Hakko Electronics 475 User manual

®
Desoldering Tool
Instruction Manual

Thank you for purchasing the HAKKO 475 desoldering tool.
Please read this manual before operating the HAKKO 475.
Keep this manual readily accessible for reference.

Table of Contents
1. Packing List ................................................................ 1
2. Precautions ................................................................. 2
3. Part Names (Desoldering Gun) .............................. 3
(Station) ............................................. 4
4. Operation (Preparation-
Assembly and Connection) ......... 5 • 6
(Desoldering) ................................ 7 • 8
(Cleaning during Operation) .............. 9
(Problems during Desoldering)
(Post-operation Maintenance) ......... 10
(Troubleshooting Guide) ...................11
5. Maintenance (Desoldering Gun).....................12 ~ 14
(Station) .................................... 15 • 16
6. Replacement Parts
(Replacing Heating Element) .... 17 • 18
7. Parts List (Station) .................................... 19 • 20
(Desoldering Gun) ............................ 21
8. Specifications ........................................................... 22
9. Wiring ....................................................................... 22

2. Precautions
2
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 nozzle temperature is between
380°C/716°F and 480°C/ 896°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 nozzle, nearby plastic parts and the
spring iron holder.

Do not use the product near flammable items.

Advise other people in the work area that the unit can reach a very high tem-
perature 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.

This appliance is not intended for use by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction concerning
use of the appliance by a person responsible for their safety.

Children should be supervised to ensure that they do not play with the appli-
ance.
To prevent damage to the unit and ensure a safe working environ-
ment, be sure to comply with the following precautions.

Use clean, filtered air as the fluid. With the trigger pulled and air flowing,
adjust the pressure to between 490 to 686kPa(5.0 to 7.0kgf/cm2)

Do not use the unit for applications other than desoldering.

Do not rap the desoldering gun 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.

Set the ceramic paper filter (S) for the filter retainer (station), and the ceramic
paper filter (L) for the filter pipe (gun).

Maintain the desoldering gun and the station.

While using the unit, donʼt do anything which may cause bodily harm or physi-
cal damage.

3. Part Names
3
 Desoldering Gun
(Refer to p.19, 20 & 21 for part nos.)
Nozzle
Transmits heat for melting solder, En-
trance for melted solder.
Expendable part.
Heating Element
Inside requires cleaning.
Trigger
Squeeze to start absorption.
Do not pull the trigger before
fully heating the nozzle.
Filter Pipe
Set the ceramic paper filter (L) (No.A1033).
Contains melted solder and flux using filters.
Filters are expendable parts. Back Holder As-
sembly
Secures the filter
pipe.
Release Knob
Push down to remove
the filter pipe.
Indicator
Indicates when nozzle
and heating element
need cleaning and
when filters need
replacing.
(refer to p.9)
Hose
Connects to the vacuum outlet
cap (station).
Cord Assembly
Connects to the receptacle (station).

 Station
4
Temperature Control Knob
Provides nozzle temperature con-
trol. (refer to p.7)
Temperature Control Set
Screw Clamp
Prevents the temperature con-
trol knob from being reset.
(refer to p.7)
Vacuum Outlet Cap
Set the ceramic paper filter (S) (No.
A1009).
Connects with the hose. Filter inside
vacuum outlet cap is expendable.
Receptacle
Connector for the cord
assembly.
Power Lamp
Lights up when the
power switch is
turned to ON.
Power Switch
When turned to ON, the
heating element starts
to heat up.
CAL (Calibration)
Used for calibrating
the temperature after
replacing the heating
element.
Power Cord
Fuse Holder
• 100, 110V unit
contain 125V-2A fuse.
• 120V unit contains
250V-2A (U) fuse.
• 220, 230V unit contain
250V-1A fuse.
• Australian 240V unit
contains 250V-1A
S
fuse.
Female Connector
Supplier inlet compresser air
Tapered screw; PT 1/8

