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Post-operation Maintenance
To ensure a long service life, always per-
form the following maintenance procedures
immediately after using the HAKKO 474
unit.
Troubleshooting Guide
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)
l 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
n Remove all solder from the inside of the nozzle and heating element.
n 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.
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.
l 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?
l Pump does not operate.
• Is the cord assembly properly connected?
Reconnect the cord assembly. (refer to p.4)
• Is the nozzle or hole in the heating element clogged?
Clean it. (refer to p.9)
l Solder is not being absorbed.
• Is the spring filter full of solder?
Replace it with a new one. (refer to p.10)
• 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.8)
l The nozzle does not heat up.
• Is the desoldering gun cord assembly properly connected?
Reconnect it. (refer to p.4)
• Is the heating element damaged?
Replace it. (refer to p.12)
NOTE : When repairs are needed, please send both the desoldering gun
and the station to your sales agent.
c. O-ring in the back holder
d. Hose
e. Vacuum outlet cap
f. Packing and nearby parts
8
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