(Topic ID: 272466)

F-14 Tomcat: Sys 11A 10 Diagnostic Flashes

By Brewchap

3 years ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 3 years ago by Brewchap
  • Topic is favorited by 1 Pinsider

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#1 3 years ago

I have a new to me F-14 Tomcat that I get 10 diagnostic flashes. I do know that means there is a problem with U27 ROM or its associated components and connections. I replaced the ROM today and still get the 10 flashes. I removed all connections except 1J17 and still get the flashes. So now I am at the point that I need to check the associated components, but I don't know what they are. I have never worked on any system 11 boards.

I believe that the guide that I'm working with is Clay's guide, but it don't go into depth on this subject, other than working with a dead board. I do have a logic pin and a Radio Shack probe style oscilloscope and would very much love knowing how to work on this board.

I'm going to double check the power supply, but what should I check other than that?

20200706_181407 (resized).jpg20200706_181407 (resized).jpg

#2 3 years ago
Quoted from Brewchap:

I have a new to me F-14 Tomcat that I get 10 diagnostic flashes. I do know that means there is a problem with U27 ROM or its associated components and connections. I replaced the ROM today and still get the 10 flashes. I removed all connections except 1J17 and still get the flashes. So now I am at the point that I need to check the associated components, but I don't know what they are. I have never worked on any system 11 boards.
I believe that the guide that I'm working with is Clay's guide, but it don't go into depth on this subject, other than working with a dead board. I do have a logic pin and a Radio Shack probe style oscilloscope and would very much love knowing how to work on this board.
I'm going to double check the power supply, but what should I check other than that?
[quoted image]

There is a massive amount of alkaline damage and residue on that board and is almost certainly the root cause of your problems. I'd suggest you consider sending it out to someone like Jerry Clause (I don't know if he's on here or just on the Facebook Repair Help Group), Chris Hibler or any of the others that do / would be willing to take this on. That's pretty bad looking and I hope they can save it.

#3 3 years ago

If you come up with the contact for him, I would appreciate it too. I have an F-14 board that had the same issues and I would like to get the original board working again, as the audio is better than the rottendog replacement I have in there now

#4 3 years ago
Quoted from Coyohtay:

If you come up with the contact for him, I would appreciate it too. I have an F-14 board that had the same issues and I would like to get the original board working again, as the audio is better than the rottendog replacement I have in there now

I know chuckwurt has dealt with Jerry before so you might want to PM him for his contact info.

#5 3 years ago

FYI, Jerry Clause's e-mail is dragster_73 AT hotmail.com he's usually quick on turnaround and does good work, hopefully he or someone else can help you guys out.

#6 3 years ago

Thank you, I sent the board out for repair.

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