Panasonic TC-20B10P service manual Horizontal Width and Centering Adjustments

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

2- PREPARATION

2.1- Apply a CROSS HATCH pattern.

2.2- Adjust the controls BRIGHT and CONTRAST until current turns to zero.

3- CONFIRMATION

3.1- Connect the DC voltmeter to cathode of D591 and

	confirm that voltage is lower than level(*)A.
3.2-	Adjust the DC power source to level(*)B and confirm
	that SHUTDOWN is not acting.
3.3-	Adjust the DC power source to level(*)C and confirm
	that SHUTDOWN is not acting.
	LEVELS	14” (V)	20” (V)
	(*)A	21,60	22,30
	(*)B	23,60	24,10
	(*)C	25,60	26,10

HORIZONTAL WIDTH AND CENTERING

ADJUSTMENTS

1- ADJUSTMENT OF HORIZONTAL CENTERING

1.1- Position the control BRIGHT to minimum.

1.2- Tune to PHILIPS standards.

1.3- Select the DAC of HORIZONTAL CENTERING (HC) at CHQ3 Service Mode.

1.4- Adjust the HORIZONTAL CENTERING using the keys VOL(+) OR VOL(-).

2- VERIFICATION OF HORIZONTAL WIDTH

2.1- Verify if horizontal width, is within the specifications below:

VERTICAL HEIGHT AND CENTERING

ADJUSTMENTS

1- ADJUSTMENTS.

1.1- Tune a Philips pattern.

1.2- Select the DAC of VERTICAL CENTERING at CHQ3 Service Mode.

1.3- Adjust the vertical placement pressing the VOL(+) or VOL(_) keys until the image is centered. Suggestion: the center line of CRT should coincide with the centerline of PHILIPS pattern).

1.4- Select the DAC VERTICAL ALTITUDE (V ALT) AT CHQ3 at SERVICE mode.

1.5- Adjust the correct altitude pressing VOL(+) or VOL(_) keys

WHITE BALANCE PRE ADJUSTMENT AND CRT CUT OFF ADJUSTMENT

IMPORTANT: This adjustment should be done after 15 minutes heating time.

1- REQUIRED INSTRUMENTS

1.1- Oscilloscope

2- PREPARATION.

2.1- Connect oscilloscope between TPY1 and ground.

2.2- Apply a PHILIPS pattern.

2.3- Confirm if Picture Menu is “DYNAMIC”

2.4- Confirm if Channel Color is “NORMAL”

2.5- Confirm Colour Temperature in “NORMAL”

2.6- Enter Service Mode at CHQ5.

2.7- Position controls at the following positions:

RHIGH LIGHT(R-DR)……........……….40H B HIGH LIGHT(B-DR)……........………. 4OH

RLOW LIGHT (R-CUT)….….........…… 000H B LOW LIGHT(B-CUT)…………........…000H

GLOW LIGHT(G-CUT)……….......……. 125H SCREEN………………………......……..MINIMUM

3- ADJUSTMENTS

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

3.2- Confirm that the Pedestal level value at pin TPE27 is 2,2±0,1Vp-p.

3.3- Adjust G-CUT to obtain (*A) at TPY1, as figure below:

ENGLISH

DIÂMETRO “A”	MODELO
290 ± 5 mm	20 polegadas
200 ± 5 mm	14 polegadas

(*A) 14” 140±2Vp-p

(*A) 20” 160±2Vp-p

0 V

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

3.5- Adjust the other DACs that correspond to the other two colours (R-CUT,B-CUT) until line turns white.

3.6- Exit to normal mode pressing the key NORMAL at the remote control.

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