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

NF-1 & NF-1A NF-1 & NF-1A

1. SPECIFICATIONS

NF-1

Enclosure system 2-way bass-reflex system
Drivers 160 mm HP woofer x 1 (low-leakage type)

Impedance 8 Ω
Frequency Response 50 Hz ~ 40 kHz
Crossover Frequency 10 kHz
Sound Pressure Level 89 dB/W (1 m)
Input (Program) 120 W
Enclosure volume 11 liters
Weight Approx. 9.1 kg

<NF-1 Distortion Characteristic>

dB

100

90

80

70

60

50

40

30

20

10

10 Hz

• NF-1 Dimensions

Second Distortion
Third Distortion

20 mm Soft-Dome tweeter x 1 (low-leakage type)

<NF-1 Frequency / Impedance Characteristic>

dB

110

100

90

80

70

60

50

40

30

4000020000100005000200010005002001005020

10 Hz

340 mm

4. CIRCUIT & BLOCK DIAGRAMS

TO LF

SPEAKER

TO HF

SPEAKER

J502

123

4

R509

10

C509

0.1 PES

2

6

11

NC

NC

LM3886TF

R506

150

C513

47p CER

BA4560N

R504

C502

0.0022 PES

GND

7

C505

R515

C504

-15V

20K

NC

4

-V

MUTE
8

R508

20K

1/50

10K

0.01 CER

+38V

-38V

5

+V

1

+V

IN­9

C516

220p CER

C510

0.0039 PES

R512

OUT3

IN+
10

1K

10K

R511

10K

R510

R517

576

10

U510

LM3886TF

R513

U501B

BA4560N

C511

C517

0.1 PES

2

6
NC

NC

GND
7

130

0.0022 PES

11
NC

MUTE
8

C512

4

-V

R516

100/16

20K

OUT3

5

+V

+38V

1

C506 47p CER

R507 10K

30º
60º

Ω

32

16

8

4

4000020000100005000200010005002001005020

C503

0.01 CER

+15V

C508

R503

+V

IN+

IN­9

10

220p CER

R505

1K

1

84

2

10K

C501

0.0022 PES

U502

U501A

3

R003

-38V

470K

U001

DTC114ES

C008

100/16

3

2

-38V

1

C006

10/16

+15V

D002

BRN

1

R001

4.7K

W6

C002

C013

J501

BRN

MTZJ15

4700/63

NON

1

Q001

2SD1200F

R004

270 1/2W RF

+38V

T1

TRANSFORMER POWER

S1

SW POWER

1/50

C004

123

123

100V: GRY

C007

D003

MTZJ15

1/50

C005

C003

D001

GBU6D

NON

C014

CONN-M-03

120V: BRN

230V: VIO

W3W5W4

1

10/16

R002

4700/63

WHT

1

4.7K

-15V

Q002

2SB889F

R005

270 1/2W RF

-38V

-15V

F1

FUSE

L1

BEAD 6H

C011

0.0047

230V: 1A

100/12V: 3.15A

J001

AC IN

1

W1

C012

GND

NON

L2

BEAD 6H

240 mm

267 mm

274 mm

Specifications and physical appearance are subject to change without notice for product improvement.

+15V

12345

W501

TO INPUT

Power Amp & SW PCB

4 17

NF-1 & NF-1A NF-1 & NF-1A

320 mm

267 mm

340 mm

240 mm

• NF-1A Dimensions

Ref. No. Part No. Description
R121 8230 1384 73 HT, Carbon, 1/4W, 47kΩ, 5%
R122, 123 8230 1383 02 HT, Carbon, 1/4W, 3kΩ, 5%
R124 8230 1381 62 HT, Carbon, 1/4W, 1.6kΩ, 5%
R125 8230 1381 02 HT, Carbon, 1/4W, 1kΩ, 5%
R126 8230 1384 72 HT, Carbon, 1/4W, 4.7kΩ, 5%
R127 8230 1384 71 HT, Carbon, 1/4W, 470Ω, 5%
R128 8230 1384 73 HT, Carbon, 1/4W, 47kΩ, 5%
R129 8230 1384 72 HT, Carbon, 1/4W, 4.7kΩ, 5%
R131, 132 8230 1381 03 HT, Carbon, 1/4W, 10kΩ, 5%
R133 8230 1386 82 HT, Carbon, 1/4W, 6.8kΩ, 5%
R134 8230 1381 83 HT, Carbon, 1/4W, 18kΩ, 5%
R135 8230 1384 72 HT, Carbon, 1/4W, 4.7kΩ, 5%
R136, 137 8230 1382 03 HT, Carbon, 1/4W, 20kΩ, 5%
R139 8230 1384 73 HT, Carbon, 1/4W, 47kΩ, 5%
R140 8240 2930 06 Pot., PI, RT9, 10kΩA, EVUE2A
R141 8240 2930 07 Pot., PI, RT9, 10kΩB, EVUE3A

