Agilent 34410A No Beep/click - Page 1
Forum section: electronics / repair

author: ramzito
author_rank: Newbie
timestamp: March 30, 2025, 05:53:04 am
content: Hello everyone, this is my first post so hopefully it's in right topic.last year I purchased an agilent DMM 34410A, worked fine but yesterday it froze for a bit, I rebooted the unit but now it takes 20secs for the screen to turn on which I don't think it did before. the unit works fine in all functions but there isNo beep/click in diode mode or continuity mode(also no audible click when you press the buttons).In the utility menu, turning ON or OFF the beeper doesn't do anything.I took apart the unit and could not find any buzzer or piezo. I also spent a lot of time checking the schematic but still I couldn't find the buzzer.Can anyone identify the buzzer circuit so I can test it and any help is welcome for troubleshooting/repair.Thank you

author: coromonadalix
author_rank: Super Contributor
timestamp: March 30, 2025, 07:09:48 pm
content: the 34410 schematics floats on the web, i would check all the psu voltages ...and what fw version you have, there is a few updates toonormally theses boot very fast ...

author: ramzito
author_rank: Newbie
timestamp: April 10, 2025, 04:18:07 pm
content: Hello & thank you for the reply.To follow up on the Unit, I checked all the capacitors with an ESR meter, and they are reading good. All voltages are correct. I spent some more time with the schematic ( attached to this post ), but still, I could not identify the component that beeps, nor could I locate it on the main PCB or screen PCB.The unit itself is behaving strangely, it takes long for the screen to light up (20s to 60s) and sometimes it is necessary to reboot it for it come on. still no beep/click.

author: bdunham7
author_rank: Super Contributor
timestamp: April 10, 2025, 04:40:42 pm
content: The beeper is component E700, found on the 7th schematic sheet in the manual. It is located towards the back of the unit roughly in center, as shown in this photo.Photo from xdevs.com

author: bdunham7
author_rank: Super Contributor
timestamp: April 10, 2025, 04:44:01 pm
content: I wouldn't worry about the piezo buzzer itself right now, you have more serious problems. The first thing to check would be all of the power supply rails. Next I would test all of the SMD tantalum capacitors (rectangular tan units) with an in-circuit tweezers if you have them.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 10, 2025, 06:07:56 pm
content: yep if the display take years to show ..... you have a filament voltage ..have you checked the white connector pinouts voltages, be carefulit is not normal for sure, forget the beeper / buzzer it's more like the logicand what is your serial number, you may have the old unobtanium NEC display driver, if you have all the red plugs ...or you have red and black plugs ...

author: haohaoai
author_rank: Newbie
timestamp: October 02, 2025, 01:30:08 pm
content: I have already located where the buzzer is. I encountered this problem several years ago as well, but I posted about it on a Chinese forum. The component on the far right of this picture is the buzzer.https://www.mydigit.cn/thread-418799-1-1.html

author: haohaoai
author_rank: Newbie
timestamp: October 08, 2025, 10:47:00 am
content: The buzzer in your picture is from the 34401A.