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Posts Tagged ‘repair’

HP 8620C sweep generator repaired

Thursday, March 15th, 2018

Kerry Wong did a repair of an HP 8620C sweep generator we covered previously: In my previous post, I did a teardown of an HP 8620C sweep generator along with an HP 86245A 5.9 GHz to 12.4 GHz RF plugin. A few of the plguin boards in the 8620C had...

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Capacitor plague? Inside an HP 8620C sweep oscillator and HP 86245A RF plugin

Wednesday, February 21st, 2018

A teardown of the HP 8620C and HP 86245A by Kerry Wong: I just picked up an HP 8620C sweep oscillator with an HP 86245A 5.9 GHz to 12.4 GHz RF plugin on eBay. This time around though, the unit does not work. While it was advertised as a working...

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Repairing the card reader for a 1960s mainframe: cams, relays and a clutch

Tuesday, February 13th, 2018

Ken Shirriff writes: I recently helped repair the card reader for the Computer History Museum's vintage IBM 1401 mainframe. In the process, I learned a lot about the archaic but interesting electromechanical systems used in the card reader. Most of the card reader is mechanical, with belts, gears, and clutches...

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Repairing a 1960s mainframe: Fixing the IBM 1401’s core memory and power supply

Thursday, December 28th, 2017

Ken Shirriff wrote a great article describing the repair process of  the vintage IBM 1401 mainframe computer: The problem started when the machine was powered up at the same time someone shut down the main power, apparently causing some sort of destructive power transient. The computer's core memory completely stopped...

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Teardown and repair of an Agilent E3632A DC power supply

Friday, September 22nd, 2017

Teardown and repair of an Agilent E3632A DC power supply from The Signal Path: In this episode Shahriar & Rosanah investigate an Agilent power supply which does not appear to power on. It can be quickly observed that the fuse has failed on the unit. Using an isolation transformer a...

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Teardown and repair of an Agilent 53152A 46GHz microwave frequency counter

Wednesday, August 9th, 2017

Agilent 53152A 46GHz frequency counter teardown and repair from The Signal Path: In this episode Shahriar investigates a faulty Agilent 53152A 46GHz frequency counter. The instrument does not power on and shows no sign of internal voltage presence. Teardown of the instrument reveals a large PCB where all analog and digital circuity...

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How Scotty made his own iPhone in China

Thursday, April 13th, 2017

https://www.youtube.com/watch?v=leFuF-zoVzA Over the past two months we've been super excited to follow Scotty's adventure recycling/refurbishing an iPhone 6S in the used cell phone market just south of Huaqiangbei, Shenzhen, China. Scotty finds all the bits and pieces from various sellers and then follows the iFixit instructions, backwards, to build his...

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Teardown, repair and experiments with a Tektronix RSA 6114A real-time spectrum analyzer

Friday, January 27th, 2017

Tektronix RSA real-time spectrum analyzer teardown from The Signal Path: In this episode Shahriar attempts a difficult repair of a Tektronix RSA real-time spectrum analyzer. This well-equipped instrument reports several error messages during startup POST including LO Unlock as well as Signal Path failures. The service manual of the instrument...

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AVO DA116 repair: Replacing the LCD

Friday, May 27th, 2016

  Daniel Bailey from Bit Of A Hack did a repair of a digital Avometer DA116 and documented the whole process on his blog: Anyway, this post is about my AVO DA116. I did this repair a while ago and almost forgot to post about it. I bought a broken...

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Teardown, repair and experiments with the Anritsu 37347A 20GHz Vector Network Analyzer

Friday, May 13th, 2016

[embed]http://www.youtube.com/watch?v=dwAieDTRMdQ[/embed] Here's another great video teardown from TheSignalPath: In this episode Shahriar repairs an Anritsu 37347A 20GHz Two-Port Network Analyzer. The unit does not boot up and as a result its internal state is unknown. The boot fault is traced to a bad RTC module which has a built-in integrated...

