# repair

1. ### HP 180C Oscilloscope repair attempt - no traces and hissing noise.

Hi all, I noticed a wealth of knowledge and advice on these forums regarding oscilloscope repair, so I had to sign up! I while back I purchased a HP 180C. I have had it in storage a while and have finally pulled it out as a project to work on. Unfortunately it seems that I have no beam at...
2. ### Stabilising supply of noisy DSO-2250 oscilloscope

I've had a DSO-2250 9-bit/250MSps/60MHz scope for a decade, bought "new", and it's always had a large ripple voltage (about 1/3 of a division) overlayed on any signal. The ripple sometimes made the DSO barely usable. At some stage I put a filter on the USB cable inline with the power; this...
3. ### Need help repairing a B+K 1650 Tri-Output Power Supply

Hi all, I recently came into possession of an old B+K 1650 Tri-Output Power Supply that has seen better days, and I would love some help with getting it back to normal again. There are pictures and a video, as well as links to the schematic, user's manual, and parts list in this Imgur album. I...
4. ### Repair Lecroy Waverunner 104MXi

Hi, I am trying to repair a Lecroy Waverunner 104MXi. The problem is when you plug it in and switch it ON, windows starts booting but then it just turns off. Now if I try to switch the oscilloscope ON again then it does not work until and unplug it and plug it back in again. I wanted to look at...

Hello, I am new here and I need help with an old portable radio antenna. It seems to have gotten the solid tip stuck or fallen into the entire thing. If there is a way to get this solid tip out could you please tell me?
6. ### Fixing a pair of headphones

First things first, they look like Beats, but I’m pretty sure these are knockoffs. Nonetheless, they sound pretty good, and I picked them up at Goodwill for a steal and love a challenge, so if someone is interested on taking on this electronics mystery with me I’d be incredibly grateful...

Okay so I am completely new to electronics, but I am a professional Home Contractor with lots of experience fixing things in general. Recently I decided to try to fix up a stereo for my shop, and so I went and salvaged an AIWA CX-NA777 Stereo system that worked decently except for the CD...

Hi there, I have a Victron Centaur battery charger, 12v 200 amp output. It's a monster! On inspection it's actually two identical 100a chargers in the same case, connected in parallel. Other than a tiny 3 wire cable whose purpose I'm not sure of, there is nothing connecting the two chargers...
9. ### USB Port (Type B) Broken... Can this be fixed?

I have a Zoom G5 pedalboard for guitar effects, but the plastic port came loose and disconnected from the 2 metal prongs. 1 of the prongs is broken, I have attempted to solder it back on with no luck due to my lack of experience in this field. If I take it to a shop to repair, would it be...
10. ### Repair help regards wall ac adapter

Hello Friends, I am trying to repair a Panasonic Wall ac adapter (6V, 500ma) smps based, I checked with multimeter no output, checked and internal fuse with continuity and all okay, I am attaching pics, im novice so donno what else may be wrong in it, front and back image of pcb with components...
11. ### Making a replacement cable for a HP 8445B spectrum analyzer preselector

Hello All, Lately, I have been working on building a replacement for a somewhat rare cable assembly for communicating between a HP 141T/8555A/8552 mainframe spectrum analyzer and a HP 8445B "Automatic Preselector" add-on box, and I thought I would document my work here for others to follow. A...
12. ### Need Help Repairing Old PCB

I collect old vhs, and recently got some cool gimmick ones that light up when you press a button. However, they are almost 30 years old and no longer work. Taking a look at the pcb both were heavily corroded. I scraped off as much green corrosion as I could and replaced batteries but no luck...
13. ### One Logitech X230 stereo speaker not working

I recently acquired a Logitech X230 speaker set, with subwoofer and stereo speakers from a friend, but was dismayed to learn that the left speaker is non-operational. The other one and the subwoofer work fine. Im a complete noob to sound/speakers, so I decided to open it up and look for broken...
14. ### Help repairing an Headset with dual jack connector

Hi guys! This is my first post here because I'm in trouble finding a right solution to repair my headset. So this is my headset: And I broke to two jacks and lost them. The cable is cut before the plastic splitter and I´ve got an image with the cables. There are 1 green, 1 red, one copper...

17. ### I don't have a Soldering iron?

I'm repairing an HTC Desire 816 that had a broken screen and LCD. I fixed all of that but the battery terminal was some how pulled away from the circuit board. I need to solder the terminal back onto the circuit board in order to charge the phone. However, I don't have a soldering iron. Is there...
18. ### Repairing Blown Circuit - Overpowered with 10v 2.4amp instead of 5v 2amp

Hello, I know near nothing about circuits and am happy to learn what I need, to get this repaired. Where do I start? I have a bluetooth music receiver with digital out (toslink coax) purchased from overseas. I connected an incorrect power supply and it no longer works (I first connected the...