ESAB LTR 160, Руководство по обслуживанию

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TRANSISTOR BOARD AP02
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Simpified circuit diagram for transistor board AP02 (positive)
The --880 variant is used in the LTR 160 and the --882 variant is used in the LTR 200..
Individual transistors must not be replaced: if the circuit board is faulty, it must be replaced
in its entirety. In addition, circuit board AP03 must also be replaced.
Instructions for removing and fitting the circuit board are to be found on page 37.
A01, A02 Connections A01 -- A02 are for the gate pulses from circuit board AP01.
D1 -- D3 Transient voltage protection.
D5
Back--emf protection diode (squelch diode), for main transformer TC02
when the transistors turn off.
F1 Fuse, for protection of circuit board AP01 if circuit board AP02 fails.
Q1 -- Q8
MOSFET transistors. These require a special instrument.
See MOS TESTER on page 32 for testing.
Due to a change to transistors with higher current rating, the circuit board
may have one transistor less than specified in the diagram above.