Fostex NF-1, NF-1-A Service manual
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 NF-1 & NF-1A
CAUTION:
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
TO PREVENT ELECTRIC SHOCK, MATCH
WIDE BLADE OF PLUG TO WIDE SLOT,
FULLY INSERT.
HF POWER TWEETER
WOOFERLF POWER
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.
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.”
SAFETY INSTRUCTIONS
Read instructions - All the safety and operating instruc-
1.
tions should be read before the appliance is operated.
Retain instructions - The safety and operating instructions
2.
should be retained for future reference.
Heed warnings - All warnings on the appliance and in the
3.
operating instructions should be adhered to.
Follow instructions - All operating and use instructions
4.
should be followed.
Water and Moisture - The appliance should not be used
5.
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
6.
with a cart or stand that is recommended by the manufacturer.
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
7.
mounted to a wall or ceiling only as recommended by the
manufacturer.
Ventilation - The appliance should be situated so that its
8.
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.
ATTENTION:
POUR ÉVITER LES CHOCS ÉLECTRIQUES,
INTRODUIRE LA LAME LA PLUS LARGE DE
LA FICHE DANS LA BORNE CORRESPONDANTE DE LA PRISE ET POUSSER
JUSQU' AU FOND.
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.
Heat - The appliance should be situated away from heat
9.
sources such as radiators, heat registers, stoves, or other
appliances (including amplifiers) that produce heat.
Power Sources - The appliance should be connected to a
10.
power supply only of the type described in the operating
instructions or as marked on the appliance.
Grounding or Polarization - The precautions that should
11.
be taken so that the grounding or polarization means of
an appliance is not defeated.
Power Cord Protection - Power supply cords should be
12.
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 rec-
13.
ommended by the manufacturer.
Nonuse Periods - The power cord of the appliance should
14.
be unplugged from the outlet when left unused for a long
period of time.
Object and Liquid Entry - Care should be taken so that
15.
objects do not fall and liquids are not spilled into the enclosure through openings.
Damage requiring Service - The appliance should be ser-
16.
viced by qualified service personnel when:
The power supply cord or the plug has been damaged;
A.
or
Objects have fallen, or liquid has been spilled into the
B.
appliance; or
The appliance has been exposed to rain; or
C.
The appliance does not appear to operate normally or
D.
exhibits a marked changed in performance; or
The appliance has been dropped, or the enclosure
E.
damaged.
Servicing - The user should not attempt to service the ap-
17.
pliance beyond that described in the operating instructions. All other servicing should be referred to qualified
service personnel.
NF-1A Block Diagram
LEVEL
TWEETER
OFF
0dB
+3dB
0dB
+3dB
VOL
ON
HI-MID ATT.
-3dB3kHz
10kHz
HIGH FREQ.
-3dB
60Hz
LO FREQ.
-3dB
-10dBV
INPUT (UNBAL)
+4dBu
1: GND
2: HOT
INPUT (BAL)
3: COLD
19
NF-1 & NF-1A NF-1 & NF-1A
C119
NON
R117
+15V
U103B
4
R128
1.6K
BA4560N
47K
NON
C125
47K
R121
R135
47K
R139
C124
0.015 PES
4.7K
J103
1
2
TO POWER LED
4.7K
R120
4.7K
R129
4.7K
R126
18K
R134
R133
6.8K
-15V
TABLE OF CONTENTS
1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. CONTROLS, INDICATORS & CONNECTORS . . . . . . . . . . . . . .
3. EXPLODED VIEW, PCB ASSEMBLY & PARTS LIST . . . . . . . .
4. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . .
4
6
7
17
J104
12345
LEV.
TWEETER
3
215
4
R141
BA4560N
1
3
2
C115
10/16
OFF
C133
ON
10KB
1/50
-15V
U103A
2K
1/50
C132
84
+15V
R118
R119
3K
47K
R116
HI-MID ATT.
1618
20
S130D
+3dB
0dB
-3dB
17
19
1.6K
C118
C114
S120A
10/16
1/50
VOL.
1
2
C126
R127
R140
3
10/16
470
R123
R122
TO POWER AMP
576
C121
10/16
215
10KA
3
7
8
1K
R125
R124
U102B
BA4560N
576
C123
0.015 PES
3K
3K
C122
0.015 PES
Input PCB
HI-FREQ.
+3dB
0dB
-3dB
LO FREQ.
C136
C135
10/16
NON
R137
S110D
C104
47p CER
20K
+15V
1618
20
17
19
R104
1
8
3
2
1/50
C112
10K
R131
C131
10/16
S110B
82K
R111
9
7
39K
R110
20K
1/50
C105
+15V
U101A
BA4560N
20K
R102
C102
10/16
L102
BEAD
8732451
-10dBV
INPUT (UNBAL)
U102A
4
U101B
8
2
J101
BA4560N
10K
R132
BA4560N
C107
1
C106
3
6 8
4
10
10/16
1/50
C51
R101
C101
576
L101
C120
NON
20K
10/16
BEAD
2
-15V
S130A
1/50
C113
R115
10/16
13
5
C117
21
0.027 PES
S110A
C111
0.027 PES
R105
-15V
8.2K
R108
+4dBu
INPUT (BAL)
47K
47K
1 3
J102
4
5
22
R107
R106
4
C50
C134
10K
10K
2
JUMPER
22
21
0.0022
2
4
1
PES
430K
R112
C103
47p CER
R103
20K
R136
R114
R113
3
20K
43K
1M
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 : 8288457000 (for export & domestic model)
NF-1A owner’s manual : 8288459000 (for export model)
: 8288460000 (for domestic model)
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
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
18 3
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