akira 21WHP3/BN, Руководство по обслуживанию

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Model No: 21WHS3-Bn
Version 1.0
Item
TV system adapting & AV in/output
inspection
AKPH01 chassis
Measuring
Equipment SG (with NTSC3.58). User remote controller
Dual trace oscilloscope
Preparation
before Adj.
Input TV and AV signal
Inspection procedure
1, Input the TV signal which system is designated in technical specification
2, Switch TV system to the set by pressing SYS key on user remote controller
according to the TV system in SG. The picture and sound must be normal.
3, Press TV/AV key, to select AV input. The picture and sound must be normal
4, AV output inspection. Load a 75
Ω
resistor to VIDEO output terminal,1Vp-p
video output signal that is from TV signal should be observed on the
oscilloscope. Load a 10K resistor to AUDIO output terminal, 0.7Vp-p audio
output signal that is from TV should be observed on the oscilloscope.
Item Focus adjustment
AKPH01 chassis
Measuring
Equipment
SG
Preparation
before Adj.
Brightness, contrast and color should be set in standard
Adjustment procedure
1, Receive the cross-hatch pattern signal
2, Turn the focus adjusting VR watching the screen and adjust the vertical line of
mark to make the most thin. Then the focus adj. VR is set as close low voltage
side as possible.
Stop the focus adj. VR at the point that focus is a bit worse at once, turn back to the
left and then turn back to the right a little again.