ElcoBrandt SUPREME DED400XP1, Руководство по обслуживанию, Страница: 65 / 92

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Cause:
a. The switch and/or relative indicator led may be defective. In this case
the circuit board needs to be replaced.
You can assume that the fault lies with the switch circuit board when
individual leds do not work (switch or led fault) or when no leds on the
circuit board light up (which however may also be due to no contact being
made with safety switch located at the back on the bottom left of the
machine or the machine safety fuse system being faulty – for example, due
to the grinder being overtaxed; attention, in this case, first look to see
whether any foreign bodies are obstructing the grinder movement!!) In the
above mentioned cases, you should concentrate on replacing the switch
circuit board, but first check to make sure that the flat-cable connection
running between the switch circuit board and the main switch board is
plugged in correctly.
b. The fault could be due to normal wear and use of the circuit boards; the
relative maintenance instruction highlights the importance of changing the
main circuit.
Before changing the main circuit board, check that the fault is not due to
the switch circuit board.
Solution:
To a.
The switch circuit board needs to be disassembled following the
procedure illustrated further on. However, first check that that the
cable on the circuit board is plugged in correctly and (when you have
checked) proceed to disassemble the switch circuit board from its
frame on the machine.
To b.
Please check that it is absolutely necessary to replace the main circuit
board as, in order to access it, an entire sector of the machine has to
be >>disassembled<<.
Before carrying out the required work procedures, please read the
following general notes and recommendations, and especially the
safety advice notes for service engineers, remembering to follow them
at all times.