Hakko Electronics 941 User manual

TABLE OF CONTENTS
1. PACKING LIST ................................................................ 1
2. SPECIFICATIONS........................................................... 1
3. WARNINGS, CAUTIONS, NOTES AND EXAMPLES ...... 2
4. PART NAMES ................................................................. 3
5. INITIAL SETUP ............................................................... 3
6. OPERATION ................................................................... 5
7. ENTERING TIP OFFSET VALUES ................................. 8
8. PARAMETER SETTINGS ............................................. 10
9. MAINTENANCE ............................................................ 12
10. ERROR MESSAGES .................................................... 14
11. TROUBLE SHOOTING GUIDE ..................................... 15
12. PARTS LIST .................................................................. 16
13. TIP STYLES .................................................................. 18
14. WIRING DIAGRAM ....................................................... 19
®
High-output, temperature controlled
compact soldering station
Instruction Manual
●
Thank you for purchasing the Hakko 941 soldering station.
This high-output, temperature controlled compact soldering
station uses a composite tip, incorporating heater and sensor
functions into one element. Several process control features,
unique to the Hakko 941, make it applicable to a broad range
of soldering applications.
Please read this manual before operating the Hakko 941. Keep
this manual readily accessible for reference.
●

1
Heat resistant pad
Iron holder
Tip tray
Hakko 911
Soldering iron
Hakko 941
Soldering station
Power cord
Control
card
Card chain
1. PACKING LIST
Hakko 941 soldering station ........................... 1
Hakko 911 soldering iron................................ 1
Power cord ..................................................... 1
Control card .................................................... 1
Heat resistant pad .......................................... 1
Iron holder ...................................................... 1
Tip tray ........................................................... 1
Cleaning sponge ............................................ 1
Instruction manual .......................................... 1
Card chain ...................................................... 1
Tips (not included)
2. SPECIFICATIONS
Power consumption
Temperature range
Temperature stability
50 W. total
200
˚
– 450
˚
C. (400
˚
– 840
˚
F. )
±2.5
˚
C. (±5
˚
F.) at idle temperature
See Figure 1.
•
Hakko 941 soldering station
Power consumption
Tip to ground resistance
Tip to ground potential
Length, less cord
Weight, less cord
Length of cord
45 W. (15 V.)
< 2 W
< 2 mV.
172 mm. (6.8 in.) with 2.4D tip
30 g. (0.067 lb./1.07 oz.)
with 2.4D tip
1.2 m. (4 ft.)
•
Hakko 911 soldering iron
Output
Dimensions
(l × w × h)
Weight
15 V., 3 A.
145 × 85 × 108 mm.
(5.7 × 3.3 × 4.3 in.)
1,300 g. (2.9 lb.)
•
Station
Set temperature
Stability: ±2.5
˚
C. (±5
˚
F).
Temperature
Time
Figure 1. Temperature stability
NOTE:
The temperatures were measured using the Hakko 191
thermometer.
This product is protected against electrostatic discharge.
Specifications and design are subject to change without notice.

3. WARNINGS, CAUTIONS, NOTES AND EXAMPLES
Warnings, cautions and notes are placed at critical points in this manual to direct the
operator’s attention to significant items. They are defined as follows:
WARNING: Failure to comply with a WARNING may result in serious injury or
death.
CAUTION: Failure to comply with a CAUTION may result in injury to the
operator, or damage to the items involved. Two examples are given
below.
NOTE: A NOTE indicates a procedure or point that is important to the process being
described.
EXAMPLE: An EXAMPLE is given to demonstrate a particular procedure, point or
process.
2
CAUTION
When power is ON, tip temperatures will be between 200° and 450°C. (392° to 840°F.)
To avoid injury or damage to personnel and items in the work area, observe the
following:
●Do not touch the tip or the metal parts near the tip.
●Do not allow the tip to come close to, or touch, flammable materials.
●Inform others in the area that the unit is hot and should not be touched.
●Turn the power off when not in use, or left unattended.
●Turn the power off when changing parts or storing the Hakko 941.
CAUTION
To prevent accidents or damage to the Hakko 941, be sure to observe the following:
●Do not use the Hakko 941 for applications other than soldering.
●Do not allow the Hakko 941 to become wet, or use it when hands are wet.
●Do not modify the Hakko 941.
●Use only genuine Hakko replacement parts.
●Do not bend or damage the control card. If the card does become damaged, do not force the
card into the station slot.
●Do not strike the iron against hard objects to remove excess solder. This will damage the
iron.
●Remove power and iron cords by holding the plug – not the wires.
●Be sure the work area is well ventilated. Soldering produces smoke.
●The Hakko 941 is not intended for use by children or infirm persons without supervision.
●Children should be supervised to ensure that they do not play with the Hakko 941.
Note: The model Hakko 941 station is not available for sale or use in the United States.

