Panasonic KX-FL423RU Service Manual ▷ View online
109
KX-FL423RU-B / KX-FL423RU-W
12.2.5.2. Defective ITS (Integrated Telephone System) SECTION
1. No handset and speakerphone transmission / reception
Perform a signal test in the ITS or the NCU section and locate a defective point (where the signal disappears) on each route
between the handset microphone and telephone line (sending), or between the telephone line and the handset speaker
(receiving), or between the microphone and the telephone line (sending), or between the telephone line and the speaker
(receiving). Check the components at that point. Check sheet for analog signal route(P.108) is useful for this investigation.
between the handset microphone and telephone line (sending), or between the telephone line and the handset speaker
(receiving), or between the microphone and the telephone line (sending), or between the telephone line and the speaker
(receiving). Check the components at that point. Check sheet for analog signal route(P.108) is useful for this investigation.
2. No pulse dialing
3. No ring tone (or No bell)
CROSS REFERENCE:
Check sheet for analog signal route (P.108)
NCU Section (P.30)
110
KX-FL423RU-B / KX-FL423RU-W
4. No tone dialing
CROSS REFERENCE:
Check sheet for analog signal route (P.108)
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KX-FL423RU-B / KX-FL423RU-W
12.2.5.3. Operation Panel Section
Refer to Test Functions (P.75).
1. NO KEY OPERATION
2. NO LCD INDICATION
CROSS REFERENCE:
Test Functions (P.75)
112
KX-FL423RU-B / KX-FL423RU-W
12.2.5.4. Sensor Section
Refer to SENSORS AND SWITCHES for the circuit description.
Perform an SENSOR CHECK to determine if the sensor is operating correctly.
1. Check the .......... “CHECK DOCUMENT”
Perform an SENSOR CHECK to determine if the sensor is operating correctly.
1. Check the .......... “CHECK DOCUMENT”
2. Check the paper feed sensor.......... “REMOVE DOCUMENT”
3. Check the hook switch
4. Check the cover open switch.......... “COVER OPEN”
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