Atari SC1224 User manual

AATARI
SC1224
RGB COLOR MONITOR
Chassis No.: CA-3 j
CONTENTS
SAFETY PRECAUTIONS 2
GENERAL INFORMATION 3
SPECIFICATIONS 3
CONTROL OPERATION 4
THEORY OF OPERATION 5
ADJUSTMENT AND MAINTENANCE 6-8
BLOCK DIAGRAM 9
TIMING CHART 10
TROUBLE SHOOTING CHART 11-20
CHASSIS IMPORTANT PARTS 21
COMPONENT OF P.C.B 22-24
EXPLODED VIEW DIAGRAM 25-26
SCHEMATIC DIAGRAM 27-28
REPLACEMENT PARTS LIST 29-33
SERVICE MANUAL
v

EXPLODED VIEW
nLTW -rfi.
@
MECHANICAL PARTS
DESCRIPTION
CABINET ASSY
COVER ASSY, BACK
HOLDER. SPEAKER
KNOB, CONTROL
KNOB, POWER
HOLDER. SIGNAL CORD
HOLDER. LAMP
CHASSIS. MAIN
METAL. VOLUME FIXING
PLATE ASSY, HEAT SINK
METAL, SIGNAL POWER
PLATE, HEAT SINK
METAL. B'/C FIX (R)
METAL. EARTV
METAL, B/C FIX'(L)
SPRING, SPEAKER
MARK, BRAND
METAL, EARTH HOLDER ,
PLATE. INSULATION
COVER. FUSE
METAL. VOLUME SUPPORTER
PART NO. MATERIAL Q'TY REMARK
300-1 05
D
303-614D
341-236D
440-488D
440-207
A
341-068
A
341 -236
A
31 1-486A
430-273A
4Q7-385A
430-268C
407-384B
430-420A
430-552A
430-421
A
320-01 2B
410-193A
430-554A
407-448A
303-791
A
430-553A ,
HAN NAM HIPS 425TV
HAN NAM HIPS 425TV '
HAN NAM HIPS 425TV '
LUCKY ABS AF-303
LUCKY ABS AF-303
LUCKY ABS AF-303
LUCKY ABS AF-303
SUMILITED
LUCKY ABS AF-303
-29 -

IS1-0JS
SCHEMATIC DIAGRAM
NOTES:
1. Resistors are shown in ohns
K=1.000, M=1.000.000
2. Capacitors are shown in Mf
otherwise noted psfip
3. All resistors are i5*tolerance
Unless otherwise Indicated.
A:REPLACE ALL COMPONENTS
MARKED WITH SAFETY
SYMBOL WITH IDENTICAL TYPE
IMPORTANT SAFETY NOTICE
THE SHADED AREA ON THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL
FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION, FIRE AND
ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IT IS ESSENTIAL THAT
ONLY MANUFACTURER SSPECIFIED PARTS BE USED FOR THE CRITICAL
COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC.
IMPORTANT AVIS SUR LA SECURITE
LA PARTIE OMBREE DE CE DIAGRAME SCHEMATIOUE COMPREND QIMPORTANTES
CARACTERISTIQUES SPECIALES CONTES POUR PROTEGER DES RAYONS X.ET
DES DANGERS o'lNCENDIE ET DE SECOUSSES ELECTRIQ.UES EN CAS DE BESOIN
SI DES PIECES DE CETTE PARTIE OMBREE DOIVENT ETRE REMPLACE S
N'UTILISEZ OUE DES PIECES SPECIFIES PAR LE MANUFACTURER.
-30 -
P/N 484-476A

