Problem Solution And Measures - Brother KE-430HX Service Manual

14-5-2. Problem solution and measures

Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the control box cover. Touching areas where high voltages are present will result in serious injury
from electric shocks.
1. Pay attention to the following when opening the control box for maintenance.
Electrical 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 electrical 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.
Injury
When separating or rejoining connectors, and measuring something, be careful not to cut your fingers on metal parts such
as heat sinks and covers.
2. When replacing a fuse, be sure to use a new one of the same quality and capacity as the old one.
Before adjustment
1. While the power is turned off, check each connector is securely plugged in by referring to "14-4. Connectors".
2. Find the error status number in the troubleshooting flowchart.
3. From the applicable part of the flowchart, take the reference number to find the correspondingly numbered details of the
problem in the following table.
DANGER
KE-430HX/KE-430HS, BE-438HX/BE-438HS
14. ELECTRIC MECHANISM
196