ROADSTAR CTV-5512 Service Manual

R

- CTV-5512

- CTV-5512

CTV-5512

Service Manual

Service Manual

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THE METHOD OF ADjUSTMENTS

* SCREEN VOLUME ADJUSTMENT

(1) Fix the video output DRIVER VOLUME VROO4,605 and the video output BIAS VOLUME

VR601,602,603 to the VOLUME center.
(2) Adjust the BRIGHTNESS and the CONTRAST VOLUME to minimum.
(3) Change the SERVICE SWITCH SW~ to the SERVICE JX>sition.
(4) Becoming the CROSSW A Y A LINE, adjust the SCREEN VOLUME.

* WHITE BALANCE ADjUSTMENT

(1) Fix the SERVICE SWITCH to the SERVICE position.
(2) The CROSSW A Y A LINE adjust the BIAS VOLUME VR601,602,603 the white.
(3) Fix the SERVICE SWITCH to the NORMAL JX>sition.
(4) Attach the LUMINANCE METER to the contrast to I;naximum.
(5) Adjust the BRIGHTNESS and the CONTRAST to minimum.
(6) The LED of the LUMINANCE METER adjust the video output BIAS VOLUME to the

green coloro
(7) Adjust the brightness and the contrast to minimum.
(8) The LED of the luminance meter adjust the video output bias volume to the green colar.
(9) Adjust again to a (5),(6),(7),(8) clauses.

* FOCUS VOLUME ADJUSTMENT

(1) Receive the LION PATTERN.
(2) Adjust the brightness and the CONTRAST VOLUME to maximum.
(3) Adjust the focus volume to clearness.

* ABL ADJUSTMENT (Automatic Brightness Control Limit)

(1) Receive the CROSS HATCH PATTERN.
(2) Adjust the brightness and the CONTRAST VOLUME to maximum.
(3) Connect TP105,100 POINT with the DC VOL TMETER.

(4) The voltage of TP105,106 POINT adjust the SUB BRIGHTNESS VOLUME(VR701) to

0.22:t 0.OO5(V).

* VIF DET. COlI.. ADJUSTMENT

(1) The MEASUREMENT UNIT connect as shown in Figure 13.
(2) Set the VIF ADjUSTMENT MEASUREMENT UNIT from the left (FREQUENCY(MHz) oi

Fìgure 14.)

M~IN PCB rn .

TP103 RF 55G

OSCILLOSCOPE

TP10'4 00 o. 00 -O

TP107 TP188

RF-QUT H-QUT H-IN V-IN

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RGC GND 8: 001uF 001uF

IV-5V 18 5V LDRD1 -"Nr-I

PDUER SUPPLV .

figure 13 The Method oi the Measurement Unit Connection

(3) FREQUENCY(MHz) MARKER POINT adjust the DETECTOR COIL (T104) to

maximum.

3190t1Hz 32 '40MHz

rSSG LDRD2-"Nr-1 f-SCDPE

1K oh.. 11< ohlll

750hlll

3890MHz

Figure 14. The Wave Sha~ oi VIF

t'

* TRAP COIL ADJUSTMENT ~

(2) Set the adjust measurement unit from the !eft (Frequency MHz of Figure 16)

MI=IIN PCB m.

TP1B3 RF SSG

OSCILLOSCOPE

TP1B" <0>0 00 00 .o

TP1B7 TP1BB

o LORO1 -'WY-j 55G

+ -

RF-OUT H-OUT H-IN U-IN

POIJER 5UPPLV

5V5TEI1

Fig 15. The method of the measurement unit connection

(3) Frequency(MHz) marker point adjust the trap coi! (TlO2) to maximum.

Fig 16. The wave shape of trap

* AGC ADJUSTMENT

(1) Receive the UHF Channel 21.(Then,the input level oi the RF must to be 9(}dB-100dB)
(2) The UHF Channel 21 adjust the AGC VR (VR101) to be disappear the Noise.
(3) The input level 100dB check to be saturated by the VHF channel reception.

* V -HEIGHT AD JUSTMENT

(1) Receive the LION PATTERN. (When the LION PATTERN don't exist,use; to the

p A TTERN with coITespondence)
(2) Adjust the V-HEIGHT (VR501) to be identiiied with the OVER SCAN oi the horizonzta1
(3) Adjust the VERTICAL POSITION SWITCH(SW.501) to be identified with the CENTER

POSITION oi the VERTICAL CENTER (Fig 17)

T

90%

l

Resolution: 1000 TV lines ,

Fig. 17I

* H'-CENTER ADJUSTMENT

(1) Receive the LION PATTERN.(When the LION PATTERN don't,use to the PATTERN

with coITespondence)

(2) Adjust the H-CENTER VR(VRI02) to be indentified with the center position oi the

horizontaI center (Fig 18)

I Resolution: 100OTV lines I

~ 90% --~

.2.../

2

Fig. 18

* ON SCREEN ADJUSTMENT I-

(1) Receive the (cross heatch pattern) r
(2) Adjust the on screen IFT(L703) to be indentified with the position of the side A,B.

