Hakko Electronics 937 User manual

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SOLDERING STATION
Instruction Manual
●
Thank you for purchasing the HAKKO 937 soldering station.
Please read this manual before operating the HAKKO 937.
Keep this manual readily accessible for reference.
●
CAUTION
When seeking tip replacements, select only “Hakko” genuine soldering iron tips
that are intended for your particular model of soldering iron (Please refer to the
instruction manual). If an incompatible tip or a tip made by another manufacturer
is used, the original performance of the soldering iron may not be obtained.
Furthermore, the heating element, P.W.B. and transformer may be damaged.
TABLE OF CONTENTS
1. PACKING LIST ...........................................................................1
2. SPECIFICATIONS ......................................................................1
3. WARNINGS AND CAUTIONS ....................................................2
4. PART NAMES.............................................................................3
5. SETTING UP & OPERATING THE HAKKO 937........................3
6. PARAMETERS ...........................................................................6
7. CALIBRATION OF IRON TEMPERATURE ................................7
8. CALIBRATION CHART ..............................................................8
9. TIP CARE AND USE ..................................................................9
10. MAINTENANCE .........................................................................9
11. TIP STYLES..............................................................................10
12. ERROR MESSAGES ................................................................11
13. TROUBLESHOOTING GUIDE..................................................12
14.
CHECKING FOR BREAKAGE OF THE HEATING ELEMENT AND CORD ASSEMBLY. 14
15. PARTS LIST (Station/Iron Holder)............................................16
(Iron)....................................................................17
16. WIRING DIAGRAM ...................................................................18

1
Card
Coupling Band
1. PACKING LIST Please check the contents of the HAKKO 937 package and
confirm that all the items listed below are included.
HAKKO 937 Station ................................................1
Card ........................................................................1
Soldering Iron (HAKKO 900 (S), 907 or 908) .........1
HAKKO Iron Holder (With Cleaning Sponge) .........1
Coupling Band ........................................................1
Instruction Manual ..................................................1
Cleaning sponge
Iron holder
Iron/907, 908
Iron/900 (S)
Station
900S-ESD
24V AC-50W
Under 2 Ω
Under 2 mV
Ceramic heater
1.2 m (4 ft.)
176 mm
(7 in.)
25 g
(0.06 lbs.)
908-ESD
200 mm
(7.9 in.)
54 g
(0.12 lbs.)
907-ESD
190 mm
(7.5 in.)
44 g
(0.09 lbs.)
2. SPECIFICATIONS
Name
Power Consumption HAKKO 937 60W
Part Name
Output Voltage
Temperature Range
Dimensions
Weight (W/O Cord)
937 Station ESD
24V AC
200~480°C/400~899°F
120 (W) ×93 (H) ×140 (D)mm
(4.7 ×3.7 ×5.5 in.)
1,300 g (2.9 lbs.)
Power Consumption
Tip to Ground Resistance
Tip to Ground Potential
Heating Element
Cord Assembly
Total Length (w/o Cord)
Weight (w/o Cord)
●Soldering Iron●Station
• The tip temperature was measured using HAKKO 191 thermometer.
• Specifications and design are subject to change without notice.

2
3. WARNINGS AND CAUTIONS
In this instruction manual, “WARNING” and “CAUTIONS” are defined as follows.
WARNING
WARNING: Misuse may potentially cause death of, or serious injury to, the user.
CAUTION : Misuse may potentially cause injury to the user or physical damage
to the objects involved.
For your own safety, be sure to comply with these precautions.
CAUTION
When the power is on, the tip temperature is between
200°C/400°F and 480°C/ 899°F.
Since mishandling may lead to burns or fire, be sure to comply with
the following precautions.
●Do not touch the metallic parts near the Tip.
●Do not use the product near flammable items.
●Advise other people in the work area that the unit can reach a very high
temperature and should be considered potentially dangerous.
●Turn the power off while taking breaks and when finished using the unit.
●Before replacing parts or storing the unit, turn the power off and allow the unit
to cool to room temperature.
To prevent damage to the unit and ensure a safe working
environment, be sure to comply with the following precautions.
●Do not use the unit for applications other than soldering.
●Do not rap the soldering iron against the work bench to shake off residual
solder, or otherwise subject the iron to severe shocks.
●Do not modify the unit.
●Use only genuine HAKKO replacement parts.
●Do not wet the unit or use the unit when your hands are wet.
●Do not bend or damage the card. Should the card become bent, do not force
the card into the station.
●The soldering process will produce smoke, so make sure the area is well
ventilated.
●While using the unit, don’t do anything which may cause bodily harm or
physical damage.

