Electronics > Repair
Fluke 5440B repair
leighcorrigall:
--- Quote from: Rax on July 17, 2024, 04:57:07 am ---
--- Quote from: leighcorrigall on July 11, 2024, 05:13:31 pm ---If you have another 5440B that you do not mind opening, I would suggest swapping those cards, including the transformer, to see if you can isolate the problem.
--- End quote ---
This may be my shortest path to success, as I do have my 5440A, and they're very very similar, if not outright identical (other than the display board). In fact, I seem to recall I identified a couple other less know differences going by just the SMs, which may be documented in my 5440A thread.
In any case, I need to collect some guts to begin such an endeavor, as maneuvering two behemoths like these guys are are not for the faint of heart (or people liking theirs backs working OK). I need to wrestle them in a way where I could have both open side by side, and this in my cramped workshop will be tough.
--- End quote ---
I have reviewed the manual and seen enough teardowns to agree with you that there are very few differences between the A and B versions. The rear interface panels are different, too.
Be careful. The plastic handles are prone to breaking and should not be used for moving the unit. I move the instrument by sitting it on an office chair and moving it around my office when I need to work on it. One of my long-term goals is to replace these handles with steel equivalents so that I don't have to worry about breaking something off. My 5440B will be with me for a long time because it is tremendously reliable and has excellent specifications.
Rax:
--- Quote from: leighcorrigall on July 17, 2024, 01:38:35 pm ---One of my long-term goals is to replace these handles with steel equivalents so that I don't have to worry about breaking something off. My 5440B will be with me for a long time because it is tremendously reliable and has excellent specifications.
--- End quote ---
If you ever get to, I dunno, generate some cnc files (or other machining) you can share, or maybe have a few more made, I'd gladly get that if you're willing to share. Cover costs, etc, of course.
leighcorrigall:
--- Quote from: Rax on July 18, 2024, 12:12:33 am ---
--- Quote from: leighcorrigall on July 17, 2024, 01:38:35 pm ---One of my long-term goals is to replace these handles with steel equivalents so that I don't have to worry about breaking something off. My 5440B will be with me for a long time because it is tremendously reliable and has excellent specifications.
--- End quote ---
If you ever get to, I dunno, generate some cnc files (or other machining) you can share, or maybe have a few more made, I'd gladly get that if you're willing to share. Cover costs, etc, of course.
--- End quote ---
If you are suggesting that I make a CAD model, I have already done so. Merry Christmas.
I have not formally shared them on EEVBlog because I still have to confirm the dimensions. It should be a near-identical copy.
Please let me know if I should pursue this. The material selection should also be correct. We will have to think about that.
EDIT:
According to the service manual, the handles are as follows:
Table 5-1 (5440B Final Assembly) and Table 5-2 (5440A Final Assembly)
Reference Designator, Description, Stock No., Supply Code, Part No., Quantity
MP 2, Corner Handle 8.75", 656199, 89536, 656199, 2
MP13, Corner Handle 8.75", 656199, 89536, 656199, 2
A private conversation with Rax confirms that these handles are interchangeable between the Fluke 5440A and the 5440B.
A single part (656199) can be used on all four corners because of the symmetry.
Rax:
The other things I'd like to see as a 3D print file is the spacers used inside these 5440s (see pic). I'll dig up the part number and real name, but anyone having opened one of these has stumbled upon these little knoblets. They become very brittle with time, and I have not run into the situation where I'd pull them with "no victims" in a new unit having landed at my desk.
I'll give a shot to making some 3D files for this and see what comes out.
Tony_G:
Random question Rax, did you replace/check the relays? One of my 5440s Fluke rejected for cal due to relays and I've never got around to addressing.
Just wondering,
TonyG
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version