Lincoln Electric Comprehensive Guide for Troubleshooting Your Portable Generator

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F-3	TROUBLESHOOTING & REPAIR		F-3
	PC BOARD TROUBLESHOOTING PROCEDURES
	WARNING	- Remove the PC board from the static-shielding bag
		and place it directly into the equipment. Donʼt set the
	ELECTRIC SHOCK	PC board on or near paper, plastic or cloth which
	can kill.	could have a static charge. If the PC board canʼt be
•	Have an electrician install and	installed immediately, put it back in the static-shield-
		ing bag.
	service this equipment. Turn the	- If the PC board uses protective shorting jumpers,
	input power OFF at the fuse box
	before working on equipment. Do	donʼt remove them until installation is complete.
	not touch electrically hot parts.	- If you return a PC board to The Lincoln Electric
	CAUTION	Company for credit, it must be in the static-shielding
		bag. This will prevent further damage and allow prop-
		er failure analysis.
Sometimes machine failures appear to be due to PC		4. Test the machine to determine if the failure
board failures. These problems can sometimes be		symptom has been corrected by the
traced to poor electrical connections. To avoid prob-		replacement PC board.
lems when troubleshooting and replacing PC boards,		NOTE: It is desirable to have a spare (known good)
please use the following procedure:
1. Determine to the best of your technical ability		PC board available for PC board troubleshooting.
		NOTE: Allow the machine to heat up so that all
that the PC board is the most likely component
causing the failure symptom.		electrical components can reach their operating
2. Check for loose connections at the PC board		temperature.
		5. Remove the replacement PC board and
to assure that the PC board is properly		substitute it with the original PC board to
connected.		recreate the original problem.
3. If the problem persists, replace the suspect PC		a. If the original problem does not reappear by
board using standard practices to avoid static		substituting the original board, then the PC
electrical damage and electrical shock. Read		board was not the problem. Continue to look
the warning inside the static resistant bag and		for bad connections in the control wiring
perform the following procedures:		harness, junction blocks, and terminal strips.
PC board can be damaged by static electricity.		b. If the original problem is recreated by the
	- Remove your bodyʼs static	substitution of the original board, then the PC
	charge before opening the static-	board was the problem. Reinstall the
	shielding bag. Wear an anti-static	replacement PC board and test the machine.
	wrist strap. For safety, use a 1	6. Always indicate that this procedure was
ATTENTION	Meg ohm resistive cord connected	followed when warranty reports are to be
	to a grounded part of the	submitted.
Static-Sensitive	equipment frame.	NOTE: Following this procedure and writing on the
Devices	- If you donʼt have a wrist strap,
Handle only at	touch an un-painted, grounded,	warranty report, “INSTALLED AND SWITCHED PC
Static-Safe	part of the equipment frame. Keep	BOARDS TO VERIFY PROBLEM,” will help avoid
Workstations	touching the frame to prevent	denial of legitimate PC board warranty claims.
	static build-up. Be sure not to
	touch any electrically live parts at
	the same time.
- Tools which come in contact with the PC board must
be either conductive, anti-static or static-dissipative.

INVERTEC® V155-S