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The JMW-3D tone arm comes with one large dropped counterweight
installed on the rear shaft of the tonearm. For most cartridges you will
only need this large weight. The counterweight is held in position by a
setscrew.
DO NOT OVER TIGHTEN THIS SET SCREW.
Pick up the arm tube, taking care not to strain or damage the fine wire
and Lemo connector.
For now, position the large counterweight as close to the bearing housing
as you can (toward the front of the arm) but not touching the balance
ring. The object here is to balance the arm while keeping the
counterweight as close to the bearing housing as possible. This results in
the least inertia for a given cartridge weight.
In some rare cases it may be necessary to use two counterweights
together or a larger counterweight. Contact your dealer if a second or
larger counterweight is needed.
C- ALIGNMENT
Place the arm tube assembly on the lower bearing, taking care not to
strain or damage the wire and Lemo connector. Make sure the unipivot is
centered in the female bearing, the arm should feel free in all directions.
Place the arm in its rest.
At the rear of the arm base assembly is the connector block. Plug the
Lemo connector into its receptacle on top of the block. Notice that the
connector can plug in only one way. Align the red dots on the arms plug
with the red dot on the receptacle. Push gently, do not force the plug.
Do not attach the anti-skate filament at this time if at all.
Make sure the turntable is level. Refer to your turntable instructions and
use a bubble level to check level. In most cases, the best place to put the
level is on the platter.
With a unipivot arm it is particularly important to level the turntable.
Move the counterweight until the arm has a very slight downward
tracking force, just enough to keep it on the supplied alignment jig and
not move.
This alignment will yield the lowest distortion in the last third of the
record, the hardest to track, when playing a typical 12" record. Do not go
crazy over this adjustment. You do not know if the stylus is aligned
properly on the cantilever. You are also facing a constantly moving target