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G-10
ELECTRICAL DIAGRAMS
CLASSIC II
Idler PC Board (l9902) Schematic
+10V
COM
+10V
COM
+10V
COM
+10V
GND
COM
+10V
COM
COM
1N4936
D1
COM
J1
8
26.7K
R16
+10V
1W
15V
DZ2
15J
50V
TP1
1W
15V
DZ3
1N4936
D3
12Vdc
CR1
2
1
J1
10
100K
R36
CR1
5
4
J1
4
CR1
5
3
1N4936
D6
1N4936
D4
GND
+12V
+12V
COM
COM
IDLER SWITCH
TO FRAME GND THRU MOUNTING SCREW
SOLENOID
FRAME GND
PC BOARD IS CONNECTED DIRECTLY
47.5K
R13
J1
2
18
15V
C8
J1
5
G
D
S
18A
200V
Q3
G
D
S
18A
200V
Q2
X4
1
6
7
X3
10
8
9
100V
.047
C12
100
R8
133K
R15
8A
400V
D2
X3
4
5
6
22.1K
R35
1.00K
R37
100
R20
6.19K
R12
5W
.5
R14
J1
9
16
4536B
8
D
C
DECODE
B
A
Vss
OSC INH
SET
RESET
IN 1
OUT 1
OUT 2
8 BY-PASS
CLOCK INH
MONO IN
Vdd
X2
1
6
3
11
10
2
13
14
5
12
7
9
4
15
ON 2 PLACE DECIMALS IS + .O2
MATERIAL TOLERANCE ("t") TO AGREE
ON ALL ANGLES IS + .5 OF A DEGREE
NOTES :
J1
3
1.82K
R39
6.19K
R38
X4
14
8
9
COM
+10V
WITH PUBLISHED STANDARDS
ON 3 PLACE DECIMALS IS + .OO2
ON HOLES SIZES PER E-2056
HOUR METER
ALT EXC
ENG PROTECT LAMP
FUEL SOLENOID
UNUSED
TP- 1
C- 13
D- 7
VOLTAGE NET
FRAME CONNECTION
COMMON CONNECTION
LAST NO. USED
NO.
SHT.
THE LINCOLN ELECTRIC CO.
THE LINCOLN ELECTRIC CO.
UNLESS OTHERWISE SPECIFIED TOLERANCE
DATE
X- 5
CR- 1
LABELS
Q- 4
SUPPLY
R- 43
J- 2
SUBJECT
EARTH GROUND CONNECTION
POWER SUPPLY SOURCE POINT
GENERAL INFORMATION
.022/50V
(
1A, 400V
THE LINCOLN ELECTRIC CO.
IDLER/ENGINE SHUTDOWN SCHEMATIC
CHK.
ELECTRICAL SYMBOLS PER E1537
RESISTORS = Ohms (
NONE
DIODES =
CLEVELAND, OHIO U.S.A.
1/4W
SCALE
L
NOT SHOW THE EXACT COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON CODE
DR.
MFD
3-14-95
J.R.
CAPACITORS =
THIS SHEET CONTAINS PROPRIETARY INFORMATION OWNED BY
AND IS NOT TO BE REPRODUCED, DISCLOSED OR USED WITHOUT THE EXPRESS PERMISSION OF
WITHOUT AFFECTING THE INTERCHANGEABILITY OF A COMPLETE BOARD, THIS DIAGRAM MAY
N.A. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT BOARD MAY CHANGE
Ch'ge.Sht.No.
SUP'S'D'G.
UNLESS OTHERWISE SPECIFIED)
EQUIP.
(UNLESS OTHERWISE SPECIFIED)
TYPE
UNLESS OTHERWISE SPECIFIED)
9901
B- 1
DZ- 3
CLASSIC WELDERS
FILE: L9901_1BA
NUMBER.
1A
100V
Q4
5W
25
R17
J2
1
1.21K
R40
2.67K
R19
D7
X4
13
10
11
IDLER 12 SEC. TIMER
X3
11
12
13
X3
3
2
1
100
R3
C4
13.7K
R1
C2
4.75K
R5
J2
2
Q1
2N4401
ENGINE PROTECTION
100K
R42
7.68K
R43
6.19K
R18
X4
2
4
5
4.75K
R25
68.1K
R27
50V
0.1
C11
221K
R21
33.2K
R26
10.0K
R41
10.0K
R23
4.75K
R24
33.2K
R4
200V
.022
C10
100V
.047
C1
16
4536B
8
D
C
DECODE
B
A
Vss
OSC INH
SET
RESET
IN 1
OUT 1
OUT 2
8 BY-PASS
CLOCK INH
MONO IN
Vdd
X1
1
6
3
11
10
2
13
14
5
12
7
9
4
15
18.2K
R22
+10V
1.50K
R6
68.1
R33
LM2901
X4
3
12
4093B
X3
7
14
D5
C6
4536B
X1
16
8
C5C7
J1
6
X5
TL431
REF
8
1
6
1.00K
R32
J1
7
J1
1
+
t
56
R34
100
15V
C13
4536B
X2
16
8
3.32K
R30
68.1
R31
R29
50V
.47
C3
5W
10V
DZ1
150
R2
150
R9
150
R11
150
R10
J2
4
162
R7
10.0K
R28
C9
J2
3
+10V
COM
+12V
COM
COM
10.0K
TOROID
REED SW
L
OIL PRESS
RUN SW
9901
TEMP
R
XB
1-19-96
G-10
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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
available 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.