Roadstar CTV-5512 User manual

Service Manual - CTV-5512
R
CTV-5512
Service Manual - CTV-5512

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'i,C, -:
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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t'
* 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.
i,
i
t
i
1
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)
T
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
.2.../
I Resolution: 100OTVlines I
~ 90% --~
Fig.18
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-
* ON SCREENADJUSTMENT I-
(1) Receivethe (cross heatchpattern) r
(2) Adjust the on screenIFT(L703) to be indentified with the position of the side A,B.
(Fig 19)
~ ~
Fig 19
* HIGH VOLTAGE CHECK
CAUTION : There is no HIGH VOLTAGE ADjUSTMENT on this chassis..The +11(::t2.0)
DC volt power supplymust be properlyadjustedto insurethe corra:t high voltage.
1) Connectan accuratehigh voltage meterto anodeof the picture tube.
2) Turn on the receiver. Setthe BRIGHTNESSand CONTRAST controls to minimum.
(zerobeam current)
3) High voltage will be measuredabout11KV.
4) Rotatethe BRIGHTNESS contrai to the both extremesto be sure the high voltage does
not exceedthe limit of 12.5KV under any conditions.
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COLaR PURITY AD jUSTMENT
NOTE: Before attempting any purity adjustments,the receivershou1dbe operatefar at least
flfteen minptes.
1) Demagnetize the picture using a deguassingcoil.
2) Turn the CONTRAST and BRIGHTNESScontrols to maximum.
3) Adjust REO and BLUE BIAS contrai (VR601and VR603)to provide only a greenraster.
Advance the GREENBIAS 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) Rotasteand spreadthe tabs of the 1 purity magnet(Seenfig 20)aroundthe neck of the
picture tube until the greenbelt is in the centerof the screen.At the sametime, center
the raster vertically.
6) Move the yoke slowly forward unti! a unifonn greenscreenis obtained.Tighten the clamp
screw or the yoke temporarily.
7) Checkthe purity of the red and blue raster by adjustingthe BIAS controls.
8) ObtaiJ!eda white raster, refeIring to "CRT GRAY SCALE ADjUSTMENT ."
9) Proceedwith convergenceadjustment.
ADJUST THE ANGLE
4POLE (VERTICAL LINES)
PURITY ~ MAGNETS CON
MAGNETS
\
6POLE
MAGNETS
ROTATE TWOTABS
CONVERGENCEMAGNETASSEMBLY AT THE SAME rIME
(HORIZONTAL LINES)
ADJUSTMENTOF MAGNETS
Fig 20. Purity and ConvergenceMagnets
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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.
4) Tum bolli tabs of the same time without changing position between them to superimpose red
il and blue horizontal lines at the center of the screen.
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
I I 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]