Canon MultiPASS C755 Service Manual - Page 122

c Line signal reception test, c-1 Test Menu 1, Numeric button, Detection level dBm

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 122 highlights

MultiPASS C755 Chapter 3: Maintenance & Service c) Line signal reception test The line detect test menu is selected by pressing the 9 button from the faculty test menu. This test checks the operation of the NCU signal sensor and frequency counter. In Menu 1, the CI, status can be detected and in Menu 2 the frequency can be detected at changing detection levels. In this way, you can check if the NCU board is correctly detecting signals. c-1) Test Menu 1 Test Menu 1 is selected by pressing the 1 button from the Line Detect menu. When CI, and CNG are detected from the modular jack, the display changes from OFF to ON and the received frequency is displayed. c-2) Test Menu 2 Test Menu 2 is selected by pressing the 2 button from the Line Detect menu. When a tonal frequency is detected from the modular jack, the display changes from OFF to ON and the received frequency is displayed. The frequency detection level can be set with the numeric buttons. Numeric button 0 1 2 3 4 5 6 7 8 9 Detection level (dBm) -26 -30 -32 -35 -38 -41 -43 -45 -47 -51 c-3) Test Menu 3 Test Menu 3 is selected by pressing the 3 button from the Line Detect menu. When CNG is detected from the modular jack, the display changes from OFF to ON. c-4) Test Menu 4 This item is not used. Do not select it. 3-71

  • 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
3-71
MultiPASS C755
Chapter 3: Maintenance & Service
c) Line signal reception test
The line detect test menu is selected by pressing the
9
button from the faculty test menu.
This test
checks the operation of the NCU signal sensor and frequency counter.
In Menu 1, the CI, status can be
detected and in Menu 2 the frequency can be detected at changing detection levels.
In this way, you can
check if the NCU board is correctly detecting signals.
c-1) Test Menu 1
Test Menu 1 is selected by pressing the
1
button from the Line Detect menu.
When CI,
and CNG are
detected from the modular jack, the display changes from OFF to ON and the received frequency is
displayed.
c-2) Test Menu 2
Test Menu 2 is selected by pressing the
2
button from the Line Detect menu.
When a tonal frequency
is detected from the modular jack, the display changes from OFF to ON and the received frequency is
displayed.
The frequency detection level can be set with the numeric buttons.
Numeric button
Detection level (dBm)
0
–26
1
–30
2
–32
3
–35
4
–38
5
–41
6
–43
7
–45
8
–47
9
–51
c-3) Test Menu 3
Test Menu 3 is selected by pressing the
3
button from the Line Detect menu.
When CNG is detected
from the modular jack, the display changes from OFF to ON.
c-4) Test Menu 4
This item is not used.
Do not select it.