Panasonic KX-FG2452CX Service Manual page 142

KX-FG2452CX
12.5.5.1. Digital Block Diagram
You also need to check the signal lines listed here [List 1] when the unit fails to boot up the system. Those signal lines should
remain normal. Other signal lines are not directly related to that failure even if they have faults or troubles.
As long as these signals remain normal, once the power is turned on, each IC can repeatedly output 3.3V (H) and 0V (L). The
following shows NG and normal wave patterns.
NG Wave pattern
Note:
Refer to NG Example (P.147).
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