ciekawostka - że przerwa.
AKB najczęściej pokazuje jak jest przekroczony prąd katod np. przywarcie katody do S1 albo przesadny kontrast i świecenie nadmierne kineskopu :?
PS.
Drobna wzmianka o AKB z projektora SONY(akurat miałem pod ręka)
If the AKB, or "automatic cathode balance" circuit is working, or was not disabled, those other pots (they are called "screen" or "G2" adjusts) shouldn't be super critical. For instance, if you nudge the green one up a little, you should see the projector "try" to turn it back down. Similarly if you turn it down, the projector tries to correct this. If changing them made a huge difference, it's possible that the AKB was disabled by a previous user. The reason someone might have done this is to get rid of the AKB line at the very top of the screen (usually off the screen and on the wall) which some people find annoying. Do you have a voltmeter? If so, there are voltages you can measure on the small CFB board under the fold down (fold up if it's on the floor) boards to set the G2's. Set the unit into Service mode, press the Page key and make sure the unit is set to 6500 color temp, press the Bias key, press the left and right arrow keys simnultaneously until the message "Factoryu Preset Data?" is displayed, and press the up key for yes. Then measure the voltage between chassis and pin 2 of CFB, and adjust the blue G2 for 4 volts. Do the same with green and red at pin 3 and pin 4."