QSC Audio ISA 750 manual

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Table of contents for the manual

  • Page 1

    1 ISA0001 T itle: ISA T urn-on Hangup Bulletin #: ISA0001 Issue Date: April 4, 200 2 Models Affected: ISA 750, 800T , 450, & 500T Bulletin Revision: A Production Range: 01/2000–04/2002 (serial # 0100xxxxx–0402xxxxx) Ser vice Bulletin Description The circuitry that controls protective current cutback in ISA amplifiers may in some instances c[...]

  • Page 2

    2 ISA0001 • Desoldering equipment or solder braid • Four 4.7-volt ¼ -watt zener diodes (Microsemi DZ840731ET/R; QSC part number QD-0004.7-ZT) T est equipment required: • Oscilloscope • 2-ohm resistive load (rated for at least 1200 watts) • Wire or other means of shorting the amplifier output • V ariable AC transformer (e.g., Variac, Po[...]

  • Page 3

    3 ISA0001 unsolder and remove it. Install and solder a new zener diode oriented in the same direction. Do the same with diode D210. 1 1. Check your work. Don ’ t reattach the channel module assembly and heat sink to the chassis yet. Instead, continue with the bias and current-limit calibration. New 4.7-volt zener Old 5.6-volt zener s n o i t a r [...]

  • Page 4

    4 ISA0001 and wait until it cools down to about room temperature. 6 . Measure the DC voltage across R147. Adjust bias trimpot R131 to reach the correct voltage shown in T able 1. 7 . Next, measure the DC voltage across R247. Adjust bias trimpot R231 to reach the correct voltage shown in T able 1. 8 . T urn off the amplifier and reattach the channel[...]