Electronics > Repair
HP 6177C DC Current Source Repair and Restoration (COMPLETE)
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motocoder:

--- Quote from: Ordinaryman1971 on June 13, 2020, 02:54:41 pm ---And the Ko4BBB manual for HP6177c

--- End quote ---

Great! Thanks for posting.
DJ_Rix:
Hi, i have bought this great psu recently. I am struggling with knob disassembly, hex screws are that tight that i slipped two imbus keys with no luck to unscrew. Any advise how to unscrew them ? Except drilling them out :D
HighVoltage:

--- Quote from: DJ_Rix on June 14, 2023, 04:33:14 pm ---Hi, i have bought this great psu recently. I am struggling with knob disassembly, hex screws are that tight that i slipped two imbus keys with no luck to unscrew. Any advise how to unscrew them ? Except drilling them out :D

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Use a fitting torx instead, they are usually a little tapered and when pressed into the hex, they will not slip.
That is how I removed screws that looked impossible to loosen up.
 
TimFox:
"Helipot" turns-counting knobs often use spline setscrews, rather than hex.
New knobs usually came with appropriate spline wrenches.
https://www.mcmaster.com/products/wrenches/l-keys-9/for-drive-style~6-flute-spline/?s=spline+wrenches
Stray Electron:

--- Quote from: DJ_Rix on June 14, 2023, 04:33:14 pm ---Hi, i have bought this great psu recently. I am struggling with knob disassembly, hex screws are that tight that i slipped two imbus keys with no luck to unscrew. Any advise how to unscrew them ? Except drilling them out :D

--- End quote ---

  Be aware that some of those small HP knobs require a 0.050" allen wrench and not the slightly larger 1/16".  Also people occasionally put a second set screw on top of the first so make sure that the set screws don't loosen up. That's not common in electronic knobs but it is in larger mechanical assemblies and it's possible that someone did it to your knobs.
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