Panasonic KX-FPC135 Service Manual page 85

1. Defective ITS (Integrated Telephone System) Section
a. 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" in 2.3.3.5. Analog Board Section is useful for
this investigation.
b. No pulse dialing
c. No ring tone (or No bell)
d. No tone dialing
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KX-FPC135 / KX-FPC141