Comrex did not purchase Gentner but simply a few specific products, and as such the only Gentner equipment we support or repair is the DH20, DH22 and DH30 telephone hybrids. please be aware that Comrex does not have parts, manuals or support information available for any other Gentner product and is unable to repair or support those units. Download GENTNER COMREX DH-III DIGITAL-HYBRID-3 INSTALL OPERATIONS SCH service manual & repair info for electronics experts. Service manuals, schematics, eproms for electrical technicians GENTNER COMREX DH20 22 DIGITAL-TELEPHONE-HYBRID INSTALL OPERATIONS SCH Download GENTNER COMREX DH-I DIGITAL-HYBRID-1 INSTALL OPERATIONS SCH service manual & repair info for electronics experts. Service manuals, schematics, eproms for electrical technicians GENTNER COMREX DH20 22 DIGITAL-TELEPHONE-HYBRID INSTALL OPERATIONS SCH Looking at the manual for the Comrex DH20, a simple installation is easy. The Aux Out" from the mixer goes to the "send" input on the COMREX. I think your problem stems from the fact that the mackie 1202VLZ3 doesn't have a "balanced" output to send to the "Send" input. You can get a transformer for this at "the Shack." Download GENTNER COMREX DIGITAL-HYBRID INSTALL OPERATIONS SCH service manual & repair info for electronics experts. Service manuals, schematics, eproms for electrical technicians. Preview of GENTNER COMREX DIGITAL-HYBRID INSTALL OPERATIONS SCH [1st page] Click on the link for free download! Document preview [2nd page] now made by Comrex and are generally thought of as reliable! I have reset all the pots to mid-values and the DIP switches are all set to the defaults. I can use a POTS handset through the unit OK. According to the manual the "On" light on the DH20 is supposed to flash when the phone is ringing, which it doesn't do. Manually