5
4. Operation
Tube(red)
Securely insert the
cleaning pin holder.
Preparation-Assembly and Connection
Assemble the HAKKO 474 on a flat surface.
1 Assemble the iron holder.
• Set the spring iron holder and
cleaning pin holder in the iron
holder base.
• Dampen the cleaning sponge
with water and then squeeze it
dry.
CAUTION
The sponge is compressed.
It will swell when moistened with
water.
Be sure to dampen the sponge with
water before use.
Be sure to remove the round portion
of the sponge.
2 Insert the desoldering
gun and cleaning pins.
• Fully insert the desoldering gun
into the spring iron holder.
CAUTION
The spring iron holder becomes
extremely hot during operation of
the desoldering gun. Do not touch
the spring iron holder during and
immediately after using the gun.
3 Connections
CAUTION
Be sure to turn off the power switch
before connecting or disconnecting
the cord assembly and the power
plug. Failure to do so may damage
the P.W.B.
• Connect the cord assembly to the
receptacle (marked “IRON”).
• Connect the hose to the vacuum
outlet cap (marked “VACUUM”).
Insert the cord
assembly by keying
the plug to the key
on the receptacle.
Secure the plug by
turning it clockwise.
Fully insert the hose
into the vacuum outlet
cap.
Spring Iron Holder
(No.B1094)
Cleaning Pin Holder
(No.B1095)
Iron Holder Base
Cleaning Sponge

5 Power switch
• Confirm that the power switch is
set in the OFF position, then con-
nect the power plug to the power
source.
CAUTION
The entire unit is constructed of con-
ductive materials. Always ground the
unit.
• Turn the power switch to ON.
The power lamp should light up.
• The nozzle begins to heat up
as soon as the power switch is
turned to ON.
6 After turning the power
switch to ON, wait 3
minutes before beginning
desoldering operations.
6
The power lamp doesnʼt light
up.
1. Is the power cord properly con-
nected?
2. Is the fuse blown?
The nozzle doesnʼt heat up.
1. Is the cord assembly properly
connected?
2. Is the heating element broken?
The power lamp
lights up.
The nozzle heats up.
CAUTION : The desoldering gun must be placed in the
iron holder when not in use.
4 Connect to the compresser.
• Use filtered air without any dust,
oil and moisture.
• With the trigger pulled and air
flowing, adjust the regulator air
pressure to 490kPa(5.0kgf/cm2).
The absorption power of the unit will
be reduced if adjustment is made
while air is not flowing or if the tube is
not measured as specified.
Do not set the regulator to pressure
of 882kPa (9kgf/cm2) or more while
the trigger is not pulled, as such
pressures can damage various parts
of the HAKKO 475 station.
CAUTION
Connections
Station
Male Connector:
pipe thread 1/8 Compressor
Regulator:
adjust to
490kPa
(5.0kgf/cm2)
Air Filter:
filter out dust,
oil and moisture.
Tubing:
must have a diameter of more
than ø0.17 in. and a length of
less than 9.5 ft.
CAUTION
Use the air filter. Dust, oil and
moisture can adhere to
the solenoid valve in the pipe
without it. This may result in
damage to the unit.

7
4. Operation
Desoldering
After turning the power switch to ON,
wait 3 minutes before begin-
ning desoldering operations.
1 Set the temperature.
CAUTION
Always set the temperature to as low
as possible for the work being done.
• To more precisely set the temper-
ature, measure the temperature
at the nozzle using a soldering
iron thermometer and adjust the
temperature control knob accord-
ingly.
We recommend the HAKKO FG-100
thermometer or HAKKO FG-101
soldering tester for measuring the
nozzle temperature.
• The temperature control knob
can be secured by tightening the
temperature control set screw
clamp (“+” screw) at the top of the
HAKKO 475 unit.
2 Clean the tip of the nozzle.
• Keep the solder-plated section
of the nozzle a shiny white by
coating it with a small amount of
solder.
If the tip of the nozzle is coated with
oxide, the nozzleʼs heat conductivity
will be lowered.
Coating the tip with a small amount
of fresh solder ensure maximum
heat conductivity.
Lock
Unlock
Secure the temperature
control set screw clamp
with a cross point screw-
driver.
Wipe away any oxide or old solder
from the nozzle using the hole in the
center of the sponge.
The temperature can be adjusted between 380°C (716°F)
and 480°C (896°F) with temperature control knob.
Please refer to the chart below, and adjust the tempera-
ture control knob.
knob
1 and 2
3 and 4
5 and 6
P.W.B.
Single-sided P.W.B.
Through-hole P.W.B.
Multilayer P.W.B.
CAUTION
Never insert the cleaning pin
in the hole of temp. control set
screw clamp.
As this may result in damage to
the unit.

