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EV ZLX Series Input Board

Locating a replacement input PCB board for the EV ZLX series speakers can be difficult. Here’s where I found the part I needed.

The back panel of an EV ZLX-12P

Both of the XLR combo inputs on the back of my EV ZLX-12P powered speaker were blown. The previous owner had connected an amplified signal into the line level input. In layman’s terms, that’s bad.

Everything on the PCB looked fine, but somewhere in the input board circuit something was fried. The 1/8″ stereo aux input still worked, which told me the amplifier board was still working correctly. So I simply needed to replace the input board.

Easy, right? Nope.

Trying to find just the input board and not the entire back of the amplifier was very tough. Most of the places I was finding online were in the UK. The price of superfluous parts plus international shipping was nearly the same price as buying a new speaker. It was hardly worth fixing.

That is, until I found a Canadian supplier that sells the input board separately. I found it buried in a Bosch parts list. In case you need the same part I did, here’s the contact information you need…

Taylor Electronic Services Inc.
2075 – 16th Ave. E.
Owen Sound, ON, N4K 5N3
Tel: (519) 371-7710
Toll Free: (888) 371-0779
Fax: (519) 371-0813
admin.proav@tescanada.com
www.tescanada.com

Ask them for this part…

Description: ZLX Input PCB Assy.
OEM Part #: F.01U.294.654
TES Part #: 12854
Price: $98.00 CDN / $76.00 USD
(price as of Oct. 2018)

This little thing is surprisingly hard to find.

This input board will fit both the ZLX-12P and ZLX-15P powered speakers. I’m not sure if it works with the ZLX-12BT and ZLX15BT models or not, but I would assume that there’s either a different input board or additional Bluetooth board for those models. This board is definitely not needed in the ZLX-12 and ZLX15 passive speaker models.

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FIX: Neumann KMS 105

Inconsistent audio signal from your KMS105? The fix might be really simple. Here’s how I fixed one.

My wife Katie Nelson and I both use Neumann KMS 105 condenser microphones for live performance. We love how the microphones sound and trust the Neumann brand.

The Problem

Recently Katie’s microphone was passing audio inconsistently. Sometimes it was normal, sometimes the output volume was quieter, and sometimes it would crackle as if the XLR cable was bad.

I called Sennheiser, the parent company of Neumann, to inquire about repairs. They connected me directly with a bench technician who kindly asked questions about the symptoms and then walked me through the fix. He correctly suspected that the hex screws holding the capsule to the internal printed circuit board (PCB) were loose. In fact, the capsule was completely disconnected from the PCB. I was surprised that the microphone worked at all considering there was almost no contact between the capsule and PCB.

PRO TIP: Microphones work best when the capsule is physically connected. #signalflow

The Fix

  1. Take out the machine screw on the side of the microphone that holds the XLR insert in place. There may be a small lock washer underneath the screw. Set them aside.
  2. Unscrew the basket (or grille, as people often refer to it).
  3. Slide off the black capsule cover screen.
  4. Very carefully pull on the capsule while simultaneously pushing on the XLR insert. WARNING: BE VERY CAREFUL WITH THIS STEP. THE PCB HAS A SERIES OF WAVY CUTS IN IT. TOO MUCH PUSHING OR PULLING CAN BREAK THE PCB. GO SLOW. GO EASY.
  5. Pull back the rubber ring around the brass capsule body. Remember the orientation of the ring in reference to the notch in the body.
  6. Confirm that spring is seated properly on the capsule center pin.
  7. Push the capsule body onto the PCB until fully seated. The hex screws should be positioned over the solder-tinned holes.
  8. While holding the capsule and PCB together in that position, use a 0.035″ (0.89mm) hex key to tighten down the tiny set screws.
  9. Replace the rubber ring. Make sure the orientation of the ring fits into the notch in the body.
  10. Carefully insert the assembly back into the body. Again, be very careful. You will likely need small pliers/grips/etc. to pull the XLR insert all the way into position while simultaneously pushing the capsule into the body.
  11. Tighten the screw through the body into the XLR insert.
  12. Slide the capsule cover screen onto the capsule.
  13. Screw the basket onto the body.
  14. Test the microphone. If you still are experiencing audio problems, contact Sennheiser for service.
Little parts are easy to break. Be especially careful with this section.
Affiliate Links

Disclaimer: The links to the hex key and microphone above are Amazon affiliate codes. By clicking through and purchasing, I receive a small kick back. Thank you for your support.

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Cheap RGB LED Par Can Light Fix

Sometimes the solution is easy. Maybe the wires are just crossed.

A while ago I picked up a set of RGB LED par can lights from a friend. They are unbranded, but I did a little searching online. Turns out they are sold under the brand TMS, which I think stands for T-Motorsports, but can’t be certain.

They are just generic, low-cost lights that you can buy in packs of 20, 10, 8, 4, 2, and even 1. They’re super-affordable, small, and get the job done.

I haven’t really used them yet. In some recent tests I noticed one of the fixtures did not seem to be addressed the same as all of the others.

picture showing the lights not working properly

BEFORE: The can lit green should be lit red like the rest of them.

After confirming that the problem was that the red and green channels were flipped, I figured it was a problem that could be fixed easily. I opened up a good light and a bad light to compare the wiring.

side by side comparison of good and bad can lights

On the left is a properly functioning can light. On the right is the can light with the red and green channels switched.

It might be hard to see in the picture above, but the blue and black wires coming from the control PCB were soldered to the LED PCB backwards at the factory. I fired up the soldering iron and swapped the connections.

interior shot of wires before and after modification

Shown above are the black and blue wires before and after the switch.

Here are the all the lights functioning as expected after switching the wires.

picture of the 10 lights working correctly

AFTER: All 10 cans working properly.

So, yes, you get what you pay for. Cheap, unbranded lights might not be wired correctly at the factory. But sometimes good enough is good enough and a little know-how can keep the show on the road.

WARNING: Always be careful working on electronics. Unplug the power before opening things up. Don’t touch stuff on the inside. Be very cautious. You can be killed or seriously injured if you don’t know what you are doing. Prior to any electrical work consult with your local electrician, doctor, lawyer, and priest.

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How to Fix a JBL EON10 G2

So your JBL’s are rattling when you pick them up, eh? Getting that uneasy feeling about that clunky noise when you move them? If it’s the same unsettling noise I heard, then I have an easy fix for you. 1. Disconnect the speaker from all power sources.* 2. Place the speaker face down and open […]

March 28th, 2008 | Friends, Technology | , | Comments: 1

So your JBL’s are rattling when you pick them up, eh? Getting that uneasy feeling about that clunky noise when you move them? If it’s the same unsettling noise I heard, then I have an easy fix for you. 1. Disconnect the speaker from all power sources.* 2. Place the speaker face down and open up the shell by unscrewing all the screws around the outside edge. There’s like a million of them, so use a power drill with a long #2 phillips driver bit. 3. Lift the shell off and set it aside. Be careful not to lose any of the screws. 4. Locate the magnet coil and tighten the bolt that runs through the center.
5. Replace the shell. 6. Tighten all screws. 7. Enjoy your clunkless speakers. NOTE: I am NOT a licensed repairman, electrician, or lawyer. I have no idea if fixing this problem will void your warranty, so don’t blame me if/when JBL won’t service your speakers. Nor will I assume responsibility for you doing something stupid while dinking around with dangerous electronics. Make sure you unplug the speaker first and don’t touch anything inside. If you kill the speaker or yourself, I am not liable.

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