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13 May 2021 00:21:08 UTC
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#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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https://www.youtube.com/watch?v=FRuW3TsuDRI
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Content Type
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video/mp4
Language
English
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#100
100-roland-v-accordion-fbc-7-power
This is a power supply, battery charger and footswitch for Roland V-Accordion FR-7 (and FR-7x). It did not power up, and had some sings of a previous repair attempt. The problem was traced to a dual rectifier diode on the secondary side of the power supply. After replacing the faulty component with a suitable equivalent the power supply seems to work properly.
Dual schottky diode MBR20100CT: https://www.digikey.com/product-detail/en/smc-diode-solutions/MBR20100CT/1655-1036-ND/6022126
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https://www.youtube.com/watch?v=Xd7J8UzSjkI
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
#73 -
73-mackie-thump-th-12a-bad-woofer
This Mackie Thump speaker has a damaged woofer with a shorted voice coil. The symptom was demonstrated, and the diagnosis was confirmed by measuring the voice coil both at DC and at 1KHz. A good woofer was also measured (not the same model) to show the difference.
Previous Mackie Thump TH-12A repair: https://youtu.be/5zkEzjyKNjg
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https://www.youtube.com/watch?v=KyfoScucfcQ
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
#43 -
43-hp-8590a-spectrum-analyzer-repair
A good old HP 8590A spectrum analyzer, which was picked up from eBay for parts or repair. It turned out to have a bad mixer in the first converter. A matched pair of schottky diodes was dead. A replacement was found and installed. The analyzer seems to be back in business. Perhaps, it will need some adjustments though.
Forum:
http://www.eevblog.com/forum/repair/hp-8590a-spectrum-analyzer-repair/
Service manual:
http://www.keysight.com/upload/cmc_upload/All/8590AServiceGuide.pdf
Avago (Broadcom)HSMS-28xx datasheet:
http://www.mouser.com/ds/2/678/AV02-0533EN[1]-908864.pdf
Diodes on Mouser:
HSMS-2802 - the ones I used:
http://www.mouser.com/ProductDetail/Broadcom-Avago/HSMS-2802-BLKG
HSMS-2812 - the ones I think I should have used:
http://www.mouser.com/ProductDetail/Broadcom-Avago/HSMS-2812-BLKG
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https://www.youtube.com/watch?v=kV4BOf3Oqk8
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
#18 -
18-alesis-q49-keyboard-repair
Repair of Alesis Q49 MIDI keyboard controller. It turned out to have broken solder joints on the USB connector. The joints were reinforced with small pieces of a thin wire, but, perhaps, just touching them up might be enough. Well, some repairs happen to be trivial, so that experienced folks might not be quite interested watching this video. I hope someone still can find this useful.
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https://www.youtube.com/watch?v=EIYqv3KK8pA
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
#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
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
#25 -
25-do-it-yourself-openevse-level-2
In this episode the project was completed. A few extra features were added such as LCD display and current measurement. Everything was fitted into an enclosure. The temperature inside the enclosure was measured after about 30 minutes of charging Nissan Leaf at 16A.
Part 1: https://youtu.be/JVhBMvj4KuA
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https://www.youtube.com/watch?v=to4eYCJ4ZfM
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
#39 -
39-agilent-66321b-troubleshooting-and
Troubleshooting of a faulty Agilent 66321B Mobile Communications DC Source from eBay. It seems like the calibration memory was corrupted somehow. After going through the calibration procedure the unit appears to work just fine.
User's guide: http://cp.literature.agilent.com/litweb/pdf/5964-8184.pdf
Repair of Agilent 66309D: https://youtu.be/3kg7LIYbYLQ
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https://www.youtube.com/watch?v=OqyC8DkskaI
Transaction
Created
1 year ago
Content Type
Language
video/mp4
Controlling
VIDEO
#117
117-krk-rockit-5-powered-studio-monitor
These speakers suffered from the same problems as similar Rokit 6 speakers in video #105: conductive and corrosive glue and failing electrolytic capacitors. The glue was removed, all electrolytic caps were replaced. The speakers are back to life.
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https://www.youtube.com/watch?v=uL2RAHWpZug
Transaction
Created
1 year ago
Content Type
Language
video/mp4
English
Controlling
VIDEO
#3 -
3-canon-battery-testing-part-2
I bought another battery to try: TechFuel NB-2L 850mAh.
Same equipment: Array 3710A electronic load (a re-branded unit), some programming in Python using Eclipse to log data from the electronic load, and a tiny bit of power of GNU Octave for plotting data.
Previous tests: http://youtu.be/hUCnEbOAP3A
After I finished the video it occurred to me to try a gentle discharge at 150mA. It took 207min, which translates to 518mAh. It is essentially the same as measured at 400mA.
Update (Apr 22 2014): the seller invited me to send the battery back to them for a refund, and I must pay the shipping. I don't like this, but I will send it back. I don't need one more useless battery sitting around.
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https://www.youtube.com/watch?v=yXYKc9gMNO4
Transaction
Created
1 year ago
Content Type
Language
video/mp4