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3 Unit can copy, but can not transmit/receive
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
(TEST CODE NO. 554)
Is the four signal at
Tip-Ring output?
NO
Is the signal at pins
44 of IC11 output?
NO
NO
Is the voltage at pin 8
of IC10 24 V?
YES
Check the solder at
pins 116 of IC1.
OK
Replace IC11.
Connect the PBX and
TEL. line and off-hook.
YES
Check the trace
between pins 44 of
IC11 and Tip-Ring.
YES
Check the trace
between T1 and pin
45 of IC11.
| 37 |
KX-F910BX
NO
Is the signal at pin 45
of IC11 dial tone input?
YES
Replace IC11.
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