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Army Medical Dental Chair, Stool, and Dental Operating UnitDental Chair, Stool, and Dental Operating UnitDevelopmentTable of ContentsIntroductionCredit AwardedLesson AssignmentLesson 1: Perform Preventive Maintenance Checks and Services on the Dental Chair and StoolPedestal and Motor Assembly. Seat Motor Assembly. Perform Preventive Maintenance Checks and ServicesFigure 1-2. Floor plate assembly.Figure 1-3. Pantograph arms.Figure 1-4. Cradle assembly.Exercises, Lesson 1Exercises, Lesson 1-cont.Exercises, Lesson 1-cont.Solutions to Exercises, Lesson 1Lesson AssignmentLesson 2: Isolate Malfunctions to Component Level in the Dental Chair and StoolFigure 2-1. Schematic for the JSR Dental Chair.Tilting the Seat Up.Isolate Malfunctions to the Component LevelFigure 2-2. Dental chair power cord.Isolate Malfunctions to the Component Level-cont.Isolate Malfunctions to the Component Level-cont.Exercises, Lesson 2Exercises, Lesson 2-cont.Solutions to Exercises, Lesson 2Lesson AssignmentLesson 3: Remove and Replace or Repair Defective Components of the Dental Chair and StoolFigure 3-1. Doctor and assistant controls.Replacing Base Motor (PLR-200)Figure 3-3. PLA-R-200 lift.Remove the gear motor and the capacitor.Figure 3-4. PL-200 wiring diagram.Figure 3-5. PLA-200 precision lift.Chair Is in "DOWN" Position and Will Not Raise.Replacing the Back Motor AssemblyFigure 3-7. Wood block installation.Figure 3-8. Back motor bracket installation.Replacing the Seat MotorReplacing the Seat Motor-cont.Exercises, Lesson 3Exercises, Lesson 3-cont.Solutions to Exercises, Lesson 3Lesson AssignmentLesson 4: Perform Preventive Maintenance Checks and Services on the Dental Operating UnitFigure 4-1. A-DEC dental operating unit schematic diagram.Dental Operating Unit ComponentsControl Blocks. Control Blocks-cont.Unit Operation and Check Out ProcedureAdjust the delivery pressuresFigure 4-5. Control panel and handpiece hangers.Push the master ON-OFF toggle to the right.Verify that each handpiece expels drive airRoutine Preventive Maintenance Checks and ServicesClean and Inspect the Internal Parts.Exercises, Lesson 4Exercises, Lesson 4-cont.Solutions to Exercises, Lesson 4Lesson AssignmentLesson 5: Isolate Malfunctions to the Component Level in the Dental Operating UnitFigure 5-2. Pilot-operated regulators.Figure 5-3. Water relays.Air Bubbles in the Coolant Water.Troubleshoot an Air Subsystem MalfunctionFigure 5-5. Foot control and foot control valve.Troubleshoot a Handpiece Holdback System MalfunctionAll the Handpieces Run While in Their Holders. One Handpiece Runs While in Its Holder.Troubleshoot a Master Block Assembly MalfunctionThe ON-OFF Indicator Shows ON.Troubleshoot the Pilot-Operated RegulatorsTroubleshoot the Pre-RegulatorsFigure 5-8. Pre-regulators.No Pressure from the Outlet. Troubleshoot the Automatic Bowl Rinse SystemImproper Adjustment of the Bowl Rinse Time Control.Defective Time Control Valve-cont.Exercises, Lesson 5Exercises, Lesson 5-cont.Solutions to Exercises, Lesson 5Lesson AssignmentLesson 6: Remove and Replace or Repair Defective Components of the Dental Operating UnitTest Gauge.Sleeve Tool. Umbilical Tubing Stringer.O-Ring Installation Tools.Remove and Replace Pilot-Operated Regulator DiaphragmRemove and Replace Foot Control Signal Relay Valve O-RingsRemove and Replace Master block 3-Way Cartridge Valve Stem O-RingFigure 6-14. Cartridge valve, 3-way.Remove and Replace Weak Spring in Foot ControlExercises, Lesson 6Exercises, Lesson 6-cont.Solutions to Exercises, Lesson 6Appendix: Dental Chair (Model JSR) Troubleshooting GuideProblem 1: Chair or lift will not operate-cont.Problem 1: Chair or lift will not operate-cont.Problem 1: Chair or lift will not operate-cont.Problem II. Foot switch fails to raise or lower the chair.Problem IV. Automatic control fails to operate (manual controls are operating.Problem VI. Arm will not hold position.
