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Service Manual
Model
NF-1 & NF-1A
NEAR FIELD STUDIO MONITOR SPEAKER SYSTEM
FOSTEX CORPORATION 3-2-35 Musashino, Akishima, Tokyo, Japan 196-0021 FOSTEX CORPORATION OF AMERICA 15431 Blackburn Ave., Norwalk, CA 90650, U.S.A.
© PRINTED IN JAPAN FEB. 2000 8288790000
NF-1 & NF-1A
HF POWER TWEETER
NF-1 & NF-1A
CAUTION
RISK OF ELECTRIC SHOCK DO NOT OPEN
CAUTION:
TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, FULLY INSERT.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
ATTENTION:
POUR ÉVITER LES CHOCS ÉLECTRIQUES, INTRODUIRE LA LAME LA PLUS LARGE DE
TWEETER LEVEL
LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER JUSQU' AU FOND.
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 product's enclosure 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 MOISTURE."
-3dB
SAFETY INSTRUCTIONS
2. 3. 4. 5.
HIGH FREQ. 10kHz +3dB 0dB -3dB +3dB 0dB
1.
6.
13. 14.
7.
8.
An appliance and cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces may cause the appliance and cart combination to overturn. Wall or Ceiling Mounting - The appliance should be mounted to a wall or ceiling only as recommended by the manufacturer. Ventilation - The appliance should be situated so that its location or position does not interfere with its proper ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings.
16.
NF-1A Block Diagram
-3dB
15.
LO FREQ. 60Hz
Read instructions - All the safety and operating instructions should be read before the appliance is operated. Retain instructions - The safety and operating instructions should be retained for future reference. Heed warnings - All warnings on the appliance and in the operating instructions should be adhered to. Follow instructions - All operating and use instructions should be followed. Water and Moisture - The appliance should not be used near water - for example, near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, and the like. Carts and Stands - The appliance should be used only with a cart or stand that is recommended by the manufacturer.
9.
10.
11.
12.
17.
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 receptacles, and the point where they exit from the appliance. Cleaning - The appliance should be cleaned only as recommended 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 enclosure through openings. Damage requiring Service - The appliance should be serviced by qualified service personnel when: A. The power supply cord or the plug has been damaged; or B. Objects have fallen, or liquid has been spilled into the appliance; or C. The appliance has been exposed to rain; or D. The appliance does not appear to operate normally or exhibits a marked changed in performance; or E. The appliance has been dropped, or the enclosure damaged. Servicing - The user should not attempt to service the appliance beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel.
3kHz
HI-MID ATT.
OFF
ON
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.
VOL
LF POWER
WOOFER
INPUT (UNBAL) -10dBV
INPUT (BAL) +4dBu 1: GND 2: HOT 3: COLD
19
NF-1 & NF-1A
TWEETER LEV.
J104 TO POWER AMP 1 2 3 4 5 J103 TO POWER LED 1 2
NF-1 & NF-1A
U103A BA4560N
R141 10KB 4
R119 1.6K
C114 1/50
C119 NON
+15V C132 1/50
C133 1/50
+15V
7
R120 4.7K
-15V
2
5
R117 2K
1
-15V
R118 3K
U103B BA4560N
R116 47K
R139 47K R129 4.7K
2
3
6
5
C115 10/16
C121 10/16
VOL.
R140 10KA 5
2
HI-MID ATT. OFF
ON
4
2
S120A
R127 C126 1 470 10/16 3
R125 1K
C125 NON
R128 47K
7
U102B BA4560N C123 0.015 PES R124 1.6K
6
5
C118 10/16
R122 3K
C122 0.015 PES
HI-FREQ. +3dB
0dB -3dB
S130D
R121 47K
16 20
C124 0.015 PES
R123 3K
R134 18K
R126 4.7K
U102A BA4560N
C136 10/16
R135 4.7K
17 18 19
+15V
1
2 3 4
-15V S130A
R137 20K
C112 1/50
C135 NON
C113 1/50
C134 0.0022 PES R136 20K
2
3
1 5
R133 6.8K
R131 10K
LO FREQ. +3dB
0dB -3dB
S110D
C131 10/16
R132 10K
16 20
R115 47K
17 18 19
U101B BA4560N
7
C120 10/16
6
5
R112 430K
S110B
R111 82K
C117 C111 0.027 PES 0.027 PES
S110A 21
22
R113 1M
R114 43K
R110 39K
C107 10/16
R105 47K
R104 20K
C105 1/50
C104 47p CER
+15V
C106 1/50
1
U101A BA4560N 2
-15V
C103 47p CER
3
C51 NON
L102 BEAD C102 R102 10/16 20K
R101 20K
C101 L101 10/16 BEAD
R103 20K
R107 10K
Input PCB
R108 8.2K
R106 10K
INPUT (UNBAL)
8 7 3 2 4 5 1
INPUT (BAL)
J102
2
-10dBV
+4dBu
1
18
C50 JUMPER
J101
3
22
21
4 3 2
4
5 1
1
6 10
4
4
7
8
8
3
7 8 9
8
3
1 4
TABLE OF CONTENTS
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. CONTROLS, INDICATORS & CONNECTORS . . . . . . . . . . . . . . 6 3. EXPLODED VIEW, PCB ASSEMBLY & PARTS LIST . . . . . . . . 7 4. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 17
8
NOTES * 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.
