Sharp 13L-M100 Service Manual - Page 10

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13L-M100/150

CL13M10/15

14ML10

SERVICE ADJUSTMENT

VCO Adjustment

1. Connect a digital voltmeter between pin (44) of IC201

and ground.

2. Select a good local channel.

3. Enter the service mode and select the service

adjustment "S10".

4. Adjust the data so that digital voltmeter reads 2.2V.

5. Adjustment is completed, remove the voltmeter,

return to "normal" mode.

RF AGC Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service

adjustment "S08".

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 "00" will produce a black

raster.

Screen Adjustment

1. Connect a digital voltmeter between TP852 and

TP853 on the CRT Unit.

Note: These test points may not be provided.

Then connect the voltmeter to both ends of

R852 located near Q852 on the foil side.

2. Receive a good local channel.

3. Enter the service mode and select the service

adjustment "S03" and set the data value to "00" to

set the color level to minimum (Record original data

code under adjustment "S03" before changing). You

may skip this step, if you selected a B/W picture or

monoscope pattern.

4. Select the service adjustment "S19" and adjust the

data value to "01", this turn off the luminance signal

(Y-mute).

5. Select the service adjustment "S04" and adjust data

value to obtain 0.17 volts on the digital voltmeter.

6. Adjust the master screen control until the raster

darkens to the point where raster is barely seen.

7. Adjust the service adjustments "S11" red, "S12" green

and "S13" blue to obtain a good grey scale with

normal whites at low brightness level.

8. Select the service adjustment "S19" and reset data

to "00". Select the service adjustment "S03" and reset

data to obtain normal color level.

9. Remove digital voltmeter, and reset the master screen

control to obtain normal brightness range.

White Balance Adjustment

1. Receive a good local channel.

2. Enter the service mode and select the service

adjustment "S03" and set to "00" (minimum color).

"S03" does not have to be adjusted, if you selected a

B/W picture or monoscope pattern.

3. Alternately adjust the service adjustment data of "S14"

and "S15" until a good grey scale with normal whites

is obtained.

4. Select the service adjustment "S03" and adjust data

to obtain normal color level.

Sub-Picture Adjustment

1. Receive a good local channel.

2. Make sure the customer picture control is set to

maximum.

3. Enter the service mode and select the service

adjustment "S01".

4. Adjust the data value to achieve normal contrast

range.

Sub-Tint Adjustment

1. Receive a good local channel.

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

3. Enter the service mode and select the service

adjustment "S02".

4. Adjust "S02" data value to obtain normal flesh tones.

Sub-Color Adjustment

1. Receive a good local channel.

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

position .

3. Enter the service mode and select the service

adjustment "S03".

4. Adjust "S03" data value to obtain normal color level.