LC-M3700 (serv.man7). (7) Adjustment procedures - Sharp TV Service Manual (repair manual)

[How to enter the process adjustment mode]

<Main process>
1) Using the remote control or main body switch, put the unit in a standby state.  (The power LED is "Red".)
2) Press the "MAIN POWER" button to turn off the power.
3) Press the "POWER" button on the display section to turn off the power.
4) While pressing the "INPUT" and "MENU" keys on the main body side together, press the "MAIN POWER"

switch on the main body to turn on the power.
If a display such as "1/16" and "N358" is shown in blue characters on one line at the top of the screen several
seconds later, the process adjustment mode has been entered.  Pressing any of the cursor UP/DOWN/LEFT/
RIGHT keys will display the process adjustment items.
If you fail to enter the process adjustment mode (the same display as in the case of normal startup appears),
repeat the above-described steps again.

<Monitor process>
1) Using the remote control or main body switch, put the unit in a standby state.  (The power LED is "Red".)
2) Press the "MAIN POWER" button to turn off the power.
3) Press the "POWER" button on the display section to turn off the power.
4) While pressing the "INPUT" and "UP" keys on the main body side together, press the "MAIN POWER" switch

on the main body to turn on the power.
It is also possible to enter the monitor process mode by setting "KOUTEI CHANGR" on the last line of the first
page of the main process mode to MONITOR with the VOL +/- key and pressing the ENTER key.  To switch
from the monitor process mode to the main process mode, set "KOUTEI CHANGR" on the last line of the first
page of the monitor process mode to MAIN and press the ENTER key.

Caution:Take great care not to allow the customer to know the method of entering the process

adjustment mode described below.  If the setting in the process adjustment mode is changed
indiscriminately, an unrecoverable error may be caused.

[Key operation]
MENU: Used to move up by one line.
RETURN: Used to move down by one line.
VOL +/-: Used to change the setting on the selected line (+1/-1).
Cursor UP/DOWN: Used to scroll by page (Previous/Next).
Cursor RIGHT/LEFT: Used to change the setting on the selected line (+10/-10).
INPUT: Used to change the input (INPUT1

→

 INPUT2

→

  INPUT3

→

 PC).

ENTER: Used to execute the function.

[Reading of process adjustment values]
The adjustment values set at the factory before shipping are stored on the main PWB of this unit (not covering all
the items in the process menu).  In repairing the unit, if the problem is solved only by replacing the PCI/F unit, you
can read the stored adjustment values and therefore all you do is to adjust some items only.

•

How to read the stored ex-factory adjustment values (backup data)
Select (page7) EEPROM RECOVER, set it from "OFF" to "ON" with the "VOL" key, and then press the "ENTER"
key.  If "error" is displayed, you have failed to read the data and therefore have to adjust all the items.

•

Adjustments required after reading the stored ex-factory adjustment values (when the data is read successfully)

Ë

+Badj3.3V reference voltage adjustment

Ë

+Badj1.8V important component operating voltage adjustment (It is adjusted automatically by pressing the
"ENTER" key after 3.3V adjustment above.)

Ë

N358 WB adjusting white balance adjustment (Video)

Ë

PAL WB adjusting white balance adjustment (Video)

Ë

COMP 15K WB adjusting white balance adjustment (Component 525i)

Ë

COMP 33K WB adjusting white balance adjustment (Component hi-vision)

[Actual adjustment]
Before entering the process adjustment mode, reset all the user settings.
(Execute Menu [Video Adjustment]-|[Reset].)

1. Analog adjustment
1) Voltage adjustment

Adjustment item

Adjustment condition

Adjusting method

1

3.3V adjustment

page2
+BAdj3.3V
(NTSC color bar received)

2

1.8V adjustment

page2
+BAdj1.8V

2) PAL signal adjustment

Adjustment item

Adjustment condition

Adjusting method

1

Signal input

1

Setting

2

MAIN PAL Y

Page3

gain adjustment

PAL Y GAIN

Connect a voltmeter to TP4 of the PC I/F unit and
adjust the voltage to 3.30±0.01V.

If 3.3V adjustment is completed, pressing the ENTER
key on the remote control with the "+BADJ1.8V" line
selected will adjust the voltage automatically.  If
"ERR" appears, adjust the voltage to 1.90V using pin
(1) of CN9 of the PC I/F unit.

Using a signal generator, feed PAL split field color
bars (containing 100% white and having color
saturation of 75%) to the video signal input terminal
of INPUT1 or INPUT2.

Set the color system is to PAL by selecting a PAL
source.

Using pin (1) of P802, adjust the gain to
0.70±0.025Vp-p.

TP4

TP4

TP4

P802

P802

P802

1

1

12

12

12

3) SECAM signal adjustment

Adjustment item

Adjustment condition

Adjusting method

Signal input

Using a signal generator, feed SECAM split field
color bars (containing 100% white and having color
saturation of 75%) to the video signal input terminal
of INPUT1 or INPUT2.

1

Setting

Set the color system to SECAM.

2

Page4
SECAM Y GAIN

SECAM Y gain
adjustment

Using pin (1) of P802, adjust the gain to
0.70±0.025Vp-p.

3

Page4
SECAM CB GAIN

SECAM color density
adjustment

Using pin (3) of P802, make adjustment so that the
interval indicated in the figure below becomes
0.53±0.025Vp-p.

0.53Vp-p

2) PAL signal adjustment

3

MAIN PAL color

PAL CB GAIN

density adjustment

Using pin (3) of P802, make adjustment so that the
interval indicated in the figure below becomes
0.53±0.025Vp-p.

0.53Vp-p

4

MAIN PAL Cr level adjustment

Using pin (5) of P802, make adjustment so that the
interval indicated in the figure below becomes
0.53±0.025Vp-p.

0.53Vp-p

5

MAIN CONTRAST

CONTRAST 15k

adjustment

Using the IC8805 output (TP8805), adjust the
contrast to 0.90±0.025Vp-p above the pedestal.

TP8805

TP8805

Adjustment item

Adjustment condition

Adjusting method