Board Adjustments, Frequency Free Run Check

4-6. A BOARD ADJUSTMENTS

H. Frequency (Free Run) Check

1.Input a TV mode (RF) with no signal.

2.Connect a frequency counter to base of Q501 (TP-25 H. DRIVE) on the A Board.

3.Check H. Frequency for 15735 ± 200 Hz.

V. Frequency (Free Run) Check

1.Select video 1 with no signal input.

2.Set the conditions for a standard setting.

3.Connect the frequency counter to TP-27 (V OUT) or CN501 pin 6 (V DY+) and ground on the A Board .

4.Check that V. Frequency shows 60 ± 4 Hz.

Drive (SCON)

1.Input a color-bar signal and set the level to 75%.

2.Set in Pro mode + PICTURE MAX.

3.Activate the Service Adjustment Mode.

4.Set GON and BON items. Using 3 and 6 set each to the following values. Leave RON set to Ò1Ó.

			Display	Item
			Display	Data
	Mode Category		Item	Data
	Mode Category		Item

Signal	service	video	rdrv	26
Signal
Type	ntsc
	ntsc
	vchp	00000000 00000000
		00000000 00000000

	R ON:	ON	(1)
	G ON:	OFF	(0)
	B ON:	OFF	(0)

5.Connect an oscilloscope probe to C Board, CN705 pin3 (KR).

6.Select SCON with 1 and 4 .

7.Adjust the value of SCON with 3 and 6 for 92 ± 2Vpp.

92 + 2Vpp

8. Reset GON and BON values to Ò1Ó.
R ON:	ON	(1)
G ON:	ON	(1)
B ON:	ON	(1)

9. Press MUTING then ENTER to save into the memory.

KV-27FS320/32FS120/32FS320/34FS120/36FS120/36FS320/38FS120

Display Position Adjustment (DISP)

1.Input a color-bar signal.

2.Set to Service Adjustment Mode.

3.Select DISP with 1 and 4 .

4.Adjust values of DISP with 3 and 6 to adjust characters to the center.

5.Press MUTING then ENTER to save into the memory.

6.Check to see if the text is displayed on the screen.

Display Item

Mode Category Item Data

service micro disp 48

Signal
Type	ntsc

vchp 00000000 00000000

Sub Bright Adjustment (SBRT)

1.Input a monoscope signal.

2.Activate the Service Adjustment Mode.

3.Set the PICTURE and BRIGHTNESS to minimum.

4.Select the SBRT item with 1 and 4 .

5.Adjust the values of SBRT with 3 and 6 to obtain a faintly visible 20 IRE mark, after that increase +3 steps.

6.Press MUTING then ENTER to save into the memory.

Sub Hue, Sub Color Adjustment (SHUE, SCOL)

1.Input color-bar signal at 75%.

2.Activate the Service Adjustment Mode.

3.Set (PIC) to Max and (COL) to 50%.

4. Connect an oscilloscope probe to C Board, CN705 pin 4 (Blue Out).

5.Select the SHUE and SCOL item with 1 and 4 .

6.While showing the SHUE item, adjust the waveform with 3 and 6 until the second and third bars show the same level

(V2 = V3 < 0.15Vp-p). Set Sub Hue -2 Step.

7.While showing the SCOL item, adjust the waveform with 3 and 6 until the Þrst and fourth bars show the same level

(V1 = V4 < 0.15Vp-p). Set Sub Col + 2 Step.

V1 V2 V3 V4

8. Press MUTING then ENTER to save into the memory.