6809 Controller: Replacing the Controller

Tools required

• Phillips-head Screwdriver

Procedure

IMPORTANT: Always Disconnect Power from the System when Servicing.

1. Remove the four screws which hold the black plastic bezel of the controller to the machine and remove the bezel completely from the unit.
2. Find and remove the two spacer bars which can be metal or plastic on each side of the controller. They are held in place by two screws.
3. Once the spacer bars have been removed, the controller should slide out of the housing brackets to expose the entire back of the controller.
4. Remove the orange connectors at the bottom of the controller, (there are usually 8) by firmly grasping each connector and pulling up on it at a 90 degree angle from the circuit board. Note: The number on each connector should correspond with the same number on the circuit board.
5. At this point, two black pig-tail fuse holders should be the only remaining connectors to be removed so that the entire controller will be free of the machine. To loosen these connectors simply grab each fuse holder at its ends, compress slightly, and twist counter-clockwise. A ½ amp fuse will be remove from each and should be retained for later re-installation. The controller should now be completely removed from the unit and the new one should be prepared for installation at this time. Position the new controller so that it may slide back into the housing brackets and bring the top of the computer down to expose the back of the control panel. Replace each orange connector onto its corresponding header at the base of the computer board.
6. Reconnect the two black pig-tail fuse holders of the controller to the ones at the coming out of housing brackets by placing the 1/2 amp fuse into each fuse holder, joining the two mating halves and twisting clockwise slightly. Tilt up the controller to fit it into the housing brackets and slide it back into place.
7. Replace the spacer bars on each side of the housing by installing the two retainer screws through each bar, through the brackets and into the control unit. Tighten the screws so that the controller is still free to move slightly in the brackets.
8. Place the black plastic bezel over the controller housing and insert the four screws which hold it in place. Push the bezel firmly to the machine so the bezel and the cover of the machine so the bezel and the cover of the unit are touching an tighten all four screws.
9. Installation of the new controller is now complete. Apply power to the machine and the display will then ask for the date and time to be entered (MM DD YY HH MM). Key in the appropriate month, day, year, hour and minutes (military time).
10. The controller will then alternately display the prompt "ENTER PASSWORD" with the time and date. Type in the letters of the maintenance password which is "ULTRAMAIN" and press the "ENTER" button. The unit will now be unlock and ready to program. Each time a controller is replace, it is necessary to change the user password to match the one in the old controller.
11. Press "SELECT, 65, ENTER". The message "CHANGE PASSWORD" will appear on the screen to which you answer "YES" and the words "ENTER NEW PASSWORD" will then be displayed. Simply type in the letters of the password you wish to use and "ENTER".
12. It may be necessary to put the configuration code back into the controller. Each unit will have a different configuration code according to model of unit. To determine what the configuration of this specific unit should be by the sum of its features:
    • Printer: 128 Dosimetry: 4
    • UVB Lamps: 16 UVB Sensor: 2
    • UVA Lamps: 8 UVA Sensor: 1
    • Example: A full body unit equipped with: UVB lamps and UVA lamps plus dosimetry and both sensors has a configuration code of 31. Push: "SELECT, 66, ENTER". The word "CONFIG=" will appear. Key in the configuration number and press "ENTER". Through the configuration the computer is told what features are available to be used in the parameters of a treatment.
13. The new controller must also be recalibrated to reflect the calibration values of the old control unit. This procedure is covered in the user manual under CALIBRATION. If a meter is not available to you then use the output numbers from the last time the machine was referenced.
14. Once the desired select codes have been accessed and altered to the specific needs of the user, the computer should be locked and then unlocked with the user password. The ULTRAMAIN password should only be used to unlock the computer when it is desirable to change the value of a select code.

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