Panasonic KX-TG7731S Service Manual page 48

KX-TG7731S/KX-TG7732S/KX-TG7733S/KX-TGA470S
Case1: OK
AC power on
PIO01
0.06sec
1.4sec
Case2: NG1(fail to reset BT_IC)
AC power on
PIO01
1.4sec
Case3: NG2 (fail to receive of UART signals)
AC power on
PIO01
1.4sec
Case4: NG3 (fail to transmit of UART signals)
AC power on
PIO01
1.4sec
Cross Reference:
Schematic Diagram (Base Unit_RF) (P.76)
Note:
(*2) After replacing, need to adjust the frequency of BT.
Refer to Things to Do after Replacing IC or X'tal (P.63)
3.6sec
2.8sec
If BT_IC does not work, 1st and 2nd signals does not
appear.
If BT_IC fails to receive of UART, 2nd signal does not turn
to HIGH.
If BT_IC fails to transmit of UART, 2nd signal does not turn
to LOW.
48
Check the circuit of around
POWER and RESET parts
of BT Module.
Check the circuit of around
UART communication (*1) of
main board and BT module.
still NG
Replace BT module (*2)