1
Download Technical Service Manual
Transcript
4.2 PL380 Amplifier Main module circuit board assembly Circuit board neighborhoods See input module drawing Ch. 1 neg. gate drive Ch. 1 pos. Ch. 1 output section gate drive Fan Ch. 1 output speed filter network Lower Speakon Ch. 1 output (Ch. 2) output MOSFETs Power supply Binding Upper Speakon control and gate drive TOP switch post outputs keep-alive supply (Ch. 1 and 2) output transformer Top layer AC rectifiers and reservoir capacitors Loss of AC detector Inrush thermistors, relays, and fuse IGBT switches and voltage spike filter HF transformer Power supply section Aux supply— fan and audio EMI filter board PL380 main circuit board, with major circuit sections shown 58 Ch.2 gain pot Ch. 1 temp sensor Ch.1 Ch. 1 & 2 gain pot temperature signal amps Ch. 2 pos. gate drive Ch. 2 output filter network Ch. 2 neg. gate drive Ch. 2 temp sensor Ch. 2 output section Ch. 2 output MOSFETs Class D gate drive power ±25V supplies HF power rectifiers and reservoir caps QSC Audio Products, LLC
