OHAUS PA64 Service Manual

Also see for Carat PAJ1003: Instruction manual

Contents

OHAUS PA64 Service Manual Manual pdf 78 page image

CHAPTER 3 MAINTENANCE PROCEDURESOhaus Corporation www.ohaus.com 3-54 Pioneer™ Balances Service Manual3.3.34 Setting the Up/Down Stop Screw on Block Style Load CellsThis procedure is required when either the Ratio Beam has been removed or replaced, or whenthe Position Sensor has been replaced.1. Disconnect the Ribbon Cable from the Contact Board to the Load Cell PCB.2. The Load Cell must be completely reassembled and installed in the balanceHousing.3. Plug the Ribbon Cable from the top of the Load Cell PCB into the Main PC Board.4. Attach a Voltmeter (DC range) to the pins on the Load Cell PCB test connector, asshown in Figure 3-159.5. Apply power to the balance.Figure 3-159. Load Cell PCB Test Connector. Figure 3-160. Test Connector Detail.6. Measure the voltage with the Ratio Beam at the bottom of the Up/Down Stop Screw.7. Carefully lift the Ratio Beam withthumb and forefinger until it is atthe top of the Up/Down StopScrew. Measure the voltage again.8. If the two voltage values either sideof zero are not of the samemagnitude, e.g. +2 V and –1.6 V,the vertical stop must be adjusteduntil the values are symmetrical.Maximum difference is 0.2 Volts.9. To adjust the Up/Down Stop Screw,Figure 3-161. Up/Down Stop Screwturn the Screw and repeat Steps 2 and 3 until the readings are within specifications.(See Figure 3-161.)Test ConnectorTest ConnectorTo Voltmeter