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– 45 –

1. Correct the quaternary distortion of the horizontal lines at

the top and bottom sections of the screen with GV 4PIN.

1) Since there is no 4SBOW for vertical correction, there will

be a slight imbalance, but adjust to eliminate the distortion
from the horizontal line at either the top or the bottom of the
screen.

2) In many cases, the horizontal lines at the top and bottom sec-

tions of the screen are not straight lines after the adjustment.
As long as the secondary distortion is mild enough that it can
be corrected with the PIN adjustment, this is OK.

GV 4PIN

1. Adjust with GV SSKW so that the tilt of the horizontal lines

at the top and bottom sections of the screen is symmetrical
about the center position horizontal line.

2. Adjust with GV MKEY so that there is no tilt for the line

sections at both sides of the horizontal lines at the center sec-
tion of the stream.

3. Adjust with GV KEY so that there is no tilt for the horizontal

lines at the top and bottom sections of the screen.

4. While tracking, adjust with GV MKEY and GV KEY so that

there is no tilt for the horizontal lines on the entire screen.

5. If the tilt is unbalanced after the GV MKEY and GV KEY

adjustment, adjust again with GV SSKW.

GV SSKW

GV KEY

GV MKEY

MKEY

KEY

GV SSKW

1. Correct the asymmetrical pin distortion at the top and bot-

tom sections of the screen with RGV SBOW.

GV SBOW

1. Adjust the pin distortion for both side sections and the center

of the screen with GV MPIN.

2. Adjust with GV PIN so that the horizontal lines at the top

and bottom sections of the screen are straight lines.

3. Adjust with GV MPIN and GV PIN so that there is no curve

in the horizontal lines on the entire screen.

4. After the adjustments in Items 1-3, adjust the tracking with

GV SBOW, GV MPIN, and GV PIN.

GV SBOW

GV MPIN

GV PIN

MPIN

PIN

– 46 –

1. Receive a cross-hatch signal.
2. Adjust so that the red lines lay on the green lines.

Adjust with the same procedure as the GREEN SUB adjust-
ment.

Notes:

1. The main correction is not carried out during

 red registration adjustment.

2. Beware.  The green adjustment items can be

 changed by mistake.

3. Unlike for green, adjust within the range -127

 ~ +128.

1. Receive a cross-hatch signal.
2. Adjust so that the blue and green lines are on top of each

other.

Notes :

1. The main correction is not carried out during

RED registration adjustment.

2. Beware. The GREEN and RED adjustment

items can be changed by mistake.

1. Receive an off-air signal.
2. Adjust the AGC VR ( TU 1001 ) so that there is no snow

noise and cross-modulation.

1. Receive the monoscope pattern signal and adjust the picture

quality with the menu.

2. Adjust service mode SBRT so that the signal 30 IRE section

barely glows.

3. Receive the all-white pattern signal.
4. Adjust the white balance with service mode GCUT and

BCUT.

5. Adjust service mode SBRT so that the signal 100 IRE sec-

tion barely glows.

6. Adjust the white balance with service mode GAMP and

BAMP.

7. Repeatedly adjust the white balance for the minimum and

maximum picture settings.

1. Receive the white pattern signal on both picture.
2. PICTURE

: minimum

COLOR

: center

BRIGHTNESS : center
TRINTONE

: medium

3. Set to P & P (

) mode, and to service mode.

4. Adjust white balance level of right picture with “ MU2D ”

and “ MV2D ”.

5. Adjust white balance level of left picture with “ SU2D ” and

“ SV2D ”.
• Make this adjustment after adjusting the MAIN PICTURE

white balance level.

– 47 –

When replacing the following components marked with 

 on

the schematic diagram always check HV regulation, and if nec-
essary re-adjust.

: C514
: C514, C515, C516

IC651
T502,T503, T504 (FBT)
D.Y

When replacing the following components marked with 

 on

the schematic diagram always check hold-down voltage and if
necessary re-adjust.

: R514, R561
: C507, C513

D501, D504, D507
IC301, IC501, IC651
R502, R514, R516, R517, R539, R560, R561
T502, T503, T504 (FBT)
D.Y

TP135V

R512

R561

5

1

CN505

IC651

C514

R514

– COMPONENT SIDE –

1. Connect a HV static voltmeter to the unconnected plug of

the high-voltage block.

2. Power on the set.
3. Receive the dot signal. (PICTURE and BRIGHTNESS to

minimum)

4. Check that the HV static voltmeter is reading 31.00

±

1.0kVdc.

1. Connect a HV static voltmeter to the unconnected plug of

the hight-voltage block.

2. Power on the set.
3. Receive the dot signal. (PICTURE and BRIGHTNESS to

minimum)

4. If anode voltage is 32kV or higher, replace C514 of 390PF/

2kV with that of 680PF/2kV, and check if the voltage is within
the standard range.

5. If anode voltage is 30kV or lower, replace C514 of 390PF/

2kV with that of 100PF/2kV, and check if the voltage is within
the standard range.

Remove the cap off from
the unused terminal and
connect a static voltmeter
there.

1. Remove CN651 connecter.
2. Short-circuit across TP-PROT (R692) and ground.
3. Connect a HV static voltmeter to the unconnected plug of

the high-voltage block.

4. Connect a 220k variable resistor, across pin 3 and pin 5 of

IC651 set to maximum value.

5. Power on the set.
6. Receive the dot signal. (PICTURE and BRIGHTNESS to

minimum)

7. Gradually lower the value of the variable resistor and check

that the hold-down circuit operates at a static voltmeter read-
ing of 33.5

±

1.0kVdc when the raster disappears.

1. Repart steps 1 ~ 7 as above.
2. If hold down voltage is 34.5kV or higher, remove R514,

mount a resistor (390k

Ω

, 1/4W : RN) onto R561 instead,

and check again if the hold-down voltage is within the stan-
dard range.

3. If hold down voltage is 32.5kV or lower, mount a resistor

(220k

Ω

, 1/4W : RN) onto R561 and check again if the hold-

down voltage is within the standard range.

 Please finish the adjustment as soon as possible

The following adjustments should always be performed when
replacing IC651.
1. Supply 130VAC to with variable autotransformer.
2. Input a dot signal.
3. Set the PICTURE control and the BRIGHTNESS controls to

minimum.

4. Confirm the voltage of G BOARD TP135V is less than

137.0Vdc.

5. If step 4 is not satisfied, replace IC651 and repeat above steps.

– 48 –

1. Remove CN651 connector.
2. Connect a voltmeter to TP135V, and TP (PROT) and ground.
3. Connect a 220k

Ω

 variable resistor, across pin 3 and pin 5

of IC651 set to maximum value.

4. Supply 120VAC to variable autotransformer.
5. Set PICTURE and the BRIGHTNESS controls to minimum.
6. Gradually turn the  220k

Ω

 variable resistor, and check if OVP

works properly when the voltage of TP135V is between
139.0 ~ 151.5V.