8
3 Melt the solder.
• Apply the nozzle to the soldered
part and melt the solder.
CAUTION
Never allow the nozzle to touch the
board itself.
• Confirm that the solder is melted.
CAUTION
To confirm that all solder is melted,
observe the inside of the hole and
the backside of the P.W.B. If this is
difficult to do, try slowly moving the
lead with the nozzle – If the lead
moves, the solder is melted.
CAUTION
Never move the lead by force. If it
doesnʼt move easily, the solder isnʼt
yet fully melted.
4 Absorb the solder.
• After confirming that the solder
is completely melted, absorb the
solder by squeezing the trigger on
the gun.
CAUTION
Never leave any solder remaining
inside the hole in the P.W.B.
• After fully absorbing all the solder,
cool the soldering junction in
order to prevent it from becoming
resoldered.
5 Problems during
desoldering.
• If solder remains, resolder the
component and repeat the desol-
dering process.
Nozzle
P.W.B.
Solder
Lead
Slowly move
the lead with
the nozzle.
Absorb the solder by slowly
moving the lead back and
forth with the tip of the
nozzle.

9
4. Operation
Heated solder and flux can cause oxides to form and adhere to the nozzle
and the inside of the heating element. These oxides not only lower the
heat conductivity, but can also clog the nozzle and heating element, result-
ing in a drop in suction efficiency. Should there be a noticeable drop in
suction efficiency during operation, replace the filter and clean the nozzle
and heating element with the provided cleaning pin.
Cleaning during Operation
1 Observing the indicator
While looking at the indicator
and with the hole of the nozzle
open, pull the trigger and look
at the indicator. If it is red, clean
the nozzle and heating element,
empty the filter pipe, and replace
the filters. If the indicator is blue,
cleaning is not necessary and
operations can be resumed.
CAUTION
The indicator will not operate ac-
curately if the hole of the nozzle is
closed or if the solder in the hole of
the P.W.B. is not melted.
CAUTION
The indicator on the HAKKO 474
reads in a different way.
For instruction on the reading the
HAKKO 474 indicator, please refer to
the HAKKO 474 instruction manual.
2 Replacing the filter
Replace the filter as shown A to C.
During operation, the filter pipe is
very hot. Wait until the filter pipe
is cool before replacing the filter.
We recommend keeping a second
filter pipe containing new filters
handy, and replacing the installed
filter pipe with this backup filter
pipe.
A Replace the entire filter pipe
with he provided backup filter pipe. B Pull
C Down
Normal
One-half or
less of rthe
indicator is red.
Abnormal
Three-fourths
of the indicator
is red.
Solution
If three-fourths or more of
the indicator is red, replace
the filter and clean the
nozzle and the inside of
the heating element.
(refer to p.12 Maintenance
of the Desoldering Gun)
CAUTION : If there is a noticeable drop in suction
efficiency, clean the nozzle and heating ele-
ment with the cleaning pin.

