222 Exam Table, 223 and 623 Table Base Up / Down Operation Troubleshooting
This illustration shows only the components that affect the Base Up/Down function. Refer to the following page for a detailed description of current flow during this function.
Power To Foot Control
115 VAC is supplied thru the two primary fuses (F1 and F2) to the transformer on the PC board. F4 fuse protects the transformer.
The transformer reduces the line voltage and supplies 14 VAC to the foot control.
Base Up Operation
When the Base Up function is activated, current (14 VAC) flows thru the Up function foot switch (N.O), then back to the PC board. Circuitry on the PC Board energizes the base relay. F3 fuse protects the base motor.
(2) Normally Open: Base Up function
(2) Normally Closed: Base Down function.
When the base relay is energized, the (2) Normally Open contacts of the relay close. When these contacts close, current (48 VDC) flows to the actuator motor.
When current flows to the actuator thru the Normally Open contacts of the relay, the actuator motor runs and raises the table.
Actuator Motor runs until:
1.Foot control pedal is released.
2.Base Up limit switch is tripped.
3.26 second software time limit is reached.
4.Fuse(s) opens (blows). Primary, Base Motor, Transformer fuse.
Base Down Operation
When the Base Down function is activated, current (14 VAC) flows thru the Down function foot switch (N.O.), then back to the PC Board.
(2) Normally Open: Base Up function
(2) Normally Closed: Base Down function
When this voltage is applied, current (48 VDC) flows to the actuator motor thru the (2) Normally Closed contacts of the Base Up/Down relay. The relay does not energize.
When voltage flows to the actuator thru the Normally Closed contacts of the relay, the actuator motor runs and lowers the table.
Actuator Motor runs until:
1.Foot control pedal is released.
2.Base Down limit switch is tripped.
3.26 second software time limit is reached.
4.Fuse(s) opens (blows). Primary, Base Motor, Transformer fuse .
If an overload condition* is detected the PC board will beep and all power functions will be disabled. Release the function button, remove load, then retry function. *weight limit exceeded, mechanical binding, etc.
No Movement
| Function | Status | Problem |
|---|---|---|
|
Base Up |
|
No Movement |
|
Base Down |
|
No Movement |
1.Loose wire connections, especially the Foot Control and Base Up/Down Limit Switches.
2.Main PC Board Fuses. Test fuses: F1, F2, F3, and F4. Refer to:Fuses
3.Perform Footswitch Test. Refer to:Foot Control
4.Base Actuator. To isolate the malfunction. Refer to:Base/Back Actuator
5.Perform Base Relay Test. Refer to:Main PC Board
6.230 V models only: 230 VAC Transformer and Transformer Fuses (2). Refer to:Fuses
Base Up No Movement, Base down ok
| Function | Status | Problem |
|---|---|---|
|
Base Up |
|
No Movement |
|
Base Down |
|
OK |
1.Loose wire connections, especially the Foot Control and Base Up/Down Limit Switches.
2.Base Up Limit Switch. Perform Limit Switch Test. Refer to:Limit Switches
3.Perform Footswitch Test. Refer to:Foot Control
4.Perform Base Relay Test. Refer to:Main PC Board
Base Up Ok, Base Down no Movement
| Function | Status | Problem |
|---|---|---|
|
Base Up |
|
Ok. |
|
Base Down |
|
No Movement. |
1.Loose wire connections, especially the Foot Control and Base Up/Down Limit Switches.
2.Base Down Limit Switch. Perform Limit Switch Test. Refer to:Limit Switches
3.Perform Footswitch Test. Refer to:Foot Control
4.Perform Base Relay Test. Refer to:Main PC Board
Table Drifts
| Function | Status | Problem |
|---|---|---|
|
Base Up |
|
Table drifts down. |
|
Base Down |
|
Table drifts down. |
1.Run table up and unplug power cord. If drifting stops, perform Footswitch test. If drifting continues, check Base Actuator.
2.Perform Footswitch Test. Refer to:Foot Control
3.Base Actuator. To isolate the malfunction, Refer to:Base/Back Actuator.
Up and Down Pedal works in Reverse
| Function | Status | Problem |
|---|---|---|
|
Base Up |
|
Press Base Up pedal, table moves down. |
|
Base Down |
|
Press Base down pedal, table moves up. |
1.Wire Connections reversed. Check Foot Control and Base Actuator motor connections.
2.Replace Main PC Board. Refer to:Main PC Board
Noisy, Grinding or Squeaking
| Function | Status | Problem |
|---|---|---|
|
Base Up |
|
Noisy/Grinding/Squeaking |
|
Base Down |
|
Noisy/Grinding/Squeaking |
1.Clean and lubricate base actuator threads. Recommended lubricant: Lithium Grease. Refer to:Table shroud removal
2.Remove any debris from base slides. Do not lubricate base slides. Refer to:Table shroud removal
3.Replace Base Actuator. Refer to:Base/Back Actuator
Moves Slowly
| Function | Status | Problem |
|---|---|---|
|
Base Up |
|
Moves slowly |
|
Base Down |
|
Moves slowly |
1.Did patient exceed 400 lb. weight limit? Inform staff that max patient weight is 400 lbs.
2.Low voltage to table.
| Required Voltage | |
|---|---|
| 115 VAC models | 115 +/- 10% VAC |
| 230 VAC Models | 230 +/- 10% VAC |
