Oki ML490 Maintenance Manual - Page 104

Troubleshooting flow chart

Get Oki ML490 PDF manuals and user guides View all Oki ML490 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 104 highlights

6.5 Troubleshooting flow chart 1 Power is not supplied. Is the AC cable connected correctly? Yes No Connect the AC cable correctly. Is fuse F1 on the transformer assy/or F1 on the Power Supply Board blown? No Yes Replace fuse (with same type and rating). Remedied? No Yes End Does DC + 50V out? No Yes Remove Print Head. (Turn power off, then on.) Remedied? No Yes End Replace carriage cable or ribbon feed mechanism. Remedied? No Yes End Replace Control Board Remove CN3 on Power Supply Board Measure for any short circuits between + 5V, + 50V, + 12V, - 8V, 0V in CN2 of Control Board. Any short circuit? No Yes 42114101 Rev.1 104 /

  • 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
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
42114101
Rev.1
104 /
6.5
Troubleshooting flow chart
1
Power is not supplied.
Is the AC cable connected correctly?
Yes
No
Connect the AC cable correctly.
Is fuse F1 on the transformer assy/or F1 on the Power Supply Board blown?
No
Yes
Replace fuse (with same type and rating).
Remedied?
No
Yes
End
Does DC + 50V out?
No
Yes
Remove Print Head. (Turn power off, then on.)
Remedied?
No
Yes
End
Replace carriage cable or ribbon feed mechanism.
Remedied?
No
Yes
End
Replace Control Board
Remove CN3 on Power Supply Board
Measure for any short circuits between + 5V, + 50V, + 12V, - 8V, 0V in CN2 of Control
Board.
Any short circuit?
No
Yes