PINCUSHION AND BARRELLING

SPECIFICATIONS
1. CATHODE RAY TUBE
Type: Non-glare DARK
Size &Deflection angle: 12", 90°
Neck diameter: 20 mm
Phosphor: Paper White
2. INPUT
Input signal: TTL Signal
•Video :1Vp-p Positive
•Audio :1Vp-p
•Vertical Drive :5±1.5 Vp-p Negative
•Horizontal Drive :5±1.5 Vp-p Negative
Power Input :AC 220V 50Hz, 0.26A
Input Connector :13 Pin Din Connector
3. SCANNING
Horizontal frequency :35.7 KHz
Horizontal retrace time :6.3 uS
Vertical frequency: 71.2 Hz
Vertical retrace time :420 uS
4. VIDEO
•Display Area (HXV) :210 mm X130 mm
•Amplifier Type :Linear
•Frequency band width :32 MHz
•Horizontal resolution :1100 lines at center
•Display character :80 X50 characters
5. GEOMETRIC DISTORTION: 2.5% max.
6. LINEARITY
•Horizontal :10% max.
•Vertical :10% max.
7. EXTERNAL CONTROLS: BRIGHTNESS, CONTRAST,
ON/VOLUME
ADJUSTMENT AND MAINTENANCE
CIRCUIT PROTECTION
Circuit protection is provided by one Mini fuse, on the power
pc board. A0.5 Ampere fuse (F901) is wired into one side of
the AC line and provides primary protection to the entire chassis.
1.
CENTERING ADJUSTMENT
CAUTION: The following adjustment points are close to
the high voltage yoke terminal. If the raster is
not centered in the raster opening, it may be
centered by removing the cabinet back and ad-
justing the centering tabs on the neck of the
tube, located at the rear of the deflection yoke.
Turn the whole device clockwise or counter-
clockwise. To increase the amount of raster
shift, move the two tabs which project from
the device, farther apart. If the raster is tilted
on an angle, it may be straightened by loosen-
ing the deflection yoke locking clamp and
rotating the deflection yoke.
2. FOCUS
Adjust the foucs control (VR703) for best overall focus of the
test pattern (marked with the symbol Usually the center
and comers of the screen do not focus at the same setting and
aCompromise must be made.
3. BRIGHTNESS
Adjust subbrightness control (VR301) for visual cut off of the
raster when external brightness is turned to maximum.
4. VERTICAL SIZE AND LINEARITY ADJUSTMENT
The vertical size control (VR602) should be adjusted for the
picture to fill the screen vertically, the linearity control
(VR603) should be adjusted for best overall vertical lineari-
ty. Adjustment of either control will not affect the adjustment
of the other.
5. HORIZONTAL SIZE AND LINEARITY
ADJUSTMENT
The horizontal size control (L702) is located on the main PCB,
it should be adjusted for the picture to fill the screen horizon-
tally, the linearity control (L703) should be adjusted for the
best overall horizontal linearity adjustment so neither con-
trol will affect the adjustment of the other.
-3-

SAFETY PRECAUTIONS
DANCER
There are special components used in ATARI color monitor
which are important for safety. These parts are shaded on
the schematic diagram and on the replacement parts list.
It is essential that these critical parts should be replaced
with the manufacture's specified parts to prevent X-
RADIATION, shock, fire or other hazards. Do not modify
the original design without obtaining written permission
from ATARI or this will void the original parts and labor
guarantee.
X-RADIATION
The only potential source of X-Radiation is the picture tube.
However, when the high voltage circuitry is operating proper-
ly there is no possibility of an X-Radiation problem. The basic
precaution which must be exercised is to keep the high voltage
