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3-14. CORDLESS SECTION
(1) Battery won't charge (Cordless Base unit)
Plug in the AC power source.
Is the charge LED lit?
Is the voltage between + and – 12 V?
NO
Check D505,R655,R656.
(2) Battery won't charge (Portable handset)
Check the contact between
the battery pack and the
Portable handset.
Is the voltage at cathode of
Diode D13, D11 about 5.4 V?
Note: When charge after
removing the battery.
Check R71, R72, D3
and the battery.
NO
YES
YES
Check battery
YES
NO
YES
Is the voltage of Q510
NO
collector about
7.0 V?
YES
Is the voltage of
NO
pin 34 of MPU
4.1 V?
YES
Is pin 14 of MPU
4.9 V?
NO
NO
Does the MPU clock
oscillate?
IC501 8pin
YES
Check around LED.
Check D11, D12, D13
and D14.
| 85 |
KX-F910BX
Check the
charge circuit.
(Refer to page 173)
Check around
MPU (IC501).
: resolding
NO
Is pin 9 of
MPU HIGH?
YES
Check Reset
Line.
(MPU IC501 9pin)
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