CPXD-350,500 SERVICE MANUAL
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1. Caution in maintenance
1.1 To avoid electric shock and accident
When checking internal power source, turn off the primary side of line disconnect switch and the
control power source switch, wait more than 3 minuets and check that the built-in cooling fan stops
completely then carry out checking. And be careful not to turn on these switches by mistake during
check.
Be in particular careful where the place indicated
“
High voltage danger
”
.
According to measuring instrument oscilloscope and so on the like, terminal for measurement and
case are connected electrically. When checking internal welding machine by these measuring
instrument, be careful not to cause an electric shock accident.
1.2 Handling of printed circuit board
(1) Do not to touch the potentiometer which fixed by white pen on the printed circuit board.
It cause to trouble in welding machine.
(2) Insert all printed circuit board certainly to take a lock of circuit board support for attachment.
(3) Insert connector with matching connector number or wiring number certainly to take a lock.
Do not to pull the wire when pulling connector. Carry out pulling and inserting connector after
turning off the power source switch.
(4) Do not leave the place where static electricity is easy to generate because CMOS-IC that is poor
at static is used.
(5) Reduce the number of times as much as possible that pulling and inserting connector and
adjustment of the potentiometer.
Welding power source
Input power
Oscilloscope