at the factory-recommended level: the onminal high voltage is
23.0KV and must not exceed 24.0KV at zero beam current at
rated voltage. The following steps decribe how to measure the
high voltage and how to prevent X-radiation.
Note: It is important to use an accurate high voltage meter
calibrated periodically.
CAUTION: No modification of any circuit should be attempted.
Service work should be performed only after you are thoroughly
familiar with all of the following safety checks and servicing
guidelines.
SAFETY CHECK
Care should be taken while servicing this color monitor because
of the high voltage used in the deflection circuits. These voltages
are exposed in such areas as the associated flyback and yoke
circuits.
1To measure the high voltage, use ahigh impedance high
voltage meter. Connect (-) to chassis and (+)to the CRT
anode button.
Turn the brightness control fully counterclockwise.
Measure the high Voltage. The high voltage meter should in-
dicate at the factory-recommended level.
If the upper meter indication exceeds the maximum level, im-
mediate service is rquired to prevent the possibility of
premeature component failure.
To prevent X-Radiation possibility, it is essential to use the
specified picture tube.
FIRE &SHOCK HAZARD
•An isolation transformer must be inserted between the color
monitor and AC power line before servicing the chassis.
•In servicing, attention must be paid to the original lead dress
especially in the high voltage circuit. If ashort circuit is found,
replace all parts which have been overheated as aresult of
the short circuit.
•All the protective devices must be reinstalled per original
design.
•Soldering must be inspected for the cold solder joints, frayed
leads, damaged insulation, solder splashes or the sharp points.
Be sure to remove all foreign materials.
IMPLOSION PROTECTION
All used display tubes are equipped with an integral implosion
protection system, but care should be taken to avoid damage
and scratching during installation. Use only same type display
tubes.
2
GENERAL INFORMATION
•The SC1224 color monitor has the following features:
Uses 3different, independent lines to drive the display—aRED,
aGREEN, and an BLUE line.
•Has abandwidth 18 MHz typical and medium-resolution CDT
(Color Display Tube). So it has agreat resolution and can
display 80-column lines without blurring the characters.
•Uses the positive-level. Analog-compatibility at afrequency
of 15.75 KHz.
•Displays 2000 characters using 8X8 dots format.
•Has its own power control and indicator using the SMPS (Swit-
ching Mode Power Supply). The SMPS in your color monitor
automatically switches to match the applied power (AC 220V).
•Is compatible with ATARI ST Personal Computers.
SPECIFICATIONS
1. PICTURE TUBE 6. CONTROLS
SIZE :12 inch FRONT :On/Volumn, Contrast,
GUN :In-line Brightness (See Fig. 1)
DEFLECTION ANGLE :90° REAR :V-Lin., V-Size
NECK DIAMETER :29.1 mm V-Hold, H-Position,
PHOSPHOR :R.G.B H-Hold (See Fig. 1)
2. SIGNAL 7. ENVRONMENT
INPUT SIGNAL :R.G.B Analog Negative OPERATING TEMPERATURE :10-40°C Ambient
H/V SYNC. :TTL LEVEL 8. TUBE :1
SIGNAL CONNECTOR :13 PIN "D" type 9. IC :4
DISPLAY COLOR :All colors 10. TRANSISTOR :30
3. POWER :AC 220V 50Hz 0.4A 11. DIMENSIONS
4. SCAN FREQUENCY :15.75KHz (H), 60Hz (V) WIDTH :327 mm [12.87 inch]
5. DISPLAY CHARACTERS :25 rows X80 columns DEPTH :367 mm [14.45 inch]
HEIGHT :290 mm [11.42 inch]
12. WEIGHT (SET) :10.7 Kg [23.54 lbs]
<
-3-

