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TROUBLE
SHOOTING
b.
The security code cannot be registered.
(Handset)
(Voice communications
are not possible by pushing the TALK button. The unit does not link.)
1.
Is the level of pin 40 ICOO1 "High"?
Check charger terminals and D099.
Is TX data being output to
No
L
pin 26, 27 of ICOOI.
Check ICOO1.
+
YES
Check QO03.
Check D251.
2.
Isa modulation
signal (39MHz) being output to the
antenna?
I
L
YES
Is there voltage in terminal
NO
(C) of QO02 ?
Is the level of pin 7 of ICOO1 "Low"?
3.
Is a carrier signal being output
NO
to the antenna?
I
YES
I
~Is there voltage in terminal (C)of Q253?
I Check QO02.
I Check ICOO1.
J
I
I
1
I
T
Is RX data being input to pin 8 of ICOO1?
Is RX data being input pin 9 of IC351?
4.
+
YES
+
YES
i
NO
Check QOO1.
~
Check Q151 and IC351.
e.
1.
2.
3.
4.
5.
Transmission signal.
I Handset
I
*
Does the transmission
signal reach pin 24 of IC652?
Check MIC and D670.
Does the transmission
signal reach pin 1 of IC653?
Check IC653.
~ YES
I
I Base station
I
Does the transmission
signal reach pin 17 of IC301 ?
Check IC301.
Does the transmission
signal reach pin 6 of IC601 ?
Is the level of pin 16 of IC601 "High?
1
'YES
1
&
Check IC602.
Does the transmission
signal reach telephone
line side of
T901 ?
+
YES
I Check T901, Q701, and Q702.
I
-29-
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