OHAUS PA64 Service Manual

Also see for Carat PAJ1003: Instruction manual

Contents

OHAUS PA64 Service Manual Manual pdf 50 page image

CHAPTER 3 MAINTENANCE PROCEDURESOhaus Corporation www.ohaus.com 3-26 Pioneer Balance Service Manual3.3.16 Disassembling Analytical Load Cells16. Unsolder the two white wires connected to the Position Sensor Board. Then removethe two inset screws that secure the board to the Load Cell. Carefully lift the PositionSensor Board away from the Load Cell. (See Figure 3-68.)Figure 3-68. Two solder points and two screwholes for removing the Position Sensor Board.Figure 3-69. Contact Board with 3-wire ribboncable soldered to it.17. Unsolder the three points of the 3-wire ribbon cable that connect to the ContactBoard at the rear of the Load Cell. (See Figure 3-69.)18. Use an ohm meter to measure resistance from the middle wire to each side wire.The readings should be approximately equal, at around 400-460 Ω (ohms). Theresistance from any wire to the frame should be open or infinity. If any resistance ismeasured, the Ratio Beam must be replaced.19. Remove the four screws that secure the Magnet Half. (See Figure 3-70.) Grasp theMagnet Half from the top, and lift it out. It may be necessary to pull hard, toovercome the magnetic force, as well as possible resistance caused by corrosion.Figure 3-70. Four screws secure the MagnetHalf to the Ratio Beam.Figure 3-71. The Magnet Half, whenremoved, should be cleaned.ContactBoard with3-wirecableattached