QSC EX1250 free download

File name QSC-EX1250 pwramp.pdf

SH-004101-01 1 K 5-29-91 7-12-91 L G 10-9-91 11-6-91 6-10-92 10-21-92 L G 5-11-94 7-20-94 SGM SGM SGM SGM SGM SGM B C D E F G H J K PROD RELEASE PER ECO 1107 GLF REVISED PER ECO 1127 RDS REVISED PER ECO 1262 REVISED PER ECO 1289 PHQ REVISED PER ECO 1508 SGM REVISED PER ECO 1602 WR REVISED PER ECO 2009 REVISED PER ECO 2371 MP (EFF. 7-28-94) REVISED PER ECO 2506 MP (EFF. 12-09-94) / RAB SGM SGM +23V 0N/OFF ENABLE TO SHEET 2 TRANSFORMER THERMAL SENSOR THERMAL BUS TO FAN SPEED CONTROL SCHEMATIC, 2-CH POWER AMPLIFIER EX 1250 REV E, 11-6-91, FOR PC-004101-00 REV D DOC NO. SH-004101-01 AUDIO AND POWER GROUNDS R 53 3.3-1W HEAT SINK GROUND A SHEET 1, HOUSEKEEPING SUPPLY AND FAN SPEED CONTROL J 51 5 4 XF PTC XF PTC C 52 47-10NP R 51 47K J 52-1 FAN BLK 1 18 Vac RN 51 2.7K +24 V +15 V -15 V -24 V +24 V UNREG 1 +15 V REG 3 -15 V REG 4 -24 V UNREG 2 U 52 C 56 100 35 V C 55 100 35 V 7815 3 2 1 D 51 1N4004 C 53 2200 35V BR 51 2 Q 52 2N2907 C 51 100-35V 24 V BRUSHLESS FAN FAN RED 18 Vac J 52-4 D D 53 1N4746, 18V D 52 1N4746, 18V Q 53 2N4410 2.7K 2.7K R 52 180K A B C 57 .01 3 CT C C 54 2200 35V 2 Q 51 2SC3298B 2.7K 3 1 U 51 7915 -24 V SCHEDULE OF TEST POINTS CH-1 CH 2 J 502-1 ETC J 502-1 J 602-1 NEGATIVE LIMITING VOLTAGE J 502-2 J 602-2 POSITIVE LIMITING VOLTAGE J 502-3 J 602-3 SWITCHING THRESHOLD REFERENCE VOLTAGE J 502-4 J 602-4 AMPLIFIER LOOP OPAMP OUTPUT J 502-6 J 602-6 SWITCHED POS AMPLIFIER RAIL--HIGH VOLTAGE J 502-8 J 602-8 SWITCHED NEG AMPLIFIER RAIL--HIGH VOLTAGE PART NUMBERING SCHEDULE FOR PCBS USED IN EX-1250: PCB NUMBER PC-004001-00 PC-004002-00 PC-004101-00 PC-004104-00 PC-004103-00 DESCRIPTION INPUT PCB AMP PCB SPKR PCB AC PCB CH 1 PARTS CH 2 PARTS PARTS IN COMMON 101-199 301-399 501-599 701-799 201-299 401-499 601-699 801-899 1-29 31-49 51-69 71-99 DISPLAY PCB NOTES. 1. ALL RESISTORS 1/4-WATT, 5% UNLESS NOTED. 2. ALL CAPACITORS 100V UNLESS NOTED. TOLERANCE 20% FOR ELECTROLYTIC TYPES, 10% ON OTHER TYPES. 3. BRIDGE RECTIFIER BR 51, 1.5A, 100V. 4. R 598, 698 IS POSITIVE TEMPERATURE COEFFICIENT RESISTOR MOUNTED TO HEAT SINK. RESISTANCE 100 OHM COLD, RISING AT 55 C. QSC P/N RE-000006-PT 5. Q 503, 504, 603, 604 ARE SWITCHING FETS. QSC P/N QD-000013-00 OR QD-000031-QD. 125 W, 50 V MINIMUM, ON-RESISTANCE 0.030 OHMS MAX. 6. ZENERS D 503, 504, 603, 604 MARKED 7.5 V TESTED FOR LOW LEAKAGE, QSC P/N QD-0007.5-ZT. 7. ZENERS D 509, 513, 609, 613, 6.2V-500mW, TESTED FOR LOW LEAKAGE, QSC P/N QD-000024-QD. 8. PARTS MARKED WITH TRIANGLE MUST BE REPLACED WITH EXACT TYPE ONLY. HAVE VOLTAGES GREATER THAN 42V. 9. PARTS ENCLOSED WITHIN DOTTED OUTLINE +23V 0N/OFF ENABLE 901-UP (SAME BOARD FOR CH 1, CH2) TO SHEET 3 TRANSFORMER THERMAL SENSOR THERMAL BUS TO FAN SPEED CONTROL LAST USED REF. DESIGN. BR 51, BR 502, 602 C51 - 57, C526, 626 D51 - 53, D513, 613 F504, 604 J51, 52, J503, 603 K501, 601 L501, 601 Q51 - 53, Q510, 610 R51 - 53, R544, 644, R598, 698, R599, 699 RN51, RN502, 602 U51, 52, U506, 606 VR503, 603 AUDIO PRODUCTS