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1 Jan 2020 18:06:15 UTC
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#42 - EIP 575 microwave counter
Another great piece of test gear from eBay. It was sold for parts or repair, but turned out to be functional except a minor problem with display, which was fixed. The unit is equipped with high stability time base (option 04). It agrees with my Agilent E4400B generator with high stability reference (option 1E5) within 40 ppb. It seems to be a very solidly built instrument.
Forum: http://www.eevblog.com/forum/testgear/eip-575-microwave-counter/
Manual: http://www.ham-radio.com/wa6vhs/Test%20equipment/EIP/578.pdf
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https://www.youtube.com/watch?v=03u4jA9E_Yo
Forum: http://www.eevblog.com/forum/testgear/eip-575-microwave-counter/
Manual: http://www.ham-radio.com/wa6vhs/Test%20equipment/EIP/578.pdf
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https://www.youtube.com/watch?v=03u4jA9E_Yo
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#44 -
44-hp-8590a-spectrum-analyzer-repair
In the previous video I replaced a par of blown diodes in the RF mixer of HP 8590A with Avago (Broadcom) HSMS-2802. In this video I experimented with HSMS-2812, HSMS-2822 and even with unmatched pair of 1N5711.
Previous video: https://youtu.be/kV4BOf3Oqk8
Forum: http://www.eevblog.com/forum/repair/hp-8590a-spectrum-analyzer-repair/
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https://www.youtube.com/watch?v=fTom0Z0Xspw
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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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Controlling
VIDEO
#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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Controlling
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#151
151-shure-slx-receiver-repair
This receiver powered up fine, but did not receive anything from a good transmitter. The problem was traced to a faulty 32.768 KHz crystall responsible for tone key detection.
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https://www.youtube.com/watch?v=kbfsa7Hs9Vs
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Controlling
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#111
111-fluke-343a-recapping
All electrolytic caps except the big and expensive high-voltage ones were replaced with high-quality Vishay and Kemet caps. Chopper was adjusted as well as zero points of all tree ranges.
Repair video : https://youtu.be/ctypYMlTWyc
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https://www.youtube.com/watch?v=cNlvXd2y0LE
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#129
129-recapping-pioneer-elite-sc-09tx
This high-end receiver was repaired in the previous video. A lot of large electrolytic capacitors in the Bang & Olufsen 10-channel ICEpower class D power amplifier were found bulging. This episode is about replacing them: finding the right parts on DigiKey and Mouser, measuring the difference, fitting the new ones.
Repair video: https://youtu.be/-80m7mpBbhY
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https://www.youtube.com/watch?v=lX2RTHgXync
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#12 -
12-array-3644a-power-supply-repair
A quick look at a few problems I found with this power supply. Are some of them just defects of my particular unit? The encoder problem is clearly shared with my electronic load of similar design. Leave a message if you have the same issues or if you checked and found no issues. Thanks.
Repair video: http://youtu.be/Ip0P3p3vHTY
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https://www.youtube.com/watch?v=AbU8kJIhMGU
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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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#57 -
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
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https://www.youtube.com/watch?v=E3F59nj6Fho
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