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1 Jan 2020 18:06:15 UTC
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#38 - Agilent 33120A function generator repair
Another lucky find from eBay. The unit was listed for parts or repair with the description that it quickly flashes an error message. Upon powering up there was a burning smell. The culprit was found to be a tantalum capacitor, which was promptly replaced.
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https://www.youtube.com/watch?v=FFtiUsgzk2E
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https://www.youtube.com/watch?v=FFtiUsgzk2E
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#81 -
81-samson-d-1500-repair-fail
The unit was taken apart and examined. 3.3V power rail was found to be low, and tree chips running hot: LD33 voltage regulator, 74HC245 buffer and Xilinx XC9536XL programmable logic chip. The Xilinx CPLD chip was found to be loading the 3.3V rail. The chip is programmable, and, most probably, the program is not available and not readable from such chip (even if a working unit was available). Therefore the unit was deemed beyond economical repair.
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https://www.youtube.com/watch?v=ja6QE_O-sG8
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1 month ago
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#5 -
5-agilent-6612c-repair-and-testing
Repairing of Agilent 6612C power supply, which was bought on eBay. It was sold "for parts or repair", and was cheap enough so that I couldn't resist.
Agilent 6612C key features:
Output ratings
Voltage: 0 to 20 V
Current: 0 to 2 A
Programming accuracy at 25°C ±5°C
Voltage: 10 m V
Current 0.05% + 1 mA
Ripple and noise (20 Hz to 20 MHz)
Voltage rms: 0.5 mV
Voltage Peak-to-Peak: 3 mV
Normal mode rms: 1 mA
Service manual: http://cp.literature.agilent.com/litweb/pdf/5962-8200.pdf
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https://www.youtube.com/watch?v=HUSMUtIgP3E
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1 month ago
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#137
137-agilent-e3642a-power-supply-repair
The unit powered up but had nothing on the display. It turned out that the VFD was shattered. A replacement was fitted. Basic load testing was performed.
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https://www.youtube.com/watch?v=Sj8PMUaCsKg
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1 month ago
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English
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#21 -
21-alesis-sr-16-drum-machine-repair
Repair of a classic Alesis SR-16 drum machine, which was producing distorted sounds. Scratchy volume pot was also cleaned, and a dead 3V lithium battery was replaced with a standard 2032 one in a battery holder.
PCM54 DAC datasheet: http://www.ti.com/lit/ds/symlink/pcm54.pdf
Second generation of SR-16: look inside, comparison with the first generation, repair and testing: https://youtu.be/6RJVtQ8i0eY
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https://www.youtube.com/watch?v=vleEClZmCso
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1 month ago
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video/mp4
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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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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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#150
150-behringer-ultramatch-pro-src2496
This unit appeared to be stuck upon powering up. The problem was traced to a couple of failed electrolytic capacitors.
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https://www.youtube.com/watch?v=WwA86J9p0uk
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1 month ago
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#77 -
77-korg-electribe-er-1-mkii-repair-fail
This Korg ER-1 had a burned 5V DC-DC converter, which, most probably, killed some other important parts such as the micro-controller, DSP and memory. The DC-DC converter was repaired, but there were no signs of life, and the DSP seems to run too hot. At the moment this looks beyond economical repair.
Service manual: http://www.warningwillrobinson.com.au/manuals/Korg%20EM1%20service%20manual.pdf
Forum: https://www.eevblog.com/forum/repair/korg-electribe-er-1-repair/
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https://www.youtube.com/watch?v=h0OfLD_NHDU
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1 month ago
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#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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Created
1 month ago
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video/mp4
English