cutmaster 102
SERVICE 5-8 Manual 0-4998
5.06 Circuit Fault Isolation
WARNING
The following procedures should not be attempted
by anyone who has not had proper training or
authorized to do so.
A. Cover Removal
1. Remove the upper and lower screws which
secure the cover to the main assembly. Do not
loosen the lower screws inside the cut out slots
in the bottom of the cover.
Note
The upper screws and lower screws are not the
same. Do not mix them. The upper screws are
for threading into the plastic of the front and rear
panels. DO NOT use the finer threaded lower
screws for this.
Upper
Screws
Lower
Screws
Lower
Screws
Art # A-07947
Slots
2. Carefully pull the Cover up and away from the
unit.
B. Cover Installation
1. Reverse previous procedures for cover installa-
tion.
NOTE
When installing the upper screws, attempt to
reuse the original threads. The easaiest way to
do this is by turning the screw counter-clockwise
until you feel the threads lign up, then begin to
turn the screw clockwise to tighten to 15-18 in.
lbs.. Do not over tighten.
C. Pre Power Up Tests
Prior to applying primary line power to the unit,
perform the following checks to prevent component
failure or blowing primary fuses. The troubleshoot-
ing guide will assume these tests were done and no
failure was found or that any failures found were
corrected.
1. Main Contactor (W1) Check - Section 5.11 A
2. PCB 1 Input Diode D1 Test - Section 5.11 B
3. PCB 5 Input Diode D1 Test- Section 5.11 C
4. PCB 2 Capacitor / Relay Test - Section 5.11 D
5. PCB 1 IGBT Test - Section 5.11E
6. PCB 5 IGBT Test - Section 5.11 F
7. PCB 1 Output Diode Test - Section 5.11G
8. PCB 5 Output Diode Test - Section 5.11H
9. PCB 1 Pilot IGBT Test - Section 5.11I
If no fault is found in Pre Power-Up Tests 2-6, skip
steps 10-14.
If a fault is found in Pre Power-Up Tests 2-6 remove
PCB 2 and perform the following Pre Power-Up Tests
to determine which PCBs have failed.
10. PCB 2 Capacitor / Relay Test - Section 5.11J
11. PCB 1 Input Diode (D1) Test - Section 5.11K
12. PCB 5 Input Diode (D1) Test - Section 5.11L
13. PCB 1 IGBT Test - Section 5.11M
14. PCB 5 IGBT Test - Section 5.11N
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