3B Scientific Teltron Electron Diffraction Tube S - Manual (Page 4)

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3) Carefully pull the guide pillar up at an angle,
making sure that the LED is not damaged. 4) Undo the screws holding the printed circuit
board. Be careful, because the screw is inside a
spacer ring, which you must not lose.
5) Carefully pull the board forwards and lift the
terminal sockets out of their guides.
6) Unsolder resistor R2 (33 kΩ) and replace it
with the supplied 390-kΩ resistor.
7) Put the circuit board back in place and secure
it with screws. First push the screw through the
hole and slip the spacer over the screw before
tightening. 8) Be especially careful when inserting the guide
pillar again to make sure that the LED does not
get bent over. You should get the base in place
first and check the positioning of the LED, then
press the bar down and snap it into place.
9) Use screws to secure the guide pillar from
below.