Jasic AC/DC315P Quick start guide

The general connection diagram of AC/DC315P/250P:
CONTROLMODULE
ELECTRICDIAGRAM
TopBoard
DRIVEMODULE
PK-03-A1
DC24V
AC/DC315P
VH-03
VH-02
VH-02
THERMALSWI TCH
ControlBoard
VH-03
14V
14V
00
AC380V
AC220V
(VH-04)*2
DRIVELINE
XH-02
XH-03
VH-02
XH-03
DC12V
VH-02
XH-04XH-03 VH-03XH-04
CON11
CON6
CON1 CON3 CON5
CON8
CON7
CON10
CON2
CON4
CON9CON14
CON15CON12CON13
ME TERCONTROLSIGNAL
REMOTERESISTANCE
PK-08-A1
PM-04-A3
CON3
CON1
Port
Port
CP3
CP2
INPUTAC380V
CON62 CON4CON5
CON8/CON7
DC532V
CON6
CON3
CON2
AC220V
CON5
PH-20-A1
CON4CON6
AC220V FAN*2
PZ-03-B0
BOTTOMBOARD
CON3
VH- 0 4
CON1
CENTERBOARD
PD-13-B0
VH-09(8)
CON3
+
-
+
-
OUT1
OUT2
INVERTERBOARD
PN-05-A2
PN-06-A1
CON11
CON1
ARC FORCE
CON12
PROTECT LED CURRENT
CON13
CON14
THERMAL SWITCH
CONTROLBOARD
PK-31-A0
CON1
VH-05
VH-04
50W450R*4
CON1CON5
PK-09-A3
DRIVE BOARD
CON15
CON3
AC20V*4
0
AC380V AC220V
T
T
CON2ORCON4
XH-03(2)
PH-10-A2
GunSwitchBoard
Gun switch
CON9
CON10
2T/4T
CON5
AC/DC
CON6CON7
ARC/TIGCONTROLGAS
CON8
CONTROLHF
CON2CON3
CONTROL PULSE
CON4
PH-10-A01
CON15 DC12V
PK-05-A4
PK-31-A0
CONTROLBOARD
CP1
Port
DC+24V
HF BOARD
PZ-35-A0
CON2
HF
CON1
CON4
CON2
GAS
+24V
CON3
+24VCONTROLGAS（PK-31-A0 CON7）
The diagram of AC/ DC315P/250P’s top PCB PM-04-A3, center PCB PD-13-B0, bottom PCB
PZ-03-B0, HF PCB PZ-35-A0, control panel PK-31-A0, control PCB PK-05-A4, control module
PK-03-A1, AC drive PCB PK-09-A3 and inverter PCB PN-05-A2 and PN-06-A1:
ORPK-05-A4 PK-170-A2