(Fig 19)

~ ~

Fig 19

* HIGH VOL T AGE CHECK

CAUTION : There is no HIGH VOLTAGE ADjUSTMENT on this chassis.. The +11(::t2.0)

DC volt power supply must be properly adjusted to insure the corra:t high voltage.

1) Connect an accurate high voltage meter to anode of the picture tube.

2) Turn on the receiver. Set the BRIGHTNESS and CONTRAST controls to minimum.
(zero beam current)

3) High voltage will be measured about 11KV.

4) Rotate the BRIGHTNESS contrai to the both extremes to be sure the high voltage does
not exceed the limit of 12.5KV under any conditions.

COLaR PURITY AD jUSTMENT

NOTE: Before attempting any purity adjustments, the receiver shou1d be operate far at least

flfteen minptes.

1) Demagnetize the picture using a deguassing coil.

2) Turn the CONTRAST and BRIGHTNESS controls to maximum.

3) Adjust REO and BLUE BIAS contrai (VR601 and VR603) to provide only a green raster.
Advance the GREEN BIAS control(VR602) if necessry.

4) Loosen the clamp screw holding the yoke, and slide the yoke backward to pro vide vertical
green belt(zone) in the picture screen.

5) Rotaste and spread the tabs of the 1 purity magnet(Seen fig 20) around the neck of the
picture tube until the green belt is in the center of the screen. At the same time, center

the raster vertically.

6) Move the yoke slowly forward unti! a unifonn green screen is obtained. Tighten the clamp
screw or the yoke temporarily.

7) Check the purity of the red and blue raster by adjusting the BIAS controls.

8) ObtaiJ!ed a white raster, refeIring to "CRT GRA Y SCALE ADjUSTMENT ."

9) Proceed with convergence adjustment.

ADJUST THE ANGLE

PURITY ~ MAGNETS CON

MAGNETS

4POLE (VERTICAL LINES)

\

6POLE

MAGNETS

ROTATE TWO TABS

CONVERGENCE MAGNET ASSEMBLY AT THE SAME rIME

(HORIZONTAL LINES)

ADJUSTMENT OF MAGNETS

Fig 20. Purity and Convergence Magnets

CONVERGENCE AD jUSTMENTS

Note: Before attempting any convergence adjustments, the receiver should be operated far at

least fifteen minutes.

CENTER CONVERGENCE ADJUSTMENTS

1) Receive crosshatch pattem with a colar bar signal generator

2) Adjust the BRIGHTNESS and CONTRAST controls far well defmed pattem.

3) Adjust two tabs of the 4-Pole Magnets to change the angle between them. And superimpose
red a blue vertical lines in the center area of the picture screen.

il and blue horizontal lines at the center of the screen.

4) Tum bolli tabs of the same time without changing position between them to superimpose red

5) Adjust the tabs of 6-Pole Magnets to superimpose redlblue line with green alle. Adjusting the
angle affects the vertical lines and rotating bolli manets affects the horiaontal lines.

6) Repeat adjustménts 3,4,5 observing red,green and blue movemetn,because 4-Pole Magnets and
6-Pole Magnets interact.

BLU I I REO

I I
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j~-=r

G-POLE MRGNETS

MOUEMENT

Fig 22. Center Convergence Adjustment

CIRCUMFERENCE CONVERGENCE AD JUSTMENT

1) Loosen the clampl screw of deflection yoke to allow the yoke to tilt.

2) Tilt front of the deflection yoke up or down to obtain better convergence in circurnference.
Push the nK>unted wedge into the space between picture tube and the yoke to hold the yoke

temporarily.

3) PIace other wedge at bottom and remove the cover paper to, stick.

4) Tilt front of the yoke right or left to obtain better convergence in circurnference.

5) Keep the yoke positioned and put another wedge in either upper space. Remove cover paper

and stick the wecige on picture tube to secure the yoke.

6) Detach the temporarily mounted wedge and put it in another upper space. Stick it on
picture tube to secure the yoke.

7) After inserting three wedges, recheck overall convergence. Tighten the screw firmly to hold
the yoke tightly in pIace.

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ROADSTAR MANAGEMENT SA.

(INTERNATIONAL SERVICE DIVISION)

Via Passeggiata, 1 - BALERNA - SWITZERLAND

Tel. [phone] - Fax. [phone]

e-mail: [e-mail]

ROADSTAR ITALIA S.P.A.

SERVICE DIVISION (DOMESTIC ITALY)

Viale Matteotti, 22 - CERNOBBIO (CO) -ITALY

Tel. [phone] - Fax. [phone]