Searching for anyone out there that may know of an inherent problem with Seymour-Duncan’s Quarter Pounder Single Coil; or, can guide me through repairing it. It just went dead. Dead...dead. Suddenly. No Ted Nugent guitar antics, just playing along and it croaked. Where would be the first place you’d look at for a repair. I have it out of the guitar.
Post by blademaster2 on Dec 21, 2019 16:55:33 GMT -5
Well, if it was still in the guitar I would first check switches and controls to see if debris caused them to open circuit on the signal path. If it is out of the guitar you can check with an ohmmeter to see if it is still an unbroken coil (should read below 10,000 ohms typically).
If you have no ohmmeter, then you can take the wires from the pickup and connect them (even with fingers) to the two contacts of a guitar cord plugged into an amplifier (not turned up too loud), and then tap on something that is ferrous (like a screwdriver or other metal object) using, say, a pencil in front of the pickup. It should make the tapping sound come through the amplifier. If that works then the pickup is working - and you can look at the more likely causes of no signal, such as the switches and control knobs (or broken wire in the cavity).
Blade, Unfortunately it’s not measuring squat. And I tried the tap test - nada. I’ve never heard of a guitar pickup just all of a sudden not function in the middle of a song. I know I’m going to have to open it up and repair it. I was hoping someone could give me a couple of tips.
Have you excluded the pig tailsby measuring right at the eyelets? If as you say no output on a tap test and testing open circuit, look at those eyelets for a break. You may get lucky but you'll need even more to reconnect it. I'd need a magnifying glass! Otherwise, I guess it must be open somewhere in the winding. Thousands of turns but which one where? I kind of think that having established that much then I'd be filing it under "B" for bin but other folk are more determined than me. I too have a circa 1980 SD 1/4 pounder, so perhaps it's a ticking time bomb?