What does INVREP trouble mean on the MS-9200UDLS and how do I resolve it?
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INVREP indicates an invalid reply from an addressable device, which typically points to a hardware or communication problem (Page 131, 136) [1].
This maintenance alert is specifically triggered when a detector reports a Low Chamber Value (Page 151) [1].
To resolve this trouble:
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Clean the detector and re-check the chamber reading (Page 152) [1].
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If the reading remains outside the recommended range or the hardware fault persists, replace the detector (Page 152) [1].