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Which of the following serves an important part in troubleshooting in VCRs?

Which of the following serves an important part in troubleshooting in VCRs? Correct Answer Substitution

Substitution serves an important part in troubleshooting in VCRs. Most of the troubles can be found by simply substituting the parts with some other device. A person having a plentiful theoretical knowledge about the functioning of the device parts can diagnose the problem with much more ease than that of a person with less knowledge.

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