Moerch UP-4 Owners manual

H. H. MØRCH

UP-4

Instructions

Contents of the packing

In the packing of the tonearm you will find the arm base in which the bearing is encapsulated in a
heavy body. This is the link between the moveable part of the tonearm and the arm pillar, which is to
be mounted in a bush in the board of the turntable.

Further you will find one arm tube according to the choice that you have had from literature about the
tonearm or from advice of your dealer. There also will be 4 weights, finger lever with screws, knurled
nut, hexagon spanner, and a syringe with silicone fluid.

The tonearm usually is supplied with the arm rest mounted on the pick-up lifter, but if desired a
separate arm rest could be supplied instead.

Mounting the bushes

First it has to be decided exactly where to place the bush in which the tonearm is to be mounted. The
center of the bush should be at a distance of 212 mm (8 11/32'') from the center of the turntable platter
and there has to be room enough for the counterweight rod to move freely. The counterweight rod is
having a rear overhang of 70 mm (2 3/4 ") as to the center of the arm bush. If separate arm rest is
used, it should be placed so that the arm when resting on it is at a suitable distance from the record.

The mounting template on the packing of the tonearm is showing the position of the arm base and the
arm rest as to the turntable spindle. It should be noted that the position of the turntable spindle shown
is just an example. In order to allow for the most convenient position of the arm base the turntable
spindle could have its center anywhere on the arc shown.
Mark the center of the arm bush and check that the distance to the center of the turntable platter is
212 mm (8 11/32"). Then drill a 20 mm (13/16 ") hole with center in this mark. Also, if separate arm
rest is used, drill a 10 mm (13/32 ") hole for the bush for the arm rest about 155 mm (6 1/8 ") in front
the 20 mm hole.

Fastening the two bushes: In order to make it easy to adjust the height of the arm and the arm rest
with the accompanying hexagon spanner, the small screws for fixing the arm and the arm rest should
point to the right.

Then the arm base is fastened in the arm bush.

Mounting the cable to the amplifier

Put the plug of the accompanying tonearm cord into the socket below in the arm pillar. Try to avoid
bending the cable too sharply right next to the tonearm connector. If the turntable has a floating sub
chassis, the cable should not be restricted in any way, and it should be arranged in a suitable arc, so
that it can not limit the free movements of the suspension. Remember that the ground wire should
always be connected to the chassis (ground terminal) of the amplifier. The chassis of the turntable
may also have to be electrically connected to the arm bush.

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Choice of weights and putting them on

In order to make it possible to balance all phono cartridges the tonearm is supplied with three
counterweights - large, medium, and small - having the hole excentrically positioned and with a
tracking force weight having a centrally positioned hole.

The weights that are to be chosen for balancing a cartridge depend on which arm tube that is to be
used and on the weight of the cartridge.
The weights to be used can be found in the below table (tf. means tracking force weight).

At first the counterweight/s is put onto the counterweight rod and then the tracking force weight. To

put on the counterweight/s and to displace them along the counterweight rod they have to
simultaneously be revolved to and fro.

Weight of counterweight in grams when using: Counterweight size: Note:

Light arm
tube
“Green” “Red” “Yellow” “Blue”

1.2-2.4 small only 1

2.5-6.5 0.5-4.3 small + tf. 2

5.2-7.6 3.0-5.4 0-2.2 medium + tf.

7.6-12.7 5.4-10.2 2.6-8.2 medium + small + tf. 2

9.0-9.9 7.0-7.6 4.1-5.0 large + tf.

11.9-21.2 9.9-15.4 6.7-11.3 0-4.8 large + small + tf. 2

19.0-21.2 17.0-19.4 14.0-16.2 6.5-9.0 large + medium + small + tf. 2

Notes:

1. Here the small counterweight is used as tracking force weight.

2. Here both the tracking force weight and the small counterweight are used as tracking force weights.
Each of them gives 1/2 gram of tracking force when slid 1 indentation forwards.

With heavy cartridges or if large tracking force is needed the medium or the large counterweight
should be used for adjusting the tracking force as well. The medium counterweight gives 1.2 g and the
large counterweight gives 2 g when slid 1 indentation forwards.

Thus a certain tracking force can be obtained by sliding more than one weight adding up their shares
of tracking force.

Medium Heavy Extra

Heavy

Refilling the silicone fluid

The accompanying syringe contains 0.5 - 0.6 ml of silicone fluid. At first the pick-up lifter should be
filled in. Pull the black piston out of the lift cylinder and place it in a completely clean place. Then inject

0.1 ml

(10 units) of the fluid behind the shaft inside the lift cylinder. When doing this the lift handle must

be in "lowered" position. When the fluid is injected, the tip of the syringe is "wiped off" on the shaft,
and the syringe is pulled up with a little jerk thereby preventing the fluid from getting in touch with the
walls of the lift cylinder. Do not put the piston back into the lift cylinder until the silicone fluid has
merged down to the bottom of the cylinder, and hereafter the piston must not be pulled up again, as
the silicone fluid would then easily stick to the walls of the lift cylinder. If this happens the piston will
"go down" much too slow.

Thereafter silicone fluid is to be filled into the well of the tone arm. This is done through the hole,
which is seen in the Plexiglas on top of the arm, when the arm tube is not on. The tip of the syringe
can just reach the well through this hole, if the arm base is tilted backwards. Inject 0.2 ml
the silicone fluid into the well and carefully “wipe off” the tip of the syringe on the edge of the well,
before pulling the syringe up with a little jerk. The Plexiglas over the well must not be unscrewed. If
there is too much fluid in the well, it can be taken up with a drinking straw.

(20 units) of

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