| Products > Test Equipment |
| HP LCR/LCZ Comparator Handler Interface Recreation: 16064A |
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| ZGoode:
More pictures due to the 8MB file limit |
| TERRA Operative:
What's the exact size of the PCB? I'll stitch it together in Photoshop to make a shape-corrected image of the PCB. (If you have a heatgun, it would make short work of removing the centronics connector). |
| TERRA Operative:
--- Quote from: ZGoode on June 17, 2024, 07:12:03 am ---The 2 weird parts not off the shelf are the 2 HP labelled IC's. I could not find anything at all for these components anywhere on the internet, as far as I can find, they don't exist anywhere else. Based on the capacitors and resistors setup around them I am under the assumption that they are some kind of comparator or amplifier, but have not confirmed that yet. - 1x 900 602 8828 - 1x 900 577 8834 --- End quote --- Those two, the '8828' and '8834' are the date codes (28th week of 1988 and 34th week of 1988). So the part number would probably be some combination of 900 602 and 900 577. Sometimes a first digit will be dropped due to space constraints on a small part, so the part number could be something like 1900-0602 etc (HP part numbers are in the xxxx-xxxx format). It looks like 1900-xxxx part numbers are diodes, 1901-xxxx looks like discreet semiconductors like diodes and LED's etc. Integrated circuits and transistors seem to be 18xx-xxxx part numbers, with integrated circuits being around 182x-xxxx. Looking at the passive components and stuff around them, maybe either opamp's, optocouplers or voltage regulators maybe? |
| ZGoode:
Yeah, I tried looking up different combinations of 900-602 and 900-577 with no luck. They could also be voltage regulators or optocouplers as you suggest, I just assumed opamps due to the oddly specific resistor values surrounding them. I got a delivery of new transistors today to try to get my 4277A power supply up and running again. If the transistors do the job, I can plug the handler into my unit and test it, since I already have the replacement interface card from JLCPCB assembled and ready to go. I do have a heat gun, but I'm worried about scorching the board since the only one I have with a high enough wattage for this gets super hot. And it isn't like this is an easy board to find a replacement for. I don't have a temperature-controlled one with enough power to remove the connector. |
| Kean:
Desoldering a connector like that with joints on both sides is a pain. A perfect use case for Chip Quik alloy with low melting point. You want to use braid to remove all existence of it afterwards. Pity it isn't cheap. https://www.chipquik.com/store/index.php?cPath=200 Otherwise I would cut the old connector off (e.g. Dremel), desolder the left overs, and replace it with a brand new one when done. A similar Centronics connector shouldn't be too hard to source. |
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