Sharp 20BM2 Panduan Servis - Halaman 8

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CONVERGENCE ADJUSTMENT

NO. Adjustment part

Adjusting procedure and conditions

CONVERGENCE

1. Receive the "Crosshatch Pattern" signal.

ADJUSTMENT

2. Using the remote controller, call NORMAL

(To be done

mode.

after the purity

adjustment.)

Static convergence

1. Turn the 4-pole magnet to a proper opening

angle in order to superpose the blue and red

colours.

2. Turn the 6-pole magnet to a proper opening

angle in order to superpose the green colour

over the blue and red colours.

Dynamic convergence

1. Adjust the convergence on the fringes of the

screen in the following steps.

a) Fig. 5-1: Drive the wedge at point "a" and

swing the deflection coil upward.

b) Fig. 5-2: Drive the wedge at points "b" and

"c" and swing the deflection coil

downward.

c) Fig. 5-3: Drive the "c" wedge deeper and

swing the deflection coil rightward.

d) Fig. 5-4: Drive the "b" wedge deeper and

swing the deflection coil leftward.

2. Fix all the wedges on the CRT and apply glass

tape over them.

3. Apply lacquer to the deflection yoke lock screw,

magnet unit (purity, 4-pole, 6-pole magnets)

and magnet unit lock screw.

Finally received the Red-only and Blue-only

signals to make sure there is no other colours

on the screen.

Waveform and others

BGR

Fig. 5-1

RGB

Fig. 5-2

RGB

Fig. 5-3

BGR

Fig. 5-4

Wedge "a"

About

100°

Lacquer

Wedge

"b"

"c"

Fig. 5-5

4-pole magnet

6-pole magnet

CRT neck

20cm

Lacquer

(21")

Purity magnet

40cm

Fig. 5-6

(14")

8-1

CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT

NO. Adjustment part

Adjusting procedure and conditions

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

CRT CUTOFF

with NO VIDEO signal.

ADJUSTMENT

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

C BUS

3. Connect the oscilloscope to Red OUT from

CONTROL)

IC801.(TP851 (14")/TP852 (20"/21"))

Range

Sweep

4. Adjust SCREEN VR, so that the tip of signal

reach 3.0 ±0.1 Vdc.

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

SUB-

Crosshatch pattern with 5 black level windows)

BRIGHTNESS

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

ADJUSTMENT

that the line 1, 2 and 3 have the same darkness

C BUS

wherelse line 4 is slightly brighter than line 1,

CONTROL)

2 and 3 and finally line 5 will be the brighter

than line 4.

WHITE

1. Receive the "WHITE" pattern with BURST sig-

BALANCE

nal.

SERVICE

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

3. Connect the DC miliammeter between TP602

MODE

(-) and TP603 (+).

ADJUSTMENT

4. Check Beam current should be around 1,100 µA

C BUS

(20"&21") (14" around 800 µA).

CONTROL)

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

& DRI-BS data to have a colour temperature

of 12,300°K or 7,500°K (white).

* Note .

6. Receive "WHITE" pattern, WITH BURST signal,

and set BRIGHTNESS Y by generator, to ** 10

cd/m2 (MINOLTA CA-100) by reducing

LUMINATE Y signal.

7. Adjust "CUT-R" & "CUT-G" to get desired colour

temperature. Then go back NORMAL mode

(HIGH BRIGHT**) to check colour temperature.

If out 14" back to (1)

Note: This adjustment must be done after

warming up the unit for 30 minutes

or longer with a beam current over

700

A. (20"&21")

(For 14", the beam current should be

over 500

* Adjust DRI-GC/GW, DR-BC/BW as following

data, after finishing DRI-BS and DRI-GS data

adjustment.

DRI-RW=32 (FIXED), DRI-GW="DRI-

GS"-7*, DRI-BW="DRI-BS"-7*

DRI-RC=25, DRI-BC="DRI-BS",

DRI-GC="DRI-GS"-7*

MAXIMUM

1. Receive the "Monoscope Pattern" signal.

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

BEAM CHECK

3. Connect the DC miliammeter between TP603

(+) and TP602 (–).

(Full Scale: 3 mA Range)

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

(21") 800 ± 100 µA(14") .

Waveform and others

3.0Vdc

: 1 V/Div (DC)

: 5 msec/Div

1 V

Fig. 6

1 2 3 4 5

1, 2 and 3 are in same black level.

Fig. 7

Refer to Page ????.

* 12,300°K

X : 0.272

Y : 0.275

* 18,000°K

X : 0.255

Y : 0.255

(MINOLTA COLOUR ANALYZER

CA-100)

*Note: Above Data can be UP/

DOWN by Volume key.

LOW

HIGH

14"

10 cd/m2

200 cd/m2

20"/21" 10 cd/m2

120 cd/m2

* 12,300°K DRI-GW="DRI-GS"-7

DRI-BW="DRI-BS"-7

* 18,000°K DRI-GC="DRI-GS"

DATA-5

DRI-RC=27

8-2