KX-AT7730RU - Panasonic Telephone Service Manual (repair manual). Page 20

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20
KX-AT7730 Series
7.4.
TONE DIAL TORUBLE
7.5.
THE ELECTRONIC VOLUME OF THE SPEAKER-PHONE DOES NOT 
WORK
7.6.
THE ELECTRONIC VOLUME OF HANDSET DOES NOT WORK
Does a DTMF tone sound?
Yes
No
Yes
Check Pin60 and Pin61 of IC1,
R123, R124.
Yes
Does the DTMF tone mix 
two-frequencies?
Does a DTMF signal appear 
at Pin9 of IC5?
Yes
Does a DTMF signal appear 
at Pin49 and Pin50 of IC1?
Check Q3 and R81, C81.
No
No
No
Check IC5, R82.
Check IC1.
Press the speaker-phone button and create a
dial tone.
No
Check Q15, Q16 and R67-R70 
and pin56-59 of IC1.
Yes
Does the volume change with the press of 
Navigation key?
OK
Lift the handset and create a dial tone.
No
Yes
Does the volume change with the press of 
Navigation key?
OK
Check Q11, R37 and pin56, 57 of IC1.
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