Electronics > Repair
Hioki 3532-50 LCR Repair (One major problem solved, SM still wanted)
KungFuJosh:
--- Quote from: zepto on August 18, 2024, 03:09:42 pm ---I understand, and I did not mean to be dismissive of your efforts. I meant the capabilities of this device aren't really exploited by the touch screen interface. It still has value, assuming an external interface is available, even if the display and touchscreen are completely broken. If you give up, do not throw it away.
I will have a 3531 soon. It is a couple revisions behind your model (3531->3532->3532-50) and has a GPIB interface. Assuming it isn't completely destroyed in shipping, I will write some programs for it. I can share them with you if you are interested.
--- End quote ---
I didn't think you were being dismissive at all. I just doubt I'd use the device much if I can't get it working properly.
I would love to see what you come up with. Do you use TestController at all? It's a great program. If we could add support on there for these devices, that would be awesome.
KungFuJosh:
I just got an original touch panel on eBay for $78 including shipping. It's lightly scratched, but works fully according to the seller. We'll see!
Martin72:
--- Quote from: zepto on August 18, 2024, 03:09:42 pm ---I understand, and I did not mean to be dismissive of your efforts. I meant the capabilities of this device aren't really exploited by the touch screen interface. It still has value, assuming an external interface is available, even if the display and touchscreen are completely broken. If you give up, do not throw it away.
--- End quote ---
This Hioki has a RS232 slot (instead of GPIB), I have made a corresponding cable (25-pin to 9-pin).
It can be controlled with the software that can still be downloaded from Hioki, it even works with Windows 10 without any problems:
https://www.eevblog.com/forum/testgear/schematicservice-manual-for-hioki-lcr-3532-50/msg5238030/#msg5238030
The device “obeys” SCPI commands, so integrating it into the “Test Controller” software environment should not be a problem.
KungFuJosh:
The LCD situation is interesting. It's obviously not terrible in the photos above, but it's not perfect either. The seller has been trying (along with the help of his engineer) to make it better. Today he had me remove R13, and jumper J26. That didn't help, so the engineer wants me to increase the resistor values of R1, R2, R4, R5 from 222 to 302. I had to order an 0805 resistor kit since I didn't have that value on hand, but I should have it tomorrow.
KungFuJosh:
No improvements yet. It appears they were trying to improve the display quality by adjusting the contrast center point.
I figured that out quickly because I tried 3.3kΩ, and it was immediately too high contrast. Switched down to 3kΩ and it was adjustable again, but looked like the attached.
I asked them if there's something else that affects flickering or filtering we could change. Or if they have other ideas. 🤷
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