sCONTROL OPERATION
•FRONT and SIDE VIEW •REAR VIEW ••
V-Hold
V-Size
V-Lin.
[Figure 1] Monitor Controls
•ON/VOLUME
Turn on the monitor by turning this knob clockwise.
The Power Indicator on the front of the monitor shows that
the power is ON or OFF.
Always turn on the monitor before turning on the computer.
To turn the power off, just turn this knob counterclockwise.
This knob also controls the volume level. Your monitor is
equipped with asmall speaker located on the left side panel.
As you turn the knob further clockwise, the volume level in-
creases; as you turn it counterclockwise, the volume level
decreases. Your computer is capable of sending audio signals
to the monitor, and many programs and games will make use
of the speaker.
•CONTRAST
Turn this knob clockwise to increase contrast.
•BRIGHTNESS
Turn this knob clockwise to increase brightness.
•V-LIN. (R635)
Turn this Potentiometer to conform the picture size vertical-
ly. i.e. this knob adjusts the vertical linearity.
•V-SIZE (R616)
Turn this Potentiometer to adjust the vertical size of the picture.
•V-HOLD (R603)
Turn this Potentiometer to stop vertical rolling of the picture.
•H-POSITION (R710)
Turn this Potentiometer to the right to move the center of the
picture to the right. Turn it counterclockwise to move the center
of the picture to the left.
•H-HOLD (R716)
Turn this Potentiometer to stop horizontal rolling of the picture.
•POWER SOCKET
Plug this socket into apower outlet before turning on the power
switch.
THEORY OF
POWER SUPPLY
The power supply is aSMPS (switching mode power supply) that
consists of switching IC950 (STR41090), SMPS transformer
(T950), and the associated components. The basic theory of the
SMPS is the circuit of self oscillation. The primary winding of
the SMPS transformer is applied the pulse by operating Q931.
Therefore, rectified DC 115V and DC 12V, 14V is obtained by
D960, D961, D962 in the secondary winding of SMPS transformer
T950.
START UP CIRCUIT
An initial start-up circuit drives the horizontal output stage when
the set is initially turned on.
This circuit consists of transistor Q701 and its associated com-
ponents. It provides a drive pulse to the horizontal drive tran-
sistor Q702. Once the FBT-driven voltages operate, diode D706
is forwardbiased and diode D701 is reverse-biased, providing DC
24V to IC601 and Q702. Switching the voltage supply circuit in
the above manner, result in saving power consumption.
HORIZONTAL AND VERTICAL DEFLECTION
SYNCHRONIZATION
The IC701 performs the horizontal synchronization (oscillator).
Ahorizontal rate output pulse is coupled from IC701 pin 12 to
the horizontal driver Q702. The driver stage drives the horizon-
tal output Q703.
The horizontal sync signal coupling IC701 pin 1is derived from
dividing between R708 and R709.
13 of IC701. Apulse from the FBT pin 2is rectified by D705.
HORIZONTAL AFC AND OSCILLATION LIMITTER
The AFC circuit consists of phase detection circuit of IC701 and
the associated component. The oscillation limit circuit is necessary
to prevent the pulse from excessive high voltage. This circuit is
located in IC701 and cotrols the oscillator to maintain the con-
trol signal in its correct frequency and in phase with the horizontal
sync signal.
X-RAY PROTECTION CIRCUIT
The X-ray protection circuit consists of D704, R725 (hold down),
R724, R726 and the associated component that connected to pin
13 of IC701. Apulse from the FBT pin 2is rectified by D705.
Under normal operating conditions, the resultant voltage main-
tains the specified value.
If amalfunction cause excessive high voltage, the amplitude of
the pulse from the FBT increases, causing acorresponding in-
crease in D704 which results in avoltage increase at pin 13 of
IC601. Avoltage increase at IC701 pin 13 makes the X-ray pro-
tection circuit conduct, and the horizontal oscillation operation
no longer functional.
The circuit latches as above, and itis necessary for the circuit to
turn the power off for at least 30 seconds to function again.
VERTICAL OSCILLATION/DRIVE CIRCUIT
The time constant circuit that determines the vertical oscillation
frequency consists of IC701, C602, R603 and C603 connected at
IC701 pin 18. Vertical size control function is performed by R615,
causing the negative feed back to change.
-4-
OPERATION
VERTICAL OUTPUT
Vertical out circuit consists of IC601 and associated component.
HORIZONTAL DRIVE CIRCUIT
To obtain horizontal drive pulses from IC701 pin 12, the horizon-
tal oscillator must be working.
Horizontal drive pulses from IC701 pin 12 are applied to horizon-
tal driver Q702. The B for Q702 is supplied from the 50V line
through D706. During initial receiver turn-on before the FBT
(drive supply voltages are developed), an initial Bis supplied
to Q702 from the regulated 115 volt line through R704.
HORIZONTAL OUTPUT
Horizontal drive pulses from Q702 are coupled through T701 to
the base of horizontal output Q703. Transistor Q703 is biased
on when the beam is at about mid-screen.
The charge stored on C732 and C733 causes current to flow
through the horizontal yoke winding and Q703 to ground. When
the beam reaches the right side of the screen, Q703 is turned off,
and the current in the yoke is directed into C715 and C716. At
the same time current flows into C715 and C716 from the
regulated B~*~ via the FBT primary winding.
Due to resonance, the current then reverses and flows back
through the horizontal yoke winding into C732 and C733. This
action defects the electron beam back to the +115V regulated
B+.
PINCUSHION CORRECTION
The pincushion correction circuit consists of T703, Q602 and its
associated components.
The horizontal yoke current is increased or decreased in response
to vertical parabola pulses.
POWER SUPPLY DESCRIPTIONS
This SMPS (switching mode power supply) using STR41090 ob-
tains rectified DC115V, 12V, 14V from AC220V.
Power is supplied in the following procedure:
1) AC220V supplied from the AC socket is rectified by BD901.
2) Rectified voltage is supplied to the T950. As to STR41090.
Voltage which is primarily rectified by D951, is supplied to
pin 2 of IC951 through R952, R953, R954.
3) At this moment, apulse is generated at pin 3 of the IC950,
which switches Q3 by internal oscillation of IC951.
4) This oscillation causes IC950 to switched, and at the secon-
dary terminal of T950, avoltage proportional to the turn ratio
is generated.
5) The generated voltage supplies DC 115V, 12V, 14V to the out-
put terminal after the rectified by D960, D961, D962 and
filtered by C961, C963, C965 and L961.
6) Between Pins 5and 6 of T950, avoltage is generated propor-
tional to turn the ratio from voltage generated between Pins
11 and 12.
7) Detecting voltage (pin 1of IC950) is obtained through D950
by generated voltage (pin 6in T950) is 90V.
8) Over current protection circuit (Q950, R951) is existed in order
to protect Q3 in IC950 from surge current which may be
caused at power switch on or off and output short-circuit.
5-

