Sharp 21C-FX1G Servis Kılavuzu - Sayfa 10

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1. Specifications

CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT

No. Adjusting point

Adjusting procedure/conditions

CRT CUTOFF

1. Switch TV to VIDEO mode,BLUE BACK OFF, with-

ADJUSTMENT

out VIDEO signal.

2. Press R/C to set Picture Normal condition.

3. First off the screen by adjust screen variable re-

sistor.

*4. Next, check AKB circuit function by slowly increase

screen variable resistor until colour raster suddenly

On and Off (AKB start function).

5. Then continue adjust unfil retrace line appear.

6. Finally, slowly decrease the screen variablu resis-

tor unfil screen retrace line (Not Raster) Cut Off.

*NOTE : Must comfirm the AKB function in set before

continue the next adjustment.

REMARK:

1. Before CRT Cutoff adjustment, SUB-BRIGHT, DRI-

RS/RC/RW, DRI-GS/GC/GW, DRI-BS/BC/BW,

CUT-R and CUT-G must be in initial data.

2. CRT Cutoff adjustment must be done inside a dark

room.

SUB-BRIGHT-

1. Call " SUB-BRI" in service mode. (Receive Cross-

NESS

hatch pattern with 5 black level windows)

ADJUSMENT

2. Adjust the " SUB BRIGHT " bus data in order that

(I2C BUS

the line 1 and 2 have the same darkness whereas

CONTROL)

line 3 is one step (data) brighter than line 2 .Fi-

nally data minus 1 to make line 1,2 and 3 are in

same level darkness.

WHITE BAL-

1. Receive the "WHITE" pattern with BURST SIGNAL.

ANCE SERV-

2. Press R/C to set Picture NORMAL condition.

ICE MODE

3. Connect the DC miliammeter between the TP602

ADJ. (I2C BUS

(-) TP603 (+).

4. Check Beam current should be around 1,350 µA.

CONTROL)

5. Set it to service mode and adjust the " DRI-GS"

(White Point-G), "DRI-BS" (White Point-B) data

to have a colour temperature of 12,300°K or

18000ºK (white).

* Note .

6. Receive "White" pattern, with BURST signal, and

set Brightness Y by generator, to **10cd/m

(Minolta CA-100) by reducing Luminate Y signal.

7. Adjust "CUT-R" & "CUT-G" to get 12,300°K or

18000ºK . Then go back normal mode (High

Bright**) to check colour temperature. If out of

range, back to 5.

Waveform and others

*Alternative Procedure:

(1). Step (1),(2),(3) and (4) are same

as beside procedure.

(2). Then continue adjust until re-

trace appear and make sure the

colour appear wheather red,

green or blue

(3). Connect the oscilloscope to re-

lated test points as below which

is based on colour appear at (2)

Colour Appear

Test Point

RED

TP 851

GREEN

TP 852

BLUE

TP 853

(4). Then adjust SCREEN VR until

the

tip

signal

3.2Vdc±0.1Vdc

3.2

0.1 Vdc

20mS

1 2 3 4 5

line 3 is one step (data) brighter

than line 2.

1 2 3 4 5

Refer to Page 7-2.

*18000°K

X: 0.255

Y: 0.255

*12300°K

X: 0.272

Y: 0.275

(MINOLTA COLOUR ANALYZER

CA-100)

*Note: Above Data can be UP/

DOWN by Volume key.

Low

High

**Note:

10cd/m

180cd/m

10-1

Note: This adjustment must be done after

warming up the unit for 30 minutes or

longer with a beam current over 700

* ADJUST DRI-GC/GW, DRI-BC/BW AS FOLLOW-

ING DATA, AFTER FINISHING DRI-GS AND DRI-

BS. *(12300ºK)

DRI-GC/GW DATA = "DRI-GS"-7 DATA

DRI-RC = 25; DRI-BC = DRI-BS; DRI-RW = 32

DRI-BW DATA = "DRI-BS"-7 DATA

Maximum

1. Receive the "Monoscope Pattern" signal.

beam check

2. Press R/C to set Picture NORMAL condition.

3. Connect the DC miliammeter between TP603 (+)

and TP602 (–).

(Full Scale: 3 mA Range)

4. Beam current must be within 1,350 ± 100 µA.

reach

HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT

No. Adjusting point

Adjusting procedure/conditions

V-LINEARITY

1. Receive Monoscope Pattern Signal.

(I2C BUS

2. Call the "V-LIN" mode.

CONTROL)

3. Increase or decrease "V-LIN" by Volume key till

the horizontal line in the center of monoscope is

just at the position where the blanking starts.

V-CENTER

1. Call the "V-CENT" mode.

(I2C BUS

2. Increase or decrease "V-CENT" by Volume key

CONTROL)

till the picture is centered.

V - AMP (I2C

1. Call the "V-AMP" mode.

BUS CON-

2. Increase or decrease "V - AMP" by Volume key

TROL)

to set overscan of 8.5% typical.

Adjustment Spec 8.5% range +1% -1%.

H-CENTER

1. Call the "H-CENT" mode.

(I2C BUS

2. Increase or decrease "H-CENT" by Volume key

CONTROL)

to center the picture horizontal.

S-CORREC-

24(FIX DATA)

TION

*18000ºK

DRI-GW = "DRI-GS" DATA -7

A).

DRI-BW = "DRI-BS" DATA -7

DRI-GC = "DRI-GS" DATA-5

DRI-RC = 27

Waveform and others

10-2