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On all of these measurements measure on the terminal or the PCB pad, not the screw head. The screw has a coating
that may not be conductive.
1. Measure inrush resistors.
Set meter to Ohms scale. Measure from Bridge+ to square pad to the right of Bridge+. Normal resistance
should be 47 ohms +/- 3.
a. If higher, including open, or if resistors show sign of excess heat, discolored or cracked, replace the Bias
PCB
b. If lower such as zero or only a few ohms the inrush SCR in the main rectifier bridge D300, (under the
Bias PCB) is shorted. Replace the bridge which requires removing the Bias board. Perform the inrush
resistor test (1) before reinstalling the Bias board.
Manual 0-5475
TP8
15 UV
TP22
HI LINE
TP4
ACINSEN
1
C303
+15V
J303
+
6
4
+24V
3
1
HS302
D304
C305
D307
Art # A-13325
C307
NOTE!
The cause of the open inrush resistor may
be on another board. Before applying power
complete the rest of these resistance tests.
SERVICE
E300
CHASSIS
GND
GRN/YEL
3Ø
1Ø
MOV300 MOV301 MOV302
MOV304
MOV305
GND PRI
BRIDGE+
K300
MOV306
TP23
LO LINE
R300
1
J302
-
D302
+
TP21
BUS CHK
+15V PRI
T300
D303
C301
C300
R302
1
T301
J305
J304
-15V
1
1
CUTMASTER 60i
1
R301
R303
C302
5-11
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Table of Contents
Troubleshooting
