TOC

G-7

ELECTRICAL DIAGRAMS

VOLTAGE PC BOARD SCHEMATIC

 

G-7

Section

Master

A B C D E F GH J K L M

C

Return to

TOC

1

C1102

C1101

2

N.A. 667

+

ARC

VOLTAGE POLARITY TERMINALS

-

621

L501

TP 501

F501

L502

 

R501

 

CW

C519

R502

 

C501

 

R503

510P

B3C

R504

 

 

 

525

 

 

 

A5H

 

 

 

C520

 

13 -

 

4

 

A

14

 

12 +

 

 

 

11

 

 

 

 

 

 

C521

 

D502

 

 

 

 

 

500

 

 

 

A6H

9

-

X501

B

8

R547

 

+ C524

 

 

 

 

 

WELD

PIN F

 

 

 

 

 

 

 

RESPONSE

 

 

500

 

 

 

 

 

JUMPER

 

 

R510

A6H

 

 

 

 

R506

(RED)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIN S

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R535

 

R507

2

-

ACTUAL VOLTAGE

 

 

 

 

 

 

 

 

A

BUFFER

R539

 

 

 

C506

 

 

1

 

R532

 

 

3

+ X502

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTROL

 

525

 

 

 

 

 

 

 

 

AMP

 

 

D516

 

 

 

 

 

 

 

A5H

 

6

-

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

D

 

 

 

 

 

 

DZ

 

 

5 +

X501

D505

 

Q506

R537

 

 

 

 

 

 

 

 

 

503

 

R505

 

 

 

 

 

 

D503

 

+

D504

 

 

 

525

 

 

 

 

 

 

 

 

 

 

C507

R509

+

C508

C518

+

D506

R518

10 +

B

8

 

 

 

-

X502

 

9

 

 

START

R514

 

 

 

 

CW

 

 

R515

Q501

D517

GAIN

 

 

 

 

R533

A

 

 

 

 

 

525

 

 

R534

B

 

 

 

 

1

A5H

OCI501

5

 

 

 

D519

 

 

 

 

 

 

 

 

 

 

531B

 

T501

 

 

 

 

 

C509

 

A5D

115

 

24

2

6

R513

4

 

 

 

 

 

 

DZ

 

532 VAC

 

VAC

 

 

 

 

A5D

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

504

C

 

 

 

 

 

R538

 

 

 

 

 

 

 

 

 

POWER SOURCE

 

 

 

D521

 

 

 

 

 

 

 

CW

 

CONTROL INTERFACE

 

 

 

 

R540

 

 

 

 

 

 

 

 

 

 

510

R542

 

 

R543

 

 

 

 

 

C525

 

 

 

 

 

 

 

 

R512

 

 

 

 

 

 

1

 

 

 

 

 

 

D513

 

2

0CI502

 

 

 

 

 

 

525

A5H

 

R541

R544

R526

 

 

 

 

 

 

D520

 

12

 

R527

 

R528

 

 

 

 

+

D515

 

 

 

 

 

 

DZ

 

 

 

 

 

D

14

 

 

 

DZ

 

13

 

507

 

 

 

-

 

 

506

 

 

X502

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

R545

 

 

 

 

 

 

 

C526

 

 

Q508

 

D522

 

 

 

R536

 

 

 

 

 

 

 

 

 

 

 

510P

 

 

 

 

 

 

 

 

 

 

 

 

 

R548

 

B3C

 

 

Q507

 

 

 

 

 

 

6

4

 

 

 

 

R529

 

 

 

C527

 

 

 

 

 

 

 

 

5

 

AUTO-STOP

 

 

637

D5A

 

 

6682-3

 

 

 

 

SHT. NO. L

 

NA-5 SCHEMATIC

VOLTAGE CIRCUIT

10-5-81

 

 

 

 

SUP'S'D'G

 

 

REF.

