QSC ISA 800T - Manuals

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) Test equipment required: • Oscilloscope• 2-ohm resistive load (rated for at least 1200 watts)• Wire or other means of shorting the amplifier output• Variable AC...

3 ISA0001 unsolder and remove it. Install and solder a new zener diode oriented in thesame direction. Do the same with diode D210. 11. 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-...

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 Table 1. 7 . Next, measure the DC voltage across R247. Adjust bias trimpot R231 to reach the correct voltage shown in Table 1. 8 . ...