_._ heck RF unit,
Q511.
Check around
IC502.
86