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[Video Circuit]
Adjustment purpose
To set beam current to its optimum value.
10. Sub Cont
Symptom when
Excessive or insufficient contrast.
incorrectly adjusted
DC milliammeter
* This adjustment must follow adjustment 7 (CRT Cut Off, White).
instrumen
* Preheat the set for two minutes or more.
Test point
2
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4. Supply an RF signal (gray scale 87.5% MOD).
EXT trigger
=
a
2. Press the "MENU" button on a remote hand unit.
3. Press the buttons "2", "3", "5" and "7" in that order.
3mA
(The screen will change to the circuit adjustment mode.)
RF signal
4. Set the function to "VCH". "AUDIO" button)
Input signal
(gray scale 87.5%MOD)
5. Select item "67 SCT". ("VIDEO" button)
6. Measure the current at pins @ and © of connector MS (Plus lead to pin ©).
7. Set the data so the DC milliammeter reads 850+ 25nA.
(CADJUST" button)
8. Write the data into memory. (Press "ENTER")
9. Terminate the circuit adjustment mode. (Press "MENU" twice)
Note: Adjustment 11 (Black Level) must be performed immediately after this
adjustment.
PCB-MAIN (COMPONENT SIDE)
[Video Circuit]
Adjustment purpose
Picture luminance.
11. Black Level
Symptom when
Excessive or insufficient brightness.
incorrectly adjusted
Measuring
* This adjustment must follow adjustment 10 (Sub Cont).
instrument
1. Supply a VIDEO signal (monoscope).
Test point
2. Press the "MENU" button on a remote hand unit.
2
3. Press the buttons "2", "3", "65" and "7" in that order.
EXT trigger
a
(The screen will change to the circuit adjustment mode.)
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4. Set the function to "VCH". ("AUDIO" button)
;
VIDEO signal
5. Select item "23 SBR". ("VIDEO" button)
Input signal
(monoscope)
6. Observe the gradation pattern inside a monoscope signal, and set the data so
input terminal | VIDEO IN terminal
that both levels, at the 10% and 0% areas of the gradation pattern, are the
same (black level 8%). ("ADJUST" button)
7. Write the data into memory. (Press "ENTER")
8. Terminate the circuit adjustment mode. (Press "MENU" twice)
60%
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