QZE Technologies

Dexter and Continental Gibau Stack Dryer Computer Controller Troubleshooting Repair Problem Solver

Applies to 9857-147-xxx  9857-133-xxx  9857-127-xxx  DL2X30  DDAD30  DDAD50

Suppose you or your mechanic have done all the troubleshooting on your stack dryer for a particular problem and have determined the most likey cause to be the computer. The next step might be to ship the defective part to your favorite repair shop, but before you do, it might be worthwhile to do a little more troubleshooting on the computer. The following discussion can save you money and down time.

The manuals might not cover all the fault codes nor all the fixes so read carefully while we discuss them in detail.

F1 FAULT CODE: TEMPERATURE SENSOR (THERMISTOR) SHORTED

Could also be an electrical short in the thermistor curcuit. If the error appears on both the upper and lower display, then the problem is most likely on one of the boards since it is unlikely to have two bad thermistors. If you disconnect the cable at P4, the error should change to F2, if it does, the boards should be okay, otherwise the boards will need servicing.

F2 FAULT CODE: TEMPERATURE SENSOR (THERMISTOR) OPEN

Reconnect P4 and push down on wires where they connect to P4. If the problem goes away then you have a contact problem. If you short either of the outer wires on P4 to the middle wire, the error should change to F1. If it does not, then you have a board problem that will require service.

F3 FAULT CODE: ELECTRONIC CONTROL FAILURE

Check grounding. Otherwise it is usually caused by a defective chip. Boards will need servicing.

F4 FAULT CODE: MICROCONTROLLER CIRCUIT PROBLEM

Oftentimes resolved by taking steps similar to those taken for F3. Boards will need servicing.

F5 FAULT CODE: GENERAL VOLTAGE PROBLEM

Oftentimes resolved by removing the coin battery, cleaning the holder and/or replacing with a fresh battery. If this does not resolve problem, then boards will need to be sent in for more extensive testing.

OTHER POSSIBLE ITEMS OF CONCERN

If you are having problems with your membrane switches, ie buttons, the first thing you might want to try is removing the ribbon from the connector, gently clean with alcohol and tissue, then reconnect. Oftentimes replacing the membrane switch assembly is unnecessary.

Also be aware that odd problems can sometimes be resolved by reprogramming to the default parameters and trying things out. In programming mode simply press the lower HOT, then lower MED over and over (HOT,MED,HOT,MED…) until you are taken out of programming mode and reach the main start screen. If things look okay you can then go back into programming mode and reprogram the vend, time, etc to whatever you need. Also, do not think that the green ground wire is optional. Make sure that it remains attached to the frame.

For your added convenience, we would like to provide additional Dexter documentation that might prove helpful. Just click here for more detail.

I hope this helps, but if all else fails, we do offer a repair service. we can oftentimes repair computers that others have scrapped as non-repairable.

REPAIR / REBUILD SERVICE

Simply put, our repair rebuild service is superior to any other offered for the Dexter and Continental Girbau Stack Computer / Controller. We understand the intricacies of the circuits better than anyone else claiming to be experts on the repair of these boards,but you do not have to take our word for it. If you have any controllers that have been deemed not repairable by other repair houses, feel free to send them to us. We find that over fifty per cent of the time, we can get these so-called “scrapped” controllers working. The only exceptions or limitations on repair would be bad microcontroller chips which are proprietary and burned out displays.

The connector that holds the membrane switch ribbon in place is obsolete and there is no replacement part on the market, but if you have one that is broken, we have a solution.

After repair, computers will undergo our special stress testing to insure long and trouble free operation.

A special serial number will be assigned to your computer. This is used to reference the history, similar to the health record your doctor maintains.

A quality refurbishment yields quality results that will pay off over time. You will come back to us time and again, because as they say, the proof is in the pudding.

For more repair information click here