Panasonic KX-F910BX Service Manual page 67

(2) Defective TAM interface section
1 Not arriving in TAM, FAX turn on.
Is the installed bell ring num-
ber of TAM less than that of
KX-F910BX?
YES
Check the EXT. TAM Hook
detection circuit.
RL101, VAR1, R103, PC105
2 A FAX is coming but won't switch from TAM to FAX
Printing?
NO
CNG
Is the FAX from the other
party CNG or no-sound?
Check the path to the modem input and refer
to the TAM INTERFACE SECTION.
See the CHECK SHEET and SCHEMATIC.
3 A voice is coming in but switches to FAX
Check the VOX circuit and refer to the
TAM INTERFACE SECTION.
See the CHECK SHEET and SCHEMATIC.
Hint: You can monitor the VOX signal on service mode 815.
When a VOX (sound) is detected, "Vx" will be shown on the LCD.
NO
Install a bell ring number of
TAM less than that of KX-F910BX.
YES
NO SOUND
| 71 |
Wait.
Check VOX circuit and refer to the
TAM INTERFACE SECTION.
See the CHECK SHEET and SCHEMATIC.
KX-F910BX