Hakko 900M, 900L, 907, 908, 913 User Manual

No.A1321

No.A1321(900M • 900L • 907 • 908 • 913 • 914 • 951 • 952 )

Replacing the Heating Element

■ 900M/L ■ 907/908/913/914 ■ 951/952

Nut

Tip Enclosure Tip

Glass Tube

Grounding Spring Heating Element

1

Checking the heating element

Heating Element Leads (Red)

Sleeve

Terminal Board Handle

1. Remove the nut, tip enclosure, tip and nipple.

CAUTION Be sure to remove the nut before removing the

nipple. Removing the nipple first could cause the
heater leads to twist and cause a short-circuit.

2. Push the cord asse’y in the direction of the tip and
remove the terminal board from the handle. For 900M­ESD/900L-ESD, move the terminal tube if it is covered
with the tube.

3. Remove the grounding spring from the sleeve.

4. Measure the resistance values at the sensor and heating
element of the terminal board in normal condition.

Resistance value of heating element (red) 2.5–3.5Ω
Resistance value of sensor (blue) 43–58Ω

If the value you get is outside this range, replace the heating element.
If the resistance value is normal, the cord asse’y may be broken.

Resistance Value
of Heating Element

2

Replacing the heating element

Resistance Value
of Sensor

Sensor Leads (Blue)

1. Desolder the heating element leads and sensor leads.

2. Remove the old heating element and replace it with a new
one.

3. Bend the leads at right angle.

4. Pass the leads through the terminal, push the lead down
inside the terminal board, then solder it. Be sure that the
insulation covering the lead is long enough to leave NO

exposed wire. Cut the wire to leave no more than 1 to
2mm from the solder joint. Move the tube back to its
original position for ESD safe type.

• Solder in the joints must be visible from both sides of

the terminal board.

• There is no polarity between leads of the same colors.

64mm (2.52in)

Bend at right angle.

Straighten the tube.

3

Inspection after replacement

and reassemble

After replacing the heating element,

1. Measure the resistance value between pins 4 & 1 and 4 &
2, and pins 5 & 1 and 5 & 2. If it is not infinite, the
heating element and sensor are touching.

2. Measure the resistance value ‘a’, ‘b’, and ‘c’ to confirm
that the leads are not twisted and that the
grounding spring is properly connected.

a

Between pins 4 & 5 (Heating Element) 2.5 - 3.5Ω (Normal)

b

Between pins 1 & 2 (Sensor) 43 - 58Ω (Normal)

c

Between pin 3 & Tip

4

Recalibrate the temperature

To ensure accurate soldering temperatures, always calibrate the temperature after replacing the heating element.
Connect your iron/gun to the station for calibration.

For HAKKO 926 • 928 • 936 • 700 • 701• 702 • 702B

1. Set the temperature control knob to 400°C (750°F).

2. Turn the power switch on and wait until the L.E.D. heater
lamp comes on and off.

3. Using a straight-edge (–) or small cross point
screwdriver, adjust the temperature calibrator (marked
“CAL”) so that the tip temperature is 400°C (750°F).

* Turn the temperature calibrator clockwise to increase the temperature and counterclockwise to reduce the temperature.
* Using the supplied hex wrench, remove the screw (M4×5mm) labeled “CAL” on the bottom of the station, and then turn the power on (HAKKO 927).
* Remove the CAL pot plug before calibrating HAKKO 936/937.
* We recommend the HAKKO 191/192 thermometer for measuring the tip temperature.

Under 2Ω

Nipple

4

5

Red

Heating
element
lead

3

Nut Tip Enclosure Tip

Sleeve

Heating Element Glass Tube Terminal Board

*HAKKO 913 and 914 are different from HAKKO 907 and 908 in shape of the handle.

1

Checking the heating element

Nipple Grounding Spring

Handle

1. Remove the nut, tip enclosure, tip and nipple.

CAUTION Be sure to remove the nut before removing the

nipple. Removing the nipple first could cause the
heater leads to twist and cause a short-circuit.

2. Push the cord asse’y in the direction of the tip and
remove the terminal board from the handle.

3. Remove the grounding spring from the sleeve.

4. Measure the resistance values at the sensor and heating
element of the terminal board in normal condition.

Resistance value of heating element (red)
Resistance value of sensor (blue) 43–58Ω

If the value you get is outside this range, replace the heating element.
If the resistance value is normal, the cord asse’y may be broken.

