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Electric Mechanism; Precautions At The Time Of Adjustment - Brother HE-800B Service Manual

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Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the face plate of the control box. Touching areas where high voltages are present will result in
serious injury from electric shocks.

9-1. Precautions at the time of adjustment

Pay attention to the following when opening the control box for maintenance.
Electric shock
Some large capacitors may have a high voltage remaining in them for up to 5 minutes after the power is turned off. To prevent
electric shock, wait at least 5 minutes after the power is turned off before doing the following:
• Opening and closing the control box
• Replacing fuses
• Separating and joining connectors
• Measuring resistance
• Doing anything with a possibility of touching something inside the control box
Some adjustments require measuring the voltage while the power is turned on with the control box kept open.
In such a case, be careful not to touch any place other than that for the measurement. In addition, always keep in mind that a
high voltage remains for about 5 minutes after power is turned off.
When separating or rejoining connectors, and measuring something, be careful not to cut your fingers on metal parts such as
heat sinks and covers.


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