Ref. No. Part No. Description
C050, 051 N/A
C101, 102 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB
C103, 104 8232 8014 70 VT, CER, 50V, 47pF, 5%, SL
C105, 106 8232 1461 05 VT, ALU, 50V, 1µF, 20 %, SME-VB
C107 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB
C111 8232 9012 73 VT, PES, 50V, 0.027µF, 5%, AMZF
C112~114 8232 1461 05 VT, ALU, 50V, 1µF, 20 %, SME-VB
C115 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB
C116 N/A
C117 8232 9012 73 VT, PES, 50V, 0.027µF, 5%, AMZF
C118 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB
C119 N/A
C120, 121 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB
C122~124 8232 9011 53 VT, PES, 50V, 0.0015µF, 5%, AMZ
C125 N/A
C126 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB
C131 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB
C132, 133 8232 1461 05 VT, ALU, 50V, 1µF, 20 %, SME-VB
C134 8232 9012 22 VT, PES, 50V, 0.0022µF, 5%, AMZF
C135 N/A
C136 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB

Ref. No. Part No. Description
E001 Wire, jumper, F5
E002 Wire, jumper, F10
J101 8245 3390 09 Connector, PI, jack, phone,

J102 8245 2680 03 Connector, PI, jack, XLR, NC3FAH2-0
J103 8245 0530 02 Connector, PI, jack, 8283, 2P, WHT
J104 8245 3080 05 Connector, PI, jack, 5P, SBRK 5S-4
L101, 102 8242 1860 13 Filter, T, EMI, LEF7B-M3R2T

CAPACITORs

ALU = Electrolytic type

CER = Ceramic type

PES = Mylar type

MISCELLANEOUS

YKB21-5006

Ref. No. Part No. Description
S110 8253 6550 19 SW, PL, slide, 4-3, non-shortening,

SSSFI, L06

S120 8253 6550 20 SW, PL, slide, 2-2, non-shortening,

SSSFI, L06

S130 8253 6550 19 SW, PL, slide, 4-3, non-shortening,

SSSFI, L06

• SW PCB assy

Ref. No. Part No. Description

8274 2720 00 PCB Assy, SW, NF-1A
8251 9930 03 Plain PCB, SW, NF-1A

Ref. No. Part No. Description
C011 8256 0750 05 Spark killer, 0.0047µF
C012 N/A
E001 8239 0002 00 Holder, PI, fuse, S-N5057
J001 8245 3210 00 Connector, PL, jack, AC-INLET, 3P,

0714-FR7
L001, 002 8242 1340 01 Filter, EMI, 6 hole
S001 8253 4710 03 SW, PI, rocker, power, EST15
W001 8277 1630 15 Cable assy, earth lug, SIN1.8, L150
W003, 004 8245 5430 00 Terminal, IPS-5007
W005, 006 8277 1610 10 Cable assy, SIN1.8 - wire, L100

• LED assy

Ref. No. Part No. Description
D001 8234 1044 00 Opt., LED, GRN, SLR-342MG3F
W001 8276 3340 20 Cable assy, 2P,

WHT8263/F-8263/F, L200
Y101 8207 0051 08 Spacer, LED, 11, LH-5-11

Abbreviation

DIP: Dual In Line
H: Horizontal mount
ZIP: Zigzag in-line package
SIP: Single in-line package
V: Vertical mount
T: Taping device
P: Penetrate mount
I: I form (straight)
L: L form (right angle)
DG: Digital
AN: Analogue

NF-1A

Speakers

Enclosure system 2-way bass-reflex system
Drivers 160 mm HP woofer x 1 (low-leakage type)

20 mm Soft-Dome tweeter x 1 (low-leakage type)

Impedance 8 Ω
Reproduction Frequency Response 50 Hz ~ 40 kHz
Enclosure volume 9.2 liters
Maximum output sound level 106 dB (with VOL max./rated input)

Amplifiers

Output power 60 W each for low and high frequency amplifiers
Tweeter SPL adjustable level ± 3 dB
Filter characteristic adjustable level

HI-FREQ (10 kHz) + 3 / 0 / - 3 dB (selective)
LO-FREQ (60 Hz) + 3 / 0 / - 3 dB (selective)
HI-MID ATT. (3 kHz) 0 dB when switched off.

