225 Exam Chair Diagnostic LEDs Troubleshooting

The 225 has six LEDs and a diagnostic switch (S1) located on the Motor Control PC board for diagnostic purposes.

There are three modes that use these LEDs; Run Mode, Switch Check Mode, and Error Display Mode. You can switch between these modes by pressing and holding the S1 switch for three seconds.

225 Exam Chair Diagnostic LEDs - Run Mode

The Run Mode is the default configuration of the system. It is where the other modes revert to if the S1 switch is not pressed for fifteen minutes.

Activity

Definition

Green (OK) LED Flashing

System operating normally

Red (RD) LED Flashing

System has an error

225 Exam Chair Diagnostic LEDs - Switch Check Mode

The Switch Check Mode allows for checking the switches without the use of special equipment.

To enter the Switch Check Mode, press and hold the diagnostic switch (S1) for three seconds. The Motor Control PC Board will give two short beeps and the majority of the diagnostic LEDs will turn on.

In the Switch Check Mode, activating a limit switch turns off a LED, see table below. Pressing a control switch on the Foot control will elicit a single beep from the Motor Control PC Board. This mode will time out and revert to the Run Mode after fifteen minutes.

Activity

Definition

Green (OK) LED Flashing

System running.

Green (GR) LED Off

Back Up limit switch “Open”

White (WT) LED Off

Back Down limit switch “Open”

Orange (OR) LED Off

Active Sensing Technology switch(es) “Open”

Blue (BL) LED Off

Base Up limit switch “Open”

Red (RD) LED Off

Base Down limit switch “Open”

225 Exam Chair Diagnostic LEDs - Error Display Mode

The Error Display mode allows for viewing of both current and past errors detected by the Motor Control PC Board. Errors are detectable by the Motor Control PC Board and these are indicated by the use of LEDs with a last LED (Red) to indicate if the error being displayed is current.

To show the errors: From the Run Mode, press the diagnostic switch (S1) once for three seconds and then press it again for three seconds. The most recent error will be displayed by the LEDs. If no errors have been detected, no LEDs will turn on. Pressing the S1 switch again will display the next most recent error. Repeating switch presses will continue displaying subsequent errors until the error list is complete and the LEDs will all be off. Pressing the S1 switch again will repeat this process.

The LED pattern for each error is in the table below. The LEDs will turn off if a switch is not pressed for fifteen minutes.

Pressing and holding the S1 switch for ten seconds will clear all errors. Two Beeps will occur, one after three seconds and one after ten seconds.

Activity

Code

Definition

Green (OK) LED Flashing

N/A

System running.

Green (OK) LED Off

N/A

Error Condition

Red (RD) LED On

N/A

Current Error

Green (GR) LED On

01

Micro Over Temperature

White (WT) LED On

02

Active Sensing Technology and Base Up limit switches “Open”

Green (GR), White (WT) LED’s On

03

Back Up and Down limit switches “Open”

Orange (OR) LED On

04

Base Up and Down limit switches “Open”

Green (GR), Orange (OR) LED’s On

05

Back Over Current

White (WT), Orange (OR) LED’s On

06

Base Over Current

Green (GR), White (WT), Orange (OR) LED’s On

07

Back Over Voltage

Blue (BL) LED On

08

Base Over Voltage

Green (GR), Blue (BL) LED’s On

09

NVM Error

White (WT), Blue (BL) LED’s On

10

Motor Bus Voltage Low

Green (GR), White (WT), Blue (BL) LED’s On

11

Motor Bus Voltage High

Orange (OR), Blue (BL) LED’s On

12

Micro Low Voltage

Green (GR), Orange (OR), Blue (BL) LED’s On

13

Switch(es) pressed at startup

White (WT), Orange (OR), Blue (BL) LED’s On

14

Motor Bus Fuse (F1) Blown or Overtravel limit switch “Open”

Error Code

 

Error Definition

 

Cause

Check

Action

01

Micro Over Temperature

Motor Control PC board.

Check if Motor Control PC board is overheating.

Disconnect power to allow Motor Control PC board to cool. See if error clears.

Check Motor Control PC board components for overheating and replace PC board.

02

Active Sensing Technology and Base Up switch(es) “Open”

Active Sensing Technology activated.

Check if chair came in contact with another object.

Remove object from beneath drawer.

Active Sensing Technology switch(es).

On Motor Control PC Board J4 connection, jump white wires for AST switches.

Refer to: Base Function / Fuses and Connections

Replace defective switch(es).

Refer to: Active Sensing Technology Switches

Loose or faulty Active Sensing Technology switch wire connections.

Check wire connections between Motor Control PC board and AST switches.

Refer to: Base Function / Fuses and Connections

Secure or replace loose wire connections.

Refer to: Active Sensing Technology Switches

Base Up limit switch.

On Motor Control PC Board J5 connection, jump white wires for Base Up limit switch.

