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CIRCUIT DIAGRAM, CIRCUIT BOARD AP02
AP02 (POSITIVE) CIRCUIT BOARD 481 803 - -880 / - - 882 / - -889
The - -880 variant is used in the LHN 140, the - - 882 variant in the LHN 200 and the - - 889
variant in LHN 130.
The - -889 variant has the same design as the - - 880 variant, the only difference is that transistor
Q6 isn't mounted at the - - 889 variant.
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 on removing and fitting the circuit board are to be found on page 28.
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 24) 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.
cmha2de1
- - 20 - -
cmha2e06
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