OHAUS DISCOVERY BALANCE, Руководство по обслуживанию

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TABLE OF CONTENTS
LIST OF ILLUSTRATIONS (Cont.)
FIGURE NO. TITLE Page No.
3-52 Solder points on bottom of Load Cell PCB ..........................................................3-27
3-53 Up/Down Stop Plate ............................................................................................3-28
3-54 Removing Temperature Conductor .....................................................................3-28
3-55 Removing screws that secure the Magnet Cover................................................3-28
3-56 Lifting off the Magnet Cover ................................................................................3-28
3-57 Removing Thumb screws that hold Hanger in place ...........................................3-29
3-58 Load Cell without Hanger and Brass Fixture .......................................................3-29
3-59 Screws on each side of yoke holding Ratio Beam must be removed .................3-29
3-60 Ratio Beam, removed from Load Cell .................................................................3-30
3-61 Magnet gap and Temperature Sensor Tube should be
carefully examined for dust and debris................................................................3-30
3-62 Coil Assembly should be carefully examined and cleaned .................................3-30
3-63 Yoke of Ratio Beam must align with frame of Load Cell .....................................3-31
3-64 Installing Ratio Beam with hole centered over the Temperature Sensor Tube ...3-31
3-65 Yoke aligned with frame side-to-side, and flush with frame on front ...................3-32
3-66 Centering Pin goes into Temperature Sensor Tube in middle of Magnet ...........3-33
3-67 Hanger installed, with Brass Fixture and Brass Brackets....................................3-34
3-68 Magnet Cover has oblong hole that clears Ratio Beam’s stop tab......................3-35
3-69 Inserting screws to secure the Magnet Cover .....................................................3-35
3-70 Inserting the Temperature Conductor in the middle of the Magnet Cover...........3-35
3-71 The Temperature Conductor groove should line up with the two Screws ...........3-35
3-72 Up/Down Stop Plate which rests on Magnet Cover ............................................3-36
3-73 Up/Down Stop Plate inserted over Ratio Beam tab
and PCB screw receptacle on Magnet Cover .....................................................3-36
3-74 Load Cell PCB is secured with 2 screws (with Step Bushing on the back) .........3-36
3-75 Fine wires must have smooth arc for the balance to function properly ...............3-37
3-76 Load Cell should rest on Threaded Rod, and base of frame...............................3-38
3-77 Installing the bottom Flexure Arm........................................................................3-39
3-78 Top Flexure Arm Assembly, with Flexure screw heads facing outward ..............3-39
3-79 Installing the upper Flexure Arm .........................................................................3-39
3-80 Load Flexure, aluminum washers, steel washers and screws ............................3-40
3-81 Load Flexure on top of Hanger, with elongated screw hole at bottom ................3-40
3-82 Hanger with Thumb screws removed ..................................................................3-41
3-83 Pushing Brass Fixture from grooved side ...........................................................3-41
3-84 Pulling Brass Fixture out from square side..........................................................3-41
3-85 Note stops on sides of bottom Load Cell Cover ..................................................3-42
3-86 Tightening screws on bottom Load Cell Cover....................................................3-42
3-87 Top Load Cell Cover rests flush against bottom cover........................................3-43
3-88 Tightening screws on top Load Cell Cover..........................................................3-43
3-89 If Hanger moves smoothly, assembly is successful ............................................3-44
3-90 Load Cell Chassis with keyway at point of triangle .............................................3-45
3-91 Three screws on bottom that secure the Load Cell to the Chassis .....................3-45
3-92 Cantilever Arm in correct position .......................................................................3-45
3-93 Replacing Load Cell Cover..................................................................................3-46
3-94 Load Cell with Cover in proper position, cables resting in notches .....................3-46
3-95 Placing PCB Mounting Plate on Load Cell ..........................................................3-47
3-96 Stand-off screws secure PCB Mounting Plate ....................................................3-47
3-97 Installing Weights and Weight Holders................................................................3-48
Ohaus Corporation www.ohaus.com iv Discovery Balance Service Manual