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.
IDEALARC CV-300
ELECTRICAL DIAGRAMS
L8873 CONTROL PC BOARD SCHEMATIC
+5.5V
CAPACITOR
C7
D13
1.00K
BANK
FEEDBACK
10K
D14
J2
3
J2
2
+5.5V
D23
D32
C12
1.00M
D22
1.0
35V
475
22.1K
D35
D34
ANALOG
MULTIPLEXING
D33
OF CONTROL
POT AND
LINE
VOLTAGE
MONITOR
+5.5V
4.75K
PHASE
RELATION
Q8
200mA
+5.5V
POWER
30V
C27
C11
SUPPLIES
+8.2V
+VS
+5.5V
4.75K
D36
X1
R58
IN
OUT
D5
2.7
1W
D1
D3
GND
ZERO
4.75K
475
619
CROSS
Q1
C26
C2
R47
200mA
35V
30V
4.75K
1000
DZ1
C3
C1
C19
1.0
30.1
8.2V
0.1
0.1
500mW
35V
1.00K
50V
50V
D2
D4
D17
+5.5V
D18
R65
15.0K
SHORT
56.2K
C28
DETECT
.0047
50V
2
1
6
X3
R66
3
7
10K
X3
5
SHORT CIRCUIT
C29
.0047
AMPLIFIER
15.0K
50V
R70
D37
100K
+5.5V
47.5K
AMMETER
AMPLIFIER
D26
12
14
R50
475
X3
R53
13
1.00K
R51
475
C21
R52
39.2K
+5.5V
+5.5V
J4
1
BD. POWER
J4
6
DATA
J4
4
CLOCK
J4
3
BD. COMMON
10K
10K
+5.5V
1.50K
J4
5
D24
J4
2
C16
D25
+5.5V
+VS
J6
10K
+5.5V
C4
1.0
J6
3.5795 MHz
35V
J6
J6
9
C5
16
40
22p
PC7
PA7
Y1
J6
100V
2
RES
PA6
39
10
J6
X2
J6
5
EXTAL
38
5
J6
6
XTAL
PA4
PA5
37
8
J6
15
PC6
PA3
36
7
J6
21
PD3
PA2
35
6
J6
18
PD6
PA1
34
2
J6
17
PA0
33
1
24
PB6
31
19
PD5
PD7
PD0
30
+5.5V
8
TIMER
29
7
14
VPP
4
32
PB5
PB7
PC5
PB4
R8
1
25
PB0
475
20
26
VSS
VCC
PD4
PB1
23
PD1
PB2
27
13
PC4
PB3
28
3
INT
PC1
10
11
PC2
22
12
PC3
PD2
PC0
9
MC68705R3CP
8.25K
3.92K
2.00K
1.00K
511
POWER SUPPLY
CALIBRATION
NOTE:
SOME OR ALL OF THESE
RESISTORS MAY NOT BE PRESENT
+5.5V
D38
R71
10K
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