Samsung KCT52A Training Manual page 87

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3.3.4 FOCUS Adjustment
1. Input a black and white signal.
2. Adjust the tuning control for the clearest picture.
3. Adjust the FOCUS control for well defined scanning
lines in the center area of the screen.
3.3.5 B+ Line Check
There are 3 power modes:
1. "A": When AC power supply is connected; Stand-By"
mode.
2. "B": When " Set Power-ON" button is pressed.
I "C": Operated by FBT.
Each voltage is marked on its lead-in wire.
TOC
SAMSUNG GROUP
SAMSUNG GROUP
3-3-6 F/S (Fail Safe) Circuit Check
1. The failsafe circuit check is the final step after servic-
ing.
· Turn the power switch on and adjust the screen for
"Normal".
3. Temporarily short Pin R and Pin X an the chassis
(RX05, RX04). Sound and picture will disappear.
4. The TV should remain in this state. This shows that the
failsafe circuit is working properly.
5. To restore picture and sound, temporarily turn off the
AC power supply. After about 30 seconds, switch
power 6N.
KCT52A Chassis
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