10
Problems during Desoldering
A. The solder in the junction is
not sufficiently melted.
B. Suction power is dropping.
Post-operation Maintenance
To ensure a long service life, always
perform the following maintenance
procedures immediately after using
the HAKKO 475 unit.
A. The solder in the junction is not sufficiently melted.
 Temperature is not high enough
The following parts require a greater heat capacity to desol-
der.
• Multilayer P.W.B.s, power supplies, ground planes in
through-hole P.W.B.s, high-capacity transistors, triacs
with heat radiation fins, tuner P.W.B. ground wires, and
large-scale transformer terminals.
Use a preheating oven or heating gun to heat the P.W.B. to a
temperature that wonʼt damage the board or its components
[between 70°C (160°F) and 80°C (180°F)], then desolder. Do
not increase the temperature of the gun by recalibration as this
may damage the P.W.B. and its components.
 Nozzle is worn out.
• When the nozzle begins to wear out, the heating effi-
ciency begins to decline. Check the nozzle. If the solder
plating is damaged, or the nozzle is eroded, replace the
nozzle. (refer to p.12)
B. Suction power is dropping.
• Replace the filters, and clean the nozzle and the inside of
the heating element, (refer to p.12 to p.16, Maintenance
of Desoldering Gun and Station)
 Air is leaking from the vacuum system.
Air leakage cannot be determined from the indicator.
Check the air-tightness of the following parts and replace
any that are worn.
 Remove all solder from the inside of the nozzle and heat-
ing element.
 Clean the tip of the nozzle with the cleaning sponge,
then coat the tip with a fresh layer of solder to protect the
solder plating.
a. Contact point of the nozzle
and heating element
b. Front holder and nearby
parts
c. O-ring in the back holder
d. Hose
e. Vacuum outlet cap
f. Packing and nearby parts
 The air pressure is low.
Check the air pressure and connections. (refer to p.6)

WARNING : 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.
 Power lamp does not light up.
• Is the power cord plugged in correctly.
Securely insert the power cord into the power supply.
• Is the fuse blown?
Determine why the fuse blew and eliminate the cause,
then replace the fuse.
Example Is the inside of the gun short-circuited?
 Solder is not being absorbed.
• Is the spring filter full of solder?
Replace it with a new one. (refer to p.13)
• Is the ceramic filter hardened?
Replace it with a new one .
• Is there a vacuum leak?
Check the connections and replace any worn parts.
(refer to p.10)
• Is the compressor providing the proper air pressure?
Check the air pressure and the inside diameter and
length of the tube. (refer to p.6)
 The nozzle does not heat up.
• Is the desoldering gun cord assembly properly con-
nected?
Reconnect it. (refer to p.6)
• Is the heating element damaged?
Replace it. (refer to p.17)
NOTE : When repairs are needed, please send both the
desoldering gun and the station to your sales
agent.
11
Troubleshooting Guide

5. Maintenance
12
Properly maintained, the HAKKO 475 desoldering gun should provide years of good ser-
vice. Efficient desoldering depends upon the temperature, and the quality and quantity of the
solder and flux. Perform the following service procedures as dictated by the conditions of the
gunʼs usage.
WARNING :
Since the desoldering gun can reach a very high temperature, please work carefully.
Except when cleaning the nozzle and heating element, always turn the power switch
off and disconnect the power plug before performing any maintenance procedure.
CAUTION
The desoldering gun will be extremely
hot. During maintenance, please wear
gloves and work carefully.
1 Inspect and clean the
nozzle.
• Plug in the power cord, turn the
power switch On and let the
nozzle heat up.
• Clean out the hole of the nozzle
with the nozzle cleaning pin.
CAUTION
The cleaning pin will not pass
through the nozzle until the solder in-
side the nozzle is completely melted.
• If the cleaning pin does not pass
through the hole in the nozzle,
clean with the cleaning drill.
• Check the condition of the solder
plating on the tip of the nozzle.
• If it is slightly worn, recoat the tip
with fresh solder to prevent oxida-
tion.
• Check the condition of the surface
and inside hole of the nozzle.
• If either is worn or eroded, or the
inside diameter seems unusually
wide, replace the nozzle.
CAUTION
The inside hole and the surface of
the nozzle is plated with a special
alloy.
Should this alloy become eroded by
high-temperature solder, the nozzle
will not be able to maintain the
proper temperature.
Cleaning with the nozzle cleaning pin
Cleaning with the cleaning drill
• Before cleaning
• After cleaning
Solder plating
Diameter of hole is
widened through
erosion.
(Desoldering Gun)
The cleaning pin passes com-
pletely through the hole.
Insert the bit while turning it clockwise.
Pull the drill bit out straight without turning it.
CAUTION
If the cleaning drill is forced into
the nozzle, the drill bit could break
or be damaged.
CAUTION
Please use the proper size clean-
ing pin or cleaning drill for the
nozzle diameter.
CAUTION
Unfortunately, it is often difficult to
observe this condition. Therefore,
if desoldering efficiency goes
down and all other parts appear
to be OK, the nozzle is probably
eroded and should be replaced.
Servicing the Desoldering Gun

