Remove all solder from the inside of the nozzle and
heating 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.
Problems during Desoldering
Post-operation Maintenance
To ensure a long service life, always
perform the following maintenance
procedures immediately after using
the Hakko 470B unit.
10
A. The solder in the junction
is not sufficiently melted.
B. Suction power is dropping.
A. The solder in the junction is not sufficiently melted.
Temperature is not high enough.
Nozzle is worn out.
The following parts require a greater heat capacity to
desolder.
·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 won't damage the board or its compo-
nents [between 70˚C(160˚F) and 80˚C(180˚F)], then desol-
der. Do not increase the temperature of the gun by recalibra-
tion as this may damage the P.W.B. and its components.
·When the nozzle begins to wear out, the heating efficiency
begins to decline. Check the nozzle. If the solder plating
is damaged, or the nozzle is eroded, replace the nozzle.
(refer to p.12)
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.
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
B. Suction power is dropping.
·Replace the filters, and clean the nozzle and the inside
of the heating element. (refer to p.12~16, Maintenance
of Desoldering Gun and Station )
