Source for replacement piezo buzzer? (Fluke 117)

[iXod]

Piezo died in Fluke 117.

Where can I source a replacement piezo buzzer? Fluke no help.

Cheers.

[iXod]

New info:

There is no signal going to the piezo. Removed the Piezo, scoped the pads and enabled 2 modes (Non-Contact Voltage Detect; and Continuity) but nothing seen.

Traces go back to CD4069UBC hex inverter. Here's the mind-bending thing to me: an inverter is connected *across* the piezo:

There are no other connections to the piezo's pads (ie, on the flip side of the board). The many vias at the top of the board is part of the non-contact voltage detector.

Am I losing my brain? When is it good design sense to put an inverter across a piezo? What the...?

Cheers.

[Gyro]

Connecting an inverter across a Piezo is normal practice to improve its volume - one side goes up, the other side goes down, effectively doubling the voltage swing. Your problem is whatever is failing to feed the inverter with a signal.

I notice that you have double posted this thread in the Test Equipment section too. That's never a good idea because people end up answering both of them and it gets annoying. I suggest you terminate one of the threads (probably this one as several people have answered the other one), and change the title to 'MOD please delete'. The other thread is: https://www.eevblog.com/forum/testgear/source-for-replacement-piezo-buzzer-%28fluke-117%29/

[iXod]

duplicate post.
[op]

[vbalint]

I suppose the 4069 forms an oscillator with the R49/R50/C34 and it is also a driver. I'm pretty sure that the pin 6 of the 4069 is connected to the pin 9. From pin 9 an inverter is also driven which outout is pin 10. An interesting detail is that the GND of the 4069 is switched with Q11.

If the buzzer is otherwise good it is most probably the 4069 what went wrong.