Electronics > Repair

Sony Discman D-FJ401 Repair (How do I open this thing?)

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Rooster Cogburn:

--- Quote from: tooki on January 11, 2025, 11:22:02 pm ---Can you share some pictures of the outside of the hinge, in both open and closed positions?

--- End quote ---

Closed you can't see anything from the outside and there are two pictures of the hinge open from the outside in the batch I just posted.


--- Quote from: tooki on January 11, 2025, 11:22:02 pm ---I suspect that the design of the hinge is such that it guides the hinge into those triangular slots on the base to stabilize it when open, and that stabilization is what prevents splaying the hinge to remove it. Consequently, I further suspect that the hinge must be spread open in the closed position (or mostly closed), because only when open can the hinge spread into the wider part of the triangular slot.

--- End quote ---

I think that is correct, and when trying to remove it I did it with the lid half-closed. I suspect that is why the service manual recommends removal of the springs since with them installed you can't hold the lid half-closed. But like I said, even with extreme force and causing significant damage I was only able to pop out one of the hinges. The right one that has most of the plastic damage was me trying to remove it as well after I popped out the left one. It don't see how it's possible to remove it without completely destroying it and likely also tearing the flat flex cable going through the hinge :/

tooki:

--- Quote from: Rooster Cogburn on January 11, 2025, 11:52:32 pm ---
--- Quote from: tooki on January 11, 2025, 11:22:02 pm ---Can you share some pictures of the outside of the hinge, in both open and closed positions?

--- End quote ---

Closed you can't see anything from the outside and there are two pictures of the hinge open from the outside in the batch I just posted.

--- End quote ---
My response was posted after you posted those images, so clearly they do not contain the angles I want to see, or else I wouldn’t have asked.

Please show the hinge from the side, not the top. Open and closed.


--- Quote from: Rooster Cogburn on January 11, 2025, 11:52:32 pm ---
--- Quote from: tooki on January 11, 2025, 11:22:02 pm ---I suspect that the design of the hinge is such that it guides the hinge into those triangular slots on the base to stabilize it when open, and that stabilization is what prevents splaying the hinge to remove it. Consequently, I further suspect that the hinge must be spread open in the closed position (or mostly closed), because only when open can the hinge spread into the wider part of the triangular slot.

--- End quote ---

I think that is correct, and when trying to remove it I did it with the lid half-closed. I suspect that is why the service manual recommends removal of the springs since with them installed you can't hold the lid half-closed. But like I said, even with extreme force and causing significant damage I was only able to pop out one of the hinges. The right one that has most of the plastic damage was me trying to remove it as well after I popped out the left one. It don't see how it's possible to remove it without completely destroying it and likely also tearing the flat flex cable going through the hinge :/

--- End quote ---
You were still going at it from the inside. But what I suspect is blocking the hinge is the long hinge sections, such that you’d need to spread them apart from the outside while closed, because those hinge sections rotate down and out when closed.

tooki:
One other thought: use a hot air gun with a small nozzle to CAREFULLY, GENTLY heat the plastic to make it a tiny bit more flexible. You’d be surprised how big of a difference it can make, even when heated far less than needed to soften the plastic.

Rooster Cogburn:

--- Quote from: tooki on January 12, 2025, 12:06:31 am ---One other thought: use a hot air gun with a small nozzle to CAREFULLY, GENTLY heat the plastic to make it a tiny bit more flexible. You’d be surprised how big of a difference it can make, even when heated far less than needed to soften the plastic.

--- End quote ---

Didn't think about that, interesting idea. My hot air starts at 100C, actually seems to be 80C, so that should be safe enough.


--- Quote from: Simmed on January 12, 2025, 12:16:53 am ---ifixit has a similar pic

https://www.ifixit.com/Teardown/Sony+CD+Walkman+D-NF430+Teardown/1249

--- End quote ---

I wish! This is how dozens of other models of Discman look like. Do you see how the screws are angled and relatively shallow? That's how it should be. On this particular model they face straight up and are deeply recessed. I've never seen this on any other model of discman.

Rooster Cogburn:

--- Quote from: Simmed on January 12, 2025, 12:37:55 am ---here is a totally insane idea since there is no other way
how about opening 2 holes on the closed lid just to reach the screws

--- End quote ---

Sure, that would do it. But I can't imagine drilling holes or heating up plastic is the intended procedure. The service manual doesn't exactly show a drill or a hot air gun.

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