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KX-TS2388RUB/KX-TS2388RUW/KX-TS2388CAB/KX-TS2388CAW/KX-TS2388UAB/KX-TS2388UAW
8 Troubleshooting Guide
8.1.
Service Hints
8.2.
Pulse Dialing Problems
Check IC801 (91), R481, R485.
Check IC801, X1.
Dead.
Check Q401, Q402, Q403.
Can't hear the voice from handset.
Check Q422, Q107.
No voice transmit.
Can't tone dial.
Check D3, D4, D5, D6, IC1, Q1
Check Q101, Q103, Q104.
No rings.
Can't pulse dial.
Check Handset jack.
Can't speak with the handset.
Check IC801, R407~R409, IC601, Q406, Q407,
C412~C414, R619~R621.
Can't change the volume for Handset or
Speakerphone.
Check IC801, Q107, Q401.
No volume handset or speakerphone.
SYMPTOM
CURE
Check C551, C552, R551, R552, D551~D554, IC801.
Caller ID Function doesn't work.
Check around IC501, Q501, Q502.
Caller ID Function doesn't work. (DTMF)
Check IC201, Q201.
Can't auto redial.
Check Q110.
Can't hold.
Check IC601.
Can't speak with the speakerphone.
Can a pulse sound
be monitored?
Check TEL line Jack.
Do pulses
(3 Vp-p) appear
at Pin73 of IC801?
Do pulses
(0.6 Vp-p) appear
at base of Q103?
Does the voltage
across Tip (T) and
Ring (R) rapidly
switch between 48V
and 10V ?
YES
NO
Check IC801,
X1.
NO
Check dial mode
in Pulse Dialing?
Change to
Pulse Dial
mode.
NO
Check Q104.
Check Q101 and
Q103.
NO
YES
YES
YES
YES
NO
