CAT Problem in FT1000MP - Replacing Control Circuit

The 1000MP at my local school station seems to have a problem with the CAT control circuit. It simply does NOT talk to the computer. I know that all parameters, PC and cable are OK as when I plug the same cable and computer on another MP everything is working fine. I also know that the radio was working OK 2 years ago when I used the CAT control with a contest software. Does anyone have the circuit diagram of the CAT interface (manual is not helpful)? Has this ever happened to anyone else? If yes how did you solve the problem? I know that the CAT interface is on a big PCB which seems easy to replace as all cables are inserted with slot on connectors on the board. Does anyone know where I can perhaps get a whole replacement board containing this module if there is no other solution and how much it approx. costs.
Best regards Marios 5B4WN


Solution: Assuming it is the rig's cat port that is blown and not the computers.....Past users that have had failed CAT serial port chips reported:

1: Schematic part is Q5006, ADM232LJR. That is an Analog Devices part; package 16pin, SOIC Wide (0.300 inches).
Printed circuit board should be marked near where the cat port connecter is mounted for this IC.

2: Replacement from Maxim would be MAX232CWE same package as above.

3: Several have done this replacement themselves. Standard chip replacement soldering techniques. Wouldn't be a bad idea to put a socket there, and have a few spares to make future change out easy.

Searches for ADM232LJR:
http://www.intersil.com/design/rs232/xref5v.asp

http://www.egm-electronics.com/listen/ic.htm

http://www.analog.com/int-pro/cross.html

Searches for MAX232CWE:
http://www.3etech.com/pnlist.htm

 
Have heard a rumor that the FCC is pursuing the idea that manufactures of ham rigs make them emp proof. That would also help prevent lighting and RFI damage to components connected to external wiring.... such as this danged cat port chip that blows like fuses... hi hi. 73 from Bill - WD8ARZ

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Past users that have had failed CAT serial port chips reported:

1) Schematic part is Q5006, ADM232LJR. That is an Analog Devices part; package 16pin, SOIC Wide (0.300 inches).
Printed circuit board should be marked near where the cat port connecter is mounted for this IC.

2: Replacement from Maxim would be MAX232CWE same package as above.

I think I posted the above some time ago. It was for the MarkV. I am not sure if the MP uses the exact same part, package wise. The one quoted above is a surface mount package. Therefore a socket is not an option. I would not recommend attempting the replacement unless you are an experienced technician with the right equipment to work with these parts. W8GUS
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Did a double check Ron, and the Service Manual lists the part in the way listed below. So that would make the MP and the MkV the same. It is mounted on the Control Unit Printed Circuit Board.

I will have to open mine up and do an eye ball on the physical space available. Don't mind changing surface mount stuff, and if I can get a socket there, I sure will pursue an adapter to make this one pluggable.... especially now that I am considering putting an amp back online using a non beam antenna.... hi hi Wouldn't be surprised if there is a direct chip replacement for one that will have pins for a socket. Otherwise, could mount the same original type chip in a socket that plugs in a socket added to the pcb if the space is available. Socket might need some non electrical adhesive to secure it and take the load of the solder pads.

If not, then an external optical isolator would be highly recommended for this connector!

Over the past few years I see several entrees on this topic, with the same sharing of information for this chip. More than the display parts.... hi hi. 73 from Bill - WD8ARZ