27
SC1900
Troubleshooting
Chart B
Circuit
board,
control
box,
fuse,
breaker
and
L.E.D.
layout
Board
16000
16001
16002
B16001
16060
Name
Digital
Control
Pilot
Arc
Gun
Control
Touch
/
Trigger
Gun
Control
Accessory
Dual
Gate
Drive
LED
1
L1
‐
Gate
Power
GPri
‐
SSR1
L1
‐
PWRA
‐
F1,3
LG4
‐
COIL
Yellow
36
Volt
Supply
Gun
Primary
Touch
Supply
YZ
Output
+15
Vdc
Supply
LED
2
L2
‐
+5Vdc
GSec
‐
SSR2
L6
‐
+5VDC
LG3
‐
GUN
‐
C
RED
‐
Q1
Pos
5V
Supply
Gun
Secondary
Digital
Supply
GLV
Signal
TR1
Active
LED
3
L3
‐
+15Vdc
LR6
‐
PA
L2
‐
WORK
LR3
‐
GUN
‐
C
A
‐
GREEN
Pos
15V
Supply
D1
Pilot
Arc
Output
Stud
On
Work
Indicator
GC
FUSE
Indicator
Channel
A
Selected
LED
4
L4
‐ ‐
15Vdc
LR4
‐
COIL
L3
‐
TRIG
LG2
‐
GUN
‐
P
B
‐
GREEN
Neg
15V
Supply
BR1,2
Output
Trigger
Indicator
GHV
Signal
Channel
B
Selected
LED
5
LG1
‐
PAph2
L5
‐
2WIRE
LR2
‐
GUN
‐
P
RED
Q2
Drive
Signal
Input
#2
Supply
GP
FUSE
Indicator
TR2
Active
LED
6
LR5
‐
PAph1
L4
‐
4WIRE
LG1
‐
ACCESS
Drive
Signal
Input
#1
Supply
ACC
Signal
LED
7
LR1
‐
PAph3
LR2
‐
ACCESS
Drive
Signal
ACC
FUSE
Indicator
FUSE
F2
F1,3
F4
‐
6
AGC
10A
250V
¼
X
1¼
Hand
Tool
1
Coil
1A
125V
FST
5
X
20
mm
LED
1
PWRA
10A
250V
FST
5
X
20
mm
Hand
Tool
2
Coil
BREAKER
BKR
1,2