3
4. PART NAMES
Iron receptacle
Large cleaning
sponge
Small cleaning
sponge
Cord assembly
Iron holder base
Membrane sheet
Power switch
CAL pot plug/calibrator
Card
5. SETTING UP & OPERATING THE HAKKO 937
CAUTION : The sponge is compressed. It will swell when moistened with water.
Before using the unit, dampen the sponge with the water and squeeze it dry.
Failure to do so may result in damage to the soldering tip.
A.Iron holder
1. Small cleaning sponge
Dampen the small cleaning sponge
with water and then squeeze it dry.
Place it in one of the 4 openings
of the iron holder base.
2. Add water to approximately the
level as shown. The small sponge
will absorb water to keep the larger
sponge above it wet at all times.
*The large sponge may be used alone
(w/o small sponge & water).
3. Dampen the large cleaning sponge
and place it on the iron holder base.
Note: The iron receptacles for the 900
(S) and the 907/908 soldering
irons are different. Be sure to use
the proper one for each type of
soldering iron. (Refer to Parts List).

4
Heater lamp
B.Connections
1. Connect the cord assembly to
the receptacle.
2. Place the soldering iron in the
iron holder.
3. Plug the power cord into the
power supply. Be sure to ground
the unit.
4. Turn the power switch to ON.
NOTE:
The temperature is preset at 400°C
at the factory. (The No.937-4, -5,
and -6, are preset at 750°F.) The
heater lamp will flicker when the
temperature has stabilized.
5. Press to display the preset
temperature. It will be displayed
for two seconds.
CAUTION : Be sure to turn off the power switch before connecting or disconnecting the
soldering iron. Failure to do so may damage to the Station.
Receptacle
Align the grooves and pins.
And push straight in.
Turn clockwise
firmly.
CAUTION
Be sure to insert the correct end of the card into the card slot.
While setting the temperature, the heating element is off.
Press or
Insert the card
Press once
C.Set the temperature
Example: Change the temperature from
400°C to 350°C.
1. Insert the card into the card slot on
the front panel of the station. The
left-most digit in the display (the
100’s digit) will begin flashing,
indicating that the station is in the
temperature setting mode and that
the 100’s digit can be adjusted.
2. Using the or button to
increase or decrease the value,
select the desired value for the 100’s
digit. The 100’s digit can be set to 2,
3, or 4. Press when the desired
value is displayed. This will cause
the middle digit (the 10’s digit) in the
display to begin flashing.
CAUTION
The soldering iron must be placed
in the iron holder when not in use.

Press or
Press once
Press once
5
5. SETTING UP & OPERATING THE HAKKO 937
3. Again using the or
button, select the desired value
for the 10’s digit. The 10’s digit
can be set to 1, 2, 3, 4, 5, 6, 7, 8,
9, or 0. Press when the
desired value is displayed. This
will cause the digit on the right
(the 1’s digit) in the display to
begin flashing.
4. Again using the or
button, select the desired value
for the 1’s digit. The 1’s digit can
be set to 1, 2, 3, 4, 5, 6, 7, 8, 9, or
0. Press when the desired
value is displayed. This will store
the temperature setting in
memory, display the temperature
setting, and initiate heater
control.
1. Press and hold it down for at least one second.
The current temperature setting will be displayed for a
moment, then the 100’s digit will begin flashing,
indicating that the station is now in the temperature
setting mode. Proceed with the procedure on page
4&5.
2. If is pressed for less than one second, the present
temperature setting will be displayed for two seconds,
then the display will again show the tip temperature.
1. After setting the temperature, remove the card. The
preset temperature cannot be changed until the card
is reinserted, even if the power switch is turned off.
Thus, the power can be turned off and on without
having to reset the temperature each time, and
accurate and safe temperature control is assured.
2. Any HAKKO 937 card can be used with any HAKKO
937 station.
3. The HAKKO 937 will operate normally with a card inserted.
If the power is turned off while the card is inserted, when
the power is turned on again, the previously set
temperature will be used to heat up the soldering iron.
For greater convenience and soldering efficiency, two
stations can be securely stacked.
NOTE:
If the power switch is turned off during any step of the
temperature adjustment procedure, the setting will not be
stored in memory.
C.Setting or changing the
temperature (continued)
To change the temperature
setting when the card has been
left in the station...
The card
Stacking stations

