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Repair Mistakes & Blunders - what bonehead move have YOU pulled??

I did the same thing relamping a stereo receiver about 25 years ago. It was a lasting memory. Restringing dial cords is not something for which I have any skill. 3 hours later it had a new dial cord. I am still extremely cautious whenever I need to solder near a dial string.
I’ve learned my lesson - when I solder near a dial string I put a bit of tin foil over it for protection.
 
Relamping my Luxman R-1120 I nicked and broke the tuner string with the hot iron.....twice!

The best (worst?) was changing the driveshaft u-joints on my pickup truck outside on my fairly steep driveway. Just as I hammered out the last bolt I realized I forgot to chock the wheels....Oops, panic moment! I quickly jammed my boot under the tire as a wedge and hollered until the teenage neighbor came to the rescue. It was parked facing uphill so I narrowly escaped getting rolled over by the front undercarriage. Gives me shivers to this day.

My uncle's brother did this, except he became the chock. It crushed his ribs. He's got a plate holding him together and he lost an eye from it. If the neighbor hadn't noticed the truck halfway in the road he probably would have died under there.
 
Yes, it was one of those real cheapo Radio Shack ones rated to 240. I just know it was the incident that made me always check the rating plate on all commercial equipment from then on. It didn't injure me, just kind of blew up in my hand.

and thats why cheap meters scare me. The one I have at work is a nice Fluke, and it gets used on 480v circuits regularly. Not interested in a cheapie for that.
 
Warning, don't ever touch the lead on your multi-meter when the other lead is touching a 277V source, hurts like a bitch, don't ask how I know lol.

This reminder me of helping my dad build a moveable wench system in the shop. He was on a ladder welding and lost the ground connection. I grabbed ahold of the pipe he was welding on then grabbed the ground clamp for the welder to wiggle it. That gave me a good shock.
 
We have all done stupid things. We just hate admitting to ourselves or others. Actually I find it easier to admit it to someone else. I hate admitting really dumb mistakes to myself. My favourite mistake is really stupid and I seem to make it about once a year. I am trying to find a bad part somewhere in an amplifier and am using a scope to find the offending part. I sometimes get to a transistor and find the voltages out of line and automatically calculate the power dissipation that must be going on. I then immediately put my finger on the transistor to verify that this little TO92 is actually using 2 watts of power. I come away with the shape of the top of the transistor burned into my finger. It is something I do on automatic mode while troubleshooting. I don't seem to be able to stop myself in time.

Remindes me of my grandpa. We were in his old 70's green Chevy pickup. I was messing around with the cigarette lighter and he said he thought it didn't work. The lighter didn't turn red so he just stuck his finger in it and what do ya know it was hot. Instantly turned the tip of his finger that nice light brown color.
 
As a teen and early 20's I ran hobbystock race car on dirt tracks. The tracks were 3/8 and 1/2 mile mostly. We would change rear end gears between the different tracks (lower gears for the smaller track). Well Sunday night we ran a 1/2 mile track. Let the car set for the week the the next Friday night ran a 3/8 mile track. All night I couldn't figure out we the car didn't have the power it should have. About 10 minutes after the last race it finally hit me. I DIDN'T CHANGE THE GEARS BACK FOR THE SMALL TRACK. my dad and I got a good kick out of that.

Another racing story. Got in a wreck and popped the radiator, of course got fluid all over everything. Replaced the radiator and finished out the night. Got second that night and was happy. The next race we had power issues car wouldn't go fast. Acted like a bad ignition module. Changed it and didn't make a difference. Went through that night. Went to a race the next day and decided to change the whole distributer. Ran hot laps and the heat race and still not right. Then my dad had an idea. He pulled the intake filter and it was still sticky and wet. Changed it and holly cow it was a new car. Filter was so plugged up from the antifreeze it couldn't breath. Won the feature race that night.
 
