Check The Bus Side Components - Kodak 5KVA-220V Service Manual

SERVICE MANUAL

3.2 Check the bus side components

Power devices
DC/DC IGBT: Q30/Q29/Q27/Q28
QB2
Parts
Q27/Q28/Q29/Q30
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.
Note: If one or more of them were damaged, please replace all of them.
V201703A
QD2 QA1 QC1 Q32
Attribute
1
Resistor
Diode
D13 Q30 Q29 Q27
Reference values
GE: 47.8 ohm
GC: 196.3k
CE:400-500K
EC: 0.39V
CE: OL
16
5KVA-220V/230V
Q28
Failure status
Short or explosion