MITSUI MTV-DV05, Руководство по обслуживанию

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SERVICE MANUAL
9
4. Focus Adjustment
Caution: Dangerously high voltages are present inside the TV. Extreme caution should be
exercised when working on the TV with the back removed.
4.1 After removing the back cover, look for the FBT on the main PCB. There should be a FCB on the FBT.
4.2 Power on the TV and preheat it for 15 min.
4.3 Receive a normal TV signal. Rotate knob of the FCB until you get a sharp picture.
Before Adjusting After Adjusting
5. Safety Inspection
5.1 Inspection for insulation and voltage-resistant
Perform safety test for all naked metal of the TV. Supply high voltage of 3000V AC, 50Hz (limit current of
10mA) between all naked metal and cold ground. Test every point for 3 seconds. and ensure no arcing
and sparking.
5.2 Requirements for insulation resistance
Measure resistance between naked metal of the TV and feed end of the power cord to be infinity with a
DC-500 high resistance meter and insulation resistance between the naked metal and degaussing coil
to be over 20M
Ω
.
6. DESIGN/SERVICE mode
6.1 To enter the DESIGN/USER SERVICE (S) mode
Set the volume to 0. Then press the MUTE key on the remote control and on the TV at the same time
for over 2 seconds. In the S mode, press the POWER key to quit the S mode.
6.2 Adjustments and bus data
Table 1 Bus Data
Item Symbol Description Bus Data
MENU.00
V.POSITION VERTICAL POSITION 40
H.PHASE HORIZONTAL PHASE 15
V.SIZE VERTICAL SIZE 60
V.SC VERTICAL S-CORRECTION 18
V.LINE VERTICAL LINE 19
V.SIZE CMP VERTICAL SIZE COMPENSATION 7
MENU.01
SUB.BIAS SUB-BRIGHT 63
SUB.CONT SUB-CONTRAST 31
V.KILL VERTICAL KILL 0
(continued)