what are the safety precautions in troubleshooting electronic equipment?

Answer 1

ONE - when wiring or connecting cables ALWAYS turn off or unplug all audio/video gear FIRST.

TWO - Never touch the + and - wires together.

THREE - never try to repair anything inside of the components yourself.

FOUR - always read your owner's manual first BEFORE installation or for help.

H a p p y
H o m e
T h e a t e r i n g !

Answer 2

If you do not know the answer to this question, you should refer troubleshooting to a qualified technician. This answer is not meant to be sarcastic. You could end up injuring yourself and/or damaging your equipment.