HAKO 474, Instruction Manual

Page: 13 / 32

12
7. Replacement Parts
Replacing the Heating Element
WARNING
Unplug the power cord before starting this
procedure.
The resistance value of a working
heating element is 2-4
Ω
at 23°C (73°
F). If the value you get is outside this
range, replace the heating element.
1. Disassemble the heating
parts.
2. Separate the housing.
3. Detach the terminal and re-
move the heating element.
4. Insert a new heating ele-
ment and reassemble.
(Heating element 24V-50W)
CAUTION
Before reassembling enclosure, make
sure connectors are completely cov-
ered by the glass tube.
5. Recalibrate the tempera-
ture.
The resistance of new heating ele-
ment varies, resulting in variations
in operating temperatures. It is nec-
essary to recalibrate the tempera-
ture every time the heating element
is replaced.
• Set the temperature control knob to
1 and allow the gun to warm up for
3 minutes.
• Using a tip thermometer, adjust
the temperature calibrator (marked
“CAL”) until the nozzle temperature
reads at 380°C (716°F).
Housing
Remove the filter pipe.
Unscrew the screws.
Detach
the terminal.
Glass Tube
Cover the glass tube on the
connecting part.
Push in.
Position the leads in groove and
press them into place.
Be careful that the leads do not
get caught in the housing.
Bend the lead
before inserting it.
High
Low
Adjust the temperature calibra-
tor (CAL) with a straight-edge (–)
screwdriver.
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