Lincoln Electric SQUARE WAVE TIG 355 Service Manual page 150

G-4
SChEmaTiC - mETEr pC bOarD (m15892)
5
X5
9 8
X5
J7
+5V IN 2
J7
1 R25
DATA
J7
3 R26
CLOCK
J7
4
COMMON
+5V
14 14
X1 X2
C2
74HC164 74HC164
7 7
+5V
Q1
300mA
D1
30V
3.32K
C1
6
475
R1
D2
1N914
+5V
3.01K 3.01K
13 12 11
X5
1 2 3 4
X5 X5
C5 C6
330p 330p
50V 50V
14 14 14
X3 X5
C7
X4
C3 C4
74HC164 54HC74 HEXINV
7 7 7
NOTES :
N.A. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT BOARD MAY CHANGE
WITHOUT AFFECTING THE INTERCHANGEABILITY OF A COMPLETE BOARD, THIS DIAGRAM MAY
NOT SHOW THE EXACT COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON CODE
NUMBER.
UNLESS OTHERWISE SPECIFIED TOLERANCE
ON HOLES SIZES PER E‐2056
ON 2 PLACE DECIMALS IS + .O2
ON 3 PLACE DECIMALS IS + .OO2
ON ALL ANGLES IS + .5 OF A DEGREE
MATERIAL TOLERANCE ("t") TO AGREE
WITH PUBLISHED STANDARDS
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.
ELECTriCaL DiaGramS
3 8
1
2
4
5
6
7
LED1
9
10
3 +5V
A
X1
4
Q Q
B
5 Q A1 1
C
6 2
Q A2
D
10 Q 8
E CLK
11 9
Q R
F
12 Q Q 13
G H
74HC164
10
X5
+5V
C8
Ch'ge.Sht.No.
2‐16‐90
4‐30‐93A
3 8
1
2
4
5
6
7
LED2
9
10
3 +5V
A
X2
4
Q Q
B
5 Q A1 1
C
6 2
Q A2
D
10 Q 8
E CLK
11 9
Q R
F
12 Q Q 13
G H
74HC164
+5V
14
1 RESET 1 VCC
2 RESET 2 13
DATA 1
3 CLOCK 1 DATA 2 12
4 11
SET 1 CLOCK 2
5 Q1 SET 2 10
6 X4 9
/Q1 Q2
7 GND 54HC74 N.C. 8
GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537
CAPACITORS = MFD ( .022/50V UNLESS OTHERWISE SPECIFIED)
RESISTORS = Ohms ( 1/4W UNLESS OTHERWISE SPECIFIED)
DIODES = 1A, 400V (UNLESS OTHERWISE SPECIFIED)
NOTE: ALL UNMARKED RESISTORS = 100 OHMS
EQUIP.
THE LINCOLN ELECTRIC CO.
TYPE
CLEVELAND, OHIO U.S.A.
SUBJECT
NONE
SCALE
DR. JCP DATE 01‐06‐89 CHK.
G-4
3 8
1
2
4
5
6
7
LED3
9
10
3
A +5V
X3
4
Q Q
B
5 Q A1 1
C
6 2
Q A2
D
10 Q 8
E CLK
11 9
Q R
F
12 Q Q 13
G H
74HC164
LAST NO. USED
R‐ 28
C‐ 8
LABELS
D‐ 2
SUPPLY VOLTAGE NET
POWER SUPPLY SOURCE POINT
COMMON CONNECTION
FRAME CONNECTION
EARTH GROUND CONNECTION
CV WELDERS
METER P.C. BOARD SCHEMATIC
SHT.
M M
15892
SUP'S'D'G. NO.
SQUarE WaVE TiG 355