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LABC1 • 20
TROUBLESHOOTING GUIDE
If your LABC1 does not work correctly after construction, recheck the
following:
• correct orientation of VR1, and U1 (see PC board layout diagram)
• correct polarity of electrolytic capacitors
• correct orientation of diodes D1 to D17
• correct orientation of transistor Q1
• No shorted traces on the bottom side of the circuit board
• all solder connections.
Hints
• Erratic or unstable operation is generally caused by faulty solder joints or
cable connections.
Replacement components may be ordered directly from Ramsey Electronics,
Inc. but records show that failure rates for these parts are extremely low.
Please understand that it is nearly impossible to “troubleshoot” by phone. Any
specific questions should be documented and sent to us by email or snail-
mail. Email questions should be sent to techsupport@ramseyelectronics.com.