版 本图 幅 共 张
设 计
批 准
审 核
日 期
标记 数量 更 改 单 号 签名 日期
A2 第 张
Error : JASIC.jpg file not found.
1
2
3
4
S25VB
1
2
3
4
S25VB
1
2
3
4
S25VB
SW2
8D-208D-20
+24
1W/150K
470U/450VX3470U/450VX3
1W/150K
1
2
3
4
5
6
7
CON8
bottom board PZ-03
SW1
1
2
3
x9
1W/150K
470U/450VX3470U/450VX3
1W/150K
1W/150K
470U/450VX3
1W/150K
1
2
3
4
5
6
7
CON3
472/3KV
472/3KV
475/630VX3
2611X6
2611X6
2611X6
2611X6
5W/47471/2KV 471/2KV
5W/47
10
10
10
10
PK-08-A2
top board PM-39
200:1
5W/47
5W/47
471/2KV
471/2KV
1
2
3
4
5
6
7
CON1
1
2
3
CON2
1
2
3
CON1
9:3X3
221/1KV
221/1KV
D92M-02
1W/22
1W/22
FML333
分流器
22:22
22:22
14D391 103/630V
arc starting coil
103/630V103/630V
51
51
IRFP260X12
IRFP260X12
D92M-02
IRFP260
103
100uF/400V
475/250V
104/630V
51
51
IRFP260X12
IRFP260X12 104/630V
75:160
J1A
104/630V
102/10KV
Port
Port
secondaryinverter board(up) PN-06secondardyinverter board(down) PN-05
123
CON1
output
475/250VX4
1W/5.1K 14N330
IN6295
150K/1W
160/50W
20D151
1K
1K
2K
102/3KV
102/3KV
102/3KV
102/3KV
RP1H RP1H RP1H
510k
HF discharging nozzle
102/10KV
Z24 Z24
9Z24
9Z24
IN4148 22 22 100
201
100uF 105
IN4148
1234
CON13
501
to drive module
22 22
100
IN4148
201
control module PK-03
10K
+5V
100
104
1.5K
1
2
3
4
CON1
100K
5v
1 2 3 4
CON12
23 25 27 29
15
16
1K
613
IN5408
IN5408
3300uF/35V
Vin
1
GND
3
+12V 2
LM7812
10uF/16V
FR104
220K
103
104
10K
1K
10
501
Z44
0.1
47K
5.1K
104
D92M-02
10
3300uF/35V
6
3
7
1
2
4
8
5
+12V
104
104 +12V
2K
+24V
T1 +5 3
2
Vin
1
LM7805
10uF
3W82
104
104
104
8
4
11
3
1
2
3
CON2
123
CON3
100
123
CON6
7
表头
preset
long strip board PK-170
510
18
12
CON14
1 2
CON15
24V
1/1/2W
21
30 5
2910
1
2
3
CON9
24V
pin
123
CN11
3.9K +24V
RED
100
104 33K5.1K
5.1V
IN4148IN4148
51K
103
8050
22K
+12
1
2
3
CON10
12
CON4
103
24V 1
2
3
4
CON5
100K
103
1213
U1F
1 2
U1A
3 4
U1B
89
U1D
5 6
U1C
1011
U1E
D1
J1
R2
R1
R3
1213
U2F
1 2
U2A
3 4
U2B
89
U2D
5 6
U2C
1011
U2E
D3
J2
R6
R5
R7
1213
U3F
1 2
U3A
3 4
U3B
89
U3D
5 6
U3C
1011
U3E
D5
J3
R10
R9
R11
1213
U4F
1 2
U4A
40106
3 4
U4B
89
U4D
5 6
U4C
1011
U4E
D7
J4
R14
R13
R15
Q1
Q2
Q3
Q4
Q7
Q8
Q5
Q6
C3
105
C4
22uF C5
100uF
DZ1
1N4001R4
2K
C7
104
C8
105
C9
22uF C10 100uF
DZ2
D4 1N4001
R8
2K
C12
104
C13
105
C14
22uF C15 100uF
DZ3
D6
1N4001
R12
2k
C18
105
DZ4
R16
2K
Vin 1
GND
2
+15V
3
U5
LM7815
Vin 1
GND
2
+15V
3U6 LM7815
Vin 1
GND
2
+15V
3
U7LM7815
1
2
3
4
5
6
7
8
104
10K
0
14
+27V
12
CN?
A1A2A3A4
A1A2 A3A4
1234 X4 12345
X3
B1
B2
B3
B1 B2B3 12345678
feedback
14
1
2
3
4
5
X1
104
F1
F2
F1
F2
F3
380
220
0
1
2
3
x9
F4
F5
F6
1
2
CON8
F7
F8
F9
drive board PK-09
center board PD-13
120K
12V
A5 A6
arc force
L1
1 2
CP1
U5A
1
2
3
C15
D6
D8
3 4
U8B
89
U8D
5 6
U8C
1213
U8F
1 2
U8A
R7C42
R55
R39
C5
+12
+12
C16
D16
D14
R25
R49
D11
D
9
Q13
CLK
11 Q12
R
10 S8
U2
R11
D12
l5
l6
1
2
3
CON9
12
CON10
D3
D27
D4
D19
D22
Q1
VR6
VR9
R45
R23 C25
R14
C19
R12
C20
+12
R8
C24
R16
VR5
R15
C6
R2
C1
VCC
Z2
1
2
3
4
CON7
Q6
Q5
C26
C27
L7
U7U7
R5
23
4
1
1
2
CON6
12V
D18
D14
D28
D18
R65
R68
R64
R62 R59
R69
12V
1
2
3
4
CON15
VCC
C11
U5C
C28
+12
8
910
11
L4
L3 Q3
R38
1
2
3
CON4 R46
R35
R16
R41
R37
12V
D16
R63
R71 D25
R66
R72
VR7
U4A
U5B
C21
R47
Q4
R67
R61
R58R74
R50
20K
R43
R42
12V
D26 5
6
712V
5
6
7
U5D
12
13 14
C29
R70 U4A
C4 C11
C18
1
2
3
CON11
5V
VR8
R19
D24
12
CON2
VR2
R36
R31
R40
R34
12V
Z4
VR3
R4
R10
12V
U7D U6
D15
D13
D13
D5
D17
D7
D21D10 R48
12V
12V
R73
R76
C13
C17
U3
U1
R33 L2L1
C2
D28 D30
D31
D29
R44
R51
R54
R29
R75
5V
LED2
C22 C23
12V
1
2
3
4
5
CON14
1
2
CON14
R6
1
2
CON8
R24
12V
56
5
67
8
4
HF
thermal switch
2T/4T
PEDAL
给定
hand switch
puse choose
ARC/TIG
arc force
1
2
3
CON1
VR1
12V
R28
1
2
J1
front panel board PK-171
D?
1
2
CON12
气延时
12V
489
U4A
11
12
13
14
12V
12V
8
9
10
duty ratio
4
5
6
7
11
LM324
U6C
12V
3 1
2
GNDIN
OUT
U9
LM7812
C7
C10
C18
C13
D23
D22
D9
D21
Z3
R51R48
R26
R21
R27
R20
R22
R18
R9
R17
12 CON5
12V
Q2
12V
12V
12
3
R66
VR4
1314
AC/DC
12
U6B
4
12v
1111
U6D
12v
12
D
12V
100k
R42
12
12v
current preset board
transformer
VR1
preset base currentpost flow down slope
pulse frequency AC duty ratio pre-flow
arc force
VR2 VR3 VR4 VR5 VR6 VR7 VR8 VR9
pulse duty ratio
knobs on front panel
Q1
MOSFET N Q2
z24
R2
39K
R3
20K C5
104
D4
in4004
D2
IN4004
24V
C6
103
C7
103
12v C4
104
10A/24V
Q?
8050
R?
22K
R?
2K
10A/24V
J1A
1
2
3
4
CON3
24v
CP2
1
2
3
CON2
1
2
3
CON4
B4
B5
B6
B4
B5
B6
C1
C2
0011
solenoid
C1C2
C3
C4
C5
C3C4
C5
C6
C7
C6
C7
A5A6
C8
C9
C10
C8
C9
C10
E1
E2
E1
E2
E3
E4
E5
E6
E3
E4
E5
E6
E7
E8
E9
E10
E11
E7
E8
E9
E10
E11
E12
E13
E12E13
5V
sin
digital display
F7 F8 F9
D1
D2
D3
D4
D5
D6
D7
D8
D1D2D3D4D5D6D7D8F1F2
A
- +
AC 220V
F2
F3
SW2
MMA/TIG
SW3 2T/4T
SW5
SW4 AC/DC
S1
G1
G2
hand switch
G3
G4
G1
G2
G3
G4
G5
G6
G7
G8
G5
G6
G7 G8
G11
G12
G9
G10 T1
IN4004
IN4004
IN4004
IN4004
100UF/50V
2K/1/4W
C1
L1
C2
D92M-02
J1A
24VDC
12 CON3
1 2
CON2
123
CON1
F4 F5F6
380 220 0
G13G14
G11
G12
103
HF board PH-63
SW6
G13
G14
G9
G10 puse
choose
475/250V
14D391
balance circuit
（PH-107-A0）
heat sink
15V
15V
1M
103
FDZ
1K
5v
12v
FR104
A0
R63 YL
WSE-315P原理图
C9
22uF
C10
100uF
D4 1N4001
Vin 1
GND
2
+15V
3LM7815
1
2
3
4
5
6
7
8
9
10
CN?
D9
D10
D9
D10