- 3 dB when switched on.

Input terminals XLR-3-31 type (for balanced input)

∅6 mm phone jack (for unbalanced input)

Normal input level +4 dBu (XLR balanced input)

-10 dBV (phone unbalanced input)

Input impedance 20 kΩ or more
Crossover frequency 5 kHz

Others

Weight Approx. 11 kg
Power supply 120 V AC, 60 Hz

230 V AC, 50 Hz

Power consumption 52 W

Specifications and physical appearance are subject to change without notice for product improvement.

16 5

NF-1 & NF-1A NF-1 & NF-1A

2. CONTROLS, INDICATORS & CONNECTORS

NF-1A

1. Power LED

2. Heat sink

3. Loudness control [

VOL, -∞ ~ MAX (0dB)

4. Tweeter level control
[

TWEETER LEVEL, -3 ~ 0dB ~ +3

5. Hi-Mid attenuator [

HI-MID ATT., ON / OFF

6. High-frequency filter selector
[

HI-FREQ, +3dB / 0 / -3

]

+3dB

0dB

-3dB

60Hz

]

]

]

+3dB

0dB

-3dB

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

RISQUE ELECTRIQUECHOCDE

AVIS:

NE PAS OUVRIR.

WARNING:

TO

REDUCETHE RISKOF FIREORELECTRIC
SHOCK,DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE.

0dB

-3dB

HI-MID ATT.HI FREQLO FREQ

7. Low-frequency filter selector
[

LO-FREQ, +3dB / 0 / -3

8. Unbalanced input terminal
[

INPUT, UNBAL -10dBV (phone jack)

9. Balanced input terminal
[

INPUT, BAL +4dBu (XLR)

10. Power switch [

11. AC IN connector [

MAX

(0dB)

-3

+3

1:G
2:H
3:C

3k1k 5kHz10kHz

ON
OFF

+3dB
0

-3

+3dB
0

-3

TWEETER

0dB

HI-MID ATT.

LO FREQ

POWER

POWER

VOL

LEVEL

HI FREQ

INPUT

UNBAL

-10dBV

BAL

+4dBu

ON

OFF

AC IN

AC IN

NF-1A PCB Assy Parts List

• POWER AMP PCB assy

Ref. No. Part No. Description

]

]

]

]

]

Ref. No. Part No. Description
U001 8236 0781 01 PT, DG, driver, DTC114ES
U501 8236 0361 00 PT, SIP, AN, op amp, BA4560N
U502 8236 0466 00 HZIP, AN, power amp, LM3886TF
U510 8236 0466 00 HZIP, AN, power amp, LM3886TF

8274 2700 00 PCB Assy, Power Amp, NF-1A
8251 9930 01 Plain PCB, Power Amp, NF-1A

ICs

Ref. No. Part No. Description
C503, 504 8232 8031 03 VT, CER, 50V, 0.01µF, 5%, YF
C505 8232 1461 05 VT, ALU, 50V, 1µF, 20 %, SME-VB
C506 8232 8014 70 VT, CER, 50V, 47pF, 5%, SL
C507 N/A
C508 8232 8012 21 VT, CER, 50V, 220pF, 5%, SL
C509 8232 9011 04 VT, PES, 50V, 0.1µF, 5%, AMZ
C510 8232 9013 92 VT, PES, 50V, 0.0039µF, 5%, AMZF
C511 8232 9012 22 VT, PES, 50V, 0.0022µF, 5%, AMZF
C512 8232 1431 07 VT, ALU, 16V, 100µF, 20 %, SME-VB
C513 8232 8014 70 VT, CER, 50V, 47pF, 5%, SL
C514, 515 N/A
C516 8232 8012 21 VT, CER, 50V, 220pF, 5%, SL
C517 8232 9011 04 VT, PES, 50V, 0.1µF, 5%, AMZ

TRANSISTORs

Ref. No. Part No. Description
Q001 8234 1099 00 V, NPN, 2SD1200F
Q002 8234 1100 00 V, PNP, 2SB889F

1

DIODEs

Ref. No. Part No. Description
D001 8234 1977 01 V, stack, GBU6D
D002, 003 8234 5039 59 HT, zener, 15V, MTZJ15

