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4 Maintenance & Repairs
4.1 Cleaning, Inspection and
Storage
Clean the table frame by wiping it down with a
microfiber cloth. Never use solvent or abrasive or
corrosive compounds.
Products must be cleaned at regular intervals to
remove dust and dirt and inspected for mechanical
damage and normal wear and tear. Worn-out parts
must be replaced.
Unplug the power cord if you do not intend to use the
desk for a long period.
Do not store table or cables in direct sunlight
4.2 User Maintenance
Products are closed units and require no internal
maintenance.
Columns must be inspected at attachment points,
wires, cabinet, and plugs, check that columns function
correctly.
• Inspect the column for loose connections and
damaged plugs/wires.
• Inspect power supply for loose connections and
damaged plugs/wires.
• The power supply and the handset is sealed and
maintenance free.
©Knoll, Inc.
4.3 Repairs
Check all screws and bolts after the first week of use
and tighten screws and bolts where necessary to
ensure safe operation of the table.
If the table cannot be raised or lowered, check the
cable connection between:
• the power supply and the motor/motor house
(column system).
• the handset and the motor/motor house.
• the columns/motors.
• If the table still does not operate, the control system
may have triggered the overheating or duty cycle
protection. Please wait for at least 9 minutes and try
again before proceeding.
If a control unit is replaced, a manual reset (homing) is
required. Follow these steps as section 3.2.
If the table is still not operational, please contact your
vendor for further assistance.
The control system is equipped with safety features; the
intermittency function and the overheating protection
and memory function.
Duty cycle function – The duty cycle factor of the
table 1:9 meaning 1 minute of operation must be
followed by 9 minutes of inactivity. If this limitation is
exceeded, the table will become inoperable until the
control box resets automatically.
Overheating protection – The table will become
inoperable if the overheating protection is triggered and
will return to operation automatically once the heat has
dissipated sufficiently.
Memory function – The control system (each column)
will retain information regarding the elevation of the
table at all times. This information will remain stored
even in case of power failure or if the power cable is
disconnected from the power outlet.
Soft start – Progressive acceleration allows for soft
starts and stops.
Speed – the speed of the table varies with load.
Tone Electric & Extended Electric - Stroke 665/420 User Manual 11
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