Resistance Value
of Heating Element

2

Replacing the heating element

2.5–3.5Ω

Resistance Value
of Sensor

Heating Element Leads (Red)

1. Desolder the heating element leads and sensor leads.

2. Remove the old heating element and replace it with a new
one.

3. Bend the leads at right angle.

4. Pass the leads through the terminal, push the lead down
inside the terminal board, then solder it. Be sure that the
insulation covering the lead is long enough to leave NO
exposed wire. Cut the wire to leave no more than 1 to
2mm from the solder joint.

• Solder in the joints must be visible from both sides of

the terminal board.

• There is no polarity between leads of the same colors.

64mm (2.52in)

Straighten the tube.

3

Inspection after replacement

Bend at right angle.

and reassemble

After replacing the heating element,

1. Measure the resistance value between pins 4 & 1 and 4 &
2, and pins 5 & 1 and 5 & 2. If it is not infinite, the
heating element and sensor are touching.

2. Measure the resistance value ‘a’, ‘b’, and ‘c’ to confirm
that the leads are not twisted and that the
grounding spring is properly connected.

a

Between pins 4 & 5 (Heating Element) 2.5 - 3.5Ω (Normal)

b

2

1

Between pins 1 & 2 (Sensor) 43 - 58Ω (Normal)

c

Between pin 3 & Tip

Under 2Ω

For HAKKO 927 • 937

1. Turn the power switch on and insert the card. Set the
temperature to 400°C (750°F).

2. Wait until the digital display indicates a tip temperature of
400°C (750°F).

3. Using a straight-edge (–) or small cross point screw­driver, adjust the temperature calibrator (marked “CAL”)
so that the tip temperature is 400°C (750°F).

Support Fitting

1

Checking the heating element

1. Remove the adjusting screw and keep the support fitting
apart from the housing.

CAUTION Be sure to remove the nut before removing the

2. Remove the four screws
securing the housing
and open the housing.

3. Remove the grounding
spring from the sleeve.

4. Measure the resistance
values at the sensor and heating element of the
terminal board in normal condition.

Resistance value of heating element (red)
Resistance value of sensor (blue) 43–58Ω

If the value you get is outside this range, replace the heating element.
If the resistance value is normal, the cord asse’y may be broken.

2

Replacing the heating element

1. Desolder the heating element leads and sensor leads.

2. Remove the old heating element and replace it with a new
one.

3. Bend the leads at right angle.

4. Pass the leads through the terminal, push the lead down
inside the terminal
board, then solder it. Be
sure that the insulation
covering the lead is long
enough to leave NO exposed
wire. Cut the wire to leave
no more than 1 to 2mm

Red

from the solder joint.

• Solder in the joints must

be visible from both sides
of the terminal board.

Heating
element
lead

• There is no polarity between leads of the same colors.

Inspection after replacement

3

and reassemble

After replacing the heating element,

1. Measure the resistance value between pins 4 & 1 and 4 &
2, and pins 5 & 1 and 5 & 2. If it is not infinite, the
heating element and sensor are touching.

2. Measure the resistance value ‘a’, ‘b’, and ‘c’ to confirm
that the leads are not twisted and that the
grounding spring is properly connected.

a

Between pins 4 & 5 (Heating Element) 2.5 - 3.5Ω (Normal)

b

3

4

5

2

1

Between pins 1 & 2 (Sensor) 43 - 58Ω (Normal)

c

Between pin 3 & Tip

CAUTION

When reassembling, match the
convex part of the hexagon nut to
concave part of the housing.

NOTE When repairs are needed, please send both the soldering iron and

the station to your sales agent.
* Specifications subject to change without notice.

®

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4 2 5 5 6

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TEL: [phone] FAX: [phone]

Grounding

Spring

Adjusting
Screw

nipple. Removing the nipple first could cause the
heater leads to twist and cause a short-circuit.

Resistance
Value of
Sensor

2.5–3.5Ω

Bend at right angle.

Heating
element lead

Under 2Ω

Hexagon nut M4

INDONESIA: P.T. HAKKO PRODUCTSTAMA INDONESIA.
TEL: [phone] FAX: [phone]

P.T. HAKKO PRODUCTSTAMA INDONESIA

TEL: [phone] FAX: [phone]

HONG KONG: HAKKO DEVELOPMENT CO., LTD.

TEL: [phone] FAX: [phone]
http://www.hakko.com.hk/

CHINA: HAKKO DEVELOPMENT CO., LTD.

TEL: [phone] FAX: [phone]

TAIWAN: HAKKO DEVELOPMENT CO., LTD.

TEL: [phone] FAX: [phone]

Tip

Tip Enclosure

Resistance
Value of
Heating Element

64mm
(2.52in)

4

5

Nut

3

2

1

Sep. 2001