6. PARAMETERS
The HAKKO 937 has three user-adjustable or viewable
parameters: a) Temperature display mode (Centigrade or
Fahrenheit), b) Heater-error temperature tolerance, and
c) Room temperature compensation value (test mode).
Once parameter-input mode is entered, these
parameters are set in the order shown. Once all three
parameters have been set, normal operation is resumed.
1. Turn off the power switch.
2. Press and hold the and buttons
simultaneously, and turn on the power switch.
3. Continue holding down the and buttons until
the display indicates either (for Centigrade) of
(for Fahrenheit). The station is now in
parameter input mode.
4. Press either the or button to alternately
display and .
5. When the desired method is displayed, press .
The heater-error temperature will now be displayed
and the left-most digit (100’s digit) in the display will
begin flashing.
The heater-error temperature tolerance parameter is
entered in the same manner as used to set the
temperature. (see pg. 4, 5, steps 2-4.)
Be sure to use a value within the allowable range. (see
chart at left). If a value outside this range is selected, the
display will again flash the 100’s digit. Should this occur,
re-enter a correct value.
After setting the heater-error temperature tolerance, the
display will show the room temperature compensation
value (test mode).
This is the measured temperature of the soldering iron
tip. It is used to calibrate the tip temperature. (see pg. 7,
Calibration of iron temperature)
No inputs are made here. The display will not blink nor
will the heater receive power. Press to complete
parameter input. The soldering temperature setting will
be displayed for two seconds, then power will be
supplied to the heater and normal temperature control
will begin.
Heater-error temperature range
Centigrade: 30 - 150°C
Fahrenheit: 60 - 300°F
6
Parameter input mode
1. Centigrade or Fahrenheit
temperature display
2. Heater-error temperature
tolerance
(see Heater error on page 11)
3. Room temperature
compensation value
(test mode)

7. CALIBRATION OF IRON TEMPERATURE
Calibration is required whenever the soldering iron, or its heating element or tip have
been replaced. Although either of the two following calibration methods can be used,
calibration with a tip thermometer is more accurate.
Calibration with a tip
thermometer 1. Set the temperature to 400°C (750°F).
2. When the temperature stabilizes, remove the CAL pot
plug.
3. Using a regular or small cross point screwdriver, turn
the screw marked CAL on the front panel of the
station until the tip thermometer indicates a
temperature of 400°C (750°F).
Note: Turn the screw clockwise to increase the temperature
and counterclockwise to reduce the temperature.
4. Reattach the CAL pot plug.
1. Allow the HAKKO 937 to cool to room temperature.
(approx. 1 hour)
2. Press and hold down the and buttons
simultaneously, and turn the power switch on. (see
Parameters on pg. 6)
3. Following the procedure on page 6, display the room
temperature compensation value (test mode). This is
the measured temperature of the soldering iron tip.
CAUTION
If a mistake is made while performing steps 2 or 3, the
station will start up normally and the heating element will
begin warming up. Should this happen, turn the station off
and wait until it has again cooled to room temperature.
4. Using a regular or small cross point screwdriver, turn
the screw marked CAL on the front panel of the
station until the display indicates the room
temperature plus or minus the value in the calibration
chart on page 8.
5. Press to complete the calibration.
Power will now be supplied to the heater and normal
temperature control will begin.
7
Calibration with a room
thermometer (test mode)
We recommend the HAKKO 191
thermometers and HAKKO 192
soldering tester for measuring the tip
temperature.

