Panasonic KX-T2388 Service Manual And Technical Manual page 38

4) DOES NOT ANSWER TELEPHONE CALL
Is there a low level at pin @ of
iC1 when a ring signal is
present?
Check the telephone cord and RING
DETECTOR (IC3, PC1, SA1).
YES
signal?
YES
Check D14, IC1 and
HOOK SW (S101).
5) elICM CONTINUES TO RECORD AFTER CALLER HANGS UP.
6
=
G0On>
eEND OF MESSAGE CLIPPED WHEN CALLER HANGS UP.
When caller hangs up, the KX-T2388 can detect the following 4 signal type.
A. CPC pulse.
B. Dial tone or other continuous tones.
C. Silence.
D. Cyclic signals.
A. Check CPC DETECTOR CIRCUIT (Q4, R14, R20)
B., C., D.
Check VOX DETECTOR CIRCUIT (R47, R48, R51, C26, C27, C28, C29, D18, D19, IC2, IC6)
1C3).
REMOTE CONTROLLER DOES NOT WORK/RESPONSE IS POOR.
The following are considered for the causes of no remote reception:
A. Does the security code of the unit fit in with the input code from the telephone line?
| KX-T2388
B. High distortion in LINE OUTPUT CIRCUIT causing interference between transmitting signal and remote signal.
C. Excessive loss in telephone line.
D. Remote Control Detective Circuit...defective frequency adjustment.
. Check the security code of the unit.
. Check LINE OUTPUT CIRCUIT (Q3, R15, R16 and D10)
. Test on telephone line known to be working properly.
. Adjust VR2 and VR3 (Refer to page 8).