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