设 计
批 准
审 核
日 期
标记 数量 更 改 单 号 签名 日期
版 本图 幅 共 页
A4 第 页
深圳市佳士科技股份有限公司
Error : JASIC.jpg file not found.
PCB:PK-03-A3
CSS
8
IN+
2RT 6
IN-
1
CT 5
OSC SYNC
3COMPN
9
SD
10
DISC 7
VCC 15
VREF
16
OSC OUT 4
OUTB 14
OUTA 11
GND
12
VC
13 U3
SG3525AP
R28
100Ω
R25
6K2
C15
102
C16
104
R20
1K
R22
2K
R21
10K
C13
222
+12V
R19
100Ω
C12
684
Q9
8550
Q7
8550
Q6
8050
Q8
8050
R31
51Ω
R33
51Ω
+12V
+12V
D10
15V
C20
104
R34
10K
D11
4148
D9
4148
R32
10K
D8
15V
C19
104
+12V
3
26
74
5 1 8
U1
CA3140
C2
102
C3
501
R7
20K
R3
100Ω
R5
1K
R2
220K
R8
5K1
R17
5K1
D5
4148
R23
6K2
C14
222
D7
15V
R29
2K
R30
22K
R26
680Ω
Q5
8050
Q4
8050
R24
1K
+24V
+24V
Q3
MCR100-6
C17
104
C9
104
C1
472
D1
LED2
D2
LED1
R11
20K
2
10
12
14
17
1
+12V
21
30
+24V
+12V
4
11
13
+24V
25
23
29
27
R6
2K
R16
30K
C10
103
Q2
8050
+12V
C7
47uF
D3
4148
C6
4.7uF
R9
15K
18
R10
5.1K
6
5
NC
9
19
20
22
24
31
R27
51
16
28
3
15
R14
10K
8
R4
8.2K
R15
20K
R13
30K
C18
104
C4
222
+24V
D4
4148
250系列/ARC200B控制模块
RT1
10K
R18
10K
C11
103
C5
104
R1100k
R12
10K
7
C8
103
R35
30K
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1
3456781113182325272829
3
6
4
7
18
13
11
8
27
29
23
25
Q1
8050
+12V+24V+24V+24V
U2 PC817
2011/10/26 A0
R06-24.1 YL

