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The Constant Fraction Discriminators CFD8c, CFD7x, CFD4c, CFD1c and CFD1x (11.0.1701.1)
3b.4.1
Accessing the jumpers in CFD1c / CFD1x
I.
Disconnect the mains power supply
II.
On the rear panel remove the two screws on the left (red circles, see Figure 3.17b). On the front panel remove the
two screws on the right (red circles) and slightly loosen the two remaining screws on the left (green circles). You may
then remove the right-side panel.
Figure 3.17b: Front and rear panel of CFD1c with marked screws
III.
There is one jumper block with printed instructions beneath it (see Figure 3.16b)
IV.
After adjusting the jumpers close the case and remount all four screws. Make sure to also tighten the other two
screws on the front panel.
3b.4.2
Accessing the jumpers in CFD8c and CFD7x
I.
Disconnect the mains power supply.
II.
On the rear panel remove all five screws (red circles). Please note that different types and sizes of screws are being
used. You should note which screw was used where, so that you will not mix them up when reassembling the device
later. Then remove the two hex bolts (green circles), preferable with a hex nut driver for nut size of 5mm or 3/16”.
III.
On the front panel only remove the upper middle screw (red circle).
Figure 3.18b: Front and rear panel of CFD8c with marked screws
IV.
You may now remove the rear panel and the top cover. (If you do not have a suitable hex nut driver, you may
remove the front panel instead. In this case remove all screws from the front panel and only the upper middle screw
from the rear panel. Please note that remounting the front panel is much more difficult than remounting the rear
panel.)