Ref. No. Part No. Description
E001 Wire, jumper, F5
E002 Wire, jumper, F10
E003 8207 0122 05 Holder, cable, 5P, 51048 (W501)
J501 8245 3050 03 Connector, PI, jack, VH, 3P, WHT
J502 8245 3050 04 Connector, PI, jack, VH, 4P, WHT
Y401 8221 3301 00 Bracket, pcb, power amp, NF-1A

MISCELLANEOUS

W005~007 8245 5430 00 Terminal, IPS-5007

2

3

Ref. No. Part No. Description
R001, 002 8230 1384 72 HT, Carbon, 1/4W, 4.7kΩ, 5%

RESISTORs

W501 8276 9185 15 Cable, flat, 5P, S-KINK, L150
W502 N/A

R003 8230 1384 74 HT, Carbon, 1/4W, 470kΩ, 5%

4

R004, 005 8230 1292 71 H, fuse, 1/2W, 270Ω, 5%
R501, 502 N/A

5

6

R503 8230 1381 03 HT, Carbon, 1/4W, 10kΩ, 5%
R504 8230 1382 03 HT, Carbon, 1/4W, 20kΩ, 5%
R505 8230 1381 02 HT, Carbon, 1/4W, 1kΩ, 5%
R506 8230 1381 51 HT, Carbon, 1/4W, 150Ω, 5%
R507 8230 1381 03 HT, Carbon, 1/4W, 10kΩ, 5%

• INPUT PCB assy

Ref. No. Part No. Description

8274 2710 00 PCB Assy, Input, NF-1A
8251 9930 02 Plain PCB, Input, NF-1A

R508 8230 1382 03 HT, Carbon, 1/4W, 20kΩ, 5%

7
8

R509 8230 1381 00 HT, Carbon, 1/4W, 10Ω, 5%
R510, 511 8230 1381 03 HT, Carbon, 1/4W, 10kΩ, 5%
R512 8230 1381 02 HT, Carbon, 1/4W, 1kΩ, 5%

Ref. No. Part No. Description
U101~103 8236 0361 00 SIP, AN, op amp, BA4560N

ICs

R513 8230 1381 31 HT, Carbon, 1/4W, 130Ω, 5%

9

R514 8230 1384 72 HT, Carbon, 1/4W, 4.7kΩ, 5%
R515 8230 1381 03 HT, Carbon, 1/4W, 10kΩ, 5%
R516 8230 1382 03 HT, Carbon, 1/4W, 20kΩ, 5%
R517 8230 1381 00 HT, Carbon, 1/4W, 10Ω, 5%

Ref. No. Part No. Description
R101, 102 8230 1382 03 HT, Carbon, 1/4W, 20kΩ, 5%
R103, 104 8230 1382 03 HT, Carbon, 1/4W, 20kΩ, 5%

RESISTORs

R105 8230 1384 73 HT, Carbon, 1/4W, 47kΩ, 5%
R106, 107 8230 1381 03 HT, Carbon, 1/4W, 10kΩ, 5%
R108 8230 1388 22 HT, Carbon, 1/4W, 8.2kΩ, 5%
R110 8230 1383 93 HT, Carbon, 1/4W, 39kΩ, 5%
R111 8230 1388 23 HT, Carbon, 1/4W, 82kΩ, 5%
R112 8230 1384 34 HT, Carbon, 1/4W, 430kΩ, 5%
R113 8230 1381 05 HT, Carbon, 1/4W, 1MΩ, 5%
R114 8230 1384 33 HT, Carbon, 1/4W, 43kΩ, 5%
R115, 116 8230 1384 73 HT, Carbon, 1/4W, 47kΩ, 5%
R117 8230 1382 02 HT, Carbon, 1/4W, 2kΩ, 5%
R118 8230 1383 02 HT, Carbon, 1/4W, 3kΩ, 5%
R119 8230 1381 62 HT, Carbon, 1/4W, 1.6kΩ, 5%
R120 8230 1384 72 HT, Carbon, 1/4W, 4.7kΩ, 5%

10

11

CAPACITORs

ALU = Electrolytic type

CER = Ceramic type

PES = Mylar type
Ref. No. Part No. Description
C002, 003 8232 2054 78 VT, ALU, 63V, 4700µF, 20%,

