Thermal Dynamics CUTMASTER 60i Service Manual page 55

d. If all the LEDS now light there is a short at the other end of either the J302 or J303 harness. Plug them in
one at a time to determine which one is loading the Bias down.
i. J302 goes to the PFC board at J800 and the Inverter board at J610. Disconnect each of these in turn
and replace the board that was loading it down.
ii. J303 goes to the Inverter board. If J303 is loading the Bias down, disconnect the ribbon cables at J600,
the fan at J608, the current transducer at J601. If the unit is equipped with an Automation Interface
board disconnect its harness at J609.
iia. Now if any of the Bias supply LEDs are being loaded down replace the Inverter board.
Otherwise reconnect the removed connectors one at a time to find what component is causing
the problem and replace that.
e. Control board LED D101 illuminated indicates +15V is supplied to the board and the blinking "Heartbeat"
LED, D135, indicates the microprocessor is operating.
f. If D101 does not light it may indicate +15V not getting to the board. If the display, front of the board, is
dark, measure for +15V at TP100_15V relative to TP1_GND on the back side of the Control & Display
board If +15V is present it may be only the LED is defective.
C115 C116
R123
C119
C123
R134
C127
C
C128
TP100_
15V
R164
R166
R168
R171
C140
C141
R184
R188
C145
C147
R198
R201
R204
R207
U108
C154
C155
R212
R214
1 NORM
1 PROG
1
D135
GREEN
YELLOW
C
ORANGE
RED
BROWN
BLACK
i. +15V comes over the ribbon cable from the Inverter board. If no +15V and no display on the Control
board remove the ribbon cable from the Control & Display board and measure for +15V on the end
of the disconnected ribbon cable at pins 5 & 6 with ground on any of pins 2, 4, 8, or 10 of the ribbon
cable connector. You will need a small probe, no more than 0.025" dia. A paper clip is too big and can
damage the connector.
Manual 0-5475
C117
2
R120
R121
R122
C118
C120 1
R128
R127
R131
C124
R135
C125 R132
R136
R110
R137
U104 R107
C106
U101
R109
33
1 U102
R172
R265
D101
U110
R173
R139
D149
R144
D150
R150
R190
C144
R152
R194
C148 R158
C149
C138
D156
D147
D158
C156
R215
R216
D159
C157
R217
R219
D161
R221
D162
U112 C159
R222
D159
R244
R245
R246
R247
R248
R249
1
R250
J103
J101
J100
R129 R130
C121
R133
D179
C126
C174
U106
R138 C129
R143
R146
C130
R151
R147
R112
R267
C108 R155
R113
R160
R163
R268
R161
R165
R167
R169 R170
R175
C139
R174
D152
R180
R179
R185
R183
D151
R186
R187
R191
R192
R195
R197
C146 R193
U109 R200
R199
D154
C150 R203
R202
C151
R208
R223 R205 R206
R227
R209
D165 C153
R230
D167
D168
R240
D170
C167
C158 R218
R255
R220
D173
C172
D163
C160
R264
R224
U113
R228
C161 R226
D164
R229
D166
C162
C164
C163
R234
R236
R237
C165
R239
R241
C166
R243 R251
R252
R254
D171 D172
C169
C170
D174
R259
R258
R260
D176
R261 C173 D175
R262
SERVICE
CUTMASTER 60i
50
49
D178
R140
C
D144
C132
R145
R148 R149
C134
R153 C135
R154
R108
C136
R162 D146
D148
U107
U111
R177
R176
R178
R181
R182
C142
C143
R189
R196
D153
D155
C152
R210
R211
D157
C
R233
R232
R231
R235
R238
D169
R242
R253
C168
U114
R256
R257
C171
C
D177
R263
R266
Art # A-13301
5-21