623 Exam Table Upholstery Heater System Troubleshooting
|
Model |
623 -010 |
| Serial Number | All |
This illustration shows only the components that affect the Upholstery Heater System. A detailed description of current flow during this function also appears below.
Upholstery Heater Operation
115 VAC is supplied thru the IEC inlet to the Distribution PC board and then to the Upholstery Heater PC board at J2 and J3. Fuses F1 and F2 protect the circuit. Circuitry on PC board converts 115 VAC to 12 VAC.
Depressing and releasing the momentary On/ Off Switch supplies approximately 12 VAC to the Upholstery Heater. A timer on the PC board , initiated when the On/Off Switch is depressed, keeps the heater activated for an 8 hour period unless the Switch is depressed Off.
Temperature knob not present on later models. The upholstery heater temperature can be regulated by the operator. Turning the temperature knob will increase or decrease the voltage to the heater. The temperature can be varied to a maximum of 105° F (41° C).
A thermostat, located in Back Heating Pad, opens at 131° F (55°C) +/- 10% removing power from both Back and Seat heating elements.
Upholstery Heater runs until:
1.Stop button is depressed.
2.8 hour time limit is reached.
3.Fuse(s) on Upholstery Heater PCB opens (blows).
Upholstery Heater System Troubleshooting
Does not heat or illuminate
| Function | Status | Problem |
|---|---|---|
|
Upholstery Heater |
|
Does not heat up. |
|
Heater Switch |
|
Does not illuminate. |
1.Loose wire connects between Distribution Board and Upholstery PCB, Upholstery PCB to Heater Switch.
2.Upholstery PCB fuses. Test Uph. PC Board fuses. Refer to:Fuses
3.Perform Upholstery Heater Switch Test. Refer to:Upholstery Heater System
4.Perform Upholstery Heater PC Board Test. Refer to:Upholstery Heater System
Does not heat, does illuminate
| Function | Status | Problem |
|---|---|---|
|
Upholstery Heater |
|
Does not heat up. |
|
Heater Switch |
|
Illuminates. |
1.Loose wire connects between Upholstery PCB to heater, Upholstery PCB to Heater Switch, Back and Seat heater connection.
2.Perform Upholstery Heater Switch Test. Refer to:Upholstery Heater System
3.Perform Upholstery Heater Test. Refer to:Upholstery Heater System
4.Perform Upholstery Heater PC Board Test. Refer to:Upholstery Heater System
Heater ok, Switch does not illuminate
| Function | Status | Problem |
|---|---|---|
|
Upholstery Heater |
|
Ok |
|
Heater Switch |
|
Does not illuminate. |
1.Replace Upholstery Heater Switch Test. Refer to:Upholstery Heater System
