维修手册
专案名称：
Axpert Max 7200-48
专案编号：
P1911061
修订版次：
00
PAGE
V-RDP-004-73 A
Power devices
DC/DC MOSFET: Q24/Q21/Q38 & Q40/Q26/Q19 & Q17/Q11/Q20 & Q13/Q23/Q18
For Axpert Max-7200 ALL of the MOSFET are
(MOSFET IR/IRFP4668PBF 130A 200V N BULK TO-247)
Parts Attribute Reference values Failure status
IRFP4668PBF Resistor GS: 15.67k
GD: 510.0k
DS: 581.0k
Short or explosion
Diode SD: 0.556V
DS: OL
Note1: When you use the multimeter to measure the resistor of the transistor, because of
the capacitor in the circuit, it will cause the changing of the values when you measure the
DS and GD. So we recommend you measure the diode forward voltage of SD, and the
resistor of GS. These two values can reflect the situation of the transistor more correctly.
Note2: If one or more of them were damaged, please replace all of them.
3.1.1. Drivers (This part is only used for repair checking)
Note: Drivers usually need to be checked when users want to repair the boards. Because
when power devices were damaged, the high voltage will rush to driver circuit through the
gates of power devices.
The reference of the resistors list as below:
R76/R78/R80/R93/R92/R64
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