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TROUBLE
SHOOTING
L
a.
1.
2.
3.
4.
5.
6.
7.
b.
1.
2.
3.
c.
1.
2.
3.
4.
5.
The base station
does not operate.
Is the AC adaptor connected to an AC 230V line ?
Is the jack (DC 9V) connected to the base station ?
Is the voltage of C of Q901 9V or higher
?
NO
Is the voltage of AC adaptor output 9V ?
Check AC adaptor.
1 YES
v
Is the voltage of E of Q901 6.OV ?
Check Q908.
1 YES
v
NO
Is the voltage of pin (11) of IC401 5.3V ?
Check D401.
1
YES
1
Is the level of pin (12) of IC401 "High" ?
Check IC402.
1 YES
v
Is the frequency of pin (1O) of IC401 "4.0932 MHz"?
Check the OSC, circuit include X401.
t
YES
Is the level of pin (14) of IC401 "High
?
Check D907, Q902 and Q401.
I
The handset
does not operate.
Is the voltage of pin (39) of ICOO1 3.3V or higher ?
Is the level of the reset terminal of pin (20) of ICOOI
'(High"
7
+
YES
Is the frequency of pin (22) of ICOOI "4.15 MHz" ?
Check XO02 and ICOO1.
The security
code cannot
be registered.
(Base station)
(Voice communication
are not possible
by pushing
by the TALK button.
The unit dose not link.)
Is the level of pin (29) of IC401 '(High" ?
Check charger terminals Q904.
1 YES
t
v
NO
Is the level of collector of
YES
Is a carrier signal being output to the antenna?
Check Q201 and
b
Q204 "High" ?
b
Q202.
YES
J NO
w
I
Is the level of pin (7) or IC401 "Low"?
—__.L_-*+
4-
'0- ?'f~~out:
'chec '
Isa modulation
signal (30MHz) being output to the
1
Check IC301, D202 I
r
Is RX data being input to pin (4) of IC401 ?
YES
NO
Check IC401.
I
t
Is RX data being output to pin (17) of IC301 ?
Check QIOI and IC301.
-20-
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