Roadstar CTV-5512 Manual de usuario

Service Manual - CTV-5512

CTV-5512

Service Manual - CTV-5512

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THE METHOD OF ADjUSTMENTS

* SCREEN VOLUME ADJUSTMENT

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

VR601,602,603to 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 CROSSWAY A LINE, adjust the SCREEN VOLUME.

* WHITE BALANCE ADjUSTMENT

(1) Fix the SERVICE SWITCH to the SERVICE position.

(2) The CROSSWAY A LINE adjust the BIAS VOLUME VR601,602,603the 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 VOLTMETER.

(4) 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 rn .

TP103 RF 55G OSCILLOSCOPE

TP10'4 00 o. 00 -O

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

TP107 TP188 I I

O O O

RGC GND 8: 001uF 001uF

IV-5V 18 5V LDRD1-"Nr-I rSSG LDRD2-"Nr-1 f-SCDPE

1K oh.. 11< ohlll

750hlll

PDUERSUPPLV .

figure 13The Method oi the MeasurementUnit Connection

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

maximum.

3190t1Hz 32 '40MHz

3890MHz

Figure 14.The Wave Sha~ oi VIF

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* TRAP COIL ADJUSTMENT ~

i (1) The measurement unit connect as shown in figure 15.

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

IMI=IINPCB m.

TP1B3 RF SSG OSCILLOSCOPE

TP1B" <0>0 00 00 .o

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

TP1B7 TP1BB

~' B B1uF

o LORO1 -'WY-j 55G

+ -

i, RGC GNO 1K ohmT

i BU-SU 17S0h~

; .,

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

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* 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 ADJUSTMENT

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

pATTERN 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)

90%

lResolution:1000TVlines ,

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)

.2.../

I Resolution: 100OTVlines I

~ 90% --~

Fig.18

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