Canon D78-5532, Service Manual, Page: 53 / 119

2.4 Pedestal Adjustment [Component]
1. Receive the 16-step gray scale 1080i component video signal with Computer1
[Component] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TPVIDEOG ” (+) and chassis ground (–).
4. Select item no. “ 203 ” and change data value to adjust the pedestal level and black
level to be the same level.
5. Connect an oscilloscope to test point “ TPVIDEOR ” (+) and chassis ground (–).
6. Select item no. “ 204 ” and change data value to adjust the pedestal level and black
level to be the same level.
7. Connect an oscilloscope to test point “ TPVIDEOB ” (+) and chassis ground (–).
8. Select item no. “ 205 ” and change data value to adjust the pedestal level and black
level to be the same level.
Fig. 3-4
2.5 Gain Adjustment [PC]
1. Receive the 16-step grey scale computer signal with Computer1 [RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TPVIDEOG ” (+) and chassis ground (–).
4. Select item no. “ 7 ” and adjust the amplitude “a” to be minimum by changing the Data
value.
5. Connect an oscilloscope to test point “ TPVIDEOR ” (+) and chassis ground (–).
6. Select item no. “ 8 ” and adjust the amplitude “a” to be minimum by changing the Data
value.
7. Connect an oscilloscope to test point “ TPVIDEOB ” (+) and chassis ground (–).
8. Select item no. “ 9 ” and adjust the amplitude “a” to be minimum by changing the Data
value.
Fig. 3-5
(a)
White Level
P
edestal Lebel
Blac
k Lebel
Part 3: Adjustment
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