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Chair Will Not Operate

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Chair Will Not Operate



Midmark Ritter 117 Podiatry Chair Troubleshooting Guide
Chair Will Not Operate



Symptom Probable Cause Check Resolution
If Chair will not operate when any of the six UP or when Down when functions or Auto-Return function is selected or When Foot Switch is depressed, motor pump does not run and cylinder solenoid(s) do not energize (no audible click): Power cord is not plugged into wall outlet, or power cord is not plugged into connector receptacle on chair on export models Make sure power cord is plugged in Plug power cord into facility outlet and/or connector receptacle on chair
  Outlet Circuit Breaker providing power to chair has tripped Check Outlet Circuit Breaker Correct the problem & Reset the Circuit Breaker
  Fuses in AC connector receptacle is blown (on export models only) Perform Continuity Test on Fuses Replace fuses
  Wire connections are loose Check wiring connections from power cord to terminal block Clean dirty connections. Repair or replace loose or damaged connections
  Isolation Transformer is malfunctioning (export units only) Check input and output voltage of Isolation Transformer If Isolation Transformer is receiving the proper input voltage but is not supplying 115VAC output, replace Isolation Transformer
When any Foot Switch/Switch is depressed, motor pump does not run, but Cylinder Solenoids energize (audible click) Capacitors are blown (Motor Pump may be humming) Replace suspect Capacitors with known working Capacitors Replace Faulty Capacitor. Click Here
  Motor Thermal Overload switch is activated because Motor Pump overheated Wait 15 to 20 minutes Allow Motor Pump to cool and then try to operate chair. If Motor Pump does not run now, replace the motor pump
  Motor Pump is burned out   Replace Motor Pump
  Wire connections are loose Check wiring connections from power cord to terminal block Clean dirty connections. Repair or replace loose or damaged connections
When any Foot Switch/switch is depressed, Motor Pump runs but chair does not move Time Delay is malfunctioning Use a jumper wire to bypass the Time Delay. If chair moves, Time Delay is malfunctioning

Put a multimeter in line with Time Delay, and run each cylinder one at a time

A Multimeter reading greater than 1.2 amps indicates a faulty cylinder has caused relay to fail. Replace both the Cylinder & the Time Delay Part #MIR017-6445

For available cylinders, Click Here

If multimeter reading is less than 1.2 amps, replace the Time Delay only Part #MIR017-6445

When any Foot Switch/Switch is depressed, Motor Pump runs and solenoid can be heard energizing Hydraulic System is low on Hydraulic Fluid Check oil level in reservoir Add Hydraulic Fluid Part #RPF384-6454 to reservoir as needed
When any Foot Switch/Switch is depressed, Motor Pump hums, but does not run

Capacitor(s) is blown

Motor Pump is locked up or burned out

Replace suspect Capacitor with known working capacitor(s)

Replace suspect Motor Pump with known working Motor Pump

Replace defective Capacitor(s)with Part #MIC020-6429

Replace defective motor pump