Canon D78-5132, Service Manual

Page: 63 / 134

2. ELECTRICAL ADJUSTMENTS
[Adjustment condition]
• Input signal
Video signal: 1.0Vp-p/75
Ω
terminated, 16 steps gray scale (Composite
video signal)
Component Video signal: 0.7Vp-p/75
Ω
terminated, 16 steps gray scale (Component
video signal with 480i, 480p, 575p, 720p, 1035i or 1080i
format)
Computer signal: 0.7Vp-p/75
Ω
terminated, 16 steps gray scale pattern (XGA)
• Picture control mode “NORMAL” mode unless otherwise noted.
Note:
* Please refer to “Service Adjustment Menu Operation” for entering to the service mode
and adjusting the service data.
2.1 Output Voltage Adjustment
After replacing the Power Board, PF.C. Board, readjust the Output voltage adjustment
as follows.
1. Connect a digital voltmeter to pins 1 (+) and 3 (-) of K6C.
2. Adjust the voltage by using VR01 as following.
AC Input Reading
230V 380V ±2V
120V 372V ±2V
2.2 Fan Voltage Adjustment
1. Connect a digital voltmeter to test point “TP6602” (+) and chassis ground (-).
2. Enter to the service mode, select item no. “29” and set data value to “1”.
3. Adjust the voltage to be 12.1 ±0.1Vdc by using VR6601.
4. Check that the voltages at test points “ TP6601” (+), “TP6603” (+) and chassis ground
(-) are 13.0 to 13.5Vdc.
5. Select item no. “29” and set data value to “0”.
Part 3: Adjustment
3-7
CAUTION
The each circuit has been made by the fine adjustment at factory. Do
not attempt to adjust the following adjustments except requiring the
readjustments in servicing otherwise it may cause loss of performance
and product safety.
CAUTION Be sure to connect the lamp when taking this adjustment.