Ultrasound Scanners for Veterinarians - FarmScan L+ /Need help repair/ pinout    - Page 1
Forum section: electronics / repair

author: DK ekectro
author_rank: Contributor
timestamp: February 17, 2025, 07:58:15 pm
content: Greetings to all members!I need some help.It is a device used by veterinarians when examining animals.A special ultrasonic probe is connected to this device via a 30-pin connector. The problem is that the cable was pulled out of its connector from that probe and now I have a problem with identifying which wire belongs to which pin since all the wires are the same color and without markings. On the motherboard of the scanner where the second, female, part of the connector is soldered, there are also no markings.That probe in the middle of the cable has a board with electronics and there are some markings on it where the wires are connected. I managed to identify only the markings H1-H16 and +5V to which pins of the connector they belong. Other markings such as D1/CT1, D3/CT3, CK, D0, D2, LE/, +HV, -HV I cannot figure out where they must be connected on the connector because there are no such markings on the scanner's motherboard itself, and I cannot find the schematic of the device anywhere.There is one chip on the board from the scanner and as far as I have been able to examine many pins from the probe lead to it, but according to the marking on it, I cannot find information about what kind of chip it is, so I need help with that as well.Model of Linear Probe is LP6.5-80 6.5MHz.Thanks!

author: t1d
author_rank: Super Contributor
timestamp: February 23, 2025, 04:25:46 pm
content: Looks like FarmScan Ultrasounds are manufactured by BMV. Here's a link:https://www.bmv-vet.com/en/contactOne odd source of information that I discovered is Ebay sellers that have the same or similar items. I have contacted some, before, for information that I needed and, as a seller, I have also provided information to people in need. If you can find a sympathetic soul that will help you, maybe they can make a drawing, or take some pictures.Also, Defpom on YouTube has had videos on repairing some farm-type items. He is also here, on this forum. You might try reaching out to him, for help, leads, or ideas.Just trying to think creatively. HTH.

author: DK ekectro
author_rank: Contributor
timestamp: February 24, 2025, 11:19:33 am
content: Thank you very much for your effort and response. I'll try to contact that person you recommended.It would mean a lot to me if I could find a schematic diagram for that device or the probe itself, and I believe that it would help other service technicians a lot since it is a fairly widespread and expensive device.

author: voltsandjolts
author_rank: Unknown
timestamp: February 24, 2025, 12:20:32 pm
content: Finding a schematic is very unlikely, as is finding someone willing to take apart a (valuable) working unit to provide the information you need. You may need to purchase another new/used item that you can copy from. If you are lucky, maybe a cheap non-working unit will pop up on ebay, with a different fault to the unit you have. Good luck.

author: DK ekectro
author_rank: Contributor
timestamp: February 24, 2025, 12:34:37 pm
content: You are 100% right about that. Since the scheme is impossible to acquire.I've just sent a message to Defpom if he has the will to investigate this problem of mine.If I don't succeed, I'll tell the customer that unfortunately he will have to buy a new probe that is not cheap at all.Thank you for your help and for your time!

author: DK ekectro
author_rank: Contributor
timestamp: February 25, 2025, 07:49:16 am
content: I just want to ask if anyone knows information about this IC that is in the attached picture. It is P49AD, and according to that, the only information it offers me on the Internet is that it is a TTL IC 74LSxxx, but it has 14 pins, while this one has 20? Thank you all in advance!

author: voltsandjolts
author_rank: Unknown
timestamp: February 25, 2025, 08:58:57 am
content: 74LCV245 with OE and DIR pins tied low, so just being used as a buffer, AFAICT

author: DK ekectro
author_rank: Contributor
timestamp: February 25, 2025, 09:14:44 am
content: Thank's!

author: CaptDon
author_rank: Super Contributor
timestamp: February 25, 2025, 02:59:54 pm
content: Can I guess that with that many wires the probe has multiple 'cells' as opposed to the probe version that uses a single detector that wiggles back and forth inside the housing? Sadly, with all of the wires being the same color you would not only need the probe schematic but would have to trace out and verify each wire from source within the probe to destination at the connector. Depending on how the probe is sealed this may be an impossible task? I would assume since these probes are used with a sound conducting gel the probe head wire connections may be sealed and impossible to determine orientation. I wish I could help but this really does look like an uphill battle.

author: DK ekectro
author_rank: Contributor
timestamp: February 25, 2025, 04:11:19 pm
content: I managed to follow all the pins from the female connector that is on the device itself to where it leads on the board thanks to an old Tektronix TX3 multimeter that has an incredibly fast continuity mode, so at least I managed to figure that part out quickly, but in the end it's not really worth it when half the markings are unknown to me