3.5 Magnet Rack, Disassembly, Assembly and Adjusting
See figures on page 36.
Remove the magnet rack as described on page 33.
This is what to do if a magnet (7) is to be replaced, or a complete cleaning is to be done.
Remove the support list (1) and the sponge list (5). Remove the two screws which were hidden under the
sponge list (5). This will make the guide list (8) for the long pivot arm come loose. This, with all the pivot
arms, should be placed aside.
To replace a magnet (7), unscrew the five screws holding the locking list (6), remove the locking list (6),
and pull out the magnet (7) with a narrow pair of pliers.
The magnet can be measured with a multimeter, and if the magnet is OK, the internal resistance should
be between 185 and 220 ohm.
When inserting a new magnet, the magnet should be inserted exactly the same way as the rest of the
magnets. (Observe the small spikes which come out of the soldering on the magnets). If two magnets are
placed with these spikes against each other, the Printer will probably make two dots instead of one when
one of these magnets is engaged. Also make sure that the connectors on the new magnet are placed
exactly in the connectors in the printed circuit board.
The assembly is done in reverse order.
Mount the guide list (8) with the pivot arms on the magnet rack.
Observe the following:
The support list (1) must be adjusted and fastened so the gap between the support list (1) and the long
pivot arms (3) is 0.8 mm, when the long pivot arm is against the magnet. Use a feeler gauge to check this
adjustment.
The sponge list (5) must be adjusted and fastened so the sponges (4) barely touches the top of the long
pivot arms (3) when the magnets are released.
How to replace a long pivot arm:
See figures on page 36.
Remove the magnet rack as described on page 33. Remove the support list (1) and the sponge list (5).
Now, loosen the screws (17). Note! Do not try to unscrew the screws (17) completely. They should only
be loosened about one revolution. Use, e.g. a small screwdriver to slide the pivot arm shaft sideways until
the defect pivot arm is loose. Take it out and replace it with a new one. Put the pivot arm in the position
so that you can slide the shaft back in place. Repeat this for each loose pivot arm until the shaft is approx.
in the centre on the magnet rack. When tightening the small screws (17), pull at the same time the pivot
arm shaft into its slot. And do not over tighten, these screws are fragile!
Assemble the magnet rack as described above.
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