Published By
Created On
1 Jan 2020 18:06:15 UTC
Transaction ID
Cost
Safe for Work
Free
Yes
#57 - Agilent E3641A power supply repair
This power supply had non-functioning front panel (display, keypad and encoder). It turned out that three chips were dead in the front panel module: Intel 80C51 micro-controller, HV518PJ VFD driver and 74HC02 quad NOR gate. Fixing this took quite a bit of SMD and through-hole rework, and quite a bit of luck, especially finding the firmware for the micro-controller.
Forum: http://www.eevblog.com/forum/repair/agilent-e3641a-repair/
Replacement parts on DigiKey:
AT89S51: https://www.digikey.com/product-detail/en/AT89S51-24JU/AT89S51-24JU-ND/1118890
HV518PG https://www.digikey.com/product-detail/en/HV518PJ-G/HV518PJ-G-ND/4902550
Firmware 34401-88804 rev01: http://www.ko4bb.com/getsimple/index.php?id=download&file=HP_Agilent/Agilent_34401A_E3646A_Display_board_MCU_firmware_dump_EPROM_34401-88804_RE-34401-88804.zip
34401A multimeter service guide with display and keyboard schematic : http://literature.cdn.keysight.com/litweb/pdf/34401-90013.pdf
...
https://www.youtube.com/watch?v=E3F59nj6Fho
Forum: http://www.eevblog.com/forum/repair/agilent-e3641a-repair/
Replacement parts on DigiKey:
AT89S51: https://www.digikey.com/product-detail/en/AT89S51-24JU/AT89S51-24JU-ND/1118890
HV518PG https://www.digikey.com/product-detail/en/HV518PJ-G/HV518PJ-G-ND/4902550
Firmware 34401-88804 rev01: http://www.ko4bb.com/getsimple/index.php?id=download&file=HP_Agilent/Agilent_34401A_E3646A_Display_board_MCU_firmware_dump_EPROM_34401-88804_RE-34401-88804.zip
34401A multimeter service guide with display and keyboard schematic : http://literature.cdn.keysight.com/litweb/pdf/34401-90013.pdf
...
https://www.youtube.com/watch?v=E3F59nj6Fho
Author
Content Type
Unspecified
video/mp4
Language
Unspecified
More from the publisher
Controlling
VIDEO
#136
136-kawai-cn27-digital-piano-repair
The piano had non-working B4 key. The keyboard was taken apart and fixed. The problem was found to be with a rubber contact pad that got stuck in a strange twisted position somehow.
...
https://www.youtube.com/watch?v=_Tpe7UYVOqc
Transaction
Created
1 month ago
Content Type
Language
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
...
https://www.youtube.com/watch?v=KyfoScucfcQ
Transaction
Created
1 month ago
Content Type
Language
video/mp4
Controlling
VIDEO
#7 -
7-agilent-66309d-repair-and-calibration
Repair of a broken Agilent 66309D Mobile Communications DC Source purchased on eBay.
Service Manual: http://cp.literature.agilent.com/litweb/pdf/5964-8176.pdf
RCD resistor data sheet: http://www.rcd-comp.com/rcd/rcdpdf/PV-PVH-PWV-FA053.pdf
Vishay Dale resistor data sheet: http://www.vishay.com/docs/30204/rsns.pdf
Agilent 6612C repair video: http://youtu.be/HUSMUtIgP3E
...
https://www.youtube.com/watch?v=3kg7LIYbYLQ
Transaction
Created
1 month ago
Content Type
Language
video/mp4
Controlling
VIDEO
#14 -
14-casio-privia-px-110-digital-piano
Repair of a digital piano Casio Privia PX-110, which had two dead keys. The repair involved using conductive glue purchased from China on eBay for a ridiculously low price. The piano is back in business. Don't spill drinks into keyboards, folks!
...
https://www.youtube.com/watch?v=lREFbtqDr90
Transaction
Created
1 month ago
Content Type
Language
video/mp4
Controlling
VIDEO
#38 -
38-agilent-33120a-function-generator
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.
...
https://www.youtube.com/watch?v=FFtiUsgzk2E
Transaction
Created
1 month ago
Content Type
Language
video/mp4
Controlling
VIDEO
#115
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.
...
https://www.youtube.com/watch?v=FRuW3TsuDRI
Transaction
Created
1 month ago
Content Type
Language
video/mp4
English
Controlling
VIDEO
#69 -
69-mackie-srm450v2-speaker-repair
This active speaker did not power up. The problem turned out to be similar to the one we have seen before in the Mackie Thump TH-12A repair video: broken off pins from power diodes in TO-220 packages that are mounted on the back panel (heat sink).
Mackie Thump TH-12A repair: https://youtu.be/5zkEzjyKNjg
...
https://www.youtube.com/watch?v=PTy36zRlHOU
Transaction
Created
1 month ago
Content Type
Language
video/mp4
Controlling
VIDEO
#54 -
54-low-budget-metrology
Setting up a metrology lab on a small budget.
Datron 1071 repair: https://youtu.be/jcCC867gKXE
Fluke 341A repair: https://youtu.be/mxz3-fGs1Lk
EDC 520A repair: https://youtu.be/pkMySlkpTJk
Thermometer build: https://youtu.be/pj1HOM35vH4
KX Voltage reference : https://xdevs.com/article/kx-ref/
...
https://www.youtube.com/watch?v=80ypF-Ix2p8
Transaction
Created
1 month ago
Content Type
Language
video/mp4
Controlling
VIDEO
#101
101-roland-v-accordion-li-ion-battery
An existing design of a Li-ion battery pack for Roland V-Accordion was investigated. It does not use a battery management system (BMS), which is a bad idea. Charging process was measured, plotted and discussed. A proper design using BMS was discussed, built and tested.
Using Agilent 661x for testing Li-ion batteries: https://youtu.be/riB0NASj_KU
...
https://www.youtube.com/watch?v=1obxLWO8zo0
Transaction
Created
1 month ago
Content Type
Language
video/mp4
English