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8 Troubleshooting Guide
8.1.
Service Hints
Dead.
Can't hear the voice from handset.
No voice transmit.
Can't tone dial.
Can't pulse dial.
No rings.
Can't speak with the handset.
Can't change the volume for Handset or
Speakerphone.
No volume handset or speakerphone.
Caller ID Function doesn't work.
Caller ID Function doesn't work. (DTMF)
Can't auto redial.
Can't hold.
Can't speak with the speakerphone.
8.2.
Pulse Dialing Problems
Can a pulse sound
be monitored?
Does the voltage
across Tip (T) and
Ring (R) rapidly
switch between 48V
and 10V ?
Check TEL line Jack.
SYMPTOM
NO
YES
NO
YES
CURE
Check IC801, X1.
Check Q401, Q402, Q403.
Check Q422, Q107.
Check IC801 (91), R481, R483, R485.
Check Q101, Q103, Q104.
Check IC1, Q1
Check Handset jack.
Check IC801, R407~R409, IC601, Q406, Q407,
C412~C414, R619~R621.
Check IC801, Q107, Q401.
Check C551, C552, R551, R552, D551~D554, IC801.
Check around IC501, Q501, Q502.
Check IC201, Q201.
Check Q110.
Check IC601.
NO
Check dial mode
in Pulse Dialing?
YES
Do pulses
NO
(3 Vp-p) appear
at Pin73 of IC801?
YES
Do pulses
NO
(0.6 Vp-p) appear
at base of Q103?
YES
Check Q101 and
Q103.
13
KX-TS880MXB/KX-TS880MXW
Change to
Pulse Dial
mode.
Check IC801,
X1.
Check Q104.
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