Checking the thyristor KU112A. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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When repairing switching power supplies (BPI-13, MPI-311, MP-1, MP3-3, MP-403-1, etc.), it becomes necessary to check the thyristor. With a faulty KU112A and analogues, among other things, the most expensive part burns out - a power transistor. To test the thyristor, in most cases, the energy of a one and a half volt power supply of the mini-tester in the "x1 kOhm" mode is sufficient.
When briefly touching the control output with a probe connected to the anode (see figure), the arrow should deviate. The return of the arrow (after removing the probe from the control output) indicates that the thyristor has lost the ability to hold the open state. If the test fails, swap the probes (for some devices, switching to the "x1 kOhm" mode reverses the polarity).
Do not throw away a bad thyristor! Not only me, many of my colleagues paid attention to the almost mystical phenomenon of self-healing of some parts (lamps and semiconductors) during long-term (about 2 years) storage...
Author: Yu.Borodaty
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