Need a newer DRO readout that works with my older glass scales

Hobby Racer · Jul 23, 2020

I have a QMS 800 DRO and QMS 500 glass scales on my Bridgeport Series 1. The DRO is not functioning correctly but the scales are good. I am looking to replace the DRO head and need to know the specs for the scale encoders so I can match up my scales to a newer DRO readout. Does anyone have the schematics for either the DRO head or the scale encoders or simply know what each pin is used for? Here are some pics of the DRO head and encoders

Thanks for any information you might have.

hitandmiss · Jul 23, 2020

If you post better pictures of the reader head, I will see if it was the model that used a light bulb.

These guys have/had adapter cables for between systems: Welcome to A Tech Authority

Bill