Schematic for 6-14077

Hopefully someone will come up with something, but if not I don't think it would be hard to do some DIY troubleshooting.  Given its age and size, the components ought to be accessible and you should be able to read the part numbers.  Then given its simple functionality, you could infer what signals or lack thereof would cause the entire display to fail.  Can you post photos of the guts of the board with enough resolution to show part numbers?

Exactly what failed, all of the displays?

Yes, all of the displays which require DC voltage to function. The circuit board appears to be well made and fairly rugged. I suspect a DC power supply component has failed, but which one and where is it on the board? I do not see any test points or voltages. I can try taking a photo of the board if it will help. Thank you both for responding.

I use to repair antique radios as a hobby, so I have some knowledge of electronics. At least I was able to obtain schematics for those old radios from the public library.

If you take some detailed photos of each side, we may be able to give you some clues as to where to start.

 Thanks again. I will try to take and post some photos tomorrow. We are leaving for a 4th of July picnic shortly.

No hurry.

Is there a 9 volt battery in it?

Ken M

Yes there is, an 8.4 volt rechargeable NiCad. It checks out OK. According to the user maual, its function is to keep the display working during the shut down process during which the display reads "OFF" for approximately 20 seconds. 

I am working on the CB photo. I have been busy with higher priorities. Hope to get to it this week end.

Thanks to all for your help.

Sorry to be so late with my response, but I have located a local technician who repairs train boards and small consumer appliances who wants to take a shot at repairing this. I will let you know how it goes.  

Any updates?