R1 R4 R6 R10R14 R17 R19 R21R23R27 R30 R33
R32R31R26R22R20R18R16R15R9R5R3R2
R12
R13R25 CON3 C14C13
C2 C8
C9C1 R29
R28
R8
R7 R24
C10
C11
C12
C7
C6
C5
C4
R11
RT1
CON1
CON2
U2 U4U6 U8 U10 U12 U14 U16U18 U20U22 U24
U23U21U19U17
U15
U13U11U9U7U5U3U1
2006.02.08
PM-04-A3
1111
R11
R9
R10
L1
CON3
D8
D7
CON1
D1
R3
C2
C1
R2
U9 U10U11U12U1 U2 U3 U4 U5 U6 U7
U20U16U24
U17U19
U18
U13U23U22U21
U8
T3 T1
T2
T4
U14U15
R4
C4C3
R1 R6
C6
C5
R5 R8
C8
C7
R7
R13
C12
R12R17
C14C13
R16R15
C10
C15
R14
R19
C17
C16
R18
C11
D2
RV1
C9
AC/DC315/315P/TIG315 (T)2005.09PD-13-B0

+
+
++
++
RT1
CON7
R1
R2
R5
R6
R4
R3
C5C6
C3C4
C2
C1
CON8
CON1
RELY1
CON2
CON4
CON5
CP1
CP2
CP3
CON6
CON3
RT2
X4
X3
X2
2005.09
PZ-03-B0
AC/DC.TIG(T)
D6
C8 C10
Q1
R5 R4
D5
VT1
R3 R6
CON4
D1
D2 D3
R2
R1
CP2
CP1
C1
C3
C2
C5
D4
C6
T1
CON1
C4
RELAY1
Z1
CON3
VT2
C9
CON2
C7
PZ-35-A0
2006.03.06
P1 P2

-
+
-
+
+
-
+
-
-
+
D18
D22
D1
D2
Z1
D24
D26
D25
D23
Z5
D6
D11
D8
D16
D14D12
Z4
D9
Z3 D7
D5
D13
D10
D15
D20
D17
D21
D27
D4
D3
Z2
D19
D28
D30
D29
C18
R32
R45
R72
Q1
R15
C1
C17
C8
R1
C9
R4
CON5
Q3 Q4
R35
R37
R41
C29
R70C26
C27
R6
R13
R18
R59
R62
R64
R65
R68
R58
R61
VR4
U7
U6
U5 U8
U3
CON6
CON10
CON9
CON7
CON11 CON12LED1LED2
VR7
VR1
VR6VR8VR9
VR2VR3
VR5
U4
R12R9 R10
R2
R5
R19
R21R22R23R24
R27R29R30
R33
R34
R38R39
R42
R25
R43R44
R46R47 R48
R50
R54
R51R52
R56R55
R57
R60
R69
R71R73
R74 R76
CON13CON15
D32
D31D34
D33
C23
C22
U9
U2
R7
R11
CON8
L2
L1
U1
C3
C5
L6
L5
C2
R53
C15
C16
R63
R66
C21
C28
R67
C25
CON4
R8
CON3
CON2
CON1R3
Q2
C10
R17
R40
R36
R31
C4
L4
L3
C12
R20
R26
Q5 Q6
C24
C19
R14
R16
C6
C20
R75
L7
R28
C13
R49
C7
CON14
C14
C11
PK-31-A0
2006.02.08
+
+
+
C13
C12
C5
C17
C2
C8
CON3
CON2
R5
U1
C7
D1
C6
Q3
Q4
U4 U5
C1
C4
R1
U3
U2 Q2
Q1
C3
C10 Q5
Q6
U8
U6
R10
U7
D5
C11
C9
C16
CON1
U10
U9
Q8
Q7
C14
D7
C15
U11
R13
CON5
CON4
R3
R7
R11
R15
D2
Z1 Z2Z3 Z4
D6
D3
D4
R14
R6
R2 R4
R8
R12
R16
R9
2006.02.08
PK-09-A3

