D-75 FAQ

D-75 FAQ

I installed an SP-75 and all the lights are flashing. Why?
The module must be installed in its dedicated slot, which is just to the left of the OM-75 module. If the module is installed in any other normal input slot, all its lights will flash to indicate it is improperly installed.
I installed an SP-75 and all the lights are always on no matter what buttons I push. Why?
The module must be installed in its dedicated slot, which is just to the left of the OM-75 module. If the module is installed in one of the utility slots to the right of the SC-75, all its lights will stay on and it will be unable to respond to any of its buttons.
I added an IN-75 and all the lights are always on no matter what buttons I push. Why?
Input modules can be installed in any of the slots to the left of the OM-75 module. If the module is installed in one of the utility slots to the right of the SC-75, all its lights will stay on and it will be unable to respond to any of its buttons.
I moved my OM-75/CR-75/SC-75 and all the lights are flashing. Why?
These modules must be installed in their respective dedicated slots. Because of their unique edge connector configuration there are only three console slots the modules will fit in. They must be installed in the proper order in these slots. Starting from the left of the three slots, the proper module order is OM-75, CR-75, and SC-75. If any of these modules is installed in the wrong slot its lights will flash to indicate it is improperly installed.
I have one SP-75 module. Can I have more phone (caller) inputs?
The D-75 will only support one SP-75 module, which can handle two callers. If you need to handle additional callers, please see our white paper Making The Connection.
I can hear my mics in UTIL even when they’re supposed to be off. Can I change this?
The console comes from the factory with the UTIL bus configured to be fed pre-fade and pre-on by all inputs, except the caller inputs. This feature can be defeated by switching position 4 of the four position dipswitch on the PR-75 board, found in the console’s meterbridge area.
How do I increase the number of mic channels?
The D-75 console has an internal four channel QMP-4 mic preamp card. Mics are connected by wiring the mic to one of the QMP-4 inputs and wiring the corresponding QMP-4 output to an IN-75. A second QMP-4 can be added to allow the use of up to eight mics. If additional mics are needed beyond eight, external mic preamps must be used.
How do I set up talkback from the control room to the studio?
Any D-75 input can be set up to feed the internal talkback bus by turning the channel’s TB TO STU dipswitch on (dipswitches are located at the top of the module, underneath the hinged meterbridge). The audio on this bus interrupts the studio output when the studio TB button on the console is pressed. A TB level control allows you to adjust the volume of the talkback signal.
How do I talk with the caller off line?
Any D-75 input can be set up to feed the internal talkback bus by turning the channel’s TB TO STU dipswitch on (dipswitches are located at the top of the module, underneath the hinged meterbridge). The audio on this bus interrupts the caller 1 feed when the CUE CALLERS 1 button on the console is pressed and it interrupts the caller 2 feed when the caller CUE CALLERS 2 button is pressed.

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