Error Message 54.XX.YY Error for HP LaserJet M601, M602, M603 Series Printers.

HP Say:

54.XX.YY Error

Description

A sensor error has occurred.

Recommended action

54.00.03

Environmental sensor (TH3) failure

• Turn the product off, and then reconnect the connector (J63) on the DC controller PCA. Turn the product on.
• If the environment sensor has been removed or replaced, check the connector (J199) on the environment sensor and the connector (J63) on the DC controller PCA.
• If the error persists, replace the environment sensor assembly.

54.06.21

Primary laser/scanner beam detect abnormality

• Turn the product off, and then on.
• If the product has had parts removed or replace, check the connector (J93) on the DC controller PCA.
• If the error persists, replace the laser/scanner assembly.