++
+
+
+
CON12
CON3
CON6
R2
R3
C9
R11
R12
R5
C1
C19
R30
z1
R29
D7
Z2
D1
D3
D4
D11D12U6 Q2
CON1
C21
C14
CON10
C11
C5
CON15
CON14
CON5
C3
CON13
R27
R31
R23
R26
C15
C22
R33
R22
R25
R4
U3 U5 U4
U2
Q1
C28
C29
C24
R17
CON11
C2
CON2
C4 C6
R6 R7
R9
CON4
LED1R8
R32
U1
U9
D6
D5
CON9
C8
C18
L1
U7 C34
C33
C26
C13
C27
C16
C25
C12
C20
U8
R19D8
D10
R10
R13
C31
CON7 CON8
R14
R20
R18 R16
R15
R24
R28
R35
R1
C32
C23
C17
R34
C10
C30
R21
PK-05-A42006.02.08
C13
D1
C12
C7
LED2
LED1
R4
P1
R14R17
R29
R16
R31
R25
R21
R19D5
R28
C8
R15
C15
Z2 Z3
R7
R6
C4
R23
R32
D4
D3D2
Z1
R12
R13R9
R1
R2
R8
C6
C9
C5
C18C1 C2
R30
U2
Q5
Q8
Q7
Q4
C16
Q9
Q1
Q3
C14
U3
C17
C10
C11
Q2
R24
R22
R18
R3
R27
R5
R11
R10
Q6
R26
C3
R20
U1
PK-03-A1 2006.02.08

C1
1
17
VT13 VT14 VT15 VT16 VT17 VT18 VT19 VT20 VT21 VT22 VT23 VT24
Z1
Z2
A2
A3
A1
Z4
Z3
12
7
VT1 VT2 VT3 VT4 VT5 VT6 VT7 VT8 VT9 VT10 VT11 VT12
R1 R12R11R10R9R8R7R6R5R4R3R2
16
2
5
4
3
_1
_2
_3
9
13
11
10
14
R24
R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23
8
15
6
PN-06-A1
2005.09
AC/DC250B.315(T)
CON1
R13
3
6
C2
1
8
VT14 VT15 VT16 VT17 VT18 VT19 VT20 VT21VT22VT23 VT24 VT25
C1
Z3
R14
D1
R15
Z1
Z2
A2
A3
A1
Z5
Z4
_8
_3
D2
C6
C3
VT13
C8
C7
C4
VT1 VT2 VT3 VT4 VT5VT6 VT7 VT8 VT9 VT10VT11VT12
R1 R12R11R10R9R8R7R6R5R4R3R2
_12
_1
4
2
5
7
_5
_9
_7
_6
_4
_10
_11
_2
D3
R27R16 R17 R18R19 R20R21 R22R23 R24 R25 R26
C5
X2
PN-05-A2
AC/DC250B.315(T)
2005.09

4.4 Troubleshooting of AC/DC315P/250P:
TroubleAnalysisSolution
1. Turn on the machine, no
display of the meter, the fan
doesn’t work, no no-load
voltage output in TIG/ARC
mode.
a. The input voltage is abnormal.
b. The power supply cable isnot in good
connectionwith CP1/CP3 on bottom PCB
PZ-03-B0, or the tie-in is damaged.
c. The power supply switch may be
damaged or unclosed.
d. The connecting cable matching socket
CON1-CON6on power supply
conversion PCB PH-20-A1 is in loose
connection.
a. Check if the input voltage is AC
380V.
b. Check.
c. Check and replace it if necessary.
d. Check.