1
4. PART NAMES
5. INITIAL SETUP
A. Iron holder
1. Adjust the height of the iron holder to suit, as
follows:
i. Loosen the adjusting screws.
ii. Set the iron holder to the desired height.
iii. Tighten the screws.
Heat resistant pad
Iron holder
Cleaning
sponge
Tip (not included) Hakko 911
Soldering iron
Power cord
Fuse
Power receptacle
Station
Power switch
Receptacle
Control card
Card chain
OFFON
Tip tray
3

NOTE:
Be sure the cleaning sponge is kept CLEAN and DAMP.
A dirty sponge will transfer contaminants to the soldering
tip, reducing thermal efficiency and possibly causing
defective solder joints. A dry sponge will abrade the
soldering tip, reducing its life.
3
2
4
B. Handpiece
1. Insert the tip fully into the handpiece (Hakko
911).
There are no orientation requirements.
2. Pass the iron cord through the hole in the
heat resistant pad.
1
2
4
2. Put the small cleaning sponge in one of the
four holes in the iron holder base.
3. Add water to the level shown in the ac-
companying illustration. The small sponge
will keep the large sponge moist through
capillary action.
4. Wet the large cleaning sponge, squeeze it
dry, and put it on the iron holder base.
Procedure 2-4 – OR –
Wet the large cleaning sponge, squeeze it
dry, and put it on the iron holder base.
5. Place the spare tips in the tip tray.
C. Soldering station
1. Insert the power cord into the receptacle at
the back of the station.
Insert the soldering iron cord into the
receptacle at the front of the station.
2. Set the iron in the iron holder.
3. Plug the power cord into a grounded wall
socket. The Hakko 941 is protected against
electrostatic discharge and must be
grounded for full efficiency.
To remove the cord,
draw the plug from
the receptacle while
pressing the release pin.
Receptacle
When the plug ‘clicks’,
it is fully inserted.
CAUTION:
Be sure the power switch is OFF before connecting or
disconnecting the soldering iron cord. Failure to do so
may result in damage to the circuit board.

6. OPERATION
Controls and displays
Controls
UP
DOWN
The front panel of the Hakko 941 soldering
station has the following controls:
• A power on/off switch.
• Four control buttons:
– Initiates a data entry mode.
– End of sequence signal (terminates a
phase of a data entry mode); when
pressed for less than one second,
displays settings already stored.
– increases the value in the appropriate
display window.
– decreases the value in the appropriate
display window.
Displays
The Hakko 941 has a three-digit display
element. Depending upon the selected mode, it
will display:
• Normal mode:
Sensor temperature (tip temperature)
• Data entry:
Selected quantity (see ‘data entry procedures’
for exact characteristics)
• Temperature scale:
°C or °F, depending upon selection
• Error detection:
Refer to ‘ERROR MESSAGES’ section
In addition, a single heater lamp will flash when
the station has reached the desired temperature,
indicating that it is ready for use.
An audible buzzer is provided to alert the
operator when:
• The station has reached the set temperature.
The buzzer will sound once.
• The low temperature threshold has been
crossed. This buzzer will shutoff when the
sensed temperature returns to the acceptable
range.
• A failure has occurred in the sensor or heater
(including the sensor circuit). The buzzer will
sound continuously.
• The auto power shutoff is activated and the
power to the heating element is shutoff, the
buzzer will sound three times.
1. Turn the power switch ON.
2. Once the temperature is reached, the buzzer
sounds. The heater lamp at the lower right of
the temperature display starts
blinking.
3. If the offset value is not 0°C./0°F., enter the
tip offset value following the instructions on
page 8.
Heater lamp
UP
DOWN
CAUTION:
Place the iron in the iron holder when not in use.
CAUTION:
The Hakko 941 is preset at 350°C. at the factory.
Check the temperature setting by pressing the
button.
The set temperature will be displayed for two seconds.
5

●●
●●
●Factory settings
The Hakko 941 comes from the factory with the
following values preset:
Temperature scale
Auto power shutoff
Low temperature alarm setting
Resetting the supervisor/
operator control setting
Set temperature
Celsius
disabled
150
˚
C.
4 0
350
˚
C.
6
●●
●●
●Control card Each Hakko 941 comes with a small card, which
inserts in the control slot in the front of the unit.
This card is used when entering data for the
process control functions. Any Hakko 941 card
can be used with any Hakko 941 soldering
station.
Using the control card
The control card is used when a value is to be
changed or data are to be entered. The Hakko
941 will operate normally with the card inserted.
If power is turned on with the card inserted, the
station will heat to the temperature set before
the card was inserted.
●●
●●
●Changing the temperature
setting
Example: 350° to 400°
1. Insert the control card into the slot in the
front of the unit.
• The hundreds digit will begin to flash,
indicating that the unit is in the TEM-
PERATURE SET mode and data may be
entered.
2. Entering the hundreds digit
• Press the or button to set the
desired figure. Only 2, 3, or 4 can be
selected. (In °F mode, 4, 5, 6, 7, or 8 can
be selected).
When the desired figure is displayed,
press the button to enter. The tens digit
will begin to flash.
CAUTION:
The card must be inserted into the card slot in the correct
direction. The heater is off while you are setting the tem-
perature.
Press the button once.
Insert the card.
Press the or button.

