trouble shooting PCB module

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The circuit board is sometimes referred to as a "module" in the field.
The power to the Von Duprin potted module also called potted circuit breaker is non polarized.
The TK400 kit contains an PIM400-TD2 and a WPR400-DT (Dummy Trim) and charger. The WPR400-DT reader has no electronics it is an empty plastic shell. Since the WPR400-DT does not have electronics ...
If a factory default reset (FDR)  is absolutely needed, you MUST temporarily replace the credential reader with another reader that has a Schlage Button.  This should be rarely if ever required. T...