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37
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KX-F910BX
TROUBLESHOOTING GUIDE
Check solder at the
pin 8 of IC10 and Q8.
Connect the unit to the
loop simulator.
Switch : TX side T-R
: Connect oscilloscope
Modem test start
Is the four signal at
Tip-Ring output?
Connect the PBX and
TEL. line and off-hook.
Check the trace
between pins 44 of
IC11 and Tip-Ring.
Is the signal at pin 45
of IC11 dial tone input?
Replace IC11.
Check the trace
between T1 and pin
45 of IC11.
Is the signal at pins
44 of IC11 output?
Is the voltage at pin 8
of IC10 24 V?
Check the solder at
pins 116 of IC1.
Replace IC11.
OK
3 Unit can copy, but can not transmit/receive
YES
YES
YES
YES
NO
NO
NO
NO
(TEST CODE NO. 554)
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