 

 

EQUIP. TYPE

SUBJECT

 

 

 

 

3

10 +

C523

C504

510P

B3C

ACTUAL VOLTAGE

METER FILTER

D501

C505

A5H

 

R508

 

 

 

 

 

R516

HOLD - LOW CIRCUIT

C517

+

 

 

D512

R517

R511 R519

C512 + D514 +

592

D514

D7A

 

525

 

A5H

 

510P

CIRCUIT

500

D9C

B3C

 

 

 

AUTO-STOP AND

 

COM

 

 

SHUTDOWN BYPASS

AUTO

TAB JUMPER (BLUE)

 

BYPASS

Return

Return

4

5

FROM

 

 

 

 

 

 

OPTION

 

 

2

-

X501

 

AND

 

VOLTAGE

 

1

 

635

 

C

R546

PROCEDURE

SETTING

 

 

 

 

+

 

 

P.C. BOARD

 

+

3

 

 

E2E

 

 

 

 

 

 

 

 

C510

 

C516

 

 

 

 

510P

 

 

 

 

 

 

B3C

 

 

SET VOLTAGE

BUFFER

514

SET

S7B

517

516

 

500

 

 

A6H

 

 

688A

ACTUAL

688

N.C.

 

 

S7B

D4J

 

VOLTS

ARC CONTROL

 

SET-ACTUAL

 

ENABLE

4 2 3 1

 

R601

 

 

D508

525

A5H

PIN

PIN

PIN

A

B

D

START

RESPONSE JUMPER

(WHITE)

 

 

 

 

C511

 

R520

R522

R524

 

D510

 

D507

5

4

 

 

 

 

 

+

7

 

 

 

 

C

 

 

R525

-

X502

D511

R521

R523

6

 

11

 

 

 

 

D509

C522

 

 

 

 

688

500

 

 

SBS

 

 

501

R530

 

DZ502

 

 

R549

+

R531

 

 

C513

SHUTDOWN 687

D4B

D518

Q503

C528

to Master TOC

C604

6

 

CW

 

 

TP5

 

 

 

VOLTAGE P.C. BOARD RECEPTACLE FOR

R602

CAL

 

 

 

 

 

 

 

 

 

 

OPTIONAL PULSED POWER FILTER P. C.

 

1

 

+5V

 

 

 

 

TP4

2

 

 

X601

 

 

BOARD (SHOWN WITH JUMPER PLUG

 

 

 

 

 

INSTALLED.)

 

 

 

 

 

 

 

4

DM601

 

OUT

IN

 

D602

 

 

 

 

 

 

 

GND

 

 

R603

 

 

 

 

 

 

C603

E C A

+

 

 

D601

601

A6E

 

 

518

C602

 

+

602

A6E

 

 

 

 

C601

 

 

 

 

 

 

 

 

D603

D604

 

 

 

 

 

 

 

 

510P

VOLTMETER

510

VOLTMETER

B3C

 

B7G

POWER SUPPLY

 

 

D4J

A6H

SHUTDOWN

ENABLE

SHUTDOW CIRCUIT

500

A6H

Return

Return to Section TOC

7

 

 

 

VOLTAGE P.C. BOARD

 

 

 

 

 

 

VOLTMETER P.C. BOARD

COMPONENTS NOT ON P.C. BOARD

 

KEY TO SYMBOLS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C501

.1/100

D501

 

R501

44.2K, 1/4W, 1%

R526

47K

F501

1 /8 AMP FAST

C601

500/50

DM601

DIGITAL METER

INPUT CONTROL CABLE CONNECTION

 

C504

4.0/50

THRU

1A, 400V

R502

500 TRIMMER

R527

47K

 

BLOW FUSE

C602

4.7/35

 

 

 

 

 

 

 

 

 

C505

.47/50

D522

6.8V, 1 /2W

R503

4.75K, 1/4W, 1%

R528

22K

SBS501

SILICON BILATERAL

C603

.022/25

S7B

SPDT, VOLTS SET-ACTUAL

COMMON CONNECTION TO ANALOG POWER

 

