JUKI LK-1900AN Engineer's Manual page 8

2. In prevention of accident caused by unfamiliarity with the machine or electrical-shock accident, be sure
to ask an electrical technician of your company or JUKI or distributor in your area for disassembly/as-
sembly of electrical components.
3. When it is necessary to open the control box containing electrical parts, be sure to turn the power off
and wait for five minutes or more before opening the cover in order to prevent accident caused by unfa-
miliarity with the machine or electrical-shock accident. In addition, do not carry out disassembly/assem-
bly work with wet hands in order to prevent electrical-shock accident.
4. Be sure to carry out replacement work after having installed the machine in a stable state in order to
protect against accident that can result in personal injury.
In addition, be sure to select appropriate tools.
5. In prevention of accident that can result in personal injury, be sure to tighten screws and nuts in assem-
bly work with a specified torque, if specified, or with an appropriate torque, if not specified.
After the completion of assembly work, be sure to check that screws and nuts are not loosened before
starting test run.
6. In prevention of accident that can result in personal injury, make sure, after the completion of adjust-
ment work, that neither screws nor nuts are loosened or come in contact with other parts.
7. Make sure, after the completion of replacement work, that neither connectors nor cables are damaged,
slipped off or loosened in order to protect against accident that can result in personal injury.
It should be remembered that some parts have been factory-insulated with tubes or tapes, or floated
above the PWB for safety's sake. In addition, internal wiring has been factory-routed or -clamped in
such a way that it does not come close to high-voltage parts. Be sure to re-place those parts as they are
at the time of delivery.
8. In prevention of accident that can result in personal injury, be sure to check whether the direction of
rotation is correct at the time of test run.
9. In prevention of accident that can result in personal injury or entanglement accident, be sure to ensure
safety at the time of test run. In addition, be sure to take care not to allow hair or cloths to come in con-
tact with the machine belt.
Precautions to be taken so as to use the LK-1900AN Series more safely
1. To avoid electrical shock hazards, neither open the cover of the electrical box for the motor
nor touch the components mounted inside the electrical box.
2. After changing the pattern, make sure the needle entry point. If the pattern is protruded
from the work clamp feet, the needle will interfere with the work clamp feet during sewing,
and it is dangerous due to the needle breakage or the like.
3. Do not turn OFF the power in a state that the needle is lowered. Wiper may break the nee-
dle.
1. In case nothing is displayed in the operation panel even when the power switch is turned
ON, turn OFF the power switch and check the power voltage and phase.
2. To prevent personal injury or death, never put fingers into the thread take-up lever, work
clamp, work clamp mechanism and thread take-up cover, and under or near the cloth cut-
ting knife and needle when turning on the power switch or while the machine is in opera-
tion.
3. To protect against possible accidents due to abrupt startup of the machine, turn OFF the
power switch before tilting the machine head or removing the motor cover.
4. So as to prevent possible accidents caused by abrupt start of the sewing machine, depress
the start switch after ascertaining that there is no interfering thing under the needle when
winding the bobbin thread. In addition, never put your hair close to the machine during
thread trimming.
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