SMH-VNSN
C004, 005 8232 1461 05 VT, ALU, 50V, 1µF, 20 %, SME-VB
C006, 007 8232 1431 06 VT, ALU, 16V, 10µF, 20 %, SME-VB
C008 8232 1431 07 VT, ALU, 16V, 100µF, 20 %, SME-VB
C013, 014 N/A
C501, 502 8232 9012 22 VT, PES, 50V, 0.0022µF, 5%, AMZF

6 15

NF-1 & NF-1A NF-1 & NF-1A

• Parts side of SW PCB assy

W1

GND

W4

PT (WHT)

EUR/UK
JPN/USA/CND

L2

N

C012

L1

F1

T1A 250V

3.15A 125V

3. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST

9

7

J001

L

C011

SW

W5

SW

8251993 003

W6

W3

PT

7

8

8

13

14

11

12

5

RED (+): To Tweeter

BLK (-): To Tweeter

BLK (-): To Woofer

10

RED (+): To Woofer

• Foil side of SW PCB assy

W6

J001

C011

SW

W3 PT

LN

C012

W5

L1

F1

L2

W3 PT (WHT)

12 8276 9200 03 Cord, blk, L = 300

13 8277 5020 00 Cable assy, L = 300 (+ C 1.0µF)

Ref. No. Part No. Description

14 0532 1031 06 CM1.0, film capacitor

15 8220 8490 00 Emblem, FOSTEX

(included in the enclosure assy)

4

(included in the enclosure assy)

in the enclosure assy)

15

3

1

2

6

7

1 B805 5830 00 Woofer, NF-1/NF-1A

2 B805 5829 00 Tweeter, NF-1/NF-1A

3 8216 7300 00 Packing

4 8260 5760 00 Enclosure assy, NF-1

5 8216 7280 00 Damping material, 490 x 190 x 10

6 8214 3940 00 Bolt, M3, torx button, L20, T

7 8214 3930 00 Bolt, M4, torx button, L20, T

8 8216 7240 00 HP reflector, NF-1 (not included

9 8245 3580 00 Terminal, CL-S48-1

10 8276 9200 00 Cord, red, L = 350

NF-1 OVERALL EXPLODED VIEW & PARTS LIST

Ref. No. Part No. Description

11 8276 9200 01 Cord, blk, L = 350

14 7

NF-1 & NF-1A NF-1 & NF-1A

BTP3 x 16BZn

15

14

13

11

12

10

• Foil side of Input PCB assy

J102

R114
R113

C111

R105

C050

R107
R108
R106

L101

J101

C101

L102

C102

R103
C103
R102
R101

R112

C117
R110
R111

C120
R115

U101

C107
C104

R104

C51

C106

C105

S

G

C

H

in the enclosure assy)

8 8216 7240 00 HP reflector, NF-1 (not included

Ref. No. Part No. Description

8

WHT8263/F-8263/M, L450

9 8270 8830 00 LED assy, NF-1A

10 8277 5041 45 Cable assy, 2P,

11 8277 5010 00 Cable assy, SP, NF-1A

12 8216 7340 02 Sheet, connector, NF-1A

13 8221 3290 00 Bracket, connector, NF-1A

14 8207 0002 25 Bushing, SR-6N3-4

15 8216 7350 00 Sheet, chassis, NF-1A

16 8218 7950 00 Plate, name, NF-1A

1

32

8745

5

4

(included in the enclosure assy)

(included in the enclosure assy)

8

9

S120 S130 S110

R
E

W
O
P

16

3

2

1

R140 R141

C131

R135
R134

R133
C134
R136
R132
R127
R125

C126
R128

C118
R118

R119

C114

R116

C115

C121
R139

U103 U102

C136
C135

R137
R131

C113
R123

R125
R122
R121
C122
C123
R124
C124

R126

C112

C119
R117

C133

C132

INPUT. NF-1A

12

R129
R120

5

1

J103

J104

6

1 B805 5830 00 Woofer, NF-1

2 B805 5829 00 Tweeter, NF-1

3 8216 7300 00 Packing

4 8260 5770 00 Enclosure assy, NF-1A

5 8216 7280 00 Damping material, 490 x 190 x 10

6 8214 3940 00 Bolt, M3, torx button, L20, T

7 8214 3930 00 Bolt, M4, torx button, L20, T

Ref. No. Part No. Description

NF-1A OVERALL EXPLODED VIEW (Speaker & Enclosure Section)