13
2 Disassemble the heating
element.
CAUTION
The heating element is very hot dur-
ing operation.
3 Clean out the hole in the
heating element with the
provided cleaning pin.
CAUTION
Be sure the solder in the hole in
the heating element is completely
heated, before cleaning the hole.
• If the cleaning pin cannot pass
through the hole, replace the
heating element.
• Turn the power off after cleaning.
4 Replace the filters.
• Turn the power switch OFF,
• When the filter pipe is cool to the
touch, push down the release
knob at the back of the gun and
remove the filter pipe.
CAUTION
The filter pipe is very hot.
• Examine the front holder.
• Examine the spring filter.
• Examine the ceramic paper filter
(L). (No.A1033)
Heating Element Element Cover
Nozzle Nut
Remove the nut with the attached wrench.
Scrape away all oxidation from the hole in the heating element until the
cleaning pin passes cleanly through the hole.
The cleaning pin passes cleanly
and completely through the hole.
Front Holder
Spring Filter Ceramic Paper
Filter (L)
(No.A1033)
Replace
Stiff and cracked.
Replace
Solder is collected in two-thirds of the spring filter.
Replace
Ceramic paper filter is stiff with flux and solder.

14
5 Secure the filters.
• Attach the spring filter to the front
holder
• Attach the front holder to the filter
pipe.
CAUTION
Be sure the front holder is correctly
aligned.
CAUTION
Use the ceramic paper filter (L) for
the filter pipe (gun). Using of the ce-
ramic paper filter (S) in the filter pipe
may cause to break or the power to
drop.
6 Assemble the heating
element.
• Attach the nozzle and securely
tighten the nut with the attached
wrench.
CAUTION
If the nut is loose, air will leak and
the temperature will drop.
Ceramic Paper
Filter (L)
(No.A1033)
Attach the front holder to the filter pipe
so that it does not leak air.
Firmly press the back holder assembly
into the filter pipe in order to properly
seat the O-ring against the pipe.

15
5. Maintenance (Station)
1 Replace the ceramic
paper filter (No.A1009).
Remove the ceramic paper filter
and inspect it. If it is stiff with flux,
replace it.
2 Reassemble the filter
case.
CAUTION
Set the ceramic paper filter (S) for
the filter retainer (station).
Using the ceramic paper filter (L) in
the filter retainer may cause to break
or the power to drop.
VACUUM
Ceramic Paper
Filter (S)
(No.A1009)
Filter Retainer
Remove the filter retainer
and push out the ceramic
paper filter.
Ceramic Paper
Filter (S)
(No.A1009)
Cover
Rear Panel
Remove
the screws
Remove
the cover screws.
(right/left)
Secure the vacuum outlet cap.
Apply silicone grease to the O-ring (S20) and securely
tighten the vacuum outlet cap to prevent air leakage.
Exhaust Filter Replacement
WARNING
Unplug the power cord before start-
ing this procedure.
1 Disassemble the unit.
• Remove the rear panel.
• Remove the cover.
Please make sure to remove piping
of the compressed air before you
start cleaning. If you clean the ejector
with the pressured air pipe still
connected, the compressed air may
cause the nozzle and exhaust pipe to
suddenly fly off when the ejector
cover is removed.
CAUTION
Cleaning the inside of the Filter Case