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Repairing the HackRF

Thursday, March 3rd, 2016

Ramiro from t4f.org did a repair of a HackRF One and documented the whole process on his blog: I broke my HackRF One. I have no idea how, but I did it. While testing a power amplifier I realized that there was not transmission at all. After checking the software, the...

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Teardown, repair & calibration of a Valhalla 2701C Programmable Precision DC voltage standard

Thursday, January 21st, 2016

A teardown and repair of a Valhalla 2701C Programmable Precision DC voltage standard from The Signal Path: In this episode Shahriar examines a faulty Valhalla 2701C Programmable Precision DC Reference instrument. Valhalla Scientific’s 2701C Programmable Precision DC Voltage Calibrator delivers ultra-precision, ultra-stable DC voltage from 100 nanovolts to 1200 volts. This unit...

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Repairing a Marconi Instruments 2955A Radio Communications Test Set, part 1

Tuesday, November 17th, 2015

Mikko has written an article about Marconi 2955A repair: First off, I decided to see what was the deal with the CRT. I have never worked on CRTs before, I have understanding of how the picture is formed by steering the electron beam using the deflection coils but that’s about it....

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Teardown, repair & analysis of a Rohde & Schwarz FSH3 3.0GHz portable spectrum analyzer

Thursday, August 6th, 2015

A teardown and repair of a Rohde & Schwarz FSH3 3.0GHz portable spectrum analyzer from The Signal Path: In this episode Shahriar examines a faulty R&S FSH3 100kHz – 3.0GHz Portable Spectrum Analyzer. This exceptionally dirty unit does not power on and is missing a power supply and battery. After...

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Teardown & repair of the Siglent SHS810 100MHz 1GS/s portable oscilloscope & multimeter

Wednesday, July 8th, 2015

Here's a teardown & repair of the Siglent SHS810 100MHz 1GS/s portable oscilloscope & multimeter from The Signal Path: In this episode Shahriar examines the failure of a Siglent SHS810 100MHz 1GS/s portable oscilloscope and multimeter. The instrument’s multimeter inputs are functional, however the neither of the oscilloscope inputs display...

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Teardown and repair of an Agilent E4433B ESG-D synthesized signal generator

Friday, December 26th, 2014

Teardown and repair of an Agilent E4433B ESG-D synthesized signal generator: In this episode Shahriar repairs an Agilent E4433B ESG-D Synthesized Signal Generator. This 4GHz unit shows the "UNLEVEL" error for all frequencies and at all output power levels. After a close look at the system block diagram the fault...

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Reviving 80’s arcade, Super invaders

Friday, December 5th, 2014

Stian did restoration of 80's arcade. He wrote a post on his blog detailing the process: I did a visual inspection the board looking for shorts or burned out components, and replaced a few 100nF ceramic capacitors that literally had cracked and/or fallen off. I then examined the on-board power supply. It...

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HP 3468A bench multimeter repair

Thursday, January 30th, 2014

HP 3468A bench multimeter repair: There are a number of great older bench meters out there that would be perfect when upgrading from a hand held meter when working on the bench. The HP 3468A meter can be had for under $200 in good working condition and often around $100...

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Hot-air rework station repairing

Friday, April 12th, 2013

Oakkar7  shares his experience repairing his hot-air station: I quickly checked the problem. There is no air flow at the nozzle. But I still heard the air compressor  sound. Today, I tear down and find out the problem. My rework station is a cheap china made, LK852D brand. Here is...

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Posted in DIY, tools | 1 Comment »

Weller DS701E soldering-desoldering station repair

Wednesday, January 30th, 2013

Gelbanana had some free time on his hands and he decided to try and repair an old Weller DS701E soldering-desoldering station he had laying around. The problem was diagnosed to a couple of bad capacitors. After a quick replacement, the station started working as expected, with the exception of the...

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