Panasonic KX-MB2230JT - Abnormal Detect and Lock Protect Block; Waveform

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KX-MB2230JT/ KX-MB2270JT/ KX-MB2515JT/ KX-MB2545JT/ KX-MB2575JT/ DP-MB310JT
6.9.5. Waveform
6.9.6. Abnormal Detect and Lock Protect Block
This block detects the FAN abnormal condition such as FAN motor lock or Extra low current caused by insufficient connector inser-
tion of FAN.
When FAN motor abnormal condition occurs, it may cause damage to FAN itself and machine by the overheat.
So at the abnormal condition, FAN motor current must be stopped automatically and machine operation must be stopped.
When error condition is detected, display shows "Call Service 4"
3.3V
3.3V
3.1V
0.6V
0.6V
24V
20V
30KHz
3.3V
1.2V
1.2V
0.6V
0.6V
12V
9.8V
(1)Full speed (H:20usec/Div)
Point D(1V/Div)
Point C(2V/Div)
Point B(2V/Div)
Point A(2V/Div)
Point F(5V/Div)
Point E(10V/Div)
Point D(1V/Div)
(2)Half speed (H:20usec/Div)
Point D(1V/Div)
Point C(2V/Div)
Point B(2V/Div)
Point A(2V/Div)
Point F(5V/Div)
Point E(10V/Div)
Point D(1V/Div)
Ground level
Ground level
Peak Level
Peak Level
Ground level