Army Medical
Dental Chair, Stool, and Dental Operating UnitDental Chair, Stool, and Dental Operating UnitDevelopmentTable of ContentsIntroductionCredit AwardedLesson AssignmentLesson 1: Perform Preventive Maintenance Checks and Services on the Dental Chair and StoolPedestal and Motor Assembly. Seat Motor Assembly. Perform Preventive Maintenance Checks and ServicesFigure 1-2. Floor plate assembly.Figure 1-3. Pantograph arms.Figure 1-4. Cradle assembly.Exercises, Lesson 1Exercises, Lesson 1-cont.Exercises, Lesson 1-cont.Solutions to Exercises, Lesson 1Lesson AssignmentLesson 2: Isolate Malfunctions to Component Level in the Dental Chair and StoolFigure 2-1. Schematic for the JSR Dental Chair.Tilting the Seat Up.Isolate Malfunctions to the Component LevelFigure 2-2. Dental chair power cord.Isolate Malfunctions to the Component Level-cont.Isolate Malfunctions to the Component Level-cont.Exercises, Lesson 2Exercises, Lesson 2-cont.Solutions to Exercises, Lesson 2Lesson AssignmentLesson 3: Remove and Replace or Repair Defective Components of the Dental Chair and StoolFigure 3-1. Doctor and assistant controls.Replacing Base Motor (PLR-200)Figure 3-3. PLA-R-200 lift.Remove the gear motor and the capacitor.Figure 3-4. PL-200 wiring diagram.Figure 3-5. PLA-200 precision lift.Chair Is in "DOWN" Position and Will Not Raise.Replacing the Back Motor AssemblyFigure 3-7. Wood block installation.Figure 3-8. Back motor bracket installation.Replacing the Seat MotorReplacing the Seat Motor-cont.Exercises, Lesson 3Exercises, Lesson 3-cont.Solutions to Exercises, Lesson 3Lesson AssignmentLesson 4: Perform Preventive Maintenance Checks and Services on the Dental Operating UnitFigure 4-1. A-DEC dental operating unit schematic diagram.Dental Operating Unit ComponentsControl Blocks. Control Blocks-cont.Unit Operation and Check Out ProcedureAdjust the delivery pressuresFigure 4-5. Control panel and handpiece hangers.Push the master ON-OFF toggle to the right.Verify that each handpiece expels drive airRoutine Preventive Maintenance Checks and ServicesClean and Inspect the Internal Parts.Exercises, Lesson 4Exercises, Lesson 4-cont.Solutions to Exercises, Lesson 4Lesson AssignmentLesson 5: Isolate Malfunctions to the Component Level in the Dental Operating UnitFigure 5-2. Pilot-operated regulators.Figure 5-3. Water relays.Air Bubbles in the Coolant Water.Troubleshoot an Air Subsystem MalfunctionFigure 5-5. Foot control and foot control valve.Troubleshoot a Handpiece Holdback System MalfunctionAll the Handpieces Run While in Their Holders. One Handpiece Runs While in Its Holder.Troubleshoot a Master Block Assembly MalfunctionThe ON-OFF Indicator Shows ON.Troubleshoot the Pilot-Operated RegulatorsTroubleshoot the Pre-RegulatorsFigure 5-8. Pre-regulators.No Pressure from the Outlet. Troubleshoot the Automatic Bowl Rinse SystemImproper Adjustment of the Bowl Rinse Time Control.Defective Time Control Valve-cont.Exercises, Lesson 5Exercises, Lesson 5-cont.Solutions to Exercises, Lesson 5Lesson AssignmentLesson 6: Remove and Replace or Repair Defective Components of the Dental Operating UnitTest Gauge.Sleeve Tool. Umbilical Tubing Stringer.O-Ring Installation Tools.Remove and Replace Pilot-Operated Regulator DiaphragmRemove and Replace Foot Control Signal Relay Valve O-RingsRemove and Replace Master block 3-Way Cartridge Valve Stem O-RingFigure 6-14. Cartridge valve, 3-way.Remove and Replace Weak Spring in Foot ControlExercises, Lesson 6Exercises, Lesson 6-cont.Solutions to Exercises, Lesson 6Appendix: Dental Chair (Model JSR) Troubleshooting GuideProblem 1: Chair or lift will not operate-cont.Problem 1: Chair or lift will not operate-cont.Problem 1: Chair or lift will not operate-cont.Problem II. Foot switch fails to raise or lower the chair.Problem IV. Automatic control fails to operate (manual controls are operating.Problem VI. Arm will not hold position.
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