Panasonic KX-FT21BX Service Manual page 107

A
Is pin 154 of IC1 on the digital board
at 3.3V?
YES
Check IC7 on the digital board.
B
Observe the waveform at test point TP12
on the digital board with an oscilloscope
(while scanning the white panel).
YES
Apply a trigger at the rising edge of CH2
given the following settings :
CH1 0.2V/div connect to TP12.
CH2 5V/div connect to TP14.
Time 1ms/div
NO
Check IC1 on the digital board.
NO
Check the image sensor.
0.2V
- 81 -
0.8V
KX-FT21LA