Piezoelectric Element
Replacement piezoelectric element for the BeoLink 7000. It restores the wake-on-tap function of the top plate. Fitting it means opening the bottom cover and soldering it to PCB1.
BeoLink 7000 · Open source part
Piezo element
Tapping the top plate wakes the BeoLink 7000, thanks to a small piezo element underneath. When that stops working, the piezo has usually failed with age, and I replace it.
One of my favourite details on the BeoLink 7000 is that you wake it by tapping the top plate (9001). A small piezoelectric element glued under the plate picks up the tap.
It's usually reliable, but the piezo element can fail with age, and that's what had happened on this unit. Tapping the plate did nothing. The service manual traces this fault with an oscilloscope, looking for a wake up pulse on pin 14 of P5 and across the piezo each time the plate is tapped. When the piezo gives no pulses, the element itself has failed.
I replace it with a piezo element that matches the original. It sits under the top plate, reached through the bottom of the remote via PCB1.
PCB1 is attached to the top plate with double sided tape, so it has to be pried loose carefully without bending the plate, which is easy to damage. The new piezo then goes in, with fresh double sided tape under the top plate.
The replacement piezo element is listed under parts. If the top plate itself is scratched or dented, I've also made a new stainless steel top plate.
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More on the BeoLink 7000
BeoLink 7000 overview
Backlight
A weak or dead backlight is the most common fault on the BeoLink 7000. The EL foil behind the display wears out, and I replace it with a new one.
Replacing the batteries in the BeoLink 7000
The BeoLink 7000 has two batteries, the main battery and a lithium coin cell that keeps its settings. Both are long past their life, so I replace both.
Cleaning and lubricating the BeoLink 7000
The display lift in the BeoLink 7000 runs on a small belt, gears and a guide rail. I clean and relubricate the mechanism, fit a new belt and replace the capacitors and fuse on PCB01.
Testing the BeoLink 7000
The BeoLink 7000 has a built in test program. I use it at the end of a restoration to check the keys, the display and the memory.
Stainless steel top plate
The top plate on the BeoLink 7000 is almost always scratched or dented. I replace it with a new plate in mirror polished stainless steel.
Regluing the glass front on the BeoLink 7000
Now and then the adhesive between the glass front and its plastic frame starts to let go on a BeoLink 7000. As long as it hasn't come off completely, a syringe of thin superglue fixes it.
When a new backlight foil doesn't fix a BeoLink 7000
A BeoLink 7000 still had no backlight after I fitted a new EL foil. The cause turned out to be a failed transistor in the backlight oscillator.
Want one for your BeoLink 7000?
Tell me about your BeoLink 7000 and I'll get back to you.