Panasonic KX-FP701LA Service Manual page 123

12.5.6.2. Defective ITS (Integrated Telephone System) Section
1. No handset transmission / reception and no monitor 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 (receiv-
ing), or between the microphone and the telephone line (sending), or between the telephone line and the speaker (receiving).
Check the components at that point. 12.5.6.1.Check Sheet for Signal Route (P.122) is useful for this investigation.
2. No pulse dialing
3. No ring tone (or No bell)
REFERENCE:
12.5.6.1.Check Sheet for Signal Route (P.122)
6.7.NCU Section (P.43)
4. No tone dialing
REFERENCE:
12.5.6.1.Check Sheet for Signal Route (P.122)
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KX-FP701LA