Nelson ALPHA 850 - 9 Repairs; 9.1 Notes on repair

9 Repairs Page 48
Stud welding unit operating manual Date: July 2021
ALPHA 850 07.2021 / EN Rev.: A
9 Repairs
9.1 Notes on repair
Defective components and cleaning tasks inside the ALPHA 850 require the welding
device to be dismantled. Observe the following instructions:
Warning:
• Before repair work starts, the welding device must be switched
off, unplugged and secured against restart!
• Only authorized electro-technical personnel
+)
are allowed to open
the welding device or work inside its housing.
+) Technical personnel in the field of electrical repair, preferably familiar with welding, cutting and
related processes (see EN 60974-4)
• Repairs to the ALPHA 850 welding device are to be done only as part of
maintenance.
• The ALPHA 850 can be repaired with ordinary commercial tools. No special tools
are needed.
• Troubleshooting can be done with ordinary commercial measuring devices.
• Defective components on printed circuit boards require replacement of the entire
printed circuit board. Defective printed circuit boards must be sent to Tucker for
repair.
Caution:
• Printed circuit boards must not be removed or inserted if the
welding device is carrying system voltage!
Warning:
• All responsibility and liability are rejected if repairs are improper
or external replacement parts are used.