Thermal Dynamics CUTMASTER 60i Service Manual page 54

CUTMASTER 60i
Unless otherwise stated GND _PRI is the common for all primary side voltage measurements. For secondary mea-
surements the Work lead or its Dinse socket can be used for secondary common. The following tests are intended
to done in the sequence presented. Skipping steps, unless direct to, can result in incorrect diagnosis.
Power ON / Start Up
!
1. Turn on the rear panel circuit breaker and energize the outlet, if it was de-energized. At power on several
things occur, the Bias supply starts up, the display comes on and the fan starts at low speed. There is a short
purge of gas testing for gas pressure.
2. Bias Supply checks at Power On
In approximately 4 seconds expect Bias board 4 LEDs, +15V PRI (D327); +15V (D336); -15V (D340); +24V (D337),
to light on the Bias board and one LED, D101, on the rear of the Control board followed by a second Control
board LED, D135, that blinks slowly. If all expected Bias and control board LEDs light skip to step #3.
+15V
+15V
J303
6 4
+24V
3 1
HS302
+24V
D307
C307
a. If all Bias LEDS light but either of the Control & Display LEDs do not, skip to step #2e.
b. If none of the Bias LEDs light test for input power.
i. Verify the unit is plugged in and the outlet has power. Verify the rear panel circuit breaker (CB1) is
turned on. Test for AC input voltage between the 2 AC terminals of the D300 bridge rectifier if single
phase or all 3 AC terminals if 3 phase.
ii. Measure for DC voltage between the GND PRI (-) and BRIDGE+ terminals. DC Voltage should be
approximately the same as the phase to phase AC voltage.
iii. Now measure from GND PRI (-) to J305-3. The voltage may be as high as 750VDC. The Bias board
should operate at any voltage over 230 VDC. If not replace the Bias board.
c. If some of the Bias LEDs don't light but at least one does, shut off power to the unit. Allow at least one
minute for capacitor bleed down then disconnect J302 & 303 on the Bias board. Turn power back on. If
all the LEDs still don't light replace the Bias board.
5-20
CAUTION
This procedure assumes the previous resistance tests have been
performed. If not go do them now.
E300
CHASSIS
GND
GRN/YEL
3Ø
1Ø
MOV300 MOV301 MOV302
MOV304
MOV305
GND PRI
BRIDGE+
K300
MOV306
TP8 TP23
15 UV LO LINE
R300 R301
1
J302
TP22
D302
HI LINE
TP4 TP21
ACINSEN +15V PRI
BUS CHK
T300
D303
1 C301
C300
R302 R303
1
T301
+15V
-15V
C303
PRI
+
D304
C305
J305
J304
-15V 1
1
C117
2
C115 C116 R120
R121
R122
C118
R123
C120 1
R128
R127
C119 R131
C123 C124
R135
R134 C125 R132
R136
C127 R110
C
R137
C128
U104 R107
TP100_
U101 C106
R109 33
1
C130
R147
15V
R112
C108
R113
R164 1 U102
R166
R168
R169
R171 R172
R265
C140
U110 R173
R139
C141
D149
R144
R184
D150
R188
R150
R190
C145 C144
D101 R152
R194
C147 R158
C148 C149
R198
C138
R201 D156
D147 R202
R204
R207
U108 R223
C154
R227
C155
D165
R212 D158 R230
C156
R214 D167
D168
R215
R216
R240
D159
C157 D170
C167
R217
R255
R219
D161 D173
C172
D162 R221
R264
U112 C159
1 NORM R222
1 PROG
1
R244
GREEN
D135
C302 R245
YELLOW D159
R246
C
ORANGE
RED
R247
BROWN
R248
R249
BLACK 1
R250
J101 J103
SERVICE
J100
50
R129 R130 49
C121
D178
R133
R140
C
D179 D144
C126
C132
R145
R148 R149
C134
C174
R153
C135
R108 R154
C136
R162 D146
U106 R138 C129 D148
R143
U107
R146
R151
R267
R155
R160
R163
R161 R268
R167 R165
R170
U111 R177
R175
C139
R176 R178
R174 R181
D152
R180
R179 R182
R185
R183 C142
D151
R186 C143
R187
R189
R191
R195 R192 R196
R197 D153
U109 R200 C146 R193
R199 D155
D154
C150 R203
C152
C151
R205 R206 R208
R210
R209 D157 R211
C153
C
C158 R218
R220
D163
C160
R224
U113
R228 C161 R226
D164
R229
R233
D166
C162
R232
R231
C164
C163
R235
R234
R236
R238
R237
C165
D169
R239
R241
C166 R242
R251
R243 R252 R253
D171 D172 R254 C168
U114
C169 R256
D174 C170
R259
R258 R260 R257 C171
C
D176 D177
R263
R261 C173 D175
R266
R262
Art # A-13303
Manual 0-5475