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1sxx02cw
Overview test
Each block consist of at least two serviceable parts. The first step of control is taking
overview and checking if any parts are looking abnormal. Broken parts can have marks of
thermal damage, change of colors or shape. If after that checking nothing was find out next
step is electrical testing.
Rectifier test
The first part for test is input rectifier consisted of diodes and two heatsinks (details no 15).
One heatsink is on positive potential and second on negative one. For checking diodes
following steps can be achieved:
1. Use measuring instrument with semiconductor conduction test possibility. Connect one
terminal to one phase AC input ( detail no 9) and second to front (opposite side to AC
terminals) heatsink (detail no. 15). If diode is conducting from AC to heatsink, replace
measuring terminals and check if diode is blocked. If so, diode is working properly in
this phase.
2. Next check second diode in this phase by opposite side conduction test. Diode can
conduct from heatsink to AC terminal. If so diode in this phase is working properly.
3. If diode is short circuited or non conducted in both sides it means diode is broken and
its replace is necessary. Diode is screwed into aluminum heatsink and has to be
carefully removed and new one screwed with torque 10Nm/90lb.in
4. Repeat that test in other phases.
Important note -- in case of damage of any diode replace both in each broken switch.
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