Refer to: Base Function / Fuses and Connections

Replace defective limit switch.

Refer to: Base Function Components

Loose or faulty Base Up limit switch wire connections.

Check wire connections between Motor Control PC board and limit switch.

Refer to: Base Function / Fuses and Connections

Secure or replace loose wire connections.

03

Back Up and Down limit switch(es) “Open”

Back up limit switch.

On Motor Control PC Board J4 connection, jump grey wires for Back up limit switch.

Refer to: Back Function / Fuses and Connections

Replace defective limit switch.

Refer to: Back Function Components

Loose or faulty Back up limit switch wire connections.

Check wire connections between Motor Control PC board and limit switch.

Refer to: Back Function / Fuses and Connections

Secure or replace loose wire connections.

Back down limit switch.

On Motor Control PC Board J4 connection, jump white wires for Back down limit switch.

Refer to: Back Function / Fuses and Connections

Replace defective limit switch.

Refer to: Back Function Components

Loose or faulty Back down limit switch wire connections.

Check wire connections between Motor Control PC board and limit switch.

Refer to: Back Function / Fuses and Connections

Secure or replace loose wire connections.

04

Base Up and Down limit switch(es) “Open”

Base Up limit switch.

On Motor Control PC Board J5 connection, jump white wires for Base Up limit switch.

Refer to: Base Function / Fuses and Connections

Replace defective limit switch.

Refer to: Base Function Components

Loose or faulty Base Up limit switch wire connections.

Check wire connections between Motor Control PC board and limit switch.

Refer to: Base Function / Fuses and Connections

Secure or replace loose wire connections.

Base down limit switch.

On Motor Control PC board J5 connection, jump black wires for Base down limit switch.

Refer to: Base Function / Fuses and Connections

Replace defective limit switch.

Refer to: Base Function Components

Loose or faulty Base down limit switch wire connections.

Check wire connections between Motor Control PC Board and limit switch.

Refer to: Base Function / Fuses and Connections

Secure or replace loose wire connections.

05

Back Over Current

Patient weight exceeded 500 lbs.

Check if patient weight exceeded the 500 lb. weight limit.

Inform staff that maximum patient weight is 500 lbs.

Mechanical binding.

Check actuator mounts and hinge area for damage.

Report any damage to Midmark Technical Service.

06

Base Over Current

Patient weight exceeded 500 lbs.

Check if patient weight exceeded the 500 lb. weight limit.

Inform staff that maximum patient weight is 500 lbs.

Mechanical binding.

Check actuator mounts and scissors / slides for damage.

Report any damage to Midmark Technical Service.

07

Back Over Voltage

Hardware sensed too much voltage across Back actuator motor.

Back actuator motor.

Replace Back actuator motor. If the issue persists, replace Motor Control PC Board.

Motor Control PC Board.

08

Base Over Voltage

Hardware sensed too much voltage across Base actuator motor.

Base actuator motor.

Replace Base actuator motor. If the issue persists, replace Motor Control PC Board.

Motor Control PC Board.

09

NVM Error

Saving to or erasing from memory failed.

Motor Control PC Board.

Disconnect power cord for at least five seconds, then plug back in. See if error clears.

Replace Motor Control PC Board.

10

Motor Bus Voltage Low

Low supply voltage.

Check facility supply voltage.

Contact electrician to modify voltage if necessary.

11

Motor Bus Voltage High

High supply voltage.

Check facility supply voltage.

Contact electrician to modify voltage if necessary.

12

Micro Low Voltage

Loose wire connection. Motor Control PC board malfunction.

Motor Control PC Board.

Disconnect power cord for at least five seconds, then plug back in. See if error clears.

Ensure appropriate voltages are being supplied to Motor Control PC Board.

Replace Motor Control PC Board.

13

Switch(es) activated at power up.

Foot Control activated at power up.

Check if operator depressed Foot Control button at power up.

Inform staff of proper operation.

Damage to Foot Control cord.

Check Foot Control cord for damage. Perform Foot control cord test.

Refer to: Foot Control Cord

Replace Foot Control cord.

Faulty Foot Control.

Test chair operation with known working Foot Control.

Replace Foot Control.

14

Motor Buss Fuse (F1) Blown

Motor Control PC board fuse blown.

Test F1 fuse.

Refer to: Base Function / Fuses and Connections

Replace blown fuse.

Overtravel limit switch.

Overtravel limit switch could be activated. Verify Overtravel limit switch is clear of debris.

Inspect Overtravel limit switch.

Refer to: Base Function Components

On Motor Control PC Board J3 connection, jump orange wires for overtravel limit switch.

Refer to: Base Function / Fuses and Connections

Replace defective limit switch.

Refer to: Base Function Components

Loose or faulty overtravel limit switch wire connections.

Check wire connections between Motor Control PC Board and limit switch.

Refer to: Base Function / Fuses and Connections

Secure or replace loose wire connections.