ADJUSTMENT AND MAINTENANCE
GENERAL INFORMATION
AH adjustments are thoroughly checked and corrected when the
monitor leaves the factory. Therefore the monitor should operate
normally and produce proper color and pictures upon installa-
tion. However, serveral minor adjustments may be required
depending on the particular location in which the monitor is to
operate. This monitor is shipped completely in cardboard car-
ton. Carefully draw out the monitor from the carton and remove
all packing materials. Plug the power cord into aconvenient 220
volts 50 Hz AC power outlet. Never connect to direct current
or any other power outlet or frequency. Check and adjust all the
customer controls such as BRIGHTNESS, and CONTRAST to
obtain anormal picture,
AUTOMATIC DEGAUSSING
Adegaussing coil is mounted around the picture tube so that ex-
ternal degaussing is normally unnecessary after moving the
monitor. The monitor should be properly degaussed upon in-
stallation. The degaussing coil operates for about 1second after
the power to the monitor is switched ON. If the set is moved
or faced in adifferent direction, the power switch must be swit-
ched off for at least 10 minutes in order that the automatic
degaussing circuit operates properly.
Should the chassis or parts of the cabinet become magnetized to
cause poor color purity, use an external degaussing coil. Slowly
move the degaussing coil around the faceplate of the picture tube,
the sides and front of the monitor, and slowly withdraw the coil
to adistance of about 2meters before disconnecting it from the
AC source. If color shading still persists, perform the CON-
VERGENCE ADJUSTMENT procedures, as mentioned later.
HIGH VOLTAGE CHECK
WARNING: There is no HIGH VOLTAGE ADJUSTMENT
on this chassis. The +115 volt power supply must
be properly adjusted to insure the correct high
voltage.
1. Connect an accurate high voltage meter to the second
anode of the display tube.
2. Turn on the monitor. Set the BRIGHTNESS and CONTRAST
controls to monimum (zero beam current).
3. High voltage will be measured below 24.0 KV.
4. Rotate the BRIGHTNESS control to both extremes to be sure
that the high voltage does not exceed the limit of 24.5 KV
under any conditions.
FS CIRCUIT CHECK (Hold Down)
The FS (fail safe) circuit check is indispensable for the final check.
Checking should be done following steps:
1. Turn the power switch ON and adjust customer controls for
normal operation.
2. Connect aVTVM between (the cathode of D704) and the
chassis ground.
3. Adjust brightness, and contrast, for mechanical minimum.
4. Adjust the Hold-down VR (R725) on the main board for the
voltage of (the cathode voltage of D704) in DC10.25V.
5. After adjusting the voltage, fix the hold down VR (R725) with
EPOXY or same kind of bond.
6. Check the set in the hold down when the voltage of TP5 (the
cathode voltage of D704) is 13.2V +0.5, —0V.
7. If this monitor is not the FS (fail safe), repeat steps 1through 5.
HORIZONTAL OSCILLATOR ADJUSTMENT
If there is an indication of unstable horizontal sync., adjust the
HORIZONTAL HOLD control (R716) until screen image is stable.
VERTICAL OSCILLATOR ADJUSTMENT
If the picture moves up or down on the screen, adjust the VER-
TICAL HOLD control (R603) at the back of the monitor until
there is asingle image without vertical movement.
VERTICAL SIZE ADJUSTMENT
The vertical size control (R616) on the main board changes the
size of the picture or pattern, having an equal effect on the top
and bottom. The final adjustment for the V-size of picture is 150
mm for 12".
FOCUS ADJUSTMENT
Adjust the FOCUS control on the focus pack for well defined
scanning lines in the 1/4 and 3/4 points of the screen.
HORIZONTAL WIDTH ADJUSTMENT
Adjust the horizontal width control coil (L702) by turning it with
a hexagonal adjusting tool so that the width of the picture (data
display area) is 210 mm for 12".
H-POSITION ADJUSTMENT
Adjust the H-position control (R710), so that the center of pic-
ture is the same as the mechanical center of the screen.
V-LINEARITY ADJUSTMENT
1. Display the cross hatch with the character generator.
2. Adjust R635 (V-LIN.) to the best condition.
3. Non-Linearity should be within ±7%.
4. If V-size is changed after adjusting R635 (V-LIN.), readjust
