Deflection Circuit - Mitsubishi Electric 50P-GHS63 Service Manual

[Deflection Circuit]
Adjustment To set the white balance of the picture to optimum.
8. White, Brightness
purpose
Symptom when Incorrect brightness of the white portion of the picture.
incorrectly adjusted
Measuring
DC Voltmeter
Note:
Perform this adjustment more that 5 minutes after energizing.
Instrument
Note:
Perform this adjustment after adjustment 7 (Focus).
Test Point
+
side: (j) pin of Connector DR
1. Supply a Gray Scale signal (No.17).
- side: @pin of Connector DR
2. Set up the TEST 1.1.8 mode.
External Trigger
-----
@
Immediately after Pressing the "TEST" button on the remote hand unit,
Measurement
3mA
press "1", "1", and "8" to activate. the TEST 1.1.8 mode.
Range (£)
Keep pressing the "R/B" button to select the "DAC" adjustment mode.
©
Press the
"A"
button to select the "1 SUB-CONT', "2R-GAIN" and "3B-
Input Signal
VG-814 (No.17)
GAIN".
Gray Scale
@
Set each adjustment data to 0 by
pressing"~"
or
"II>"
button.
®
Press the "R" or "B" button on VG-814 to produce a Green monochrome
Input Terminal Mini-I).SUB 15 pin Input Tenninal
picture.
CD Connect the"+" on the DC Ampere Meter to the
CD
pin of Connector DR
and"-" side to the
0
pin of Connector DR respectively to measure the
current value.
PCB-DEFL {Component side)
Note:
Confirm that the internal resistance of the DC Ampere Meter is 30Q or
.-··
...
§
less and the length of the lead wire is 30 em or less.
·-./;
@)
Adjust the item "1 SUB-CO NT' so that the current value is 71 0 ).I.A.
T502
(" _,." or
"~"
BUTTON)
(jj) After adjustment, press "ENTER" to write the data into memory.
CD
Press the "TEST' button to terminate the TEST 1.1 .8 mode.
ORo:
3. Remove the DC Ampere Meter and press the Rand B buttons on VG-814.
4. Supply a Full White signal (No.15).
5. Activate the TEST 1.1.8 mode to select the "DAC" adjustment mode.
6. Adjust the "2R-GAIN" and "3B-GAIN" so that the screen center is in pure white.
7. Supply a Gray Scale signal (No.17).
8. Re-connect the"+" side on the DC Ampere Meter to the
CD
pin of Connector
DR and"-" side to the
0
pin of Connector DR respectively.
9. Adjust the "1 SUB-CONT' so that the current value is 1450±30
!LA-
1 0. Confirm that the level of the most bottom of 16-Gradation is the same as that
of the 1 level upper (or it may be the condition that the gradation that is 2 level
upper from the most bottom begins lighting). If the level is not equal, adjust the
"0 SUB-BRIGHT".
11. Press "ENTER" on the remote hand unit to write the data into memory.
12. Press the ''TEST" button to terminate the TEST 1.1.8 mode.
,.--
·.
13. Repeat the steps 4 to 12.
..
.._,
14. After adjustment, remove the DC Ampere Meter .
-24-