Fostex-NF1A-as-sm维修电路原理图.pdf

NF-1 NF-1A Service Manual Model NEAR FIELD STUDIO MONITOR SPEAKER SYSTEM or, placed in a built-in installa- tion, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings. Heat - The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances (including amplifiers) that produce heat. Power Sources - The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance. Grounding or Polarization - The precautions that should be taken so that the grounding or polarization means of an appliance is not defeated. Power Cord Protection - Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience recep- tacles, and the point where they exit from the appliance. Cleaning - The appliance should be cleaned only as rec- ommended by the manufacturer. Nonuse Periods - The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time. Object and Liquid Entry - Care should be taken so that objects do not fall and liquids are not spilled into the en- closure through openings. Damage requiring Service - The appliance should be ser- viced by qualified service personnel when: A. B. C. D. E. Servicing - The user should not attempt to service the ap- pliance beyond that described in the operating instruc- tions. All other servicing should be referred to qualified service personnel. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, FULLY INSERT. POUR VITER LES CHOCS LECTRIQUES, INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRE- SPONDANTE DE LA PRISE ET POUSSER JUSQU AU FOND. CAUTION: ATTENTION: The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and mainte- nance (servicing) instructions in the literature accompanying the appliance. The lightening flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the products en- closure that may be of sufficient magnitude to constitute a risk of electric shock to persons. “WARNING” “TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS- TURE.” 1. 2. 3. 4. 5. 6. 7. 8. The power supply cord or the plug has been damaged; or Objects have fallen, or liquid has been spilled into the appliance; or The appliance has been exposed to rain; or The appliance does not appear to operate normally or exhibits a marked changed in performance; or The appliance has been dropped, or the enclosure damaged. 9. 10. 11. 12. 13. 14. 15. 16. 17. NF-1A Block Diagram INPUT (UNBAL) -10dBV INPUT (BAL) +4dBu 1: GND 2: HOT 3: COLD +3dB LO FREQ. 60Hz -3dB HIGH FREQ. 10kHz +3dB -3dB3kHz OFF HI-MID ATT. VOL HF POWERTWEETER WOOFERLF POWER TWEETER LEVEL -3dB 0dB0dB ON 19 RadioFans.CN 收音机爱 好者资料库 NF-1 & NF-1ANF-1 & NF-1A Input PCB 3 2 84 1 5 7 6 5 7 6 5 7 6 3 2 84 1 17 19 1618 20 S110D 7 9 68 10 2 4 13 21 22 5 17 19 1618 20 2 4 13 21 22 5 1 3 2 7 8 3 2 84 1 3 2 1 5 4 3 2 1 5 4 J101 INPUT (UNBAL) INPUT (BAL) -10dBV +4dBu J102 1 4 C50 JUMPER 3 R106 10K 2 8 7 3 2 4 5 1 R108 8.2K C102 10/16 C101 10/16 L102 BEAD R102 20K R101 20K R103 20K L101 BEAD R107 10K R104 20K +15V C105 1/50 C106 1/50 -15V C51 NON U101A BA4560N C104 47p CER C103 47p CER C107 10/16 R105 47K C111 0.027 PES C117 0.027 PES R110 39K R111 82K S110B R113 1M R114 43K R112 430K U101B BA4560N C120 10/16 R115 47K C131 10/16 R131 10K R132 10K C134 0.0022 PES R136 20K R133 6.8K C113 1/50 -15V +15V R134 18K R135 4.7K U102A BA4560N C112 1/50 S130A R121 47K C122 0.015 PES R122 3K C118 10/16 R123 3K C123 0.015 PES C124 0.015 PES U102B BA4560N R124 1.6K R127 470 R125 1K C125 NON R126 4.7K C126 10/16 R128 47K S120A VOL. R140 10KA C121 10/16 U103B BA4560N R139 47K R129 4.7K R120 4.7K -15V 1 2 J103 TO POWER LED J104 TO POWER AMP 1 2 3 4 5 +15V R117 2K C119 NON C132 1/50 +15V U103A BA4560N R141 10KB C115 10/16 C133 1/50 R116 47K -15V R118 3K C114 1/50 R119 1.6K TWEETER LEV. HI-MID ATT. OFF ON HI-FREQ.