Kepco JMK 15-6 rear connector pinnout - Page 1
Forum section: electronics / testgear

author: PerpetualWalnut
author_rank: Contributor
timestamp: September 19, 2022, 04:04:56 am
content: I have an old Kepco JMK 15-6 without any info on the rear connector. I can't find any info on it online either. So I dug into the circuit and did some minor reverse engineering and a lot of brute force trial and error to figure out mostly what it does and it's quite simple, but necessary to connect it correctly to use it as a general purpose bench supply. I'll list the pinnouts that I found with a brief description of what I think it does for anyone else with one of these.PIN 1: Frame Ground.PIN 2: BlankPIN 3: NCPIN 4: NCPIN 5: NCPIN 6: Internal Capacitor Bank (-)PIN 7: Output (-)PIN 8: Front Panel Voltage Pot connected to PIN 7 through I diode.PIN 9: NCPIN 10: NCPIN 11: Connected to PIN 14. Not sure what it does.PIN 12: NCPIN 13: Connected to front panel Voltage PotPIN 14: Connected to PIN 11. Not sure what it does.PIN 15: Output for Current Limit. Used as current source with Voltage Pot to make reference voltage for output regulation.PIN 16: Voltage Limit? Applying any voltage here limits the output voltage and makes front panel lights switch from CURRENT mode to VOLTAGE mode.PIN 17: Not sure, but connecting to Output (+) gives a boost in max voltage from 15V to ~17.75VPIN 18: Internal connection to Output (+)PIN 19: Internal Capacitor Bank (+)PIN 20: Not sure.PIN 21: Output Voltage Control. What ever voltage goes in here, comes out of the supply.PIN 22: Internal connection to Current Pot and Current ShuntPIN 23: An output from the voltage control amp? Not sure.PIN 24: Blank.In the image attached, the red wires are the connections I made to make the power supply work. The front lights only switch when sending a voltage to PIN 16.Hope this helps anyone else who decides to take a wack at one of these with no other info! Good luck. And if you have any info, please post it!

author: coromonadalix
author_rank: Super Contributor
timestamp: September 19, 2022, 10:57:11 am
content: not sure its the same with the ATE series, the ATE series have schematics floating around ... the 3/4 rack i haveNormally it was a short plug screwed on the back for normal operation, i myself had to make some shorts too to make it work, since i did not have this plug i soldered an idc connector instead ....they have a tendency to use the same connector on many models, but you have to check to be suresome infos who could be helpfulhttps://neurophysics.ucsd.edu/Manuals/Kepco/ATE%206-10M.pdfhttp://manuals.repeater-builder.com/te-files/KEPCO/KEPCO%20ATE%2036-3M%20Instruction.pdfhttps://neurophysics.ucsd.edu/Manuals/Kepco/BOP%2036-6M%20Power%20Supply.pdf

author: alm
author_rank: Super Contributor
timestamp: September 19, 2022, 01:18:30 pm
content: I'm missing remote sensing connections, which would normally be adjacent to output terminals. Maybe pin 8/17? The connections for the capacitor bank are so you can choose if you want to connect the output capacitor or leave it disconnected for faster programming speed / current limiting. I would also suggest looking at other power supplies to see what kind of connections they have.I couldn't find the pinout for the connector that mates to PC-12 of the ATE (they strip schematics out of the manuals on their website), but here's the pinout for the connector mating to PC-12 of the more complicated four-quadrantKepco BOP.I have a copy of the Kepco Power Supply Handbook from 1965. It describes the design and theory of designing power supplies in 1965. As appendix, it includes simplified schematics of a number of their power supplies. I don't know if any of them is similar to the JMK, but just in case I scanned those pages and attached them as PDF.