cartridge/arm/turntable problem. Usually all that is needed to eliminate the hum
is to run a ground wire from the turntable chassis to the chassis of the amplifier
or receiver. Simply attach a suitable length of thin, flexible wire (test probe wire
is ideal) to any convenient screw on the underside of the MK-3 chassis. Connect
the other end to the ground connector on the amplifier or receiver (if in doubt,
check the amplifier or receiver’s manual or call its manufacturer).
9.2 Depending upon the tonearm you are using, it may also be possible to run a
short wire from the turntable chassis to the arm’s ground connection under the
arm board. If this does not cure the hum, disconnect the short wire and run a
separate ground wire as above. If running a ground wire from the chassis does
not eliminate the hum, there may be a more complex problem involving the
particular arm/cartridge combination. VPI will attempt to provide assistance, but
please understand that it is not possible for us to be familiar with all the
numerous arm/cartridge combinations. You may also want to contact both the
arm and cartridge manufacturers.
9.3 Motor overheating—synchronous motors, such as the one used in the HW-19
Mk. 111, normally show a 30 degree to 40 degree C rise in temperature after
they have been running for a while. Therefore, you can expect that the motor
pulley will become hot to the touch. It’s perfectly normal. Relax and forget about
it.
9.4 Motor does not turn smoothly—when they are turned off, synchronous motors do
not turn as easily as Induction motors. If you attempt to rotate the motor pulley
by hand, you will feel some resistance. You will notice that it “jumps” from
position to position as it turns. This is the result of the multiple-pole internal
permanent magnet. Again, it’s perfectly normal. Keep relaxing.
9.5 Noisy motor—some noise is normal from the type of synchronous motor used on
the MK-3. You needn’t be concerned unless: 1) you can hear motor noise
through the loudspeakers while playing records (make sure it’s not just with one
or two records); or 2) you can hear the noise from across the room when no
record is being played (not through the loudspeakers). If either of these
conditions is apparent, please contact your dealer or the factory for assistance.
10. MAINTENANCE
10.1 The drive belt on the HW-19 Mk. 111 is made of pyrothane and, under ordinary
conditions, will provide long service. Dusting the belt every three months with
talcum powder will provide for a smoother start up and turn off. For optimum
performance we recommend installing a new drive belt every two years. There is
enough powder in the bag for many, many powderings. Seal the bag and shake
the belt around in it. Shake excess powder back into the bag as you remove the
belt. Shake off all loose powder.
10.2 The main bearing of the turntable and the bearing of the motor should both be
lubricated using 40 weight motor oil. Slick 50 is preferred, but any good motor oil
will do. One drop on the motor shaft, and two drops on the main bearing shaft
and two down the hole of the main bearing well, is sufficient.
10.3 NOTE: Compounds containing silicones are not recommended for use on or near
any electronic equipment. While silicone polishes give a high-luster finish,
another property of silicones is migration. The tiniest amount can spread itself in
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