NuTone NM Series Radio Intercoms are Generating more Question

Over the past year we are being asked more and more questions regarding NuTone NM Series of Radio Intercoms.

Most of these questions are about what seem to be common problems that we have seen since the NM Series was introduced. 

Since it is very likely that the NM Series wil be replaced with newer models some time in the Fall of 2017, it seems like a good time to begin building the technical knowledge base for the NM Series.  Since there are no technical documents or service information for the NM100 or NM200, it will be up to us to create this information.

I have begun this process and I have created a new YouTube Playlist for the NuTone NM100 and NM200 Series.

Initially there will be 3 Videos:

Video #1:  An Overview of the NM100 Master Station

Video #2:  A Tear Down of the Circuit Boards in the NM100

Video #3:  An Attempted Repair of the Backlight Failure on a NM100

Update on Thursday, August 18, 2016 at 8:36AM by Cindy & Christopher

Tearing Down a NuTone NM100 RAdio Intercom Master Station

This is the second Video in this series.  

In this Video I disassemble a NuTone Model NM100 Radio Intercom Master Station and have a look at the 3 circuit boards that make up the NM100

These circuit boards include:

1.  Main Power Supply - Amplifier Board

2.  Audio - Intercom Control Board

3.  Display - Micro-Controller Board

I include circuit board numbers for each board and I have a look at the important different IC's on each board.

What you will find out about the NM100 is that it is not a ground-breaking design.  It's populated with a variety of common IC's and features a fairly unimpressive amplifier design.

Update on Tuesday, September 6, 2016 at 9:11AM by Cindy & Christopher

NuTone NM100 Intercom LED Backlght Repair.

One of the most common problems with the NuTone NM Series of Radio Intercoms (includes both the NM100 and NM200) is a failure with the backlight LED's for the display panel.

This 3rd Video shows some of the basic information about how the Backlight circuit works and I was able to resolve the problem with the LED's

Since the NM100 and NM200 are very similar in respect to the backlight problem, this repair will apply to both models.