C506

.022/25

DZ502

R504

100K

R529

22K

 

SWITCH

C604

.022/25

 

 

SUPPLY 510

A5H

 

C507

.022/25

DZ503

5.1V, 1/2W

R505

27K

R530

27K

T501

24 VAC, 185 mf

D601

 

 

 

 

 

 

 

 

 

 

C508

39/20

DZ504

20V, 1W

R506

15K

R531

100K

 

SECONDARY

D602

1A, 400V

 

 

SCHEMATIC LOCATION REFERENCE

 

C509

.022/25

DZ505

6.2V, 1/2W

R507

10K

R532

27K

TP501

150V, 10J

D603

NOTES:

 

 

 

 

 

C510

1.8/20

DZ506

15V, 1W

R508

2.2K

R533

10K

 

 

D604

 

HORIZONTAL CO-ORDINATE LETTER

 

C511

.022/25

DZ507

6.8V, 1/2W

R509

2.7K

R534

100

 

 

 

 

N.A. THESE CAPACITORS ARE LOCATED

VERTICAL CO-ORDINATE NUMBER

 

C512

4.7/35

L501

33uH, 110mA

R510

4.7K

R535

1K

 

 

 

 

 

 

 

 

 

 

ON THE R.F. BYPASS BOARD.

SCHEMATIC IDENTIFICATION LETTER

 

C513

27/35

L502

33uH, 110mA

R511

100K

R536

10K

 

 

R601

24.3K, 1/4W, 1%

 

 

 

 

 

(SEE SCHEMATIC A).

 

C514

4.7/35

OCI501

OPTO-ISOLATOR

R512

1K

R537

33K

 

 

R602

2K TRIMMER

 

 

 

 

C516

.022/25

OCI502

R513

2.7K

R538

56K

 

 

R603

2.80K, 1/4W, 1%

N.B. SEE L6682-3A SCHEMATIC FOR

 

 

 

2N4123

 

 

 

 

 

C517

.47/50

Q501

R514

2K TRIMMER

R539

27K

 

 

 

 

 

SUPERSEDED G1556-1 VOLAGE

UNLESS OTHERWISE SPECIFIED, COMPONENT VALUES OF:

 

C518

39/20

Q503

2N5816

R515

5.6K

R540

5K TRIMMER

 

 

X601

+5V VOLTAGE REGULATOR

 

 

 

 

 

BOARD.

CAPACITORS = MFD/VOLTS

 

C519

.0047-.005/1400

Q505

2N4123

R516

100K

R541

1K, 12W

 

 

 

 

 

 

 

 

 

 

 

RESISTORS = OHMS, 1 2 /WATT

L

C520

.022/25

Q506

2N4857

R517

1K

R542

470

 

 

FOR VOLTMETER P.C. BOARDS

N.C. EARLIER VOLTAGE BOARDS DO

C521

.022/25

Q507

2N5816

R518

100K

R543

68K

 

 

SINCE COMPONENTS OR CIRCUITRY ON A PRINTED

 

 

 

 

6682-

C522

.022/25

Q508

2N5816

R519

39K

R544

15K

 

 

L6685-1 OR HIGHER USE S21143

 

NOT HAVE THIS RECEPTACLE, AND

CIRCUIT BOARD MAY CHANGE WITHOUT AFFECTING THE

C523

.022/25

X501

QUAD OP-AMP

R520

15K

R545

15K

 

 

SCHEMATIC FOR COMPONENT

 

LEAD 688A WAS 688.

INTERCHANGEABILITY OF A COMPLETE BOARD, THIS

C524

4.7/35

X502

QUAD OP-AMP

R521

56K

R546

270

 

 

VALUES AND CIRCUIT CONNECTIONS.

