MJLorton Solar Power and Electronic Measurement Equipment Forum

Older Technology => Older Technology => Topic started by: SeanB on September 26, 2013, 04:07:49 PM

Title: Fax modem teardown
Post by: SeanB on September 26, 2013, 04:07:49 PM

Here is an old Fax modem, removed from service years ago, and now going to the Ewaste pile.

(http://farm8.staticflickr.com/7388/9914526113_ce33012d03.jpg) (http://www.flickr.com/photos/33277124@N08/9914526113/)
IMG_1308 (http://www.flickr.com/photos/33277124@N08/9914526113/) by SeanB_ZA (http://www.flickr.com/people/33277124@N08/), on Flickr

Supra 28.8k fax modem, made in Canada.

(http://farm3.staticflickr.com/2842/9914444244_a18779522c.jpg) (http://www.flickr.com/photos/33277124@N08/9914444244/)
IMG_1309 (http://www.flickr.com/photos/33277124@N08/9914444244/) by SeanB_ZA (http://www.flickr.com/people/33277124@N08/), on Flickr

Front panel, the knob broke a while ago.

(http://farm3.staticflickr.com/2846/9914408266_d8191ba903.jpg) (http://www.flickr.com/photos/33277124@N08/9914408266/)
IMG_1310 (http://www.flickr.com/photos/33277124@N08/9914408266/) by SeanB_ZA (http://www.flickr.com/people/33277124@N08/), on Flickr

All Rockwell chips inside. PSU at the top, and unlike most this one is happy to run off 9VDC, as it uses a voltage inverter chip ( ICL7660) to make the RS232 voltages.

(http://farm8.staticflickr.com/7410/9914425525_bde4ee9523.jpg) (http://www.flickr.com/photos/33277124@N08/9914425525/)
IMG_1315 (http://www.flickr.com/photos/33277124@N08/9914425525/) by SeanB_ZA (http://www.flickr.com/people/33277124@N08/), on Flickr

Interesting way to connect to the front panel, use a pin header and solder it to the board.

(http://farm6.staticflickr.com/5526/9914540594_22ca50708a.jpg) (http://www.flickr.com/photos/33277124@N08/9914540594/)
IMG_1318 (http://www.flickr.com/photos/33277124@N08/9914540594/) by SeanB_ZA (http://www.flickr.com/people/33277124@N08/), on Flickr

Nice LED displays.

(http://farm8.staticflickr.com/7448/9914550734_b315265654.jpg) (http://www.flickr.com/photos/33277124@N08/9914550734/)
IMG_1320 (http://www.flickr.com/photos/33277124@N08/9914550734/) by SeanB_ZA (http://www.flickr.com/people/33277124@N08/), on Flickr

Has some bad chips inside, has been getting worse for years, started with only one bad dot now is in both displays.

(http://farm4.staticflickr.com/3801/9914492405_8bb6fb022c.jpg) (http://www.flickr.com/photos/33277124@N08/9914492405/)
IMG_1323 (http://www.flickr.com/photos/33277124@N08/9914492405/) by SeanB_ZA (http://www.flickr.com/people/33277124@N08/), on Flickr

Display self test on power up shows the dead digits, along with my shoe.

Title: Re: Fax modem teardown
Post by: steve30 on October 01, 2013, 12:41:46 PM

I like the look of those LED displays :)

Title: Re: Fax modem teardown
Post by: TechJunkie on November 04, 2013, 07:30:35 PM

Awesome! I had one of those back in the day!

Title: Re: Fax modem teardown
Post by: MJLorton on November 11, 2013, 11:59:30 AM

What a blast from the past! I used to run my BBS off a Zoom 14400 modem...back in the day....