R616 (V-SIZE). At the time, signal is reverse pattern.
SUB-BRIGHTNESS ADJUSTMENT
1. Supply white color with acomputer to the video input
terminal.
2. Turn the contrast to the maximum with the contrast volume
(fully clockwise) and BRIGHTNESS to the minimum with the
bright volume (fully counterclockwise).
3. Adjust the sub-bright volume (R742) to cut-off the picture
slightly.
.. VERTICAL CENTER ADJUSTMENT
Adjust the V-center control (R626), so that the center of the pic-
ture is the same as the mechanical center of the screen.
SIDE PCC ADJUSTMENT
1. Display the reverse pattern with the character generator.
2. Adjust to minimum by rotating R621 (side PCC).
3. At this time, the pincushion or barrel distortion should be
within 1.5% (max.)
WHITE BALANCE ADJUSTMENT
1. EQUIPMENT
•Video Signal generator: LVG-1600 (Analog input)
R: lVp-p G: lVp-p B: lVp-p
•Oscillascope
•W/B meter
•Color analyzer
2. Adjustment 1
•Input the 16 step wave 4 Pattern) to the set.
•Set the BRIGHTNESS, CONTRAST VOL to the maximum.
•Set the Video output level (R511 rear part) 45Vp-p with ad-
justing the G. DRIVE (R303).
•Set the Video output level (R510 rear part) 45Vp-p with ad-
justing the R.DRIVE (R323.)
•Adjust R.LEVEL (R369) in order to agree with Rand G.
output level when CONTRAST is minimum position.
•Adjust the R.DRIVE again in order to agree with Rand G.
output level when CONTRAST is maximum.
•When CONTRAST is maximum or minimum. As above
(4) (5) (6) adjust the B.DRIVE (R343) in order to agree with
Band G. OUTPUT Level.
3. Adjustment 2
•Set the SCREEN, CONTROL BRIGHTNESS, CONTRAST
VOL.
•Set the SUB BRIGHT (R742) to the maximum.
•Set the R.CUT OFF (R317). G. CUT OFF (R337) B. CUT
OFF (R357) to the center position.
•Input the reverse pattern.
•Set the reverse pattern 3FL in the COLOR ANALYZER with
rotating the SCREEN CONTROL.
•In the case, adjust R.G.B CUT OFF (R317, R337, R357) As
below X.Y with W/B METER.
X: 0.28 ±0.002 =0.279 -0.283
Y: 0.311 ±0.002 =0.309-0.313
4. Adjustment 3
Set the CONTRAST AND BRIGHTNESS VOL to the max-
imum. Set the reverse pattern 28FL in the COLOR
ANALYZER with rotating the SUB-BRIGHT (R742).
CONVERGENCE ADJUSTMENT
NOTE: Before attempting any convergence adjustments, the
monitor should be operated for at least fifteen minutes.
•Center Convergence Adjustment
1. Supply acrosshatch pattern with a color character generator.
to the video input.
2. Adjust the brightness and contrast controls for awell defined
pattern.
3. Adjust the two tabs of the 4-pole magnets to change the angle
between them (See Figure 3) and superimpose red and blue
vertical lines in the center area of the picture screen. (See Figure
4).
4. Turn both the tabs at the same keeping the angle constant to
superimpose red and blue horizontal lines at the center of the
screen. (See Figure 4)
5. Adjust the two tabs of the 6-pole magnets to superimpose
red/blue line and agreen one. Adjusting the angle affects the
vertical lines, and rotating both magnets affects the horizon-
tal lines.
6. Repeat adjustment steps 3,4,5 describing red, green and blue
movements. The 4-pole magnets and the 6-pole magnets have
mutual affection making dots movement complex.
•Circumference Convergence Adjustment
1. Loosen the clamping screw of deflection yoke to allow the yoke
to tilt.
2. Put awedge temporarily, as shown in Figure 2. (Do not
remove the cover paper on the adhesive part of the wedge.
)
3. Tilt front of the deflection yoke up or down to obtain better
convergence in circumference. (See Figure 2) push the mounted
wedge into the space between display tube and the yoke to
fix the yoke temporarily).
4. Put the other wedge into the bottom space and remove the
cover paper.
5. Tilt the front of the yoke right or left to obtain better con-
vergence in circumference. (See Figure 2).
6. Keep the yoke position and put another wedge in eighter up-
per space. Remove the cover paper and stick the wedge on
the display tube to fix the yoke.
7. Detach the temporarily mounted wedge and put it in another
upper space. Stick it on the display tube to fix the yoke.
8. After attaching three wedges, recheck overall convergence.
Tighten the screw firmly to fix the yoke and check the yoke
is firm.
9. Stick 3 adhesive tapes on the wecjges as shown in Figure 2.
-6--7-

