QSC Audio - DSP-4 RS-232

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Contents

HEAR THE POWER OF TECHNOLOGY Service Bulletin Title Bulletin Issue Date Models Affected Bulletin Bevision Production Bange DSP 4 RS 232 Communication Turn Off Thump DSP0009 July 27 2006 DSP 4 Bev A 05 2001 through 05 2006 serial numbers 0501xxxxx 0506xxxxx Description When a DSP 4 unit is mounted directly to a QSC single DataPort equipped amplifier and the two long screws shown in Figure 1 are tightened the torque bends the two internal PCB boards slightly This causes the leads from U7 a 20 pin DIP microcontroller to touch the top of capacitors C42 and C45 causing communication and audio problems To correct this inadvertent connection trim all 20 of U7 s lead pins Symptoms When mounted directly to a QSC single DataPort equipped ...