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CTV-5512
R

Service Manual - CTV-5512

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THE METHOD
* SCREEN VOLUME

OF ADjUSTMENTS
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 CROSSWA Y A LINE, adjust the SCREEN VOLUME.

* WHITE
(1) (2) (3) (4) (5) (6)

BALANCE

ADjUSTMENT

Fix the SERVICE SWITCH to the SERVICE position. The CROSSW AY A LINE adjust the BIAS VOLUME VR601,602,603 the white. Fix the SERVICE SWITCH to the NORMAL JX>sition. Attach the LUMINANCE METER to the contrast to I;naximum. Adjust the BRIGHTNESS and the CONTRAST to minimum. 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.

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* FOCUS VOLUME ADJUSTMENT * ABL ADJUSTMENT
(1) (2) (3) (4)

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

(Automatic

Brightness

Limit)

Receive the CROSS HATCH PATTERN. Adjust the brightness and the CONTRAST VOLUME to maximum. Connect TP105,100 POINT with the DC VOL TMETER. The voltage of TP105,106 POINT adjust the SUB BRIGHTNESS VOLUME(VR701) to 0.22:t 0.OO5(V).

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* VIF DET. COlI.. ADJUSTMENT
(1) The MEASUREMENT UNIT connectas shown in Figure 13. (2) Set the VIF ADjUSTMENT MEASUREMENT UNIT from the left (FREQUENCY(MHz) oi Fìgure 14.)

M~INPCB
TP103

rn
RF 55G

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H-QUT

TP10'4
TP107 TP188

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maximum.

IV-5V

RGC

GND

PDUER SUPPLV

figure 13 The Method oi the MeasurementUnit Connection

(3) FREQUENCY(MHz)

3190t1Hz

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18 5V
8:

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OSCILLOSCOPE
RF-QUT

00

o.

H-IN

00

V-IN

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LDRD1-"Nr-I

001uF

1K oh..

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SSG

001uF LDRD2-"Nr-1 f-SCDPE 11< ohlll

750hlll

MARKER

POINT

adjust the DETECTOR

COIL (T104) to

32

'40MHz

3890MHz

Figure 14. The Wave Sha~ oi VIF

t'
* TRAP COIL ADJUSTMENT
(1) The measurement unit connect as shown in figure 15. (2) Set the adjust measurement unit from the !eft (Frequency MHz of Figure 16)

MI=IIN m. PCB
TP1B3 TP1B" TP1B7 TP1BB RF <0>0
RF-OUT

SSG

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00
H-OUT

OSCILLOSCOPE
00
H-IN

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,

+ RGC
BU-SU

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GNO

POIJER

5UPPLV

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

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LORO1 -'WY-j

B B1uF

55G

1K ohm T 17S0h~

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U-IN

Fig 15. The method of the measurement unit connection

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)

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90%

* 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)

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Resolution:1000TV lines Fig. 17I
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Resolution: 100OTV lines

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90% --~ Fig. 18

* ON SCREENADJUSTMENT
(1) Receivethe (cross heatch pattern) (2) Adjust the on screen IFT(L703) to be indentified with the position of the side A,B. (Fig 19)

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Fig 19

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* HIGH VOLT AGE CHECK

CAUTION : There is no HIGH VOLTAGE ADjUSTMENT on this chassis..The +11(::t2.0) DC volt power supply must be properly adjustedto 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 measuredabout 11KV. 4) Rotate the BRIGHTNESS contrai to the both extremes to be sure the high voltage does not exceedthe limit of 12.5KV under any conditions.

COLaR

PURITY

AD jUSTMENT

NOTE: Before attempting any purity adjustments,the receiver shou1d operate far at least be flfteen minptes. 1) Demagnetize the picture using a deguassingcoil. 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 provide vertical green belt(zone) in the picture screen. 5) Rotaste and spread the tabs of the 1 purity magnet(Seenfig 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 screenis 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!eda white raster, refeIring to "CRT GRA SCALE ADjUSTMENT ." Y 9) Proceed with convergenceadjustment.

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PURITY
MAGNETS

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6POLE

MAGNETS

CONVERGENCE MAGNET ASSEMBLY

Fig 20. Purity and Convergence Magnets

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4POLE ADJUST THE ANGLE (VERTICAL LINES)

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MAGNETS

ROTATE TWO TABS

AT THE SAME rIME

(HORIZONTAL LINES) ADJUSTMENT OF MAGNETS

CONVERGENCE
Note: Before least attempting fifteen minutes. any

AD jUSTMENTS
convergence adjustments, the receiver should be operated far at

CENTER 1) 2) 3) Receive Adjust Adjust red 4) il 5) Tum and Adjust angle 6) Repeat 6-Pole

CONVERGENCE crosshatch the two a blue pattem

ADJUSTMENTS with and 4-Pole in the a colar CONTRAST Magnets center to area bar signal controls change of the

BRIGHTNESS tabs vertical of the lines

the

picture

bolli tabs of blue horizontal the affects tabs the of

the same time without lines at the center of 6-Pole Magnets lines and to

changing position the screen. redlblue

superimpose bolli and

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generator far well angle screen. line affects

defmed

pattem. them. And superimpose

between

between

them

to

superimpose

red

with

green

vertical 3,4,5 interact.

adjustménts Magnets

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1) Loosen 2) Tilt Push front the the of clampl the nK>unted temporarily. 3) 4) 5) PIace Tilt Keep and 6) Detach picture 7) After the other front the stick the tube inserting yoke tightly of yoke the wedge the to

CIRCUMFERENCE
screw of deflection wedge

yoke

positioned wecige

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BLU I I REO

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observing Fig 22. Center deflection up yoke or into the and or left to and put picture tube wedge yoke. recheck

rotating

manets blue

the

horiaontal

red,green

movemetn,because

o
lines. 4-Pole in circurnference. to hold the cover Stick it on firmly to

alle.

Adjusting

the

Magnets

and

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G-POLE MRGNETS
MOUEMENT Adjustment

j

Convergence

CONVERGENCE
yoke to allow the yoke down to obtain better space between picture tube

AD JUSTMENT
the yoke yoke

to

tilt.

convergence and

at

bottom right

remove

the

cover

paper

to, stick.

obtain

better

convergence either

in

circurnference. Remove paper

another to

wedge

in

upper

space.

on

secure

the it

yoke.

temporarily secure three

mounted the wedges,

and

put

in

another

upper

space.

overall

convergence.

Tighten

the

screw

hold

in pIace.

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ROADSTAR MANAGEMENT SA. (INTERNATIONAL SERVICE DIVISION) Via Passeggiata, 1 - BALERNA - SWITZERLAND Tel. +4191-6975155 - Fax. +4191-6975151 e-mail: [email protected] ROADSTAR ITALIA S.P.A. SERVICE DIVISION (DOMESTIC ITALY) Viale Matteotti, 22 - CERNOBBIO (CO) -ITALY Tel. +39031-342340 - Fax. +39031-3346291

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