Eiki LC-XT4E, Руководство по обслуживанию

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Electrical Adjustments
Equipment Digital voltmeter
1 - 1 +6V adjustment
1. Adjust the voltage by using
VR652
on the power board
as following.
Connection Adjustment value
(+) 2 pin of K6D 6.35 ±0.05Vdc
on the Power Board
(–) Chassis GND
1 - 2 +25V adjustment
1. Adjust the voltage by using
the VR in the switching
regulator A902
as following.
Connection Adjustment value
(+) TP7614 25.0 ±0.1Vdc
on the Unit Sub Power
(–) Chassis GND
z
Voltage adjustment
Equipment Digital voltmeter
Input mode Video mode
Input signal Color bar signal (PAL)
Picture mode Normal
1. Check the voltage. If it is not, check the peripheral cir-
cuit of 3DNR and repair it.
Connection Value
(+) TP5103 2.9 ±0.5Vdc
(–) Chassis GND
c
AV 3DNR-PLL lock check
Equipment Oscilloscope
Input mode
Video mode
Input signal 16-step gray scale signal
Picture mode Normal
1. Enter the service mode.
2. Connect an oscilloscope to each test points.
3. Change data values for each test points to;
(a) adjust the amplitude A to below value.
(b) adjust the pedestal level and black level to be the
same level.
Group No. Connection Step Adjustment value
1010 - 0 TP211 (G) (a)
0.7
±0.05V
1010 - 1 TP211 (G) (b)
make the same level
1010 - 2 TP201 (R) (a)
0.7
±0.05V
1010 - 3 TP201 (R) (b)
make the same level
1010 - 4 TP221 (B) (a)
0.7
±0.05V
1010 - 5 TP221 (B) (b)
make the same level
Black Level
Pedestal
Level
A
x
AV video signal adjustment
Equipment Oscilloscope
Input mode
Video mode
Input signal Color bar signal (NTSC)
Picture mode Normal
1. Enter the service mode.
2. Connect an oscilloscope to TP221.
3. Change data value to;
(color) adjust the amplitude A to below value.
(tint) adjust the amplitude B , C and D to the same
width.
Group No. Connection Step Adjustment value
1000 - 25 TP221 (B) (color)
0.45
±0.02V
1000 - 24 TP221 (B) (tint)
make the same level
A
B
C
D
v
AV color and tint adjustment