Panasonic KMF0209634C2, Service Manual

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3.3.6.1 DIGITAL BLOCK DIAGRAM
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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 faultsor troubles.
As long as these signals remain normal, once the power is turned on, each IC can repeatedly output
5V (H) and 0V (L). The following shows NG and normal wave patterns.
NG Wave pattern (Refer to NG EXAMPLE)
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