2. Turn on the machine, the
meter displays, press the
welding torch switch inTIG
mode, there isgas out, no HF,
turn to ARC mode, no no-load
voltage output.
a. The connecting cable matching socket
CON7/CON8 on bottom PCB PZ-03-B0
is in loose connection.
b. The prime relay RELAY1 onbottom PCB
PZ-03-B0 doesn’t close well; the value of
resistor RT1/RT2 increases.
c. The connecting cable matching socket
CON2/CON4/CON5 on bottom PCB
PZ-03-B0 withrectifying bridge is in loose
connection.
d. Some part on control module PK-03-A1 is
damaged.
e. Some part oncontrol PCB PK-05-A4 is
damaged.
a. Check and make sure the voltage
of socket CON1 is DC532V.
b. Check and replace if necessary.
c. Check.
d. Check with a multi-meter if chip
U1 onPK-03-A1 isdamaged.
Check if the 16th pin of U1 is 5V. If
it’s not, replace the chip because
U1 is damaged. Check if diode
D2/D3/D4, audion Q2/Q3/Q4/Q5/
Q6/Q7/Q9, thyristor Q1, zener
diode Z1/Z2/Z3, capacitor C17 or
resistor R32 is damaged.
e. Check if MOSFET U2/U3/U4/U5
or resistor R32 is damaged.
3. Turn on the machine, the
meter displays, but the thermal
resistor RT1/RT2on bottom
PCB PZ-03-B0 heats and
smokes after a while.
a. The connecting cable (+24V) matching
socket CON1 on bottom PCB PZ-03-B0
with socket CON14 on control PCB
PK-05-A4 is in loose connection.
b. The relay RELAY1 on bottom PCB
PZ-03-B0 is damaged.
c. The auxiliary power supply part on
control PCB PK-05-A4 is damaged.
a. Check.
b. Check.
c. Check with a multi-meter if
resistorR35, MOSFET U1, audion
Q2, chip U6 or capacitor C32 on
control PCB PK-05-A4is
damaged.

4. Turn on the machine and it
appears normal, there is
no-load voltage output in ARC
mode, press the welding torch
in TIG mode and there is gas
out, the malfunctionLED isnot
on, no HF.
a. The connecting cable matching socket
CON2 on top PCB PM-04-A3 with socket
CON1 on HF PCB PZ-35-A0 is in loose
connection.
b. High voltage silicon granule
D1/D2/D3/D4or high voltage output
capacitorC6/C7onbottomPCB
PZ-27-A0 is damaged.
c. CP1/CP2 isdisconnected with the HF
PCB.
d. The discharge nozzles P1/P2 on HF PCB
have conglutination, excessive clearance
or serious oxidation problem.
e. The ARC/TIG conversion switch onthe
panel or chip U7 oncontrol panel
PK-31-A0 is damaged.
f. The connecting cable matching socket
CON8 on control PCB PK-31-A0 with
socket CON4 on HF PCB PZ-35-A0 is in
loose connection, or HF relay RELAY1,
audionQ1, MOSFET VT1 or diode D5 on
HF PCB is damaged.
a. Check.
b. Check.
c. Check.
d. Adjust or replace it if necessary.
e. Check and replace it if necessary.
f. Check. Method: short-circuit the
socket CON4 on HF PCB
PZ-35-A0, and turn on the
machine, if no HF, the HF circuit
on HF PCB goes wrong; if there
is, the inductor L1/L2, chipU1/U3
or resistorR6 oncontrol PCB
PK-31-A0 is damaged.

5. Turn on the machine, and it
appears normal, press the
welding torch switch and there
is gas out, the malfunction LED
is on. Turn to ARC mode, the
malfunction LED turns on.
a. Over-current protection occurs when
welding is carried out.
b. Over-heatingprotection occurs when
welding is carried out.
c. Some partsontop PCB, center PCB, or
bottom PCB are damaged.
a. Turn off the machine for 5mins
and restart.
b. Stop the welding operation for
5mins, or the secondary inverter
thermal switch is damaged.
c. Check. Turn off the machine, pull
out the connecting cable matching
the socket CON2 on top PCB
PM-04-A3 with the socket CON1
on HF PCB PZ-35-B0, turn on the
machine. If the malfunctionLED is
off, the transformer T1 on HF PCB
is short-circuited or damaged. If
it’s on, turn off the machine, pull
out the connecting cable matching
socket CON1 on top PCB
PM-04-A3, turn on the machine. If
the malfunction LED is on,
MOSFET U1-U24 on top PCB or
some part on drive module
PK-08-A1 isdamaged; if it’s off,
transformerT1/T2/T3/T4 or
rectifying diode U1/U24 oncenter
PCB PD-13-B0 is damaged.

