Lincoln Electric IDEALARC CV-300 Service Manual page 97

G-10
+8.2V +5.5V
J2
7 D31
CONTROL J2
4 R29
POT
10K
J2
5
C8
12.1K
D30
2.21K
LINE
VOLTAGE
MONITOR
D19 D21
PHASE
J3
6 R38
RELATION
56.2K
J3
10
WINDING
D20 D29
9
8
X3
4.75K
10
R57
4.75K
C25
+8.2V +5.5V
4 4
C22 C6
X3 X2 0.1
MC68705R3CP 50V
LM224
11 1
ZERO
J3
8
CROSS
WINDING J3
9
+5.5V
D27
C20
1.00K
OUTPUT
FEEDBACK
10K
D28 +5.5V
J2
8
4.75K
J3
7
THERMOSTAT
J3 C23
3
R63
475
R61
475
+5.5V
100K
J10
CURRENT 1
FEEDBACK
J10
2
C18 C17
100K
.02 .02
600V 600V
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
NUMBER.
METER
BOARD
+VS
30.1 30.1
+5.5V
1.00K
VOLT/AMP SW.
DZ3
Q7 27V
2.21K 195mA
1W
60V
Q6 D11
C13
R20 200mA
D12
50V .1
30V DZ2
2.21K
18V
1W
R41
10K
4
+VS
11
12
30.1 30.1
3
1.00K
+5.5V
DZ7
27V
+5.5V
Q5
1W
195mA
2.21K
60V
Q4 D9
C14
R16 200mA
D10
50V .1 30V 1.00K
2.21K
DZ6
18V
R42 1W
10K
LED1
PILOT LED
+VS
30.1 30.1
+5.5V
1.00K
DZ9
Q3 27V
1W
195mA
2.21K
60V
D7
C15 Q2
D8
R12 200mA 1.00K
DZ8
50V .1
30V 18V
2.21K
1W
R43
10K
+5.5V
4.75K
+VS
3300
5W
J2
R7 1
DZ5
C9
3V D6
500mW
J2
R31
6
Q9
200mA 3300 D15
30V 5W C10
10K DZ4
.02
100K
5.1V 600V
500mW
+5.5V +5.5V
4.75K 4.75K
2
J3
WYE/DELTA
1
J3
4 GENERAL INFORMATION
J3 3 SCR/6 SCR
ELECTRICAL SYMBOLS PER E1537
5
J3 CAPACITORS = MFD ( .022/50V UNLESS OTHERWISE SPECIFIED)
RESISTORS = Ohms ( 1/4W UNLESS OTHERWISE SPECIFIED)
DIODES = 1A, 400V (UNLESS OTHERWISE SPECIFIED)
EQUIP.
9-11-92M THE LINCOLN ELECTRIC CO.
TYPE
CLEVELAND, OHIO U.S.A. SUBJECT
NONE
SCALE
M.J.H. 9-13-90 CHK.
DR. DATE
IDEALARC CV-300
G-10
J1
GATE 1
3
1.00K
BRIDGE
J1 COMMON
1
J1
GATE 2
4
J1
GATE 3
2
2-4 SWITCH
LAST NO. USED
R- 82
C- 29
LABELS
D- 38
SUPPLY VOLTAGE NET
POWER SUPPLY SOURCE POINT
COMMON CONNECTION
FRAME CONNECTION
EARTH GROUND CONNECTION
CV CONTROL BOARD
SCHEMATIC
SHT.
G 2003
SUP'S'D'G.
NO.