Panasonic KX-FB423CN Manual page 316

6.5.9.3. DETECTIVE TAM INTERFACE SECTION
A FAX is received, but won´t switch from TAM to FAX.
CROSS REFERENCE:
ANALOG BOARD SECTION (P.103)
TAM INTERFACE SECTION (P.166)
6.5.10. OPERATION BOARD SECTION
1. NO KEY OPERATION
2. NO LCD INDICATION
CROSS REFERENCE:
TEST FUNCTIONS (P.57)
105
KX-FB423CN