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TROUBLESHOOTING AND REPAIR
F-29F-29
LN-25™
TP1
R65
D49
R81
R43
R49
C40
DZ10
Q7
R60
D32
C5
R110
D37
R115
X4
R37
R2
C22
R14
C31
R117
R16
X5
R52
R113
T1
R4
R88
D8
Q10
DZ15
D18
D16
C26
R71
R35
C4
R95
X7
R97
C42
R118
Q3
R101
C35
R58
R74
R98
D22
R27
X2
D25
D44
R103
R9
C17
C9
R114
R75
C43
R59
R53
R77
DZ2
D41
R76
D7
DZ11
R18
R29
D14
D11
R24
D43
R44
D10
R84
R47
D3
R72
R1
D15
Q2
R7
R120
R85
C46
DZ17
R56
R28
R86
C45
R15
R45
R82
R90
DZ14
R48
R109
R54
R64
D40
R12
C1
D12
R83
C47
R57
R108
D1
D51
D36
R25
R13
C18
R21
C19
R119
C27
R61
C8
Q5
Q9
C15
R92
Q4
R3
D28
R22
R51
C11
R19
C3
D54
C44
R17
C7
R67
C48
R50
D13
D52
R80
DZ13
X3
R100
R107
R89
R10
R32
C30
D56
R104
Q1
D46
C13
R96
R106
R116
C29
D6
R99
R36
D2
C12
C41
D24
D47
X1
C37
Q6
R79
C23
D9
D34
D4
R68
R63
R66
DZ4
R46
R33 R62
D48
R26
C36
R41
C32
R23
R112
R11
Q8
D21
D17
D33
C2
R30
R6
D53
X6
D5
R94
R5
C6
D27
D19
R105
C34
C16
R55
R20
R78
R34
DZ3
D55
DZ18
C38
C21
R38
R121
DZ12
DZ1
T2
D29
D42
R111
R91
C14
R70
R102
DZ16
C33
D35
D38
R73
C10
D26
D20
C20
R69
C24
C39
R31
D39
L12253-4
CONTROL
J2
J3
J1
667
621
J4
J14
512
500
691
690
555
Contactor
FIGURE F.16 CONTROL BOARD (L12253-[ ])
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CONTACTOR & CONTACTOR PC BOARD TEST (continued)
1. Check to be sure that plug P14 is connected to the
Control Board and is secure.
2. Apply at least 25vdc but no more than 100vdc to the
LN-25™ from the Electrode cable to the Work
Sensing Lead. Observe the polarity and set the
Polarity Switch accordingly.
3. Check for the applied voltage at Plug J1 pins 1 and
3 (leads 667+ and 621-). See Figure F.16.
4. With the Trigger closed and a normally operating
contactor connectedthe voltag measured at Pins 1
and 9 of J14 should be approximately 1.0VDC. If
not, the Control Board may be defective.