Panasonic KX-FT21BX Service Manual page 96

KX-FT21LA
When all waveforms are OK.
Reconfirm RESET.
IC malfunction
Other NG examples while the power is ON and the LCD displays the following.
LCD display CALL SERVICE
RESET
RESET
WDERR
Example
This display occurs when the temperature of the thermistor
on the terminal head is NG.
Faulty connection of the thermal head connector.
ASIC IC1 pins 193 and 207 or the thermistor on the thermal head is NG.
3.3V
LCD display
OK
OK
- 70 -
NG
Check the LCD.
ASIC
Chip
Open the circuit inside.
Replace the CPU.