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1 Jan 2020 18:06:15 UTC
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#49 - Shure SC wireless microphone system repair
An old Shure SC series VHF wireless system (SC1 transmitter + SC4 receiver) was faulty. The problem was traced to the local oscillator board in the receiver, which did not produce any output. Applying pressure to this board could make the unit start or stop working. Re-flowing the soldering joints on this board seemed to fix the problem.
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https://www.youtube.com/watch?v=GqRclPsp7RQ
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https://www.youtube.com/watch?v=GqRclPsp7RQ
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#98 -
98-roland-v-accordion-fr-7x-repair
The instrument did not have sound through the speakers. The problem was diagnosed to be in the power supply of the amplifier. A step-down converter chip by Linear Technology has failed. The chip was replaced, and the accordion is back in business.
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https://www.youtube.com/watch?v=nHH8tJpLciM
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1 month ago
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#142
142-shure-psm300-transmitter-repair
This Shure PSM300 P3T transmitter did not show any audio level on the display, and the receiver did not show the blue light (but showed the RF level). The fault was traced to a tiny (0402) 1 ohm resistor on the output from the 9V regulator, so that the audio section did not get power.
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https://www.youtube.com/watch?v=cON3NIxKR8o
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1 month ago
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video/mp4
English
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#95 -
95-fluke-19x-li-ion-battery-mod
DIY Li-ion battery pack for Fluke 19x scopemeters. About twice the capacity of the original Ni-MH pack. Requires a small modification in the scopemeter: adding a 120K 1% resistor across R4113.
Repair video: https://youtu.be/6TryOv2d5qw
Followup: https://youtu.be/ug27Y1bNSw8
Battery testing: https://youtu.be/riB0NASj_KU
Forum: https://www.eevblog.com/forum/repair/fluke-199c-scopemeter-repair/
Connector housing on Digikey: https://www.digikey.com/product-detail/en/molex/0050375043/WM17405-ND/259392
Crimp contacts on Digikey: https://www.digikey.com/product-detail/en/molex/0008701040/WM17406-ND/259393
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https://www.youtube.com/watch?v=Lnkz2z6KjG8
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Created
1 month ago
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video/mp4
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#48 -
48-datron-1071-display-replacement-part
The meter I repaired in my previous video still has a bad gas discharge display. In this video a project to build a replacement was started. Three different approaches were discussed and prototypes built using Atmel Mega 328p micro-controller. The software was written in C and assembly languages in Arduino environment.
Forum: http://www.eevblog.com/forum/metrology/datron-1071-repair/
Repair video: https://youtu.be/jcCC867gKXE
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https://www.youtube.com/watch?v=H9_Jwy-2vXU
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1 month ago
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video/mp4
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#61 -
61-zoom-power-supply-teardown-and-repair
Teardown, analysis and repair of the Zoom power supply that was found to be dead in the previous video. It seems that the supply did not survive some sort of a surge on the input, and there was no protection against that. The supply was repaired and some details of the design were discussed.
Previous video: https://youtu.be/3QJDH4LFgnQ
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https://www.youtube.com/watch?v=wySRf2b0Low
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1 month ago
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video/mp4
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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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1 month ago
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video/mp4
English
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#85 -
85-blown-pc-power-supply-nzxt-pp-800
This is a quick look at a computer power supply with catastrophic failure on the primary side. It seems to be beyond repair.
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https://www.youtube.com/watch?v=Mvz6AAK5OG4
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1 month ago
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video/mp4
Controlling
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#15 -
15-hewlett-packard-33120a-function
Another good deal from eBay. It is an HP 33120A 15MHz function and arbitrary waveform generator. The instrument was sold for parts or repair and described as "untested". It turned out to be a simple fix. I hope it is still of interest to someone.
Fuse datasheet: http://www.littelfuse.com/~/media/Electronics/Datasheets/Fuses/Littelfuse_Fuse_251_253_Datasheet.pdf.pdf
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https://www.youtube.com/watch?v=6Ww3seKMtsY
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1 month ago
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video/mp4
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#10 -
10-canon-battery-testing-part-4
The capacity of a no-name BP-827 battery for Canon Vixia HF10 is measured. Array 3710 electronic load is used (a re-branded unit).
Previous videos:
Part 1: http://youtu.be/hUCnEbOAP3A
Part 2: http://youtu.be/yXYKc9gMNO4
Part 3: http://youtu.be/hp7SDeApVUw
Code on GitHub: https://github.com/sandy-s/electronic_load
eBay store the battery was bought from: http://stores.ebay.com/laptop-power
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https://www.youtube.com/watch?v=DRkjyakpKMs
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Created
1 month ago
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video/mp4