8
of the MK-4 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).
Depending upon the tonearm you are using, it may also be possible to run a short
wire from the turntab
le 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.
Motor overheating
—synchronous motors, such as the one used in the HW-19 Mk 4,
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.
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.
Noisy motor
—some noise is normal from the type of synchronous motor used on the
MK-
4. 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
The drive belt on the HW-19 Mk. 4 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.
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.
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 an
extremely thin layer, degrading electrical contacts. Once a contact has been
contaminated with silicone, it is nearly impossible to clean it completely off.
Summary of Contents for HW-19 MK-4
Page 1: ...1 HW 19 MK 4 SETUP MANUAL ...