8
8. CALIBRATION CHART
Example: To calibrate the 900M-T-LB tip at a room temperature of 22°C (70°F), adjust the CAL
potentiometer until the digital display reads 20 (66).
Room temperature:........... 22°C (70°F)
Compensation value:........ -2°C (-4°F)
Digital display: .................. 20°C (66°F)
900STip No.
900S-T-1.2D
900S-T-1.6D
900S-T-2C
900S-T-1C
900S-T-B
900S-T-I
Compensation value
0
0
0
0
0
0
907 Tip No.
900M-T-0.8D
900M-T-1.2D
900M-T-1.6D
900M-T-2.4D
900M-T-3.2D
900M-T-1.2LD
900M-T-SB
900M-T-B
900M-T-LB
900M-0.5C
900M-0.8C
900M-T-1C
900M-T-1CF*
900M-T-1.5CF*
900M-T-2C
900M-T-2CF*
900M-T-3C
900M-T-3CF*
900M-T-4C
900M-T-4CF*
900M-T-K
900M-T-R
900M-T-RT
900M-T-SI
900M-T-I
900M-T-H
900M-T-1.8H
900M-T-S4
Compensation value
0
+2°C (+4°F)
0
0
0
0
0
0
-2°C (-4°F)
0
-2°C (-4°F)
0
0
0
0
0
0
0
0
0
+7°C (+12°F)
0
0
0
-2°C (-4°F)
-5°C (-9°F)
-2°C (-4°F)
+4°C (+7°F)
908 Tip No.
900L-T-B
900L-T-2B
900L-T-2.4D
900L-T-3.2D
900L-T-2C
900L-T-2CF*
900L-T-3C
900L-T-3CF*
900L-T-4C
900L-T-4CF*
900L-T-5C
900L-T-5CF*
900L-T-I
900L-T-K
Compensation value
0
0
0
0
-5°C (-9°F)
-5°C (-9°F)
0
0
0
0
0
0
-5°C (-9°F)
+5°C (+9°F)

9
9. TIP CARE AND USE
Tip temperature
Cleaning
When not in use
After use
High soldering temperatures can degrade the tip. Use the lowest
possible soldering temperature. The excellent thermal recovery
characteristics ensure efficient and effective soldering even at low
temperatures. Low temperatures also protect the soldered items
from thermal damage.
Clean the tip regularly with a cleaning sponge, as oxides and
carbides from the solder and flux can from impurities on the tip.
These impurities can result in defective joints, of reduce the tip’s
heat conductivity.
When using the soldering iron continuously, be sure to loosen the
tip and remove any oxide at least once a week. This helps prevent
seizure and reduction of the tip temperature.
Never leave the soldering iron sitting at a high temperature for
long periods, as the tip’s solder plating will become covered with
oxide, which can greatly reduce the tip’s heat conductivity.
Wipe the tip clean and coat it with fresh solder.
This helps prevent tip oxidation.
10. MAINTENANCE
Inspect and clean the
tip 1. Set the temperature to 250°C (482°F)
2. When the temperature stabilizes, clean the tip with the cleaning
sponge and check the condition of the tip.
3. If there is black oxide on the solder-plated portion of the tip,
apply new flux-contained solder and wipe the tip on the
cleaning sponge. Repeat until the oxide is completely removed.
Coat with new solder.
CAUTION
Never file the tip to remove oxide.
4. If the tip is deformed or heavily eroded, replace it with a new
one.

