11. TROUBLE SHOOTING GUIDE
WARNING:
• Before checking the inside of the Hakko 941 or replacing parts, be sure to disconnect the
power plug. Failure to do so may result in electric shock.
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The unit does not
operate when the power
switch is turned on.
CHECK
: Is the power cord and/or the connection plug dis-
connected?
ACTION
: Connect it.
CHECK
: Is the fuse blown?
ACTION
: Investigate why the fuse blew and then replace the fuse. If
the cause can not be determined, replace the fuse. If the
fuse blows again, send the unit in for repair.
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The tip does not heat up.
• The sensor error
is
displayed.
CHECK
: Is the power cord and/or the connection plug dis-
connected?
ACTION
: Connect it.
CHECK
: Is the tip inserted properly?
ACTION
: Insert the tip completely.
CHECK
: Is the connection cord and/or the heater/sensor broken?
ACTION
: See the appropriate section of this manual regarding how
to check the connection cord and/or the heater/sensor for
breakage.
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Solder does not wet the
tip.
CHECK
: Is the tip temperature too high?
ACTION
: Set the appropriate temperature.
CHECK
: Is the tip contaminated with oxide?
ACTION
: Remove the oxide (see “Tip maintenance” on P. 12).
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The tip temperature is
too high.
CHECK
: Is the connection cord broken?
ACTION
: See “Checking the connection cord for breakage” on
P. 13.
CHECK
: Is the entered offset value correct?
ACTION
: Enter the correct value.
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The tip temperature is
too low.
CHECK
: Is the tip contaminated with oxide?
ACTION
: Remove the oxide (see “Tip maintenance” on P. 12).
CHECK
: Is the entered offset value correct?
ACTION
: Enter the correct value.
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The low-temperature
alarm tolerance error
occurs frequently.
CHECK
: Is the tip too small for the items to be soldered?
ACTION
: Use a tip with a larger thermal capacity.
CHECK
: Is the setting value for the low-temperature alarm
tolerance too low?
ACTION
: Increase the setting value.
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