Ibanez UV7 - Middle Pickup very thin and weak - Advice? - Jemsite
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post #1 of 31 (permalink) Old 01-05-2019, 10:47 AM Thread Starter
 
Join Date: Jan 2019
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Ibanez UV7 - Middle Pickup very thin and weak - Advice?

Hello all,

All of a sudden I noticed that something is wrong with the middle pickup on my Ibanez UV7 Green Dot. They are all the original Blaze II pickups. I've owned the guitar since the 90s so no idea when or how it might have happened but I think recently and all I've done recently is a setup for a different gauge strings so messing around with the bridge, tremolo springs, etc.

Anyway, the middle pickup sounds very thin and weak. If I touch a screwdriver to any of the pole pieces it make a lot of sound though. I plugged a cable in and measured tip/sleeve for all switch positions and this is what I got rounded off.

Pos1 (Bridge) 15
Pos2 6
Pos3 .5
Pos4 6
Pos5 15

Do you think the middle pickup is broke or is it something else?

Thanks for any help! Cheers,
Howie
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post #2 of 31 (permalink) Old 01-05-2019, 10:50 AM Thread Starter
 
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Re: Ibanez UV7 - Middle Pickup very thin and weak - Advice?

Sorry guys, just noticed there is a specific Pickups section to the forum. I'm new ;-) Not sure how to delete or move it.
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post #3 of 31 (permalink) Old 01-05-2019, 11:06 AM
 
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I agree, the middle pickup has failed, that resistance reading is far too low, there is a short circuit in the coil winding, to double check open the guitar and take a reading directly from the pickup lead.
sepulchrave is offline  
post #4 of 31 (permalink) Old 01-05-2019, 11:29 AM Thread Starter
 
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Re: Ibanez UV7 - Middle Pickup very thin and weak - Advice?

Argh, not the news I wanted to hear. Thanks though Just put new strings on so I'll get to it sometime. Luckily I don't use it anyway except when I'm messing around.

Lucky replacements look to be still available. Or maybe I should have it rewound? Are the new ones just as good, anyone?
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post #5 of 31 (permalink) Old 01-05-2019, 11:48 AM
 
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A new one will be better than an old one, still available from:

https://www.dimarzio.com/pickups/7-string/blaze-middle
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post #6 of 31 (permalink) Old 01-05-2019, 01:53 PM
 
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Re: Ibanez UV7 - Middle Pickup very thin and weak - Advice?

pickups usually don't simply fail. They usually have to have some sort of movement or damage. Typical failure comes from the enamel wire being damage and shorting, or one of the leads of the pickup has come undone internally. if you haven't rough handled your guitar or recently done any work to the other pickups it is unlikely that the pickup is bad.

Since the guitar is older it seems more likely that your switch is starting go out. it is possible that it isn't making good contact in position three. You can try some deoxit/ electronic cleaner , but it seem likely that the contact has simple started to pull away from the switch. You can try wiggling the switch selector a little to see if you get excess static/popping or if the pickup actually starts working.
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post #7 of 31 (permalink) Old 01-05-2019, 02:28 PM
 
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Switch failure doesn't make sense, how would you get a very low resistance reading from a bad switch?
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post #8 of 31 (permalink) Old 01-05-2019, 03:00 PM
 
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Re: Ibanez UV7 - Middle Pickup very thin and weak - Advice?

Quote:
Originally Posted by sepulchrave View Post
Switch failure doesn't make sense, how would you get a very low resistance reading from a bad switch?
he said he was measuring through the switch not the individual pickups. That said if that is not the case, and the actual pickup itself measures weak when you just measure the pickup by itself without anything else and it is weak, then it does sound like a pickup problem. You can send that pickup back to dimarzio and they will fix it. I have had to send in pickups a couple of times and Dimarzio is always amazing about getting the pickup fixed quickly and getting it sent back.
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post #9 of 31 (permalink) Old 01-05-2019, 03:07 PM
 
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I know Dimarzio offer great service in the USA, it's a whole lot trickier if you're an international customer, it's usually cheaper to just buy another one outside of the US.
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post #10 of 31 (permalink) Old 01-05-2019, 05:49 PM
 
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Location: norfolk va
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First thing I would do is spray electronics cleaner in the switch & work it back & forth. If that doesn't work take a look at the solder joints. Pickups seldom fail. Could be a bad switch as well. Those ibby 5 ways are generally not considered as reliable as the fender type switches.
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post #11 of 31 (permalink) Old 01-05-2019, 06:48 PM
 
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Please let us know how you get on, despite all the insistence here there's absolutely no possible way a duff switch will give you such a low DCR of only 0.5k in position 3, it has to be the pickup.
Sorry, but in the immortal words of Judge Judy, if it doesn't make sense then it isn't true.
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post #12 of 31 (permalink) Old 01-05-2019, 07:52 PM Thread Starter
 
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Re: Ibanez UV7 - Middle Pickup very thin and weak - Advice?

Thanks everyone. Just got home and going to try contact cleaner first. The switch was scratchy about a year ago when I started using the guitar regularly again after it had been sitting a long time. But that scratchiness went away after a few uses. Same with the knobs.

I've never taken the pickguard off actually. I just realized I can keep the strings on there and remove the trem by removing the springs and then take the pickguard off...which will be easier.

It hasn't had any rough handling. The only thing is I changed string gauges so I had to do a full setup again. At one point I didn't have the tension right and the springs popped off and banged around in the tremolo cavity...was loud! But I doubt that would do anything to the rest of the guitar.

I'll keep ya posted, thanks again!

Last edited by dolemitehc; 01-05-2019 at 08:08 PM.
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post #13 of 31 (permalink) Old 01-05-2019, 11:37 PM Thread Starter
 
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Re: Ibanez UV7 - Middle Pickup very thin and weak - Advice?

Looks like I'm after a switch. I de-soldered the neck pickup, and tested it...reads 8 - 9...the reading kind of keep going up.

I found the schematic and it looks like everything is still connected where it should be. The fact that the bridge and neck pickups are fine would probably mean everything else is OK right, so it would be down to the switch since the pickup tests fine?

I'm so glad the same switch is still available...and only around $15. I'd rather just fix it now but it looks difficult to get apart? Part number is VLX53


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post #14 of 31 (permalink) Old 01-06-2019, 05:01 AM
 
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Re: Ibanez UV7 - Middle Pickup very thin and weak - Advice?

Quote:
Originally Posted by dolemitehc View Post
...I noticed that something is wrong with the middle pickup...the middle pickup sounds very thin and weak.

Do you think the middle pickup is broke or is it something else?
Quote:
Originally Posted by dolemitehc View Post
I de-soldered the neck pickup, and tested it...reads 8 - 9...the reading kind of keep going up.

The fact that the bridge and neck pickups are fine would probably mean everything else is OK right, so it would be down to the switch since the pickup tests fine?
But....it's the middle pickup that wasn't working?!?
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post #15 of 31 (permalink) Old 01-06-2019, 08:14 AM
 
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This is doing my nut in, middle pickup only should read about 13.5k, not 0.5k, not 8k, not 9k.
All you have to do is wedge the trem and unbolt the neck to remove the pickguard without removing the strings.
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