10
11. TIP STYLES
907
908
900S
3
900M-T-1.6D
5
900M-T-2.4D
6.5
900M-T-3.2D
900M-T-B
900M-T-0.8D
900M-T-1.2D
900M-T-1.2LD
900M-T-SB
900M-T-LB
900M-T-1C
900M-T-1CF*
60¡
900M-T-2C
900M-T-2CF*
45¡
900M-T-3C
900M-T-3CF*
45¡
900M-T-4C
900M-T-4CF*
45¡
900M-T-0.5C
45¡
900M-T-0.8C
45¡
900M-T-1.5CF*
60¡
900M-T-K
45¡
2
900M-T-RT
2
900M-T-R
900M-T-I
900M-T-H
25¡
900M-T-1.8H
25¡
900M-T-S4
900M-T-SI
900L-T-B
900L-T-2B
900L-T-2.4D
5
900L-T-3.2D
900L-T-2C
900L-T-2CF*
45¡
900L-T-3C
900L-T-3CF*
45¡
900L-T-4C
900L-T-4CF*
45¡
900L-T-5C
900L-T-5CF*
45¡
900L-T-I
900L-T-K
45¡
900S-T-1.2D
900S-T-1.6D 900S-T-2C
45¡
900S-T-1C
60¡
900S-T-B
900S-T-I
17(0.66)
(0.031) ¿0.8
0.6(0.024)
17(0.66)
(0.047) ¿1.2
0.7(0.028)
17(0.66)
(0.1)
(0.06) ¿1.6
0.5(0.02)
17(0.66)
(0.2)
(0.09) ¿2.4
0.5(0.02)
17(0.66)
(0.25)
(0.12) ¿3.2
0.5(0.02)
25(0.98)
(0.047) ¿1.2
0.7(0.028)
14(0.55)
R0.2(0.008)
(0.08) ¿2
17(0.66)
R0.5(0.02)
25(0.98)
R0.2(0.008)
15(0.6)
(0.02) ¿0.5
17(0.66)
(0.031) ¿0.8
15(0.6)
(0.04) ¿1
15(0.6)
(0.06) ¿1.5
17(0.66)
(0.08) ¿2
17(0.66)
(0.1) ¿3
(0.1) ¿3
17(0.66)
(0.16) ¿4
(0.16) ¿4
15(0.6)
(0.2) ¿5
2(0.08)
17(0.66)
(0.08)
(0.2) ¿5.1
(0.1) 3.2
17(0.66)
(0.08)
(0.17) ¿4.2
(0.08)
2
13(0.51)
R0.2(0.008)
17(0.66)
R0.2(0.008)
19(0.74)
(0.29)
7.5
1.2(0.04)
3.5(0.13)
14(0.5)
(0.29)
7.5
1(0.04)
1.8(0.07)
15(0.6)
R0.25(0.01)
(0.08) ¿2
20(0.8)
R0.5(0.02)
20(0.8)
R1(0.04)
20(0.8)
(0.09) ¿2.4
(0.2)
0.5(0.02)
20(0.8)
(0.12) ¿3.2
8(0.3)
0.5(0.02)
20(0.8)
(0.08) ¿2
20(0.8)
(0.1) ¿3
20(0.8)
(0.15) ¿4
15(0.6)
(0.2) ¿5
20(0.8)
R0.2(0.008)
18(0.7)
(0.2) ¿5
2(0.08)
0.4(0.016) 17(0.66)
(0.047) ¿1.2
0.5(0.02) 17(0.66)
(0.06) ¿1.6
15(0.6)
(0.04) ¿1
17(0.66)
(0.08) ¿2
17(0.66)
R0.5(0.02)
17(0.66)
R0.2(0.008)
0.5(0.02)
1(0.04)
900M-T-S10*
17 (0.66)
55¡
900M-T-S11*
17 (0.66)
55¡
(0.04)
1
*900M tip Out Diam ø6.5
*900L tip Out Diam ø8.5
*These tips are tinned flat only.
*900S tip Out Diam ø5.8
For heavy duty soldering HAKKO recommends the 908 iron with heavier tips.
For micro soldering HAKKO recommends the 900S iron with fine tips.

11
12. ERROR MESSAGES
The HAKKO 937 displays various error messages whenever there is a problem. If the
following messages are displayed, refer to the Troubleshooting Guide on page 12.
System error When the power is turned on, the system automatically
checks its memory and the stored programmed. If a
problem is found, the unit will display and all
operations will come to a complete stop.
If there is a possibility of a failure of the sensor or any
part of the sensor circuit, will be displayed and
power to the soldering iron will be cut off.
If power is being sent to the soldering iron and the tip
temperature goes below the heater-error temperature
tolerance setting, the temperature display will begin
flashing on and off. This indicates a possible heater
malfunction.
For example, assume that the temperature setting is
400°C (750°F) and the heater-error temperature
tolerance value is 50°C (100°F). If the temperature of the
soldering iron goes below 350°C (650°F), even though
the heater is receiving power, the display will begin
flashing, indicating a possible heater malfunction.
Example: 400 - 50 = 350°C (750 - 100 = 650°F)
The display begins flashing.
Note: If the temperature begins to rise again, the
display will stop flashing, even if the
displayed temperature is below 350°C
(650°F).
Sensor error
Heater error