7

8 13

NF-1 & NF-1A NF-1 & NF-1A

• Parts side of Input PCB assy

VOL

R140

TW LEV

R141

S120

HI-MID ATT

C121C115

R128

R125
R127

R132
R136
C134
R133

R134
R135

R139

R116

C114C118

R119
R118

C126

U102 U103

C112

R131

C132

C133

R117
C119

R126
C124

R124
C123
C122
R121
R122
R125
R123

C113

R137
C135

1

R120
R129

21

8251993 002

J104

J103

INPUT

N4

LW4

From

Transformer

GND cable

BBT3 x 8

BZn

29

26

N4

25

BBT3 x 8

BZn

LWE4

27

32

19

30

24

28

BTT4 x 10

BZn

23

22

BTT4 x 10

BZn

B3 x 4BZn

BTT4 x 10

BZn

LWE3

18

B3 x 8BZn

BTT4 x 10

BZn

BBT3 x 8

BZn

31

S130S110

HI CARCTLO CARCT

J101

J102

R105

C111

R113
R114

C131

R115

R111
R110
C117

R112

R101

R102
R103

L101
R106

R108
R107

C120

U101

C103

C102

C101

C136

L102

C105

C106

C51

R104
C104

C107

BTP3.5 x 8BZn

LW3.5

W3.5

BBT3 x 8BZn

21

BBT3 x 8BZn

USA/CND, NF-1A

BTP3.5 x 8BZn

EUR/UK, NF-1A

JPN, NF-1A

BBT3 x 8

BZn

SDDLA1

17

BBT3 x 8

BZn

BBT3 x 6BZn

33

USA/CND/JPN

EUR/UK

20

BBT3 x 8BZn

VM0033-0089, USA/CND

0309B-0310B, EUR

KP610-KS31A, UK

VM1292-1298, JPN

C050

8242 2690 00 Transformer, power, 230V,

8242 2700 00 Transformer, power, 100V,

17 8221 3311 00 Chassis, amp, NF-1A

18 8221 2610 00 Bracket, AC-IN, FD-8/NF-1A

19 8216 7370 00 Cover, SW, NF-1A

20 8207 0133 10 Heat sink, NF-1A

21 8274 2700 00 PCB assy, Power Amp, NF-1A

22 8274 2710 00 PCB assy, Input, NF-1A

23 8274 2720 00 PCB assy, SW, NF-1A

24 8204 0580 04 Spacer, 6, M3 x 6

Ref. No. Part No. Description

NF-1A OVERALL EXPLODED VIEW (Amplifier Section)

25 8242 2680 00 Transformer, power, 120V,

26 8253 4230 00 SW, WI, rocker, power,

27 8216 7340 01 Sheet, transformer, NF-1A

28 8245 3400 00 Nut, phone jack

29 8221 3360 00 Bracket, PCB, input, NF-1A

8239 0007 10 Fuse, 20, TDLY, 1A, 250V,

30 8239 1003 19 Fuse, 20, TLAG, 3.15A, 125V,

8276 8021 00 Cord, power, CEE,

31 8276 8010 00 Code, power, UL/CSA,

8276 9170 00 Cord, power, BS, 3C,

8276 8000 00 Cord, power, DM,

32 8216 7340 03 Sheet, transformer, B

33 8207 0117 04 Holder, cord, CS-1

12 9

NF-1 & NF-1A NF-1 & NF-1A

NF-1A PCB Pattern Drawing

• Parts side of Power Amp PCB assy

C505

C509

11

C508

U502

R516

R512
C516

R509

1

R508

U001

13

11

C506

R003

C512 C008

R513

R506

R507

R505

C502
C504

C511
R511

R510

Q002

R503

C510

E

B

C005

1

U501

TO INPUT

W501

C007

R002

D003

15

R001

E

B

D002

C504

C503

Q001

• Foil side of Power Amp PCB assy

C013

C517

1

R517

D001

1

AC

14

J501

3

AC

1

C014

C002 C003

R005

R004

U510

1

C513

R517

C013

R515

LF (HOT)

14

C517

C003

HF (HOT)

J501

P. TRANS

C004 C006

8251993 001

J502 SPEAKER

R005

R004

POWER AMP

C002

31

C014

1

R516

U502 U510

11

R516
R512

13

1

11

C513

U001

R508

R509

C509

R515

R513

C512

C008

R003

C506

C508

R507

R506

C505

R505

J502

Q002

C510
R510
R511
C511

U501

R504
C502
R503

C501

C005
D003

R002

1

R001

5

1

C004
D002

Q001

C006

C503

C007
C504

W501

D001

10 11