BLOCK DIAGRAM

SCHEMATIC DIAGRAM
CA-3 CHASSIS SCHEMATIC DIAGRAM
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CONTRAS! SPAfl'
NOTES: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 1/8W,
•5* VALUES IN 0HMS.G=t2*
K=1,000 M=1.000.000
2. ALL CAPACITORS ARE SHOWN
IN (IF P=I0'bF
3. COIL
UNIT OF INOUCTANCE IS |AH
IMPORTANT SAFETY NOTICE
THE COMPONENT IDENTIFIED BY SHADING OR THE INTERNATIONAL
SYMBOL AON THIS SCHEMATIC DIAGRAM INCORPORATES SPECIAL
FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION, FIRE AND
ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IT IS ESSENTIAL THAT
ONLY MANUFACTURER'S SPECIFIED PARTS BE USED FOR THOSE CRITICAL
»DO» OUTPUT
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Q32S 1S7473
0714 R747
ROSUB 1SKI1/2WI
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KTC7279 IC601 IA7D0
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1723 ,£734 Cf
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TOOTH GEN Q703
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C761
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C721
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1*.... 1.iNffW.-R L-ru. . IWp-* 1AVp-p 49Vp-#
P/N 484-257A
-27- -28-

REPLACEMENT PARTS LIST
(MECHANICAL PARTS)
NO. DESCRIPTION PART NO. MATERIAL Q'TY REMARK
tCABINET 301-186A HIPS 1
2COVER, BACK 303-721
A
HIPS 1
3HOLDER. SPEAKER 341-236A HIPS 1
4KNOB, CONTROL 440-488D HIPS 3
5HOLDER, SIGNAL CORD 341-068A HIPS 1
6HOLDER. LED 341-23BA HIPS 1
7GUIDE PCB 348-026A HIPS 1
8SEAT RUBBER 327-032A NEOPRENE 4
9METAL, B/C SUPPORTER 430-502A 1
10 METAL, B/C SUPPORTER 430-503A 1
11 SCREW HEXGON, HEAD 4
12 METAL. PCB FIXING 430-498B 1
13 METAL VOLUME FIXING 430-5040 1
14 METAL PCB FIX (SMPS) 430-5500 1
15 PLATE. HEAT SINK 407-390A 1
16 PLATE. PCS FIXING 407-391
A
1
17 METAL, SMPS CASE FIXING 430-501C 1
18 PLATE, INSULATION 407-142A 1
19 COVER, SMPS 303-727A 1
20 SPRING. SPEAKER 320-0120 1
21 METAL. EARTH HOLDER 430-554A 1
22 METAL. HEAT SINK 430-269A 1
23 METAL. HEAT SINK 430-239A 3
24 PLATE. SHIELD FBT 407-602A 1
25 MARK BRAND 410-193B 1

TIMING CHART
((
HORIZONTAL TIMING
VERTICAL TIMING
*NOTES
1. SIGNAL INPUT LEVEL: lVp-p
2. TIME TOLERANCE: ±0.1%
3. THE MONITOR IS ADJUSTED ACCORDING TO THE ABOVE TIMINGS AND FREQUENCY.
-io-
TROUBLE SHOOTING CHART

B. NO POWER (
.2

C-l. TROUBLE IN HORIZ OUT CIRCUIT ( ( D.
DOES NOT APPEAR
SPECIFIC COLOR
INPUT SIGNAL
CABLE or
LOGIC SIDE
NO TROUBLE
IN 115V LINE
TROUBLE IN
VIDEO OUT PUT
TRANSISTOR (Q501-Q506)
TROUBLE IN
R510, R511
NO R512
CHECK G1.G2
VOLTAGE
Gl—ABOUT-55V
G2—ABOUT-340V
TROUBLE NO
FBT ^
—
ABOUT 4.5Vp-p
REPLACE CRT
-14 -15

E. NO HORIZONTAL SYNC.
-16 -
(
F. NO VERTICAL SYNC.
-17 -

G. CONVERGENCE IS BAD
H. FOCUSING PROBLEM
-18
I. VERTICAL PIN COMPENSATION (V.PCC) IS BIG
J. HORIZONTAL LINE
-19 -

K. NO SOUND
TROUBLE IN IC401
(t k
a(
CHASSIS IMPORTANT PARTS
H. WIDTH COIL (L702)
SUB BRIGHT (R742)
SCREEN
FOCUS
HOLD DOWN (R725)
•H-HOLD (R716)
SIGNAL CABLE
V-CENTER (R626) H-POSITION (R710)
ON/VOLUME V-HOLD (R603)
V-SIZE (R616)
CONTRAST-
BRIGHTNESS V-LIN. (R635)
SIDE PCC (R621) DRIVE (R343)
B.CUT OFF (R357)- G. DRIVE (R303)
G.CUT OFF (R337) R.LEVEL (R369)
R.CUT OFF (R317) R.DRIVE (R323)
B. LEVEL (R372)
2

