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1 Jan 2020 18:06:15 UTC
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#39 - Agilent 66321B troubleshooting and calibration
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
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
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#109
109-agilent-6611c-power-supply-repair
This power supply did not regulate properly, showed extra commas on the display and started to smell after enabling the output for a while. A burnt tantalum capacitor was found on the front panel board and also some mysterious shorts on two boards: unidentified one on the power board, and one sort between two pins under a display driver chip.
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https://www.youtube.com/watch?v=385Vt0iOwXA
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1 month ago
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video/mp4
English
Controlling
VIDEO
#80 -
80-servicing-hp-8563e-spectrum-analyzer
This analyzer needed some servicing. The key pad had to be cleaned. And there was a hope that display focus could be improved, which did not quite happen, but it was not too bad. In the process some capacitors in the power supply were found to be bad, so all of them have been replaced.
EEVblog RIFA capacitors video: https://youtu.be/XAbrU17hLTM
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https://www.youtube.com/watch?v=v9KSWkZIqzk
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1 month ago
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Controlling
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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
Controlling
VIDEO
#133
133-studiologic-sl-990-pro-repair-fail
This is a good old MIDI controller that stopped working. There seems to be a faulty PIC16F74 microcontroller in this poor thing. Replacing the chip won't help without the firmware, so this thing is hopeless unless there is a donor unit available.
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https://www.youtube.com/watch?v=PHr5pgrtZdw
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1 month ago
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video/mp4
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Controlling
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#86 -
86-nad-3225pe-stereo-amplifier-repaired
Someone tossed this amplifier out with loose covers and missing screws. Apparently, this is an unfinished repair attempt. The amplifier was repaired and tested, and many details have been explained in the process.
This channel is also available at https://lbry.tv/@FeedbackLoop
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https://www.youtube.com/watch?v=1I7wv7wJ7zs
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1 month ago
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video/mp4
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#124
124-agilent-e4418b-power-meter-repair
This RF power meter was picked up on eBay as non-working, and indeed it did not start up. The problem seemed to be with the keypad on the front panel. Unfortunately, the exact cause was not found. The keypad just started working after disassembly, which doesn't give much confidence that the problem won't come back one day. Also the lithium battery was found to be completely dead, and was replaced by an equivalent FDK one from DigiKey.
FDK 3V lithium battery: https://www.digikey.com/short/pz429fjt
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https://www.youtube.com/watch?v=KV6pEl5kAUw
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1 month ago
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video/mp4
English
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
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1 month ago
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video/mp4
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VIDEO
#126
126-yamaha-dxr15-powered-speaker-repair
This speaker worked, but produced a loud hum. The fault was traced to a dead electrolytic capacitor in the power supply.
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https://www.youtube.com/watch?v=8odSLDK2Xrk
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1 month ago
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video/mp4
English
Controlling
VIDEO
#22 -
22-hitech-9v-li-ion-battery-teardown
A faulty HiTech RLI-9600 9V 600mAh lithium-ion battery was taken apart. The fault was identified and fixed. A full charge and discharge test was done. Desoldering and soldering of a tiny 8-TSSOP package was demonstrated.
RLI-9600 battery specs: http://www.batterymart.com/pdfs/rli9600.pdf
NT1721 datasheet: http://www.covac.com.tw/files/DRIVER/201409010049201.pdf
DMG8822 datasheet: http://www.diodes.com/datasheets/ds31798.pdf
Previous battery testing videos:
http://youtu.be/DRkjyakpKMs
http://youtu.be/hp7SDeApVUw
http://youtu.be/yXYKc9gMNO4
http://youtu.be/hUCnEbOAP3A
Equipment used:
Hewlett Packard 6613C power suplly
Array 3710 electronic load (rebranded unit)
Atten 858D hot air station (branded WEP)
Weller WESD51 soldering station
Fluke 87 V multimeter
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https://www.youtube.com/watch?v=Zj4OsfrJgUg
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Created
1 month ago
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video/mp4