Panasonic KX-TDA6381X / KX-TDA6381SX Service Manual ▷ View online
29
KX-TDA6381X/KX-TDA6381SX
In case of the Main Board is Defective (Continue)
NO
NO
OK
OK
NG
OK
NG
OK
NG
OK
NG
OK
The line can not be acquired.
Is the CODEC(IC6,IC7) dial port
H
ĺ L while the line is acquiring ?
Replace the
NG parts of CODEC.
Replace the
NG parts of RL3A-H.
Replace the
NG parts of Q4A-H.
Replace the
NG parts of D3A-H.
Replace the
NG parts of L1A-H.
Replace the
NG parts of TH1A-H or J1A-H.
Are RL3A-H ON
while the line is acquiring ?
Check the transistors
Q4A-H.
Check D3A-H.
Check L1A-H.
Check TH1A-H or J1A-H.
END
30
KX-TDA6381X/KX-TDA6381SX
In case of the Main Board is Defective (Continue)
NO
Yes
NG
Cannot make an outgoing call.
(DTMF Dialing Mode)
Can DTMF signal be sent
between T-R?
Confirm DTMF waveform of
Vout pin(51, 53, 60, 62) of Codec.
Replace the faulty parts of
IC6, 7.
OK
NG
Confirm DTMF waveform
of OP_AMP IC1A-H pin1.
OK
Go to the flowchart
"The line cannot be acquired."
NG
The dial tone can be heard
from the station.
Confirm Dial tone waveform
of OP-AMP IC1A-H pin1.
OK
NG
Confirm Dial tone waveform of
Vin pin(49, 55, 58, 64) of Codec.
NO
END
Yes
OK
Replace the relevant Codec
IC6, 7.
NG
Replace the faulty parts of
IC1A-H.
Replace the faulty parts of
IC1A-H.
Check C11A-H (0.1 F).
Replace the faulty parts of
C11A-H.
31
KX-TDA6381X/KX-TDA6381SX
6.2.
In Case of the Sub Board is Defective
OK
OK
NG
NG
Check the test
land between [+5V]
and [GND].
Replace the defective parts.
Check
Connector
CN8-33 Pin.
OK
Resolder the defective parts.
Check the
soldering of IC6,
IC7.
Replace the defective parts.
Check
Connector
CN8-34 Pin.
Check the test
land between [+3.3V]
and [GND].
NG
NG
NG
OK
The card doesn't work.
Check for short of the power supply.
(The power supply should be OFF.)
OK
END
32
KX-TDA6381X/KX-TDA6381SX
In case of the Sub Board is Defective (Continue)
NG
NO
OK
OK
No ring tone.
Check R5I-P, C3I-P.
Replace the
damaged parts.
Check the photo couplers.
The four pins of PC2I-P and
PC1I-P should repeat
L → H → L → H
while the bell is ringing.
Replace the photo
couplers and the
peripheral R or C.
Replace the relevant
CODEC IC6 and IC7.
CODEC IC6 and IC7.
END
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