| Electronics > Repair |
| Agilent 53132A Counter Repair (FIXED and Upgraded) |
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| HighVoltage:
--- Quote from: TheSteve on February 05, 2016, 09:18:22 pm ---The entire time I just kept hearing Shahriar in my head saying "Follow the signal path" lol. --- End quote --- Yes, I know what you mean, I learned so much from Shahriar' repair videos, he really is a master at this. --- Quote ---btw, the previous person that did the rework has some skill but not really enough to do a proper job. The soldering they did is far from excellent and they removed a part or two that there was clearly no need to remove as they can easily be verified 100% good in circuit. They also left the signature amateur calling card in the top of one of the relays in the form of soldering iron melt marks. --- End quote --- If that previous person did not have the skills and / or tools to do the job right, he may even have damaged some of the new components he installed. May be it is a good idea to check them all or replace them properly. |
| TheSteve:
Cleaned up all of the soldering, its starting to look pretty good inside. I do need to order a replacement U44 next week. I've bypassed the chip and while it fails the self tests still it can count on both channels. If I give it the proper level input though on ch1 while booting it passes all self tests - so I'm hopeful a new U44 fixes it. I forgot to mention the other "surprise" I got the with unit. I am sure they just threw a power supply into the main board and then tossed a case on it. On the bottom of the case where it is riveted together you can see a hint of something black on the outside, on the inside it is a different story. It did not come off the 53132A PCB though as its very clean. I assume something leaked from a different board, sure is disgusting looking. |
| TheSteve:
Well I fired up the bread board and tested U44 - it looks and works exactly as an op-amp should so its fine. Back to the drawing board on this one... |
| edpalmer42:
--- Quote from: TheSteve on February 06, 2016, 11:20:27 pm ---Cleaned up all of the soldering, its starting to look pretty good inside. I do need to order a replacement U44 next week. I've bypassed the chip and while it fails the self tests still it can count on both channels. If I give it the proper level input though on ch1 while booting it passes all self tests - so I'm hopeful a new U44 fixes it. I forgot to mention the other "surprise" I got the with unit. I am sure they just threw a power supply into the main board and then tossed a case on it. On the bottom of the case where it is riveted together you can see a hint of something black on the outside, on the inside it is a different story. It did not come off the 53132A PCB though as its very clean. I assume something leaked from a different board, sure is disgusting looking. --- End quote --- Is that black stuff dry like blown capacitor guts or sticky/gooey? In some equipment HP used stick-on rubber feet as spacers to make sure that the board couldn't touch the case. Years later, they found that the rubber feet melted and turned into goo. If that's what you've got, it cleans up easily with IPA. |
| Zucca:
well, after reading this post here my choice: --- Quote from: Nuno_pt on January 24, 2016, 03:17:20 pm ---Ebmpapst 412 12Vdc 0,9W 75mA 6000rpm 10m3/h 18dB --- End quote --- expensive but I saved the shipping in the Digikey order... ^-^ I am pretty pleased with the result. When I fired it up the first time with the new fan installed, I thought I messed up something since I couldn't hear it. Only in a second step I looked at it and saw the fan spinning... ;D Just a head's up, in my PSU the ZD601: had one leg flapping in the breeze. Also the corresponding solder pad below it did not show any sign of proper soldering. My guess is a production issue. |
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