16
Exhaust filter
Clean the tip of the
inner nozzle and the
surrounding area.
• Remove the exhaust filter which
covers the ejector.
Replace it if it is dirty.
• Remove the ejector cover.
If the noise filter (No.B1269)
inside the cover is very dirty,
replace it.
• Remove the exhaust pipe
and spacer from inside the
ejector.
*Pinch the tip of the exhaust pipe
and pull dirmly.It can be removed
together with the spacer.
Ejector
Exhaust pipe
Spacer
Noise filter
Ejector cover
2 Clean the inside.
CAUTION
Do not use thinner as a cleaning
agent.
• Clean the inside of the ejector,
the tip of the nozzle and the
surrounding area. Remove any
dirt with a cotton swab soaked in
alcohol.
• Soak the exhaust pipe in alcohol
and clean the inside of the pipe
with a soft stick-like material.
3 Reassemble in reverse
order.
• Inside of the ejector
• Inside of the ejector
Clean the inside with
a stick-like material.

17
6. Replacement Parts
Replacing the Heating
Element
WARNING
Unplug the power cord before start-
ing this procedure.
The resistance value of a working
heating element is 2-4Ω 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 remove the heating
element.
Housing
Remove the filter pipe.
Unscrew the screws.
Detach
the terminal.
Glass Tube

18
4 Insert a new heating
element and reassemble.
(Heating element 24V-50W)
CAUTION
Before reassembling enclosure,
make sure connectors are complete-
ly covered by the glass tube.
5 Recalibrate the tempera-
ture.
The resistance of new heating
element varies, resulting in varia-
tions in operating temperatures.
It is necessary to recalibrate the
temperature every time the heat-
ing element is replaced.
• Set the temperature control knob
to 1 and allow the gun to warm up
for 3 minutes.
• Using a tip thermometer, ad-
just the temperature calibrator
(marked “CAL”) until the nozzle
temperature reads at 380°C (716°
F).
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.
High
Low
Adjust the temperature calibra-
tor (CAL) with a straight-edge (–)
screwdriver.
Bend the lead
before inserting it.

Item No.
14
15
16
17
18
19
20
21
22
23
16
32

19
10
31
9


1
2
3
5
4
6
7
8
13
30
15
11
12
24
23
18
17
14
16
20
28
21
19
22
11
12
28
26
27
29
25
Item No.
1
2
3
4
5
6
7
8
9
10
11
12
13
7. Parts List
Note: Spare or repair parts do not include mounting screws, if they are not listed on the description.
19
(Station)
Part No.
B1029
A1009
B1063
B1034
B1031
B1064
B2069
B1038
B1036
B1028
B1093
B1061
B1044
Part Name
Vacuum outlet cap
Ceramic paper filter (S)
Filter retainer
O-ring (S20)
Vacuum outlet retainer
Filter case joint
Front panel
Cover for securing screw
Receptacle
Knob
Cover
Handle
Temp. control set screw clamp
Specifications
10 pcs.
With o-ring (S20)
Set of 4
One side
One side
Part No.
B1073
B2071
B1069
B1070
B1071
B1074
B1075
B1076
B1072
B1103
B1136
B1137
B2330
B1067
Part Name
Joint hose
P.W.B.
Ejector
Exhaust filter
Exhaust filter retaining clip
Solenoid valve
Elbow joint
Pressure hose
Transformer
Transformer
Transformer
Transformer
Transformer
Chassis
Specifications
With potentiometer
100-24V
120-24V
110-24V
220-24,230-24,240-24V
230-24V (CE)
External
Tooth Lock Washer
nominal size 4
Pan Head Screw
with Washer
M3×6
Pan Head Screw
with Washer
M4×8
Pan Head Screw
with Washer
M4×8
Pan Head Screw
with Washer
M3×6(2)
Pan Head Screw
with Washer
M4×8
Plain Washer
nominal size
4 (4)
Pan Head Screw
M5×10(4)
Internal Tooth Lock Washer
nominal size 4 (2)
Truss Screw (Zn, black)
M4 x 5 (2)