Contrast Adjustment; Adjustment Procedure - Panasonic BT-H1350Y Service Manual

6. Disconnect an oscilloscope from @ and connect
an oscilloscope to emitter of Q1313.
Video Generator
A-P.C.board VIDEO
Oscilloscope
Monitor TV
Fig. 6
7. Adjust R1316 (CW Level) and C1308 to set 3.58
MHz sub carrier at the minimum amplitude.
8. Confirm that 3.58 MHz sub carrier portion of the
magenta is less than 100mVp-p as shown in Fig. 7.
CONTRAST ADJUSTMENT (A/D/L-P.C. board)
1. EQUIPMENT TO USED
Oscilloscope
Video Generator
RGB Signal Generator
2. INITIALIZE CONDITION
ას ხ"" -<3___-_-___ MმX.
„სო--აა ს. მა ო»""""""""""""""""ძ""' Мах.
Brigätness Cehitrol! va sms makaak aeedaek hard ren Center
3. ADJUSTMENT PROCEDURE
1. Set the Input Selector Switches to LINE A.
2. Input a Cross Hatch pattern signal to VIDEO input
terminal.
3. Connect an Oscilloscope to emitter of Q1313.
Video Generator
A-P.C. board
01313 00
Monitor TV
Fig. 8
4. Confirm that the A is OV at emitter of 01313.
Fig. 9
5. Disconnect an Oscilloscope from emitter of 01313 and
солпесі ап ОзсШозсоре 10 | ХЕ спа А.
ВТ-Н1350Ү
Less than
т "и 100mVp-p
Fig. 7
9. If the amplitude is more than 100mVp-p repeat the
adjustments described in step 7 through 8.
Monitor TV
Fig. 10
6. Adjust R670 (Sub Contrast) so that the C is 50Vp-p
at Bed deg as shown in Fig. 11.
Fig. 11
7. Set the Input Selector switches to RGB.
8. Input a Cross Hatch pattern signal (fH = 15.75 kHz)
to RGB inputs terminal.
9. Adjust R3393 (RGB Sub Contrast) so that the C is
БОМр-р а! I: shown in Fig. 11.
Note: Be sure to D is 30410Vp-p.
If the D is not 30x 10Vp-p, adjust R3317 (Sub
Brightness).
10. Set the picture to first lightup color (glimmer) by R3317
(Sub Brightness).