Archive for the ‘repair’ Category

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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Sony TC-252 reel to reel player restoration

Thursday, January 12th, 2017

Dilshan Jayakody has written an article about Sony TC-252 reel to reel player repair: As a first step of the restoration we remove the LA4440 module attached into that recorder and rewire the player with original wiring layouts. After rewiring we check all the transistors in that player and find-out...

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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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Repairing the HackRF

Thursday, March 3rd, 2016

Ramiro from 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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Posted in repair | 1 Comment »

10A Variac Soft Starter

Friday, January 8th, 2016

Steve Gardner did a repair of a 10A Carroll & Meynell Variac and documented the whole process on his blog: I recently purchased a used 10A Carroll & Meynell Variac from eBay for use in the lab, however the variac often caused the 32A B-curve MCB in the consumer unit to...

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Apple II ROM Dumper

Monday, December 21st, 2015

Quinn Dunki created an Apple II ROM tool project and posted a great write-up on digging into the ROM of her Apple IIc Plus: You may recall way back when I started my Apple II ROM Tool project, that I had intended to fix some bugs. That was the whole...

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Posted in hacks, repair | 2 Comments »

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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Posted in repair | 2 Comments »

Repairing the TUNE capacitor on the Heathkit HL2200 (SB-220) amplifier

Tuesday, November 10th, 2015

KA7OEI  did a repair on his amplifier.  He documented the whole process on his blog: Earlier this year I picked up a Heathkit HL2200 amplifier (the newer, "brown" version of the SB-220) at a local swap meet for a reasonable price.  What made it particularly attractive was that it not...

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Posted in repair | 1 Comment »

Radio thermostat CT-50 review and install

Friday, November 6th, 2015

Felix of LowPowerLab writes: I mentioned before that there’s added support for HTTP requests in the gateway interface. That allows using things like wi-fi thermostats, and this story is a review of how I did just that. I wanted to integrate the home thermostat into the Moteino IOT Framework Gateway...

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Recovering a bricked CC3D board using a Bus Blaster

Thursday, September 3rd, 2015

Angus describes on his blog how he used the Bus Blaster to recover a bricked CC3D board: A few months ago I went to upgrade my OpenPilot CC3D board an something went amiss and I ended up trashing the bootloader. I didn’t have a SWD dongle to reprogram it with so its...

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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 and analysis of an Anritsu MS2721A 7.1GHz portable spectrum analyzer

Monday, May 11th, 2015

Teardown, repair and analysis of an Anritsu MS2721A 7.1GHz portable spectrum analyzer by Shahriar of TheSignalPath: In this episode Shahriar takes a look at an Anritsu MS2721A portable spectrum analyzer which does not completely boot up. After displaying the message “Application Running!” the unit no longer advances to the main...

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Dead Macbook Pro logic board diagnosis

Friday, April 24th, 2015

Louis Rossmann writes: Here I diagnose a board that has issues on PP3V42_G3H which caused issues with the MCP, whose clock circuit is powered by PP3V42_G3H! I go through my diagnostic process and mindset, and follow from beginning to end as I resolve the problem. Via Hacked Gadgets.

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Fixing a Mega drive cartridge with old BIOS chips

Wednesday, February 18th, 2015

Robson of Dragão sem Chama writes, "this time I want to share my Mega Drive flash cart made of old BIOS chips. I made it because my Sonic cart was not working since always. I used Arduino, Python and a bit of Processing (nice to show visual info) to program" Via the...

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Posted in repair | 1 Comment »

On Western Digital hard drives, PUIS and Rocket Raid controllers

Friday, January 16th, 2015

Peter Hofmann fixed his drives and documented the whole process on his blog: After about a day of trial and error, I finally fixed my drives. To save anyone else the days worth of effort, I've documented my solution here: Firstly you need to go and find a tool called HDAT2 from

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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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Posted in repair | 3 Comments »

Keithley 197 battery option build

Monday, November 3rd, 2014

Kerry Wong blogged about his Keithley 197 battery option build: I have been quite happy with my fixed-up Keithley 197 5 ½ digit bench meter purchased from eBay (you can find the teardown pictures here) earlier this year. Keithley 197 has a battery pack option (Model 1978), and this option allows...

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Trio JR-310 and TX-310 restoration project

Friday, September 5th, 2014

Dilshan Jayakody did restoration of TX-310 transmitter and JR-310 receiver step-by-step: I got Trio (now Kenwood) JR-310 and TX-310 SSB receiver and transmitter pair recently. When it comes to me both receiver and transmitter are in very bad shape and most of the PCBs and chassis are covered with dust and some...

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Eddystone EC10 communication receiver restoration and PSU add-in

Monday, August 18th, 2014

Dilshan Jayakody writes: Recently I got vintage Eddystone EC10 MK1 communication receiver from friend of mine and it is completely dead when it comes to me. EC10 MK1 is one of Eddystone's very early solid state communications receivers and it use 10 PNP Germanium transistors. This receiver cover 550 kHz...

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Posted in power supply, repair | 1 Comment »

Wavetek 907 repair, YIG oscillator teardown

Monday, August 4th, 2014

Kerry Wong writes: As I mentioned in my previous posting, there was an issue with my Wavetek 907 microwave frequency generator. While everything was fine during my initial testing, the frequency display is now stuck with an out-of-range display and the adjustable frequency range is limited to between around 6.9...

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Posted in repair, Teardowns | 1 Comment »

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Recent Comments

  • Noy: Yuuup
  • KH: I guess this is a failed attempt at making a pass/fail cable tester out of discrete ICs. A single pass/fail LED is not that useful....
  • Max: Considering it only seems to test that all wires conduct, I'm not sure what exactly does this show you that 7 LEDs each powered through...
  • David: Please
  • Dan: Such comment. Wow.