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Forum section: electronics / repair

author: Kagord
author_rank: Contributor
timestamp: February 23, 2022, 08:20:35 pm
content: Hi,I ordered this motor control board (comes with the console) for a treadmill I'm trying to fix on my own instead of just calling 1800gotjunk. Yes, it's cheap AliExpress. I'm trying to identify what connector goes into the speed and incline sensor connectors. The existing connectors are not like this at all. Is this something I can create (buy a kit) or should I just wire in dupont connectors? Thoughts?The sensor on the motors is this one, I think it's actually going to work:https://omronfs.omron.com/en_US/ecb/products/pdf/en-ee_sx3009_p1_4009_p1.pdfAny advice appreciated.

author: m k
author_rank: Super Contributor
timestamp: March 01, 2022, 04:29:49 pm
content: I think I don't exactly understand what you are missing.Does your board have equal amount of connectors?In picture you have 4 pin connector possibility below marked speed sensor connector.Your link has 3 pin sensor with open collector output.Means that it is shorting output to ground but there are dark and light versions.Can you check the exact type or test its operation?

author: Kagord
author_rank: Contributor
timestamp: March 03, 2022, 11:38:05 am
content: Thanks for the reply.To clarify, my original motor control board has a straight 6 pin connector, 3 pins used for the incline sensor, and 3 pins for the speed sensor. The new, most likely el cheapo, "universal" Aliexpress replacement board I thought I'd take a shot at has two separate 3 pin connectors for each function as shown above.I was able to cut the original 6 pin connector in half and use it as is for the incline, luckily the Vcc, -, and O lined up exactly, and the connector just fit securely after I shaved off some plastic. Despite the well written notes on the picture above "Note: speed sensor not need to connect", I wanted to connect it because it was there. However, for the speed sensor, the wiring did not line up, and I butchered the connector pretty bad trying to get the metal connectors out of the plastic housing (plastic was brittle and falling apart), so I just ended up splicing in dupont connectors, and hot glued to attach and secure them in place. I was just looking for a cleaner solution to find a way to buy these 3 pin connectors in a kit, and that someone on this forum might recognize the socket name and be able to rattle off what it's called. But no need now.It's a 20 year old treadmill with what appears to be some very stout motors, at least they appear to be overbuilt from what they put in treadmills today. So, revived for now, wife is happy, I'm happy, and I saved some landfill waste for a few more years, or longer, hopefully.

author: m k
author_rank: Super Contributor
timestamp: March 03, 2022, 05:13:32 pm
content: The connector is very common and used in many kinds of electronics but I don't know it's name.But the only real reason for the right connector is a steady connection and I guess hot glue is steady enough.In case you want some changes one day new heat shrink joints are pretty small.You still need means for connector soldering but at least cable part is easy.

author: free_electron
author_rank: Super Contributor
timestamp: March 03, 2022, 06:00:14 pm
content: one of the JST family of connectors.

author: Ian.M
author_rank: Super Contributor
timestamp: March 03, 2022, 06:32:45 pm
content: It looks like it *may* be JST-XH. An in-focus closeup at an oblique angle towards the side with the slots, with a ruler for scale behind it would be needed to be certain.Unless anyone knows better, the problem with JST-XH and similar connectors from the hobbyist or occasional prototyper point of view is the ungodly cost of the proper crimping tool. Unlike the duPont clones, which can be somewhat acceptably crimped with an under fifteen bucks SN-28B clone ratchet crimper, even non-ratchet crimpers will set you back the better part of fifty bucks, and barely do the job, requiring crimping the wire and insulation separately, and judging the correct 'squeeze' for the latter.There are plenty of cheap crimpers that *CLAIM* to be suitable for JST-XH, but if you dig into the reviews and forum posts you'll find they almost invariably have dies that are too thick so generally cant crimp the contacts without mangling them, and have bad die profiles and incorrect clearances so there is no sweet spot between getting a tight enough contact crimp to get adequate pull strength, and over-crimping the insulation, snapping strands so the wire is barely holding together.