Sharp 21FL94 Service Manual - Page 19

ADJUSTMENT ITEM ADJUSTMENT POSITION V08 RF-AGC STEP RANGE 0-127 CONTROL I2C CONTROL PRE-ADJUST REQUIREMENT OPTION SET UP, BUS SET UP CONTENT US10CH HALF COLOR BAR INPUT CONDITION OUTPUT RF INPUT FIELD STRENGTH 53dBµV (FIX) TUNER AGC TERMINAL (TP 201) OR CRT DISPLAY CONFIRMATION (AT SELF ADJUSTMENT MODE) 1. GO TO SERVICE MODE 2. GO TO SERVICE DATA V08, PRESS R/C TO OPEARATE AUTO-AGC KEY AND CONFIRM THE OK DISPLAY ON THE SCREEN. 3. IF APPEAR NG PLS REPEAT STEP 2 AGAIN. ADJUSTMENT PROCEDURE (AT MANUAL ADJUSTMENT MODE) 1. ADJUST THE V08 BUS DATA UNTIL AGC TERMINAL VOLTAGE BE- COME MAXIMUM, THEN DROP 0.1V BELOW MAXIMUM VOLTAGE. 2. CHANGE THE ANTENNA INPUT SIGNAL TO 63-67 dBµV, AND MAKE SURE THERE IS NO NOISE 3. CHANGE THE ANTENNA INPUT SIGNAL TO 90-95 dBµV TO BE SURE THAT THERE IS NO CROSS MODULATION BEAT. ADJUSTMENT ITEM ADJUSTMENT POSITION V11,V12,V13 SCREEN STEP RANGE CONTROL I2C CONTROL PRE-ADJUST REQUIREMENT OPTION SET UP, BUS SET UP CONTENT WINDOW PATTERN OR US4CH LION HEAD INPUT CONDITION 220V OUTPUT CONFIRMATION ON CRT DISPLAY 0-255 ADJUSTMENT PROCEDURE 1) IN SERVICE MODE, SET V04&V11&V12&V13 TO 127; V14&V15 TO 64, GET IN Y-MUTE BY R/C AND SET V19 TO "1", PICTURE APPEAR IN CUT-OFF CONDITION 2) ADJUST THE SCREEN SO THAT CUT-OFF LINE APPEAR IN LOW BRIGHT, THEN JUDGE THAT WHETHER THE CUT-OFF LINE APPEAR IN RED OR GREEN OR BLUE COLOR, IN THIS CONDITION V11=RCUTOFF, V12=G-CUTOFF, V13=B-CUT-OFF, FIX THE DATA OF THE COLOR APPEAR IN CUTOFF LINE AND USE R/C TO ADJUST THE OTHER TWO CUT-OFF DATA SO THAT CUT-OFF LINE COLOR BECOME WHITE. 3) TURN THE SCREEN VR OF FBT SO THAT CUT-OFF LINE JUST DISAPPEAR AND USE R/C TO SET V19 TO "0", NEXT DISABLE THE YMUTE SO THAT PICTURE APPEAR IN NORMAL MODE. 21FL94 19 [VOLTAGE CONFIRMATION] MAX - 0.1V dc HISTORY SYMBOL REVISED CONTENT, OF REVISION 19-1 [VOLTAGE CONFIRMATION] HISTORY SYMBOL REVISED CONTENT, OF REVISION 19-2