Axpert Max 7200 - Page 14

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
Parts Attribute Reference values Failure status
Q27/Q28/Q29/Q30
Q45/Q37/Q35/Q31
Resistor GE: 22.9 ohm
GC: 169.4k
EC: 169.1K
Short or explosion
Diode EC: 0.358V
CE: 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
CE and GE. So we recommend you measure the diode forward voltage of EC, and the
resistor of GE. 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.
Drivers (This part is only used for repair checking)
Meanwhile, we also need to check the driver tubes of these power tubes.
R91/R103/R102/R300/R96/R106/R101/R238: (22R 1206)
R90/R105/R99/R302/R94/R109/R97/R239: (0R 1206)
D32/D60/D35/D62/D33/D61/D34/D66: (1N4148W 0.15A 75V SMD)
Parts Attribute Reference values Failure status
R91/R103/R102/R300/
R96/R106/R101/R238
Resistor 22 ohm Open or other
values
R90/R105/R99/R302
/R94/R109/R97/R239
Resistor 0 ohm