627 Chair Diagnostic LEDs and Error Code Troubleshooting

The 627 has six LEDs and a diagnostic switch (S1) located on the Motor Control PC board for diagnostic purposes. There are three modes that used 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.

627 Chair Diagnostic LEDs and Error Code Troubleshooting

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

627 Chair Diagnostic LEDs and Error Code Troubleshooting

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

627 Chair Diagnostic LEDs and Error Code Troubleshooting

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

White (WT) LED On

01

Active Sensing Technology™ and Base Up limit switches “Open”

Green (GR), White (WT) LED’s On

02

Back Up and Down limit switches Open

Orange (OR) LED On

03

Base Up and Down limit switches Open

Green (GR), Orange (OR) LED’s On

04

Back Over Current

White (WT), Orange (OR) LED’s On

05

Base Over Current

White (WT), Blue (BL) LED’s On

06

Motor Bus Voltage Low

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

07

Motor Bus Voltage High

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

08

Switch(es) pressed at startup

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

09

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

Error Code

Error Definition

Cause

Check

Action

01

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.

Replace defective switch(es).

Loose Active Sensing Technology™ switch wire connections.

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

Secure loose wire connections.

Base up limit switch.

On Motor Control PC board J5 connection jump white wires for Base up limit switch.

Replace defective limit switch.

Loose Base up limit switch wire connections.

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

Secure loose wire connections.

02

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.

Replace defective limit switch.

Loose Back up limit switch wire connections.

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

Secure loose wire connections.

Back down limit switch.

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

Replace defective limit switch.

Loose Back down limit switch wire connections.

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

Secure loose wire connections.

03

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.

Replace defective limit switch.

Loose Base up limit switch wire connections.

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

Secure loose wire connections.

Base down limit switch.

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

Replace defective limit switch.

Loose Base down limit switch wire connections.

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

Secure loose wire connections.

04

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.

05

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.

06

Motor Bus Voltage Low

Low supply voltage.

Check facility supply voltage.

Contact electrician to modify voltage if necessary.

07

Motor Bus Voltage High

High supply voltage.

Check facility supply voltage.

Contact electrician to modify voltage if necessary.

08

Foot Control 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.

Replace Foot Control cord.

Faulty Foot Control.

Test chair operation with known working Foot Control.

Replace Foot Control.

09

Motor Buss Fuse (F1) Blown

Motor Control PC board fuse blown.

Test F1 fuse.

Replace blown fuse.

Overtravel limit switch.

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

Inspect Overtravel limit switch.

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

Replace defective limit switch.

Loose overtravel limit switch wire connections.

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

Secure loose wire connections.