Neutrik A1 - Page 1
Forum section: electronics / repair

author: crazynetwork
author_rank: Newbie
timestamp: November 30, 2023, 08:39:47 am
content: Hi all. When the device is short-circuited to itself, it shows a very large THD+N value at 1kH. If you increase the frequency to 3kH, the THD+N value becomes 0.006. What could be the reason? I also ask you to send the service manual to crazynetwork.km@gmail.com. Thank you!

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: November 30, 2023, 08:36:55 pm
content: Hi, you can monitor the error signal (so basically just the distortion part) on the monitor outputs using an oscilloscope. That should give you a clue to what is wrong. Post results.That said, this thing has a linear power supply that has a design flaw. The electrolytic capacitors are right next to a big heat sink and prone to dry out. I would advise you to use a scope to check if there is 100Hz ripple on the power rails. Since these devices date back to the 90s, I wouldn't be surprised if those caps are dry.

author: srb1954
author_rank: Super Contributor
timestamp: December 01, 2023, 05:59:37 am
content: Try switching the 400Hz HPF while measuring the 1KHz distortion.If this results in a drop in the measured distortion level it could indicate that the O/P signal from the generator is contaminated by ripple on the PSU rails.

author: crazynetwork
author_rank: Newbie
timestamp: December 01, 2023, 08:32:06 am
content: When 400Hz HPF is turned on, the noise decreases but not significantly.

author: crazynetwork
author_rank: Newbie
timestamp: December 04, 2023, 08:18:19 am
content: Help with a service manual if anyone can!

author: crazynetwork
author_rank: Newbie
timestamp: December 18, 2023, 08:23:18 am
content: HELP pls!

author: crazynetwork
author_rank: Newbie
timestamp: February 14, 2024, 12:59:50 pm
content: Hi all. Kind people sent me a service manual for the A2 model. But still I need it from the A1 model. Please share the service manual or diagram from Neutrik A1. Thank you.crazynetwork.km@gmail.com

author: Martin72
author_rank: Super Contributor
timestamp: December 02, 2024, 07:51:46 pm
content: Hello,I only just saw this thread.Here is the service and calibration manual for the A1 model:https://drive.google.com/drive/folders/1hIuFYlEY7q9-1mc1uUQt99fMPT4ylPkJ?usp=sharingThe software for the A1 is also included.(Should work with DOS box)

author: crazynetwork
author_rank: Newbie
timestamp: December 04, 2024, 10:29:51 am
content: Thanks a lot! You are the best!

author: schenkmi72
author_rank: Contributor
timestamp: December 08, 2024, 05:29:38 pm
content: Hi folks,someone willing to share the Neutrik A2 service manual with me ? Many thanks in advance

author: 707dave
author_rank: Newbie
timestamp: December 20, 2024, 09:38:15 am
content: HiIs it possible to make the Neutrik A1 service manual available again , as the link isn’t working?Cheers D

author: Martin72
author_rank: Super Contributor
timestamp: December 24, 2024, 02:41:27 pm
content: Hi,https://drive.google.com/drive/folders/1gRRAVB5rQOxNK3wYl8xcszb7uEfFKd4M?usp=sharing

author: 707dave
author_rank: Newbie
timestamp: January 01, 2025, 09:52:51 am
content: Thankyou very much, that's wonderful to get.Best wishesD

author: German_Angst
author_rank: Newbie
timestamp: June 23, 2025, 08:26:21 pm
content: Hello there,I couldn't find any related discussions online, so I'm hoping to get an idea here.What would be an acceptable price for a visibly used Neutrik A2-D in working condition without calibration and warranty? The web isn't exactly packed with information on the topic, so I figured EEV Blog would be the place to ask first. Even eBay only shows one model from Japan which was auctioned for around 1450€ in the past.Love to see people posting old software and service-manuals here - this is the way!Best regards