Kenwood TM-631A Instruction Manual page 4

The power requirement is 13.8 VDC.
Never attempt connection to a 24 VDC source.
Do not place the unit in areas of excessive dust, high hu-
midity or on unstable surfaces.
Do not drop pieces of metal, needles, coins and other elec-
trically conductive materials into the unit.
Do not pull the power cord, when disconnecting it from the
AC wall outlet. Grasp the plug and ensure that your fingers
do not touch the live pins.
If an abnormal odor or smoke is detected, immediately turn
the power off and pull out the power plug. Contact the
KENWOOD service station or your dealer.
CLEANING
1. Turn the power off, before cleaning the unit.
2. Do not use any type of abrasive pad, thinner, benzine
or any substances which may damage the unit.
3. Wipe the front panel and other exterior surfaces of the
unit with a soft dry cloth or a soft cloth lightly moistened
with water.