Thermal Dynamics CUTMASTER 60i Service Manual page 48

CUTMASTER 60i
3. PFC Board Diode Test. Measure between Bridge + and J305-3 (assumes PFC inductors L1 & L2 remain con-
nected.)
Art # A-13328
a. With meter + lead on BRIDGE + and meter – lead on J305-3 meter on diode scale should read as a diode
in the forward direction, a bit lower resistance than the bridge diodes. about 0.3V to 0.4V on Fluke meter.
b. Reverse the leads, meter - lead on BRIDGE + and meter +lead on J305-3. Meter should show slowly
increasing resistance/voltage (capacitor charging) until meter goes over range.
c. If either or both of these read a short or an open in both directions replace the PFC board.
!
5-14
3Ø
1Ø
MOV304
GND PRI
TP8 TP23
15 UV LO LINE
TP22
HI LINE
TP4
ACINSEN
1
1
T301
C303
+15V
J303 +
6 4
+24V
3 1
HS302 D304
C305
-15V
D307
C307
CAUTION
Single phase and 3 phase PFC boards are different, have different
catalog numbers! Using the wrong one may cause it to fail
SERVICE
E300
CHASSIS
GND
GRN/YEL
MOV300 MOV301 MOV302
1
MOV305
BRIDGE+
K300
MOV306
R300 R301
1
J302
D302
TP21
BUS CHK +15V PRI
T300
D303
C301
C300
R302 R303
C302
J305
J304
1
1
.
Manual 0-5475