NOTE:
If power is switched off or lost during the execution of this
procedure, no data will be entered. The entire procedure
must be repeated from step 1.
Press the button once.
Press the button once.
Press the or button.
When the station is ON and the
card is in the station, the data entry
procedure follows:
a. Hold the button down for at least one
second.
b. The current temperature setting will be
displayed, then the hundreds digit will begin to
flash. This indicates that the station has
entered the temperature setting mode.
c. Continue with the procedure of 1-4, above.
NOTE:
When the button is pressed for less than one second,
the current temperature setting is displayed.
●●
●●
●Replacing the tip
a. Always turn the power OFF when removing
or inserting a tip.
b. Hold the tip with the heat resistant pad and
pull it out.
c. Insert the new tip fully into the Hakko 911. If
the tip is not fully inserted, the display will
show a sensor error when power is
turned on.
CAUTION:
The tip will be HOT! Use the heat resistant pad to remove
it. Do not hold the tip with the heat resistant pad for an
extended time.
7
3. Entering the tens digit
• Press the or button to set the
desired figure. Any value from 0 to 9 can
be selected. When the desired figure is
displayed, press the button to enter.
The units digit will begin to flash.
4. Entering the units digit
• Press the or button to set the
desired figure. When the desired figure is
displayed, press the button to enter.
The desired temperature is now entered
into the system memory and heater control
will begin.

7. ENTERING TIP OFFSET VALUES
Soldering tips have different thermal characteristics, depending upon their mass, shape, and surface
area. It is obvious that the tip temperature at idle will not be the same for a fine tip as it will be for a
heavy chisel tip, although the set temperature may be the same for each tip. The difference between
the set temperature and the temperature measured at the tip is called ‘Tip Temperature Offset’. Each
Hakko 941 tip style has a specified offset value, which may be entered into the station to either add to
or subtract from the set value, thus producing the desired tip temperature. Please refer to the tip styles
and offset values on the separate sheet.
The Hakko 941 has the ability to electronically compensate for the variations due to tip temperature
offset. When a soldering tip is changed, the proper offset temperature value should be programmed
into the 941.
There are two methods for programming this function:
Method 1: Using the manufacturer’s predetermined offset value.
Method 2: Using a tip temperature thermometer to measure the actual tip temperature.
8
1. Insert the control card into the slot in the
station.
• The station will default to the temperature
setting mode. Set the temperature at
400°C. (750°F.).
2. Press the button on the front panel
and hold for one second.
• The station will sequence to the tip temper-
ature offset data entry mode, and the
hundreds digit will blink 0 or –.
3. Entering the hundreds digit
• Refer to the Tip Styles and Offset Values
on the separate sheet. The offset value is
indicated below the tip part number.
Record this value for reference.
• Press the or buttons to select
either positive (0 is displayed) or negative
(– is displayed) sign for the offset to be
entered.
• Press the button. The tens digit will
flash, indicating that the value can be
changed (data may be entered).
4. Entering the tens digit
• Press the or button to enter the
tens place digit of the offset value being
entered. If the value displayed is correct,
go to the next step.
●●
●●
●Method 1. How to enter the tip offset value into the Hakko 941
(Example) When the offset value is –10°C.
Press the button for at least one second.
Insert the card and
set the temperature at 400˚C.
Press the or button.
Press the or button.
Press the button once.

9
• Press the button. The units digit will
flash, indicating that the value can be
changed (data may be entered).
5. Entering the unit digit
• Press the or button to enter the
units place digit of the offset value being
entered. Press the button.The tip offset
data are entered into memory, the station
switches to normal operation, and temper-
ature will be controlled using the entered
value.
NOTE:
The allowable ranges for offset values are: –50° to
+50°C.; –90° to +90°F. If a value outside these ranges is
entered, the hundreds digit will blink, indicating that the
system has reverted to the beginning of the mode and
the procedure must be repeated from the beginning.
1. Insert the control card into the slot in the
station.
• The station will default to the temperature
setting mode. Set the temperature at
400°C. (750°F.).
2. Press the button on the front panel
and hold for one second.
• This will set the station to the data entry
mode. The existing offset will be displayed.
3. Measure the tip temperature.
4. Enter the offset value
• Determine the difference, if any, between
400°C. (750°F.) and the measured tip
temperature. Record this value. See the
example following to determine what value
to enter as the offset for that particular tip.
• Enter the actual offset value into system
memory by following the procedure given
for Method 1, above.
●●
●●
●Method 2. How to enter the tip offset value into the Hakko 941
This method requires measuring the tip temperatures with a tip thermometer and is recommended
for the most accurate process control.
Press the button once.
Press the button once.
NOTE:
Allow the tip temperature to become stable. During offset
data entry mode, the tip temperature is controlled using
an offset value of 0. The flashing value displayed is not
meaningful.
EXAMPLE:
If the measured temperature is 395°C. (740°F.), the
difference between the set temperature is +5°C. (+10°F.)
(the tip is five (ten) degrees too cool) and the offset is
thus +5°C. (+10°F.). If the measured temperature is
405°C./760°F., the difference between the set temper-
ature is –5°C. (–10°F.) (the tip is five (ten) degrees too
hot) and the offset is –5°C. (–10°F.).