Table Will Not Operate With Any Selection

Midmark Ritter 119 Exam Table Troubleshooting


Problem Sympton Probable Cause Check Solution
Table will not operate when any of the eight up or down functions are selected. When a foot pedal is depressed, motor pump does not run and solenoid cannot be heard being energized (audible click) Power cord is not plugged into facility wall outlet or, on export models, power cord isn't plugged into connector receptacle on table Check to see if power cord is plugged in Plug power cord into facility wall outlet and/or connector receptacle on table
Facility circuit breaker providing power to table is tripped. Check to see if facility circuit breaker is tripped. One way of checking this is to plug a lamp into wall outlet that table was plugged into If circuit breaker is tripped, determine what caused circuit breaker to trip, correct the problem, and then reset/replace circuit breaker
Fuse(s) in AC connector receptacle is blown (export units only) Perform continuity check on fuses Replace fuse(s)
Wire connections loose Check all wiring connections from power cord to terminal block and from foot control to terminal block. Perform continuity check on wires. Use multimeter to check for proper voltage levels Clean any dirty connections. Tighten any loose connections. Replace any damaged connections
Isolation transformer is malfunctioning (export units only) Check input and output voltage of isolation transformer or replace suspect isolation transformer with known working transformer If isolation transformer is receiving proper input voltage but is not supplying 115 VAC output, replace isolation transformer
When a foot pedal is depressed, motor pump does not run, but solenoid can be heard being energized (audible click) Capacitor(s) is blown (motor pump may be humming Replace suspect capacitor(s) with known working capacitor(s) Replace capacitor(s) Part #MIC120-6313
Motor thermal overload switch is activated because motor pump overheated Unplug power cord and then wait 15 to 20 minutes Allow motor pump to cool and then try to operate table. If motor pump does not run now, replace motor pump
Motor pump is burned out Replace suspect motor pump with known working motor pump Replace motor pump
Wire connections loose Check all wiring connections from terminal block to motor pump. Use multimeter to check for proper voltage levels Clean any dirty connections. Tighten any loose connections. Replace any damaged connections
When a foot pedal is depressed, motor pump runs, but table top does not move Time delay relay is malfunctioning Use a jumper wire to bypass time delay relay. If table moves, time delay relay is malfunctioning.

Put a multimeter in line w/time delay relay and run each cylinder one at a time
A multimeter reading > 1.2 amps indicates a malfunctioning cylinder has caused the relay to fail.

Replace the malfunctioning cylinder and the time delay relay. Refer to proper cylinder replacement instructions.

If reading is < 1.2 amps, replace time delay relay only
When a foot pedal is depressed, motor pump runs and solenoid can be heard energizing Hydraulic system is low on mineral oil Check oil level in reservoir If necessary, add oil to reservoir Part #RPF384-6316
When a foot pedal is depressed, motor pump hums, but does not run Capacitor(s) is blown Replace suspect capacitor(s) with known working capacitor(s) Replace capacitor(s) Part #MIC020-6313
Motor pump is locked up or burned out Replace suspect motor pump with known working motor pump Replace motor pump

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