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TROUBLESHOOTING GUIDE
KX-F680BX/KX-F2681BX
(3) The broken parts repairing details
(D101)
Check short-circuit of terminal 4. If D101 is short-circuited, F101 will be melted (open). So in this case,
replace the 60th parts (D101, F101).
(Q101)
The worst case of Q101 is a short-circuit between the Drain and Gate because damage expands to IC101.
This is due to of very high voltage through the Gate circuit which is composed of D104, R107, R114 and
R121. Then you should change all of the parts listed as follows:
F101, Q101, D104, R107, R114, R121, IC101.
(IC101)
Occasionally, it exists as the sole case of a broken IC101. You should exchange.
(D201)
If D201 is broken, the oscillation circuit of the power supply cannot operate. Check it with an electric tester.
*Intermittent Oscillation:
This happens when the power supply balance is broken and loads as a perfect open or short-circuit of
output. The graph of Intermittent Oscillation is shown as follow.
No Oscillation
Oscillation
Summary of Contents for KX-F680BX
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Page 130: ... 165 KX F680BX KX F2681BX EC1 EC2 EC3 EC4 EC5 EC6 EC7 EC9 EC10 EC11 EC12 EC13 EC8 TOOLS ...
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