6. Turn on the machine and it
appears normal, it can start arc
in TIG mode, but the welding
point appears black.
a. The magnet valve or the gas tube is
blocked.
b. The magnet valve is damaged.
c. The connecting cable matching socket
CON3 on HF PCB PZ-35-A0 with socket
CON7 on control panel PK-31-A0is in
loose connection.
d. Some part in the magnet valve control
circuit on HF PCB PZ-35-A0or on control
panel PK-31-A0 is damaged.
e. The welding torch is damaged.
f. The tungstenis of bad quality or the
argon is impure.
a. Clear.
b. Replace.
c. Check.
d. Check with a multi-meter if
MOSFET VT2, diode D6, zener
diode Z1 on HF PCB or audion Q1
on control PCB PK-31-A0 is
damaged or if the magnet valve
control cable matchingthe socket
CON2 is disconnected.
e. Remove the welding torch and the
gas-electricity tie-in, and press the
welding torch switch. If there is
gas out, the welding torch is
damaged. Replace it.
f. Replace them if necessary.
7. The welding current is
unstable and out of control. a. The connecting cable matching socket CON2 on control PCB PK-05-A4 with
socket CON11 on control panel
PK-31-A0 is in loose connection.
b. The capacitor C1/C2/C3/C4/C5/C6 on
bottom PCB PZ-03-B0leaks or is
damaged.
c. The input cable or output cable istoo slim
and too long.
d. Loose connection existsinside the
machine, e.g. the connectingcable
matchingsocket CON4 on control panel
with the remote control.
a. Check and replace it if necessary.
b. Check and replace it if necessary.
c. Enlarge the cross section area of
the cable.
d. Check.

8. Turn on the machine but it
strips. a. The rectifying bridge matching the socket CON2/CON4/CON5 on bottom PCB
PZ-03-B0 is damaged.
b. The power supply cable isdisconnected
or short-circuited.
a. Replace.
b. Check.
9. Whenin TIG mode, adjust
the value of the decay
potentiometer to the maximum
and release the welding torch
switch, the gas valve shuts off,
and no current output.
a. The diode D1/D2 or chip U3 on control
panel PK-10-A1 is damaged. a. Check and replace it if necessary.
10. Press the welding torch
switch, there is HFdischarge
buzz, but nowelding voltage
output.
a. The earth cable of welding torch isin
loose connection.
b. The output terminal of the earth cable is
in loose connectionwith gas-electricity
tie-in.
a. Check and replace it if necessary.
b. Check and replace it if necessary.
11. The arc starting is bad in
TIG mode. a. The space between discharge nozzles P1 and P2 on HF PCB PZ-34-A0 is too
big or small, or their surface is badly
oxidized.
b. The high-voltage capacitor C3/C4 on HF
PCB is damaged, orthe capacitance
becomes smaller.
c. The tungsten is of bad quality or argon is
impure.
d. The welding torch is loose or broken.
e. Incorrect turn rateorturn-to-turn
electricity leakage problem exists in
arc-starting coil matchingCP1/CP2 on
HF PCB.
a. Adjust the space betweenthem,
or clear their surface.
b. Check and replace it if necessary.
c. Check and replace it if necessary.
d. Check.
e. Check.

12. Turn onthe machine, and it
appears normal, but the
malfunction LED turnson once
welding is carried out.
a. The connecting cable matching socket
CON11 oncontrol PCB PK-05-A4 with
the output bypass is in loose connection.
b. Loose contact existsin MOSFET
VT1-VT24 on top PCB PM-04-A3or
rectifying diode U1/U24 oncenterPCB
PD-13-B0.
c. Some part on control module PK-03-A1 is
damaged.
a. Check.
b. Check with a multi-meter.
c. Check if the chip U2 oraudion Q9
on PK-03-A1 is damaged.
13. Turn onthe machine, and
there is HF. a. Some parts in manual switch control circuit are damaged.
b. The connecting cable matching socket
CON8 on control panel PK-31-A0 with
socket CON4 on bottom PCB PZ-35-A0
is in loose connection, or chipU1 on
control panel PK-31-A0 is damaged.
a. Check with a multi-meter if chip
U8 or diode D14/D18 on control
panel PK-31-A0 is damaged.
Disconnect the connectingcable
matchingthe socket CON9,
short-circuit both terminal of
socket CON9 and check if the
manual switch board PH-10-A1 is
short-circuited.
b. Check.
14. IncessantHF exists when
welding is carried out. a. The relay RELAY1, audion Q1, diode D5, MOSFET VT1 on HF PCB PZ-35-A0 or
chip U1 on control panel PK-31-A0 is
damaged.
b. The connecting cable matching socket
CON13 oncontrol panel PK-31-A0 with
socket CON5 on control PCB PK-05-A4
is in loose connection.
a. Check and replace it if necessary.
b. Check.