This is a PC board I made for an amplifier. It took me a while to figure out why it did not sound right. There was a little bit of copper that did not get etched away. I did the layout on the computer, that is a little bit of the box I drew around the layout which got transferred to the copper.
Rogue copper.jpg
Making Boards again.jpg
 
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This is a PC board I made for an amplifier. It took me a while to figure out why it did not sound right. There was a little bit of copper that did not get etched away. I did the layout on the computer, that is a little bit of the box I drew around the layout which got transferred to the copper.
View attachment 1601338
View attachment 1601340

I dont know about anybody else, but it took me forever to see the problem. Definitely hard to find.
 
Not audio related, but I'll never forget installing CV joints backwards on my old VW bus. I was an impatient teenager and the job was a pain in the ass. I finally got it done though and was super excited to give it a test drive. The joints practically exploded! I was amazed that the ball bearings were pushed into the metal casing outside the races.
 
I was installing an amp in the trunk of my Dodge Intrepid and accidentally drilled into the gas tank.:rant: Luckily it was a plastic tank so thankfully no sparks and the repair was a (not so) simple task of dropping said tank and using a patching compound to repair.
 
I was installing an amp in the trunk of my Dodge Intrepid and accidentally drilled into the gas tank.:rant: Luckily it was a plastic tank so thankfully no sparks and the repair was a (not so) simple task of dropping said tank and using a patching compound to repair.

I've seen this so many times. Cars will come in from an installers shop or from a customer with the car either not running or doing something weird that just so happened to start after a stereo installation.
So far I've seen sheet metal or sheet rock screws in the fuel tank, ECM (DME in German speak), Immobilizer control unit, through the Evap canister, through the main wiring harness and a few others that I can't remember right now. All I can say is it's generally costly to repair.
 
I've seen this so many times. Cars will come in from an installers shop or from a customer with the car either not running or doing something weird that just so happened to start after a stereo installation.
So far I've seen sheet metal or sheet rock screws in the fuel tank, ECM (DME in German speak), Immobilizer control unit, through the Evap canister, through the main wiring harness and a few others that I can't remember right now. All I can say is it's generally costly to repair.

How about this one, "why do I need a fuse at the battery, the amp already has one in line with it?" Proceed to run the power wire from the battery through the fire wall to the amp inside the car.

Car is later found on the side of the road burned to the ground lol.
 
On a set of biwire speaker cables, marked red,black,blue, and white, I got mixed up on the connection. All of a sudden my Pass Labs amp wasn’t working with my speakers. 2 hours later and after a long phone call to Pass, I figured out what I did. Such a MORON!
 
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On a set of biwire speaker cables, marked red,black,blue, and white, I got mixed up on the connection. All of a sudden my Lass Labs amp wasn’t working with my speakers. 2 hours later and after a long phone call to Pass, I figured out what I did. Such a MORON!

HUMBLING, it can be ! Yes !
 
Was working with my brother to fix something on my mother's garage door. Disconnected the arm on the opener and watched gravity close the door at a rather high rate of speed...on to a ladder that happened to be in the way. An hour or so of banging away on the smashed door panel got it back into shape except for some extra wrinkles.
 
Recently plugged an amp in thinking it was the soldering iron cord as I was getting ready to work on it. Whats worse is the power switch had broken, and it was now permanently wired to on. Went to short the big filter caps as a safety measure with a screwdriver on the now live amp. Jumped out of my skin with the flash and pop of that discharge I wasnt expecting. New policy- anything I work on- the plug is on the bench next to the device. Just glad I at least take the safety step to short the caps every time even though it had previously been unplugged for a day. :eek:
 
When I was in high school I saved up my nickels and saved up my dimes and bought a 1967 Mustang 289. Well it didn't take long before the transmission was toast. Can't figure out how that happened. :D Anyway I put another transmission and torque converter in it by myself. In those days I could do it by myself. I had changed manuals before but never an automatic. The torque converter cover wouldn't go all the way back to the engine block so I just put the bolts in it and forced it back. I started it up and the transmission wouldn't work. I didn't realize that the torque converter had to line up with the transmission. Live and learn.
 
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