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1 Jan 2020 18:06:15 UTC
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#29 - Coleman Rechargeable QuickPump battery upgrade
This Coleman Rechargeable QuickPump model 5999C400 had a dead 6V lead-acid battery. Simple replacing of the old-school battery seemed too boring, so an upgrade to Li-ion was attempted. There were some complications, and some compromises had to be made. I hope you will enjoy discussion of the design decisions and technical challenges involved.
RFP70N06 MOSFET data sheet: http://www.mouser.com/ds/2/149/RFP70N06-100073.pdf
Sony Li-ion Technical Handbook: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/Lithium%20Ion%20Battery%20MSDS.pdf
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https://www.youtube.com/watch?v=HqVPSuePv1c
RFP70N06 MOSFET data sheet: http://www.mouser.com/ds/2/149/RFP70N06-100073.pdf
Sony Li-ion Technical Handbook: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Prototyping/Lithium%20Ion%20Battery%20MSDS.pdf
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https://www.youtube.com/watch?v=HqVPSuePv1c
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#110
110-agilent-6611c-power-supply-repair
In the previous repair video I have found a few problems with this supply. One of them was seemingly fixed by cleaning the power board, but it was not so. The problem came back, and turned out to be a cracked ceramic capacitor.
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https://www.youtube.com/watch?v=dLMoqjmOBPs
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#113
113-shure-pgx2-handheld-microphone
This Shure PGX transmitter did not power up. The problem was traced to a faulty power switch.
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https://www.youtube.com/watch?v=-APbI_hSflA
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#74 -
74-anritsu-mg3670b-signal-generator
This signal generator had several problems. Two problems have been traced and fixed. So now the generator produces output with the right frequency and level. The architecture of various RF modules have been discussed In the process.
Small correction: I misspoke regarding the weight of the unit: the sticker reads "(greater symbol) 18 kg" (angle brackets aren't allowed in descriptions)
Forum: https://www.eevblog.com/forum/rf-microwave/anritsu-mg3670b-signal-generator-repair/
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https://www.youtube.com/watch?v=v8wE2MqeiXM
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#128
128-high-end-pioneer-elite-sc-09tx
This hi-end beast stopped turning on. It is very complex and weighs a ton. It was quite tricky to investigate the fault. Even a DSLogic USB logic analyzer by DreamSourceLab was used (perhaps was not necessary, but was fun anyway). It was found that the clock generator of the main MCU was not running. Also a reset was needed, which takes a secret combination of buttons on the front panel.
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https://www.youtube.com/watch?v=-80m7mpBbhY
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#125
125-fluke-19x-memory-programmer
A dedicated programmer for Fluke 19x memory modules was developed including software in C for an Atmel microcontroller and a piece of software in Python to control the programmer from a PC.
Previous videos:
Fluke 199C repair: https://youtu.be/6TryOv2d5qw
Followup: https://youtu.be/ug27Y1bNSw8
DIY memory module: https://youtu.be/C1NHDiM2-n0
Original module reassembling: https://youtu.be/FdeNznzRVGU
Forum: https://www.eevblog.com/forum/repair/fluke-199c-scopemeter-repair/
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https://www.youtube.com/watch?v=klQPO-uYMEA
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#2 -
2-tcxo-precision-frequency-reference
A look at 1ppm 10MHz TCXO frequency reference. Measurements are done using HP 5384A counter.
Specs: http://linearparts.com/images/7400B2A1-10MHZ-TCXO-3Y.JPG
Seller's eBay store: http://stores.ebay.com/BootsParts-Electronic-Components
Followup video with a teardown: http://youtu.be/kwDsffvTrLk
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https://www.youtube.com/watch?v=OGGz1Yt3HEM
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#116
116-casio-privia-px-860-digital-piano
This piano did not power up. The problem was narrowed down to its external power supply. The supply was cracked open, examined, discussed and repaired. It turned out that a primary winding of the transformer was broken off. Perhaps the supply was dropped.
As mentioned in the video, here is Zoom R16 mixing board with that died together with its power supply that was killed seemingly by a surge:
Zoom R16: https://youtu.be/3QJDH4LFgnQ
Power supply: https://youtu.be/wySRf2b0Low
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https://www.youtube.com/watch?v=QiiLz9g3wtQ
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1 month ago
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#102
102-adding-bms-to-li-ion-pack-for-roland
DR600 Li-ion battery pack was taken apart and a battery management system (BMS) was added to it. This was not very easy, but not too bad either having equipment, materials and experience with this sort of thing. If you are going to do something like this, please be very careful. Don't try this if you don't know what you are doing.
Li-ion pack for Roland V-Accordion investigation: https://youtu.be/1obxLWO8zo0
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https://www.youtube.com/watch?v=a600wjWiT0g
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1 month ago
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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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1 month ago
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