Trying to repair Armrest controller and need help Identifying component

[Jordantwin]

I have an Armrest controller from a tractor and I'm having trouble identifying a component. I cant read the numbers on the them. Most of them test 2.7k ohms from center to either outside pins and 0 ohms across the outside. I have one that is testing open to the center pin but i don't know what these are.

Pictures are attached and the part number for this controller is 399285A1

[Jordantwin]

I don't know why this picture didn't attach but I'll add it

[Manul]

This is a filter, also called EMI suppression filter. Yours probably contains two feritte beads and a capacitor. Usually for suppression of noise.

[Jordantwin]

That makes sense. Thanks

[harmetp]

Did you ever successfully repair the arm rest controller? Was it just the filter that was bad?

thanks

[SMdude]

What troubles are you having with it?
I have repaired several of these in the past.
One of the more common problems was one or more remote levers not working(even after replacing or swapping the remote module).
It was found that the filter caps on the inputs to the 4053 ic's had shorted due to static discharge and low volt rating of the filter caps.

Cheers

[harmetp]

Right now it goes off line then comes back. When it's working the remotes, throttle, shifter all work fine. The fault codes just say off line. If it was just a bad passive device, I could replace it.

Did you only have to replace caps and/or filters or did it involve pulling IC's (sounds like the 4053 is generic, but I'm not sure all of them are).

thanks

[SMdude]

Ahhh, that one.
Replace the 10mhz(double check, going by memory) smd crystal next to the main microcontroller. If you warm it up a little it should start up and run normally almost straight away. A tell tale sign that it is this is the lights for the difflock and 4wd come on and stay on, whereas they would normally flash on then off when the power was turned on.
I see in the one in the picture in post 1, it is 16mhz, but the one pictured is an older version, which I never had to repair. I suspect yours may be the newer one.

Also the other problem that occurs is the wires in the wiring harness to the armrest can break internally near the plug.
Grab and pull each wire, if one is stretchy, keep going till the insulation breaks, then you know where the break is.
If it is an older New Holland tg255 or equivalent, they had active terminators for the can bus, one at the back behind the back cover and another in the engine bay. These used to get broken solder joints where the pins from the plug soldered to the board. They were the biggest piece of expensive garbage ever used. Eventually these were superseded wit a small plug with 2 resistors to terminate the can bus and were comparatively very cheap. 

Hope that helps!

Cheers

[harmetp]

Thank you. I'm going to mess with the arm rest harnesses tonight. I have a new board coming to get me going again, but I plan to work on the bad board. If it is just a couple of crystals that would be nice.

[SMdude]

Thank you. I'm going to mess with the arm rest harnesses tonight. I have a new board coming to get me going again, but I plan to work on the bad board. If it is just a couple of crystals that would be nice.

Just wondering if you had any luck?
Replacing the board might not directly give you what you need. If it is new, you will need to program it and calibrate, if it was second hand you will need to calibrate the remote levers and hitch control.
Hopefully it was just a broken wire. Normally the broken wire happens only an inch or two below the plug.
If you need any more help with it, sing out. These tractors were my specialty for 11 years.

[harmetp]

I replaced the board and a local independent service guy has the Caseih software and adapter so it's all good for now. I have the software, but my adapter hasn't come yet - it can't be any of my other adapters. it has to be the caseih. When I get some time, I plan to work on the board (find replacement crystals, check continuity of the filters). Hopefully I find something obviously bad.

thanks