Thermal Dynamics CUTMASTER 60i Service Manual page 49

4. PFC Board IGBT Test. Measure between Bridge + to GND PRI (assumes PFC inductors L1 & L2 remain con-
nected.).
!
a. With meter on the diode scale place + meter lead on GND_PRI and – lead on BRIDGE +. It should read
as a diode in the forward direction with value similar to the PFC Diode, a little lower than the bridge
rectifier (step 2), (about 0.3V to 0.4V on Fluke meter.)
b. If reading is much lower (short) replace the PFC board.
c. If the reading is higher or slowly increasing, capacitor charging, you may have mixed up your + and –
meter leads. Reverse them and if the reading is still high, high in both directions, replace the PFC board.
Manual 0-5475
CAUTION
Single phase and 3 phase PFC boards are different, have different
catalog numbers! Using the wrong one may cause it to fail
+15V
J303
6
3
HS302
Art # A-13329
GRN/YEL
3Ø
1Ø
MOV300 MOV301 MOV302
MOV304
MOV305
GND PRI BRIDGE+
TP8 TP23
15 UV LO LINE
J302
-
TP22
D302
+
HI LINE
TP4
TP21
ACINSEN BUS CHK +15V PRI
D303
1 C301
C300
1
T301
C303
+
4
+24V
1
D304
C305
J304
D307 -15V
1
C307
SERVICE
CUTMASTER 60i
.
E300
CHASSIS
GND
1
K300
MOV306
R300 R301
1
T300
R302 R303
C302
J305
1
5-15