+3dB 0dB -3dB LO FREQ. +3dB 0dB -3dB C136 10/16 S130D R137 20K C135 NON S110A TABLE OF CONTENTS NF-1 owners manual: 8288457000 (for export & domestic model) NF-1A owners manual: 8288459000 (for export model) : 8288460000 (for domestic model) Parts List, exploded views and circuit diagrams are given in this manual to assist the service technician in maintaining the Model NF-1 & NF-1A. NOTES The following accessories are supplied with NF-1 as the standard accessories.* * Following is the packing material for the Model NF-1.* Carton, inner, 3 pads, NF-1: 8228739000 Carton, outer, NF-1: 8228917000 Sheet, mirror: 8216729000 1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. CONTROLS, INDICATORS & CONNECTORS . . . . . . . . . . . . . . 3. EXPLODED VIEW, PCB ASSEMBLY & PARTS LIST . . . . . . . . 4. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 4 6 7 17 Following is the packing material for the Model NF-1A.* Carton, inner, NF-1A: 8228738000 Carton, outer, NF-1A: 8228916000 Packing, side, NF-1A: 8228466001 Packing, front, NF-1A: 8228466002 Sheet, mirror: 8216729000 183 RadioFans.CN 收音机爱 好者资料库 NF-1 & NF-1ANF-1 & NF-1A 417 1. SPECIFICATIONS Enclosure system2-way bass-reflex system Drivers160 mm HP woofer x 1 (low-leakage type) 20 mm Soft-Dome tweeter x 1 (low-leakage type) Impedance8 Frequency Response50 Hz 40 kHz Crossover Frequency10 kHz Sound Pressure Level89 dB/W (1 m) Input (Program)120 W Enclosure volume11 liters WeightApprox. 9.1 kg NF-1 Specifications and physical appearance are subject to change without notice for product improvement. 4000020000100005000200010005002001005020 80 90 70 60 50 40 30 20 100 10Hz dB 10 Second Distortion Third Distortion 30 60 4000020000100005000200010005002001005020 90 100 80 70 60 50 40 30 110 10Hz dB 8 16 32 4 274 mm 267 mm 340 mm 240 mm NF-1 Dimensions 4. CIRCUIT & BLOCK DIAGRAMS Power Amp & SW PCB 1 2 4 5 6 7 8 9 10 11 1 1 1 3 2 84 1 5 7 6 3 1 2 1 1 F1 FUSE C506 47p CER R507 10K U502 LM3886TF IN+ OUT3 +V IN- +38V +V NC GND MUTE-V R506 150 C505 1/50 C509 0.1 PES R509 10 NC NC R505 1K C508 220p CER -38V R508 20K TO LF SPEAKER J502 TO HF SPEAKER 1 2 3 4 R515 10K C513 47p CER 1 2 4 5 6 7 8 9 10 11 U510 LM3886TF IN+ OUT3 +V IN- +38V +V NC GND MUTE-V NC NC -38V C517 0.1 PES R516 20K C516 220p CER U501B BA4560N C511 0.0022 PES R512 1K C512 100/16 R510 10K R511 10K C510 0.0039 PES R504 20K R503 10K C503 0.01 CER U501A BA4560N C504 0.01 CER C502 0.0022 PES +15V -15V C501 0.0022 PES +15V -15V 1 2 3 4 5 W501 TO INPUT R517 10 R513 130 +15V -38V C008 100/16 R004 270 1/2W RF +38V U001 DTC114ES R003 470K Q001 2SD1200F C002 4700/63 D002 MTZJ15 C006 10/16 C004 1/50 R001 4.7K C007 10/16 D003 MTZJ15 Q002 2SB889F-15V R002 4.7K C005 1/50 C003 4700/63 -38V R005 270 1/2W RF C013 NON D001 GBU6D CONN-M-03 C014 NON J501 1 2 3 1 2 3 T1 TRANSFORMER POWER W6 100V: GRY 120V: BRN 230V: VIO S1 SW POWER W3 W5 W4 C011 0.0047 C012 NON L1 BEAD 6H L2 BEAD 6H J001 AC IN 230V: 1A 100/12V: 3.15A W1 BRN BRN WHT GND RadioFans.CN 收音机爱 好者资料库