Read Panasonic KX-TS85GB / KX-TS85GW Service Manual online
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KX-TS85GB/KX-TS85GW
3. PROBLEMS WITH THE HANDSET
4. TONE DIALING PROBLEMS
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
Connect to the
Telephone line and
lift the Handset.
Telephone line and
lift the Handset.
Can a dial tone be
heard from the
handset?
heard from the
handset?
Can signals be
transmitted from
the handset?
transmitted from
the handset?
Is there a dial tone
at pin 15 of IC1?
at pin 15 of IC1?
Is there a dial
tone at pin 21
of IC1?
tone at pin 21
of IC1?
Check the handset,
handset cord,
C28 and R32.
handset cord,
C28 and R32.
Does a signal
appear at pin 12 of
IC1?
appear at pin 12 of
IC1?
Does a signal
appear at pin
8, 10?
appear at pin
8, 10?
Check Q3, D4, Q4,
Q6, R18 and ZNR2.
Q6, R18 and ZNR2.
Check, Handset MIC
and Handset cord.
and Handset cord.
Check IC1.
Check IC1.
Check Q3, D4
Q4, C22 and
ZNR2.
Q4, C22 and
ZNR2.
OK
Check IC1.
Check D4 and
ZNR2.
ZNR2.
Check IC1 and key
matrix and connection
FFC cable.
matrix and connection
FFC cable.
YES
YES
YES
YES
NO
NO
NO
NO
Check "DIALING MODE"
Program is TONE.
Can the DTMF sound
be monitored?
Program is TONE.
Can the DTMF sound
be monitored?
Does a DTMF signal
appear at Pin 12 of
IC1?
appear at Pin 12 of
IC1?
Does a DTMF signal
appear at emitter of
Q4?
appear at emitter of
Q4?
Check Q3, Q4, R18.
Are the DTMF signals
composed of 2
frequencies?
composed of 2
frequencies?
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