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1 Jan 2020 18:06:15 UTC
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#30 - Keithley 614 electrometer repair and calibration
Vintage Keithley 614 electrometer was picked up on eBay as non-working. The unit was repaired and adjusted. The old-fashioned 2-lug triaxial connector on the front panel was replaced with a 3-lug one. The process was explained in some detail.
Discussion: http://www.eevblog.com/forum/testgear/keithley-614-electrometer/
Manual: http://exodus.poly.edu/~kurt/manuals/manuals/Keithley/KEI%20614%20Instruction.pdf
ESI DB-62 resistance decade box: http://www.ietlabs.com/esi-tegam-db62-decade-box.html
Agilent 34401A specs: http://cp.literature.agilent.com/litweb/pdf/5968-0162EN.pdf
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https://www.youtube.com/watch?v=txH6EpqN5V0
Discussion: http://www.eevblog.com/forum/testgear/keithley-614-electrometer/
Manual: http://exodus.poly.edu/~kurt/manuals/manuals/Keithley/KEI%20614%20Instruction.pdf
ESI DB-62 resistance decade box: http://www.ietlabs.com/esi-tegam-db62-decade-box.html
Agilent 34401A specs: http://cp.literature.agilent.com/litweb/pdf/5968-0162EN.pdf
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https://www.youtube.com/watch?v=txH6EpqN5V0
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105-krk-rockit-6-studio-monitor-speakers
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https://www.youtube.com/watch?v=zi94gMmRJ5k
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120-fluke-memory-module-reassembling
In the previous video this original Fluke memory module was taken apart to trace connections on the board and to read FLASH chips. In this episode the module was put back together. BGA reballing demonstrated in the process.
Previous video: https://youtu.be/C1NHDiM2-n0
Forum: https://www.eevblog.com/forum/repair/fluke-199c-scopemeter-repair/
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https://www.youtube.com/watch?v=FdeNznzRVGU
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#115
115-yamaha-p-155-digital-piano-repair
This piano did not power up. The problem was traced to a broken off soldering joint on the power connector. After fixing this problem the piano worked perfectly fine.
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https://www.youtube.com/watch?v=FRuW3TsuDRI
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#71 -
71-zoom-r16-repair
This R16 had a bad SD Card connector. It turned out to have a bent pin, that broke off in an attempt to straighten it out. The part number of the SD Card connector was identified, but no luck finding a replacement part. An attempt was made to solder the tiny pin, which was successful.
SD Card connector data sheet: https://drive.google.com/file/d/1a-h2keKLdUswX2YNMySxKlXlUy4mX5lf
Another R16 repair attempt: https://youtu.be/3QJDH4LFgnQ
Power supply analysis and repair: https://youtu.be/wySRf2b0Low
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https://www.youtube.com/watch?v=fWX0dASnFlA
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#121
121-bird-signalhawk-sh-362s-spectrum
The instrument had a couple of faults: some flicker and jitter on the display, and some noise in the signal in VNA mode mostly visible at lower frequencies. The flicker disappeared after reconnecting some internal connections. The noise was traced to a cracked soldering joint in the VNA module.
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https://www.youtube.com/watch?v=nmXqApz3ETk
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#47 -
47-datron-1071-7-5-digit-multimeter
A vintage metrology grade meter was repaired, calibrated and tested for stability. Not much was wrong with it: a couple of faulty caps, a stuck switch, and corrupt calibration data. The display is bad as well, but usable, so it can be tolerated for now. The loss of calibration is, of course, a big deal since I don't have appropriate equipment to calibrate a 7.5-digit meter, but I have done what I could given the circumstances. Then I run the meter together with HP 34401A for about 28 hours taking measurements of 10V from Fluke 341A calibrator over GPIB and plotting the data using Octave 4 with instrument-control package. The results look good: just a few ppm of drift over a wide temperature range, and the meters stayed within about 2.5 ppm from each other.
Forum: http://www.eevblog.com/forum/metrology/datron-1071-repair/
Datron 1071 Service Manual: https://drive.google.com/file/d/0B3NWgPtazb_tMUhKbkZpYXlUQTg/
Fluke 341A calibrator repair: https://youtu.be/mxz3-fGs1Lk
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https://www.youtube.com/watch?v=jcCC867gKXE
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#138
138-keysight-33250a-function-generator
This unit did not have any output and intermittently showed a couple of different errors during self-test. The problem was traced to a batch of faulty 301 ohm resistors. 10 out of 48 failed. After replacing the faulty resistors the instrument seems to work fine.
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https://www.youtube.com/watch?v=o6E4Utmlnlg
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#149
149-presonus-nsb-16.8-repair
This unit had 4 broken input combo TRS-XLR connectors. A few samples were obtained from Amphenol and installed.
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https://www.youtube.com/watch?v=r1O4gXvh7uo
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1 month ago
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#28 -
28-tektronix-ps2520-lab-power-supply
This Tektronix PS2520 triple output power supply was sold on eBay in the "for parts and repair" category with a description of "no display". It turned out it needed a new a fuse, a DAC, and a calibration. The process of investigation and calibration is shown in this video.
Discussion: http://www.eevblog.com/forum/testgear/tektronix-ps2520-triple-output-power-supply-repair-and-calibration/
5TT fuses: http://belfuse.com/pdfs/5TT.pdf
AD7541A DAC data sheet: http://www.analog.com/media/en/technical-documentation/data-sheets/AD7541A.pdf
Tektronix PS2520 Series Technical Reference: http://exodus.poly.edu/~kurt/manuals/manuals/Tektronix/TEK%20PS2520%20Series%20Technical%20Reference.pdf
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https://www.youtube.com/watch?v=q3bn7r77yDY
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1 month ago
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video/mp4