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54501 Power Supply Schematic
开云体育Did we recap the fucker?
With these Boeschert cartridges, usually you need to gib the caps
first. Then, wash the remaining electrolyte from the top of the
PCB and the bottom, as the creep currents can fuck up the three
terminal regulators.
Tam With best regards Tam Hanna --- Enjoy electronics? Join 8300 other followers by visiting the Crazy Electronics Lab at On 07.10.2018 16:34, Mark Whitmore
wrote:
I need to fix a dead power supply for my HP 54501.? Is a schematic available anywhere on Earth? |
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Mark? All anticdotal evidence says that the supply was not manufactured by HP but is instead a 3rd party drop ergo no HP schematics were ever released. As near as I can tell It supplies -/+ 5v, +/- 12v (2 buses), +15v, +3.5v. you might try taking it apart and looking for original asian manufacturer and model number and back track it that way. Or even reverse engineering it. The above have produced some results on other HP gear of the 90's era. Dave Artekmanuals On October 7, 2018 at 10:34 AM Mark Whitmore <m.e.whitmore@...> wrote: |
开云体育Hello, not Asian, but Boeschert.
With best regards Tam Hanna --- Enjoy electronics? Join 8300 other followers by visiting the Crazy Electronics Lab at On 07.10.2018 18:23, Artekmedia wrote:
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What Tam said. You might even have to unsolder one of the trimpots near the forest of electrolytics to clean under it.? I used the DMM on ohms to check for conductivity between traces - one probe to a pad and drag the other around on the solder resist.? You'll be surprised how far the electrolyte contamination goes, giving readings in the 100s of KOhms to MOhms.? The contamination is invisible. Here is the list of caps I used: Index Quantity Part Number Description Customer Reference Available Quantity Backorder Quantity Unit Price USD Extended Price USD 1 14 565-1823-ND CAP ALUM 1000UF 20% 35V RADIAL 14 0 0.81900 11.47 2 2 565-1589-ND CAP ALUM 2200UF 20% 35V RADIAL 2 0 1.49000 2.98 3 1 565-1297-ND CAP ALUM 2200UF 20% 16V RADIAL 1 0 0.83000 0.83 4 3 565-1766-ND CAP ALUM 6800UF 20% 10V RADIAL 3 0 1.76000 5.28 The big primary side caps are probably OK. The same power supply was used in the 1650B; they were plentiful and cheap on ebay, but such a supply will also die eventually, so you might as well fix the one you have. There is more information and a hand drawn reverse engineered schematic here: These supplies were used in many of the 545XX series oscilloscopes as well as at least the 1650B logic analyzer.? You have to search under 54501A, 54502A etc. to find the information.? Mine is a 54510A. On Sun, Oct 7, 2018 at 7:38 AM Tam Hanna <tamhan@...> wrote:
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Mark Whitmore
开云体育Many thanks to all for the replies.? Several years ago I repaired the same P/S in my 54502A using reverse engineering. brute force, and dumb luck but it took me weeks to do.? Recently the the supply in the 54501 failed and I discovered that it was identical to the 54502 so I swapped them since the 54502 had other problems.? Now I want to get the 54502 going and the P/S is the first step.? I will look at the 54542 schematic that Joe provided and see if it is similar to what I remember of the 54502.? Have not re-caped the sucker but will look into that approach after poking around a little.? The years ago failure turned out the be a shorted rectifier diode supplying the + (or might have been -)? 12 VDC.? I have a vague recollection of these power supplies being manufactured in Ireland or maybe Holland.Regards, Mark On 10/7/2018 12:31 PM, Tam Hanna wrote:
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开云体育It was actually a 54503 schematic that helped me with my 54542. ? Joe ? From: [email protected] [mailto:[email protected]] On Behalf Of Mark Whitmore
Sent: Sunday, October 07, 2018 11:57 AM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] 54501 Power Supply Schematic ? Many thanks to all for the replies.? Several years ago I repaired the same P/S in my 54502A using reverse engineering. brute force, and dumb luck but it took me weeks to do.? Recently the the supply in the 54501 failed and I discovered that it was identical to the 54502 so I swapped them since the 54502 had other problems.? Now I want to get the 54502 going and the P/S is the first step.? I will look at the 54542 schematic that Joe provided and see if it is similar to what I remember of the 54502.? Have not re-caped the sucker but will look into that approach after poking around a little.? The years ago failure turned out the be a shorted rectifier diode supplying the + (or might have been -)? 12 VDC.? I have a vague recollection of these power supplies being manufactured in Ireland or maybe Holland. On 10/7/2018 12:31 PM, Tam Hanna wrote:
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