 

 

3

C525

.022/25

 

 

R522

330K

R547

270

 

 

 

 

DIAGRAM MAY NOT SHOW THE EXACT COMPONENTS

 

 

 

 

 

 

 

 

 

 

C526

.47/50

 

 

R523

22K

R548

100

 

 

 

 

 

 

OR CIRCUITRY OF CONTROLS HAVING A COMMON

 

C527

.01/200

 

 

R524

27K

R549

270

 

 

 

 

 

 

CODE NUMBER.

 

 

C528

.022/25

 

 

R525

3.3K

 

 

 

 

 

 

 

 

A.N.S.I. ELECTRICAL SYMBOLS PER E1537

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11-17-95G

 

 

 

 

 

No.

 

 

 

 

 

UNLESSOTHERWISE SPECIFIED TOLERANCECh'ge. Sht.

9-27-85E

11-14-86L

ON ALL ANGLES IS .5 OF A DEGREE 3-6-92B

7-10-92A

3-25-94

ON HOLE SIZES PER E2056 ON 2 PLACE DECIMALS IS .02 ON 3 PLACE DECIMALS IS .002

MATERIAL TOLERANCE t(" ") TO AGREE

WITH PUBLISHED STANDARDS.

THIS SHEET CONTAINS PROPRIETARY INFORMATION

OWNED BY THE LINCOLN ELECTRIC CO. AND IS

NOT TO BE REPRODUCED, DISCLOSED OR USED

WITHOUT THE EXPRESS PERMISSION OF

THE LINCOLN ELECTRIC CO.

CODES

9147

 

 

CONTROL

8400

8993

 

FOR NA-5

N.B.

 

 

NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not avail- able from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the machine.

NA-5

Page 147
Image 147
Lincoln Electric NA-5SF, NA-5NF service manual Voltage PC Board Schematic, Return to

NA-5S, NA-5N, NA-5SF, NA-5NF specifications

The Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S are advanced welding helmets that are pivotal in enhancing the safety and efficiency of welders in various applications. These models are designed to provide exceptional protection and visibility, making them indispensable tools in the welding industry.

One of the main features of the NA-5 series is the auto-darkening filter technology. This feature allows the helmet to automatically adjust its shade based on the intensity of the arc. As the welder strikes an arc, the lens darkens instantaneously, shielding the eyes from harmful rays generated during the welding process. This functionality not only ensures safety but also enhances productivity, as welders do not need to manually flip the helmet up and down.

The helmets are equipped with a wide viewing area that allows for better visibility and precision while working. With a large lens, welders can easily monitor their work and surrounding environment, minimizing the risk of accidents. Additionally, the lightweight design of the NA-5NF, NA-5SF, NA-5N, and NA-5S provides comfort during extended periods of use, reducing neck strain and fatigue.

The NA-5 series is also well-regarded for its durability. Constructed from impact-resistant materials, these helmets can withstand the rigors of demanding work environments. This durability extends the lifespan of the helmet, making it a cost-effective investment for both professional and hobbyist welders.

Another notable characteristic is the adjustable sensitivity and delay settings found in certain models. These settings allow the user to customize the helmet based on their specific welding conditions. For instance, a welder can increase sensitivity for low-amperage tasks or adjust the delay to allow for a smoother transition from dark to light after completing a weld.

Furthermore, the helmets come with a reliable battery life, ensuring that they can be used for long periods without interruption. Some models also feature solar assist functionality, which helps recharge the auto-darkening filter, enhancing their overall efficiency.

In summary, the Lincoln Electric NA-5NF, NA-5SF, NA-5N, and NA-5S welding helmets represent a significant advancement in personal protective equipment for welders. Their combination of auto-darkening technology, wide viewing area, lightweight design, durability, and customizable settings makes them an excellent choice for anyone engaged in welding tasks. With these helmets, users can achieve greater safety and efficiency in their work, enabling them to focus on their craft with peace of mind.