Panasonic TC-20B10P service manual CUT OFF PRE Adjustments, Calibration of Video if

Service Adjustments and Calibrations TC-14B10P / TC-20B10P

2.7- Apply a PHILIPS pattern.

2.8- Adjust BRIGHT, SUB BR, in CHQ5, SCREEN to obtain normal image.

2.9- Check if horizontal width is normal

2.10- Select SUB BR in CHQ5 and check if BRIGHT is controlled by varying SUB BR in CHQ5.

2.11- Select HORIZONTAL CENTERING (HC) in CHQ3 (Service Mode) and adjust convergence.

2.12- Select VERTICAL CENTERING (VC) in CHQ3 (Service Mode) and adjust convergence.

3- PRÉ AJUSTE DO AGC RF.

3.1- Apply a PHILIPS pattern.

3.2- Adjust the signal level to 65±2bB (75Ω open).

3.3- Select RF AGC in CHQ4 Service Mode and increase it pressing VOL(+). Verify if “snow” appear when the RF AGC register is increased. Then decrease it slowly by using VOL(_) until the “snow” has disappeared.

CUT OFF - PRE ADJUSTMENTS

1- REQUIRED EQUIPMENTS.

1.1- Oscilloscope.

1.2- Connect oscilloscope between TPY1 (Q352-C) and ground.

1.3- Position controls/adjust following the information

below:
R HIGH LIGHT (R-DR)	40H
B HIGH LIGHT (B-DR)	40H
R LOW LIGHT (R-CUT)	000H
B LOW LIGHT (B-CUT)	000H
G LOW LIGHT (G-CUT)	125H
COR	MINIMUM
CONTRASTE	MAXIMUM
SCREEN	MINIMUM

1.4- Apply a PHILIPS pattern.

1.5- Press “5” at the remote control to obtain a simple horizontal line

1.6- Adjust G-CUT to obtain a reading at TPY1, as figure below.(*)

(*) 20 inch 160 ± 2Vo-p

(*) 14 inch 140 ± 2Vo-p

0V

1.7- Adjust SCREEN until a first line appears at the screen, and don’t change it after this.

1.8- Adjust the other DAC’s that match the other two colours (R-CUT, B-CUT) until it turns the line white.

1.9- Exit to Normal Mode pressing NORMAL at the remote control.

1- SOUND INSPECTION

1.1- Verify if sound varies correctly pressing VOL(+) or VOL(_).

1.2- Verify if tone is adjusted using the “TONE”control at the “SOUND” Menu.

2- INSPECTION OF COLOUR CONTROL

2.1- Apply a PHILIPS pattern.

2.2- Select Pic. Menu DYNAMIC, and adjust NORMAL IMAGE using the remote control.

2.3- To access the function NORMAL IMAGE press MAIN MENU and next press the “<“ or “>” navigation keys to select the function IMAGE.

Press the<“ “ navigation keys to enter menu. Press the ”N” key at the remote control to activate function

NORMAL IMAGE.

2.4- Verify if saturation is normal and sufficcient.

2.5- Confirm the variation of the colour phase acting at the TINT control, receiving NTSC pattern.

3- OTHER INSPECTIONS.

3.1- Tune the VHF, UHF and CATV channels and check if there is good reception.

3.2- Press the key TV/VIDEO and verify ON SCREEN.

3.3- Return to the TV Mode.

CALIBRATION OF VIDEO IF

1- REQUIRED EQUIPMENT

1.1- Monitor

1.2- VIF generator

1.3- VIF detector

1.4- Power source of 9,0 ±0,1V and 4,0 ±0,1V 1.5- Bias box to AGC

1.6- Resistor Jumper of 1KΩ CONEXIONS

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