Panasonic KX-MB771GR Service Manual page 153

4. No tone dialing
CROSS REFERENCE:
CHECK SHEET (P.151)
12.3.14.3. DETECTIVE TAM INTERFACE SECTION
1. The FAX turns on, but does not arrive through TAM.
CROSS REFERENCE:
TAM INTERFACE SECTION (P.28)
2. A FAX is received, but won't switch from TAM to FAX.
CROSS REFERENCE:
ANALOG SECTION (P.151)
TAM INTERFACE SECTION (P.28)
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KX-MB771GR