Lincoln Electric IDEALARC CV-300 Service Manual page 95

G-8
+8.2V +5.5V
J2
7 D31
CONTROL J2
4 R29
POT
10K
J2
5
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
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
L8930 CONTROL PC BOARD SCHEMATIC
+5.5V
CAPACITOR C7
1.00K
BANK
FEEDBACK
10K
J2
3
C8
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
CROSS
Q1 C26
C2
R47 200mA
30V 35V
4.75K 1000
DZ1 C3
C1 C19 1.0
8.2V
0.1 0.1 35V
500mW
1.00K
50V 50V
D2 D4
+5.5V
D17
+5.5V
D18
R65
15.0K
SHORT
56.2K DETECT
C28
.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
R50
14
475
X3 R53
13
1.00K
R51
475
C21
R52
39.2K
ELECTRICAL DIAGRAMS
+5.5V +5.5V
J4
1
D13
J4
6
J4
4
J4
3
10K 10K
D14
+5.5V
1.50K
D24
C16
D25
+5.5V
10K
C4
1.0
3.5795 MHz 35V
J6
9
C5
16 40
22p PC7 PA7
Y1 J6
100V 2 RES PA6 39
10
X2 J6
5 EXTAL 38
5
J6
6 XTAL PA5 PA4 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 PD7 PD0 PD5 30
+5.5V
8 29
TIMER
7 14
VPP
4 32
PB5 PC5 PB7 PB4
1 25
PB0
20 PD4 PB1 26
VSS VCC
23 PD1 PB2 27
13 PC4 PB3 28
3 INT PC1 10
11 PC2 PD2 22
12 PC3 PC0 9
MC68705R3CP
619 8.25K 3.92K 2.00K 1.00K 511
POWER SUPPLY
30.1
CALIBRATION
NOTE:
SOME OR ALL OF THESE
RESISTORS MAY NOT BE PRESENT
+5.5V
D38
10K R71
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.
BD. POWER
DATA METER
BOARD
CLOCK
+VS
BD. COMMON
30.1 30.1
+5.5V
J4
5
1.00K
VOLT/AMP SW.
J4
2 DZ3
Q7 27V
2.21K 195mA
1W
60V
Q6 D11
C13
R20 200mA
50V .1
30V DZ2
2.21K
+VS 18V
1W
J6 R41 10K
4
+5.5V
+VS
J6
11
J6
12
30.1 30.1
J6
3
1.00K
+5.5V
DZ7
27V
+5.5V
Q5
1W
195mA
2.21K
60V
Q4 D9
C14
R16 200mA
50V .1
30V
2.21K
DZ6
18V
R42 1W
R8
10K
475
LED1
PILOT LED
+VS
30.1 30.1
+5.5V
1.00K
DZ9
Q3 27V
1W
195mA
2.21K
60V
D7
C15 Q2
R12 200mA
DZ8
50V .1
30V 18V
2.21K
1W
R43
10K
+5.5V
4.75K
+VS
3300
5W
R7
DZ5
C9
3V D6
500mW
R31
Q9
200mA 3300 D15
30V 5W
10K DZ4
100K
5.1V
500mW
+5.5V +5.5V
4.75K 4.75K
2
J3
WYE/DELTA
1
J3
GENERAL INFORMATION
4
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)
FILE G2518.1AA
6-18-93
THE LINCOLN ELECTRIC CO.
CLEVELAND, OHIO U.S.A.
NONE
SCALE
DR. M.J.H. DATE 6-2-92 CHK.
IDEALARC CV-300
G-8
J1
GATE 1
3
D12 1.00K
BRIDGE
J1 COMMON
1
J1
GATE 2
4
D10 1.00K
J1
GATE 3
2
D8 1.00K
J2
1
2-4 SWITCH
J2
6
C10
.02
600V
LAST NO. USED
R- _
C- _
LABELS D- _
SUPPLY VOLTAGE NET
POWER SUPPLY SOURCE POINT
COMMON CONNECTION
FRAME CONNECTION
EARTH GROUND CONNECTION
EQUIP.
CV WELDERS
TYPE
SCHEMATIC, CONTROL
SUBJECT
SHT.
OBS G 2518
SUP'S'D'G. NO.