QSC DCM-1 User Manual
Also see for DCM-1: Specification sheet
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29TROUBLESHOOTINGIf the DCM Manager program is unable to communicate with the DCM hardware...• Verify the RS-232 cable connections. Re-seat each cable-end and finger-tighten connector retainingscrews.• Make sure the 9-pin serial data cable (RS-232 cable) is a normal type cable. “Null-modem” or other“special” cable will not work with the DCM.• Try a known-good serial data cable, if possible.• Verify the COM port selection in the DCM Manager program. Port selection is automatic, but it is possiblethat incorrect auto-selection is preventing communication.• Confirm the serial port (COM port, RS-232 port) you are using is operating properly. Windows has provi-sions for checking hardware in the Windows Control Panel. Refer to the Windows help system for moreinformation.• Cycle the power of both the PC and the DCM.• Check that no other program or utility is using the specified COM port.If there is no audio from the front panel Monitor Speaker....• Check the Monitor Volume control; it should be set to a useful level, not fully counterclockwise.• Verify the desired active monitor source is selected by pressing the AMPS/PROC selector button andobserving the illuminated LEDs beneath channels selected for monitoring. Select or deselect your desiredmonitor sources.• Try just selecting the center channel of the Cinema Processor input (select PROC, then select C using thefront panel push-button controls). If there is a center channel input signal connected to the FROM PROCES-SOR OUTPUT connector on the rear of the DCM, it should be audible now. If not, continue with the nextstep.• Verify the connections of the Cinema Processor cable. This is the cable that connects the CinemaProcessor’s outputs to the DCM’s inputs (the FROM PROCESSOR OUTPUT connector). Re-seat each cable-end and finger-tighten connector retaining screws.• Make sure that an active film score is playing and the center channel output of the Cinema Processor isfunctioning.• If the sound is audible, but all attempts to get it louder fail, connect the DCM to a PC running DCMManager software and check the Monitor Gain Levels settings on the Mute/Monitor tab. These settingshave an attenuation range of 0 to -16 dB. |
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