15. There is deviation between
the preset value and real value
of the show value of the meter.
a. The value of the variable resistorR9 on
control PCB PK-05-A4 orVR1 on preset
PCB PH-10-A01 changes.
a. Adjust. Methods: 1. Turn to ARC
mode, adjust the value of variable
resistorR9 on control PCB
PK-05-A4 to make the showvalue
of the meter be the value of the
correspondingmachine type. 2.
Turn to TIG mode, do not press
the manual switch, adjust the
value of variable resistorVR1 on
preset PCB PH-10-A0 to make the
showvalue of the meter be the
value of the corresponding
machine type.
16. No pulse when in pulse
mode. a. The panel pulse conversion switch is damaged.
b. The connecting cable matching socket
CON2/CON3 on control panel PK-31-A0
with the pulse conversion switch is
short-circuited, or chip U4, capacitor
C4/C11, potentiometer VR2/VR3 ordiode
D24 is damaged.
a. Check and replace it if necessary.
b. Check.
17. Whenno-load in ARC
mode, it appears normal inDC
mode, but there isabnormal
sound in AC mode.
a. Some MOSFET on the secondary
inverter PCB PN-05-A2/PN-06-A1 is
damaged.
a. Check. Method: Turn toARC
mode, then ACmode, turn off the
machine after 3mins of no-load,
touch the MOSFET on the
secondary inverter PCB with your
hand one by one. The extra hot
ones are damaged.
18. No 4Tstate or 4T is
inaccurate. a. The 2T/4T conversion switch on the panel is damaged, or the connecting
cable matching it with socket CON10 on
control panel PK-31-A0 is in loose
connection.
b. Some part oncontrol panel PK-31-A0 is
damaged.
a. Check.
b. Check if chip U8/U2, diode D6 or
capacitor C2 on control panel is
damaged.

19. No AC output in AC mode. a. The AC/DC conversionswitch on the
panel is damaged.
b. Some part on the control panel PK-31-A0
is damaged.
c. Some part on the secondary drive PCB
PK-09-A3 is damaged.
a. Check.
b. Check if the diode D9/D2/D1, chip
U6, audion Q2 or potentiometer
VR4 oncontrol panel PK-31-A0 is
damaged.
c. Check with a multi-meter if chip
U2/U4/U8/U9/U3, audionQ1-Q8
or zener diode Z1/Z2/Z3/Z4 on
drive PCB is damaged.
20. No AC sound when welding
in AC mode. a. The value of the resistor matchingsocket CON1 on inverter PCB PN-05-A2 varies.
b. The MOSFETVT13, rectifying diode
D1/D3, resistor R14/R13 or zener diode
Z3 on inverter PCB PN-05-A2is
damaged.
a. Check and replace it if necessary.
b. Check and replace it if necessary.
21. Press the welding torch
switch, there is gas out, the
showvalue of the meter is
invariable, there isonly small
current, and the pre-flowtime
is variable.
a. The connecting cable matching socket
CON11 oncontrol panel PK-31-A0 with
socket CON2 on control PCB PK-05-A4
is in loose connection.
b. Some part oncontrol panel PK-31-A0 is
damaged.
a. Check.
b. Check if chipU5, audion Q3/Q4 or
potentiometer VR7 on control
panel PK-31-A0 is damaged.
22. When the pulse conversion
switch is at no-pulse state, in
ARC/TIG mode, the welding
current is invariable, and there
is only maximum current.
a. The diodeD24 on control panel
PK-31-A0 is damaged. a. Check and replace it if necessary.

22. When the pulse conversion
switch is at no-pulse state, in
ARC/TIG mode, the welding
current is invariable, and there
is only maximum current.
a. The diodeD24 on control panel
PK-31-A0 is damaged. a. Check and replace it if necessary.
23. Turn on the machine, the
indicator of protectionstatus is
on because the voltage is too
low.
a. The input voltage is too low or is
unstable.
b. The thermal switch matching socket
CON14 on control panel PK-31-A0 is
damaged.
c. The connecting cable matching socket
CON15 oncontrol panel PK-31-A0 isin
loose connection.
d. The resistorR51/R44 or chip U6 on
control panel PK-31-A0 is damaged.
a. Check.
b. Check.
c. Check.
d. Check. Method: properly reduce
the value of resistor R44.
24. The tungsten is badly
burned out in AC mode. a. The value of AC clean width on the panel is adjusted too big. a. Adjust the clean width smaller.
25. The manual control is
normal, but the pedal control
goes wrong.
a. The connecting cable matching socket
CON4 on control panel PK-31-A0is in
loose connection.
b. Some part oncontrol panel PK-31-A0 is
damaged.
a. Check.
b. Check if diode D23, zener diode
Z5, resistorR32/R35/R46 or
inductor L3/L4 on control panel
PK-31-A0 is damaged.