Panasonic KX-MB1520FX7 Service Manual page 200

KX-MB1520FX7/KX-MB1520FX8/KX-MB1520FXW/KX-MB1530FX7/KX-MB1530FXW
12.3.23.3. Broken Parts Repair Details
(D11-D14)
If D11-D14 are short-circuit, F2 will melt (open).
In this case, replace all of the parts (D11-D14, F2).
(C5)
If overvoltage (Approx. 450V) was supplied for a power supply unit, C5 will be broken.
(Q1)
If Q1 is short-circuit, F2 will melt (open).
In this case, replace all of the parts (F2, Q1,D11-D14).
(F101)
If F101 is melted (open), check the 24 Voltage line of the Main Board and others.
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