OHAUS 3000 Series T31P, Service Manual

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CHAPTER 3 MAINTENANCE PROCEDURES
3.2.2 Cable Set Replacement
Note : The cables that connect the PCB to the Load Cell connector, the RS232
connector, the AC power outlet, and (in the case of the T31P) the Lead Acid Battery, are
all sold as a single set. Replace them singly or together, as follows:
1. Open the Housing.
2.
Disconnect the cables from any of the connectors (RS232, Load Cell, AC outlet) for
which the cable set is to be replaced. In the case of the T31P’s battery, remove the
quick-connect tabs that hold the cables in place.
3. Reconnect the wires to the PCB.
3.2.3 Function Label & Membrane Switch Replacement
1. On the T31XW, open the Housing and disconnect the plastic ribbon cable that
connects the Membrane Switch to the PCB.
2. Carefully remove the old Function Label or Membrane Switch. It is held in place with
a strong adhesive.
3. Clean the Top Cover and remove all traces of adhesive.
4. Remove the protective backing from the back of the new Function Label or
Membrane Switch. Carefully position it on the Top Housing, starting at the bottom of
the cover. Use a rolling motion to smooth it into position.
5. On the T31XW, connect the plastic ribbon cable that connects the Membrane Switch
to the PCB.
6. Close the Housing (if opened previously), re-insert and tighten the four screws
previously removed.
7. Perform calibration procedures. (See Section 1.8.)
8.
Perform testing procedures. (See Chapter 4.)
3000 Series T31 Indicators Service Manual 3-3 Ohaus Corporation www.ohaus.com