Sanyo CLT-99 Service Manual page 14

TROUBLE SHOOTING
d. 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 (32) IC001 "High"?
YES
NO
2. Is the carrier signal being Is there voltage in
output to the antenna? terminal (C) of Q001?
YES
Is there voltage in terminal (C) of Q254?
YES
Check Q251, Q252, Q253
3. Is a modulation signal (49MHz)
being output to the antenna?
YES
4. Is Rx data being input to pin (37) of IC001?
YES
Check IC001. Is Rx data being output to pin (15) of IC351?
YES
Check IC001.
e. Transmission signal.
Handset
1. Does the transmission signal reach pin (41) of IC351?
YES
2. Does the transmission signal reach pin (47) of IC351?
YES
Base Station
3. Does the transmission signal reach pin (25) of IC301?
YES
4. Does the transmission signal reach pin (18) of IC301?
YES
5. Does the transmission signal reach telephone line side
of T901?
YES
Check T901, Q702, Q701, IC701 and Q709.
CLT-99/SS (S/M) 6 14
NO
Check charger terminals, D099 and D098.
NO
Is the level of pin (27) of IC001 "Low"?
YES
YES
Check Q001.
NO
Check Q254 and D251.
NO
Is Tx data being output to
pin (26) of IC001.
YES
Check D251.
NO
Is there voltage in terminal (C) of Q002.
YES NO
Is the level of pin (25)
of IC001 "Low"?
NO
YES
Check Q151 and IC351.
Check Q002.
NO
Check MIC.
NO
Check IC351.
NO
Check IC301.
NO
Check IC301.
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TROUBLE SHOOTING
f. No voice signal is emitted during voice communications of handset ear speaker. (TALK MODE)
Base Station
1. Is there voltage in the T901 telephone line?
NO
YES
Check IC001.
2. Does the voice signal reach secondary of T901?
YES
NO
Check IC001.
3. Does the voice signal reach pin (45) of IC301?
YES
4. Does the voice signal reach pin (50) of IC301?
YES
Handset
NO
Check IC001.
g. The number cannot be dialed.
g-1. PULSE MODE
1. Is the High/Low signal being emitted to pin (48) of IC401?
YES
2. Is Q903 switching?
YES
Check Relay, RY901.
g-2. TONE MODE
1. Does the TONE signal reach pin (14) of IC705?
2. Does the TONE signal reach pin (B) of Q702?
3. Does the TONE signal reach secondary of T901?
4. Does the TONE signal reach Telephone Line?
12/1/00, 3:18 PM
NO
Is the switch (RY901)
"ON"?
YES
Is the level of pin (48) of
IC401 "Low"?
NO
YES
Check T901. Is the level of collector
Q903 "High"?
YES
NO
Check Relay.
Check IC701.
NO
Check IC301.
NO
Check IC401.
NO
Check Q903.
NO
Check IC705 and IC401.
YES
NO
Check D705 and D706.
YES
NO
Check Q702 and Q701.
YES
NO
Check T901, L901, L902 and NL901.
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NO
Check L901, L902,
CN901 and NL901.
NO
Check IC401.
NO
Check Q903.