Lincoln Electric NA-5N Service Manual page 150

G-10
OPTION & TIMER PC BOARD SCHEMATICS
A
0
R016
6
OVER
1
5
515
D8C
584
1
TIME R014
2
INITIATE
2 588
13
R012
12
CURRENT
3
OPTION BOARD
4
5
6
7
8
520
B1C
C001
510P
9
B3C
515
D6C
C902 1
500
D9C
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.
E
B C D
515
D8C
D001
583 TIME
X002
R017
OVER
4
A D002
R015
515
500
C004
D8C
D9C
500
D003
588A
D9C
X002
R018
B 3
D004
520
500
B1C
D9C
C002
632 635
B3F C4A
X002 X002
Q001
8 CW
CW
C 11 D 10
X001
SPEED X001
9 VOLTS
4 A 3 9 B 8
5 6
Q002
510P
B3C
562 PROCEDURE
ENABLE
500
D9C
C902
THRU
C906
515
C907
14 D8C 14 D901
D902
X001 X002
1 2 10 7 11 12 13 C003 7
R901
500
THRU
R915
D9C
R916
N.C.
X901
X902
14 16 16 16 16
THRU
X901
X902 X903 X904 X905
X904
12 13 8 8
2 7 C903 8 C904 C906 8
X905
X906
POWER SUPPLY DISTRIBUTION AND BYPASSING
ELECTRICAL DIAGRAMS
F G H
515
D8C
TIMER BOARD
I
X901
R901 8
A 10
INITIATE
9
1 15 9 7 1 15 9 7
515
3 6 3
Q4 Q3 Q2 Q1 Q4 Q3 Q2 Q1
C C
PE PE
D8C
13
CF 12 13 CF
0 0
X902 X903
4
INH INH
MR 10 MR
DP4 DP3 DP2 DP4 DP3 DP2
DP1 DP1
2 14 11 5 2 14 11 5
515 515
D8C D8C
500
D9C
S901A S901B
MOST SIGNIFICANT DIGIT
FOR OPTION P.C. BOARD L6246-2
OR HIGHER USE M16795 SCHEMATIC
FOR COMPONENT VALUES AND
CIRCUIT CONNECTIONS.
TIMER P.C. BOARD OPTION P.C. BOARD
C001 Q001
.022/25 .022/25
THRU Q002
C004
100pf/100
X001
R001 5.6K
1A, 400 10K, 2W MULTI-TURN POT
R002 X002
1A, 400 330
R003
R004 5.6K
10K, 2W MULTI-TURN POT
R005 D001
22K, 1/4W R006 1.8K THRU
4.7K
R007 D004
1K R008 47K
27K
R009
QUAD 2-INPUT NAND GATE 22K
R010
R011 47K
PROGRAMMABLE
R012
DIVIDE-BY-N
THRU 22K, 1/4W
COUNTER
R016
1K
R017
3 DIGIT BCD THUMBWHEEL
R018 1K
SWITCH
J K L M
515
D8C
D901
5
X901
R916
B
4
6 D902
500
1 15 9 7 N.C.
D9C
6 6 3 6
Q4 Q3 Q2 Q1
C
PE
12 13 CF 12
0
1
X904 15 9 7
4 4
INH 3 6
Q4 Q1
Q3 Q2
C
10 MR 10
12
13
DP4 DP3 DP2 0
DP1
X905
2 14 11 5
4
INH
MR 10
515
DP4 DP3 DP2 DP1
D8C
2 14 11 5
515
D8C
FROM
500 500 500 655
PROCEDURE R914
D9C D9C D9C
C907
PC BOARD
100 HZ TIME
S901C
BASE OUTPUT
500
LEAST SIGNIFICANT DIGIT
D9C
KEY TO SYMBOLS
COMMON CONNECTION TO ANALOG POWER SUPPLY
SCHEMATIC LOCATION REFERENCE
HORIZONTAL CO-ORDINATE LETTER
VERTICAL CO-ORDINATE NUMBER
2N 4125
2N 4123 SCHEMATIC IDENTIFICATION LETTER
QUAD ANALOG
N.C. X905 AND C906 ARE USED ONLY ON 100 SECOND
SWITCH
TIMER BOARDS. BOARD JUMPER IS USED ON 10
QUAD 2 INPUT
SECOND TIMER BOARDS.
NAND GATE
UNLESS OTHERWISE SPECIFIED, COMPONENT VALUES OF:
1A, 400V
CAPACITORS = MFD/VOLTS
RESISTORS = OHMS, 1 2 WATT /
SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT
BOARD MAY CHANGE WITHOUT AFFECTING THE INTERCHANGE-
ABILITY OF A COMPLETE BOARD, THIS DIAGRAM MAY NOT
SHOW THE EXACT COMPONENTS OR CIRCUITRY OF CONTROLS
HAVING A COMMON CODE NUMBER.
ELECTRICAL SYMBOLS PER E1537
G-10
O
OVER
NA-5