Panasonic KX-F910BX Service Manual page 86

KX-F910BX
No link (Portable handset TX)
4
Is the data waveform input to
pin 14 of CPU during charging?
Does TALK LED(D10) light up
when the TALK switch of the
portable handset is pressed?
Is the data of the portable
handset output from CPU(IC6)?
Check R159.
Check RF part.
No link (Portable handset RX)
5
Is signal output to pin 3 of IC1
collector when the data signal
is sent from the base unit?
Is signal input to pin 21
of IC6?
Does pin 19 of CPU become
LOW when a signal is input?
Check around CPU(IC6).
NO
Check around Q2.
YES
Check around
NO
battery, IC6 and
IC4.
YES
NO
YES
Check around
pins 38~41 of CPU(IC6).
Check RF part, IC1
NO
and Q15.
: resolding
YES
NO
Check around IC6.
YES
NO
Check around
NOISE AMP(IC1).
YES
NO
Is pin 19 of CPU
(IC6) "HIGH"?
YES
| 90 |
Check around
NOISE AMP(IC1).