13. TROUBLESHOOTING GUIDE
12
Problem
The unit does not operate.
The tip does not heat up. Sensor
error or heater error is displayed.
The tip heats up intermittently.
Solder will not wet the tip.
Check
•Is the fuse blown?
Determine why the fuse blew and eliminate the
cause, then replace the fuse.
-Is the inside of the iron short-circuited?
-Is the grounding spring touching the heating
element?
-Is the heating element lead twisted and short-
circuited?
•Is the power cord broken?
Replace it with a new cord.
•Is the power cord and/or connecting plug
disconnected?
Connect it.
•Is the soldering iron cord broken?
See Check for a broken heating element or cord
assembly, pg. 14.
•Is the heating element broken?
See Check for a broken heating element or cord
assembly, pg. 14.
•Is the soldering iron cord broken?
See Check for a broken heating element or cord
assembly, pg. 14.
•Is the tip temperature too high?
Set an appropriate temperature.
•Is the tip coated with oxide?
Clean the tip. (See Tip care and use, pg. 9.)
WARNING : *Disconnect the power plug before servicing.
Failure to do so may result in electric shock.
*If the power cord is damaged, it must be replaced by the manufacturer, its
service agent or similarity qualified person in order to avoid personal injury or
damage to the unit.

13
13. TROUBLESHOOTING GUIDE
The tip temperature is too low.
Heater errors are frequently
displayed
•Is the tip coated with oxide?
Clean the tip. (See Tip care and use, pg. 9.)
•Is the iron calibrated correctly?
Recalibrate. (see Tip care and use, pg. 9.)
Contact your nearest HAKKO representative.
•Is the tip too small for the items to be soldered?
Use a heavier tip.
•Is the heater-error temperature tolerance setting
too low?
Increase the value of the setting.

14
14. CHECKING FOR BREAKAGE OF THE HEATING ELEMENT AND CORD ASSEMBLY
Disconnect the plug and measure
the resistance value between the
connecting plug pins as follows.
If the values of ‘a’ and ‘b’ are outside
the above value, replace the heating
element (sensor) and/or cord
assembly. Refer to Procedures 1
and 2.
If the value of ‘c’ is over the above
value, remove the oxidization film by
lightly rubbing with sand-paper or
steel wool the points shown below.
1. Broken Heating Element Disassembling the 907/908
1. Turn the nut (1) counterclockwise
and remove the tip enclosure (2),
the tip (3).
2. Turn the nipple (4)
counterclockwise and remove it
from the iron.
3. Pull both the heating element (6)
and the cord assembly (11) out
of the handle (12). (Toward the tip
of the iron).
4. Pull the grounding spring (5) out
of the sleeve.
Heating Element (Red) Sensor (Blue)
Measure when the heating element is at room temperature.
1. Resistance value of heating element (RED) 2.5 - 3.5 Ω
2. Resistance value of sensor (BLUE) 43- 58 Ω
If the resistance value is not normal, replace the heating
element.
(Refer to the instructions included with the replacement part.)
After replacing the eating Element,
1. Measure the resistance value between 1) pins 4 & 1
or 2 ) pins 5 & 1 or 2. If it is not ∞, the heating
element and sensor are touching. This will damage
the P.W.B.
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.
Between pins 4&5 (Heating Element)
Between pins 1&2 (Sensor)
Between pin 3&Tip
a
b
c
2.5 - 3.5 Ω(Normal)
43 - 58 Ω(Normal)
Under 2 Ω

15
Disassembling the 900S
1. Slide the handle cover (2) toward the cord and
remove the screw (1) securing the heating element.
2. Turn the nut (3) counterclockwise and remove it.
3. Remove the tip (4).
4. Pull both the heating element (5) and the cord toward
the tip of the iron and out of the handle (6).
Measure the resistance values at the sensor and the
heating element of the terminal board.
The resistance value should be the same as for the 907,
908.
To replace the heating element, refer to the instructions
included with the replacement part.
1. Turn the unit ON and set the temperature to 480°C
(899°F). Then wiggle and kink the iron cord at various
locations along its length, including in the strain relief
area. If the LED heater lamp flickers, then the cord
needs to be replaced.
2. Check the resistance between the pin of the plug and
the wire on the terminal.
Pin 1: Red Pin 2: Blue Pin 3: Green Pin 4: White
Pin 5: Black
The value should be 0 Ω. If it is greater than 0 Ωor is
∞, the cord should be replaced.
Refer to the drawing in the replacement parts section of
this manual. Desolder the blown fuse and remove it.
Solder on a new one.
2. Broken Soldering Iron
Cord
There are two methods of testing
the soldering iron cord.
3. Replacing the Fuse
CAUTION
The heater lamp will flicker if the iron
temperature is allowed to reach the
set temperature. Before replacing the
cord, be sure that this is not the
reason for the flickering.
14. CHECKING FOR BREAKAGE OF THE HEATING ELEMENT AND CORD ASSEMBLY
Be sure to use only genuine HAKKO
replacement Parts!

