Ohaus Indicator T51XW

Separate the Top and Bottom Housing (Follow steps 1 – 3 in Section 3.2.1.)

Membrane Switch Disconnection and Removal

Disconnect the plastic ribbon cable from the Membrane Switch to the Display PCB’s Keypad Connector.

Lift up the defective Membrane Switch and gently peel it off the Upper Housing.

Cleaning and New Membrane Switch Installation

Clean the Top Housing Membrane Switch area, removing all traces of adhesive.

Remove the protective backing from the new Membrane Switch.

Carefully position the new Membrane Switch on the Top Cover using a rolling motion.

Separate the Top and Bottom Housing

Remove the Main PCB on the T51XW

Remove the four screws from the Display PCB

Connect the ribbon cables to the replacement Display PCB

Turn the Indicator OFF and disconnect the AC Adapter or power cord

Reconnect the AC Adapter or power cord to the Indicator

Check to ensure that the Indicator retained calibration settings

Record any discrepancies found during the test

Confirm all connections are secure

Unplug the AC Adapter before cleaning.

Has the Indicator been moved from a different temperature area?

Select the Indicator model and perform the appropriate cleaning procedure.

Ensure no chemical cleaners or solvents are used.

Check the Power Cord for broken or damaged insulation.

Make a visual inspection for faulty connectors, wiring, and loose hardware.

Unplug the Indicator from the AC Adapter

Remove the four screws from the Bottom Housing

Carefully separate the Top Housing and Bottom Housing

Disconnect the Display PCB’s ribbon cable from the top of the Main PCB (T51P only)

Pull all cable connectors from their plugs on the Main PCB

Disconnect the Display PCB’s ribbon cable from the Main PCB (T51XW only)