Sharp 13VT-K100 Service Manual download pdf (Page 15)

13VT-K100/150

13VT-CK10

SERVICE ADJUSTMENT

VCO Adjustment

1. Connect a digital voltmeter between pin (44) of IC401

and ground.

2. Select a good local channel.

3. Enter the service mode. select adjustment item PIF-

VCO and data value "40".

4. Adjust the VCO coil L202 so that the digital voltmeter

reads 2.5 volts.

5. Adjustment is complete, remove the voltmeter, return

to "normal" mode.

RF AGC Adjustment

1. Have unit receive a good local channel.

2. Enter the service mode and select service adjustment

item "RF-AGC".

3. Set the data value to point where no noise or beat

appears.

4. Select another channel to confirm that no noise or

beat appears.

Note 1: You will have to come out of the service

mode to select another channel.

Note 2: Setting the data to "0" will produce a black

raster.

Screen Adjustment

1. Select a good local channel.

2. Enter the service mode and select service adjustment

item "COLOR" and set the data value to "0" to set

the color level to minimum. You may skip this step,

if you selected a B/W picture or monoscope pattern.

3. Select service adjustment item "Y-MUTE" and adjust

the data value to "1", this turns off the luminance

signal (Y-mute).

4. Select service adjustment item "BRIGHT" and set

the value to "32".

5. Adjust the master screen cotrol untill raster darkens

to the point where raster is barely seen.

6. Adjust service adjustments item "R-CUT OFF" red

"G-CUT OFF" green and "B-CUT OFF" blue to obtain

a good grey scale with normal whites at low

brightness level.

7. Select service adjustment item "MUTE" and reset

data to "0". Select service adjustment item "COLOR"

and reset data to obtain normal color level.

White Balance Adjustment

1. Have unit receive a good local channel.

2. Enter the service mode. Select service adjustment

item "COLOR" and set to "0" (minimum color).

"COLOR" does not have to be adjusted if you

selected a B/W picture or monoscope pattern.

3. Alternately adjust service adjustment data of "G

GAIN" and "B GAIN" untill a good grey scale with

normal whites is obtained.

4. Select service adjustment item "COLOR" and adjust

data to obtain normal color level.

Picture Adjustment

1. Have unit receive a good local channel.

2. Make sure the customer picture control is set to

maximum.

3. Enter the service mode and select service

adjustment item "PICTURE".

4. Adjust the data value to achieve normal contrast

range.

Tint Adjustment

1. Have unit receive a good local channel.

2. Set customer tint control to center of it’s range.

3. Enter the service mode and select service

adjustment item "TINT".

4. Adjust "TINT" data value to obtain normal flesh tones.

Color Adjustment

1. Have unit receive a good local channel.

2. Make sure the customer color control is set to center

position .

3. Enter the service mode and select service

adjustment item "COLOR".

4. Adjust "COLOR" data value to obtain normal color

level.

Brightness Adjustment

1. Have unit receive a good local channel.

2. Make sure the customer brightness control is set to

center position.

3. Enter the service mode and select service

adjustment item "BRIGHT".

4. Adjust "BRIGHT" data value to obtain normal

brightness level.

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Sharp 13VT-K100 Service Manual Page 15

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