15. PARTS LIST
16
12
10
14
16
13
11
15
8
9
7
5
6
3
2
4
1
2
1
34
Item No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Part Name
Upper Case
P.W.B. for temp. control
P.W.B. for temp. control
Panel
Receptacle
Card
CAL Pot Plug
Membrane sheet
Grounding Plate
Transformer
Transformer
Transformer
Transformer
Transformer
Lower Case
Cord Stopper
Power switch
Fuse/2A
Fuse/2A
Fuse/0.8A
Rubber Stopper
Power Cord
Power Cord
Power Cord
Power Cord
Wiring Board for Switch
Specifications
E.S.D.
Australia
100-24V
110-24V
120-24V (UL)
220-240-24V
240-24V (Australia)
E.S.D., with rubber stopper
100, 110V
120V (UL)
220-240V
set of 2
3 core but no plug
3 core & American plug
3 core & Australian plug
3 core & European plug
Part No.
B2034
B2036
B2322
B2035
B2006
B2037
B2018
B2047
B2227
B2038
B2039
B2040
B2041
B2302
B2002
B2015
B1084
B2007
B2224
B2008
B2016
B1318
B1319
B2042
B2043
B2103
Item No.
1
2
3
4
Part No.
C1141
C1142
B2020
B2021
B2019
A1042
Part Name
Iron Holder
Iron Holder
Iron Receptacle
Iron Receptacle
Iron Holder Base
Cleaning Sponge
For
900S
907, 908
900S
907, 908
900S, 907, 908
900S, 907, 908
Station
Iron holder
Binding Head Tapping Screw
M3.5 ×45 (4)
Tapping Screw
M2.6 ×8 (1)
Tapping Screw
M3 ×12 (1)
Tapping Screw
M4 ×12 (4)

10
11
8
9
7
5
6
3
2
4
1
4
6
5
3
2
1
17
15. PARTS LIST(Iron)
900S
Item No.
1
2
3
4
5
6
7
8
Part No.
900S-006S
A1322
900S-101
900S-001S
900S-034S
900S-010
900S-039S
Part Name
Nut
Soldering Tip
Heating Element
Terminal Board
Handle
Handle Cover
Cord Bushing
Cord Asse’y
Specifications
E.S.D.
See P.10
Old part No.900S-H
w/Cord Stopper
w/Handle Cover, E.S.D.
E.S.D.
E.S.D.
907, 908 907, 908
For
907
908
907
908
907
908
907
908
907, 908
Specifications
See page 10
See page 10
Part Name
Nut
Nut
Tip Enclosure
Tip Enclosure
Soldering Tip
Soldering Tip
Nipple
Nipple
Grounding Spring
Part No.
B1784
B1794
B1786
B1787
B2022
B2033
B2032
Item No.
1
2
3
4
5
For
907, 908
907, 908
907
908
907, 908
907, 908
907, 908
Specifications
Old part No.900M-H
900L-H
w/Handle Cover, E.S.D
w/Handle Cover, E.S.D.
E.S.D.
Part Name
Heating Element
Terminal Board
Handle
Handle
Handle Cover
Cord Bushing
Cord Asse’y
Part No.
A1321
B2028
B2024
B2026
B2027
B2031
B2030
Item No.
6
7
8
9
10
11

18
16. WIRING DIAGRAM
Control P.W.B. Transformer
Ground
Power switch
Switching P.W.B.
BLKWHT
WHT
BLK RED

2004. 2
MA00110JN040219
19
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