Canon MultiPASS C755 Service Manual - Page 57

Adjustment, 1 CS LED Lights-on Duration Adjustment

Get Canon MultiPASS C755 PDF manuals and user guides View all Canon MultiPASS C755 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 57 highlights

MultiPASS C755 Chapter 3: Maintenance & Service 3. ADJUSTMENT 3.1 CS LED Lights-on Duration Adjustment a) Overview This adjustment is used to eliminate uneven scanning which can result from variations in light intensity between individual LED's. Performing the adjustment will therefore have an effect on scanned and copied images. The adjustment value is registered in an SRAM IC which has lithium battery back-up and will not be lost even if power is turned off. However, the SRAM data can become damaged, for example by battery depletion. In this case, the machine checks the data's validity the next time power is turned ON. If the data is invalid, the adjustment is made automatically. Because the user is automatically prompted, it is almost never necessary to perform this adjustment during normal use. However, if the SCNT board, Contact sensory ass'y, or lithium battery is replaced, be sure to perform this adjustment. Also, if the color or brightness of scanned or copied images is faulty, performing this adjustment may correct the problem. b) Procedure (1) Check that the operation panel is closed correctly, then perform the adjustment by following the steps described below. Function Data registration # Display TEST MODE by pressing or button TEST MODE Set 2 1 2-1 ADJ LEDTIME Several seconds later TEST MODE Figure 3-2 CS LED Lights-on Duration Adjustment Operation (2) The adjustment procedure is finished when the display reads TEST MODE. 3-6

  • 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
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
3-6
MultiPASS C755
Chapter 3: Maintenance & Service
3. ADJUSTMENT
3.1 CS LED Lights-on Duration Adjustment
a) Overview
This adjustment is used to eliminate uneven scanning which can result from variations in light intensity
between individual LED’s.
Performing the adjustment will therefore have an effect on scanned and
copied images.
The adjustment value is registered in an SRAM IC which has lithium battery back-up and will not be lost
even if power is turned off.
However, the SRAM data can become damaged, for example by battery
depletion.
In this case, the machine checks the data’s validity the next time power is turned ON.
If the
data is invalid, the adjustment is made automatically. Because the user is automatically prompted, it is
almost never necessary to perform this adjustment during normal use.
However, if the SCNT board,
Contact sensory ass’y, or lithium battery is replaced, be sure to perform this adjustment.
Also, if the color
or brightness of scanned or copied images is faulty, performing this adjustment may correct the problem.
b) Procedure
(1) Check that the operation panel is closed correctly, then perform the adjustment by following the steps
described below
.
(2) The adjustment procedure is finished when the display reads
TEST MODE
.
Figure 3-2 CS LED Lights-on Duration Adjustment Operation
Function
Data registration
Several seconds later
#
TEST MODE
TEST MODE
Set
2
1
2-1 ADJ LEDTIME
Display TEST MODE by
pressing
or
button