Read Panasonic KX-AT7730RU Service Manual online
19
KX-AT7730 Series
7.3.
SPEAKER-PHONE TROUBLE
Press the speaker-phone button
and create a dial tone.
and create a dial tone.
No
No
Yes
Yes
OK
Yes
Yes
Does the dial tone sound from
the speaker-phone?
the speaker-phone?
Input signal from the MIC.
Does the dial tone reach at Pin27
of IC3?
of IC3?
Does the dial tone reach
at Pin19 of IC3.
at Pin19 of IC3.
Yes
Check C63 speaker.
Check R57, C61, C62, IC3.
Yes
No
No
Does the dial tone reach at
collector of Q4?
collector of Q4?
Check C42, C46, R42 and Q13.
No
Is it possible to send a signal
from the MIC?
from the MIC?
Does a signal reach at
Pin4 of IC3?
Pin4 of IC3?
Check C41, R41 and Q3.
Check IC3, C64, R206, C59,
R45, C48 and Q14, MIC.
R45, C48 and Q14, MIC.
Check Q3.
Does a dial tone sound
from the Handset speaker.
from the Handset speaker.
Yes
Change the Volume of sp-phone.
Is mark indicated more than
three on the LCD?
Is mark indicated more than
three on the LCD?
Check Q12, CN7, CN8, JK3.
No
No
No
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