* The following accessories are supplied with NF-1 as the standard accessories.
NF-1 owner's manual NF-1A owner's manual : 8288457000 (for export & domestic model) : 8288459000 (for export model) : 8288460000 (for domestic model)
* Following is the packing material for the Model NF-1.
Carton, inner, 3 pads, NF-1 Carton, outer, NF-1 Sheet, mirror : 8228739000 : 8228917000 : 8216729000
* Following is the packing material for the Model NF-1A.
Carton, inner, NF-1A Carton, outer, NF-1A Packing, side, NF-1A Packing, front, NF-1A Sheet, mirror : 8228738000 : 8228916000 : 8228466001 : 8228466002 : 8216729000
3
1
8
+15V W501 C501 0.0022 PES
R503 10K 2
C508 220p CER 9 IN1 4 R505 1K 3
+V 10 IN+
+V OUT3
TO INPUT
5
-15V
+38V
R508 20K
-38V C516 220p CER 6 R510 10K 7 5 C511 0.0022 PES U501B BA4560N R513 130 C512 100/16 9 INR512 1K C510 0.0039 PES R511 10K 1 5 +V 10 IN+ U510 LM3886TF 7 GND 8 MUTE R516 20K NC 2 NC 6 NC 11 -V 4 R517 10 C517 0.1 PES +V OUT3 1 2 3 4 J502
4
1
4
dB 100 10 20 30 40 50 60 70 80 90 10
NF-1 & NF-1A
NF-1
1. SPECIFICATIONS
20 Hz 50 100 200 500 1000
Enclosure system Drivers
· NF-1 Dimensions
Impedance Frequency Response Crossover Frequency Sound Pressure Level Input (Program) Enclosure volume Weight
240 mm
2000 5000 10000
Second Distortion Third Distortion
20000 40000
100 30 40 50 60 70 80 90 10 20 Hz 50 100 200 dB 110
274 mm 267 mm
500 1000 2000 5000
Power Amp & SW PCB
C506 47p CER R507 10K +38V +15V C503 0.01 CER
Specifications and physical appearance are subject to change without notice for product improvement. 2-way bass-reflex system 160 mm HP woofer x 1 (low-leakage type) 20 mm Soft-Dome tweeter x 1 (low-leakage type) 8 50 Hz ~ 40 kHz 10 kHz 89 dB/W (1 m) 120 W 11 liters Approx. 9.1 kg
340 mm
10000 20000 40000 16 32 4 8
30º 60º
1 2 3 4 5
C502 0.0022 PES R504 20K
U501A BA4560N -15V C504 0.01 CER
C513 47p CER R515 10K C505 1/50
R506 150
U502 LM3886TF 7 GND 8 MUTE NC 2 NC 6 NC 11 -V
R509 10 C509 0.1 PES
4. CIRCUIT & BLOCK DIAGRAMS
TO LF SPEAKER TO HF SPEAKER
-38V U001 DTC114ES 2 3 C008 100/16 -38V L1 BEAD 6H F1 FUSE 1 J001 AC IN W1 GND 1 C012 NON L2 BEAD 6H 1 100V: GRY W3 120V: BRN 230V: VIO 1 W4 WHT 100/12V: 3.15A C011 230V: 1A 0.0047 W6 1 BRN 1 2 3 J501 1 2 3 CONN-M-03 C014 NON C013 NON W5 BRN S1 SW POWER T1 TRANSFORMER POWER R004 +38V 270 1/2W RF R001 4.7K C002 4700/63 C004 1/50 D002 MTZJ15 Q001 2SD1200F +15V C006 10/16 R003 470K
D001 GBU6D
C005 1/50 C003 4700/63 R002 4.7K -38V R005 270 1/2W RF
D003 MTZJ15
C007 10/16
Q002 2SB889F
-15V
NF-1 & NF-1A
17