2. C.P.T. P.C.B LAYOUT

3. POWER P.C.B LAYOUT
GOLD STAR Co., Ltd P/N III-069A
-24 -

REPLACEMENT PARTS LIST
CAUTION: Before replacing any these components, read carefully the "SAFETY PRECAUTION" on page 2.
Do not degrade the safety of the receiver through improper servicing.
ABBREVIATIONS: Capacitors .... CC: Ceramic (TC), CE: Chemical, CK: Ceramic (Hi-K), MPP: Metalized Polypropylens,
Resistors RD: Carbon Film, RS: Metal Oxide Film,
RN: Metal Film, RV: Variable, RF: Fusing, SR: Semifix.
(All CC and Plastic Capacitors are ±50%, 50 Volts and all resistor, ±5%, 1/8 unless other wise noted).
:Recommend Service Parts
1. MAIN P.W.B
LOCATION
NUMBER PART NO. DESCRIPTION LOCATION
NUMBER PART NO. DESCRIPTION
RESISTOR R343 180-098M SR29R 330B
R344 01157131 RD, 1/8W 47K ohm
R301 01157071 RD, 1/8W 82 ohm R345 01157129 RD, 1/8W 22K ohm
R302 01157091 RD, 1/8W 560 ohm -R346 01157093 RD, 1/8W 680 ohm
R303 180-098M SR29R 330B R347 01157065 RD, 1/8W 47 ohm
R304 01157131 RD, 1/8W 47K ohm R348 01157121 RD, 1/8W 10K ohm
R305 01157129 RD, 1/8W 22K ohm R349 01157097 RD, 1/8W IK ohm
R306 01157093 RD, 1/8W. 680 ohm R350 01157090 RD, 1/8W 510 ohm
R307 01157065 RD, 1/8W 47 ohm R351 01157131 RD, 1/8W 47K ohm
R308 01157121 RD, 1/8W 10K ohm R352 01157129 RD, 1/8W 22K ohm
R309 01157097 RD. 1/8W IK ohm R353 01157082 RD, 1/8W 240 ohm
R310 01157090 RD. 1/8W 510 ohm R354 01157145 RD, 1/8W lOOKohm
R31
1
01157131 RD. 1/8W47K ohm R355 01157053 RD, 1/8W 15 ohm
R312 01157129 RD, 1/8W 22K ohm R356 01 157084 RD, 1/8W 300 ohm
R313 01157082 RD, 1/8W 240 ohm R357 180-098D SR29R 1KB
R314 01157145 RD, 1/8W 100K ohm R358 01157121 RD, 1/8W 10K ohm
R315 01157053 RD, 1/8W 15 ohm R359 01157091 RD, 1/8W 560 ohm
R316 01157084 RD, 1/8W 300 ohm R360 01157129 RD, 1/8W 22K ohm
R317 180-098D SR29R 1KB R361 01154045 RD, 1/2W 6.8 ohm
R318 01157121 RD, 1/8W 10K ohm R362 01157110 RD, 1/8W 3.6K ohm
R319 01157091 RD, 1/8W 560 ohm R363 01521025 RN, 1W 1ohm
R320 01157129 RD, 1/8W 22K ohm R364 01154101 RD, 1/2W 1.5K ohm
R321 01157071 RD, 1/8W 82 ohm R365 01157109 RD, 1/8W 3.3K ohm
R322 01157091 RD, 1/8W 560 ohm R366 01157109 RD, 1/8W 3.3K ohm
R323 180-098M SR29R 330B R367 01157109 RD, 1/8W 3.3K ohm
R324 01157131 RD, 1/8W 47K ohm R368 01157094 RD, 1/8W 750 ohm
R325 01157129 RD, 1/8W 22K ohm R369 180-098
D
SR29R 1KB
R326 01157093 RD, 1/8W 680 ohm R370 180-071
G
VAR 500E
R327 01157080 RD, 1/8W 200 ohm R372 180-098D SR29R 1KB
R328 01157121 RD, 1/8W 10K ohm R401 01157113 RD, 1/8W 4.7K ohm
R329 01157097 RD, 1/8W IK ohm R402 01157104 RD, 1/8W 2K ohm
R330 01157090 RD, 1/8W 510 ohm R403 01157097 RD, 1/8W IK ohm
R331 01157131 RD, 1/8W 47K ohm R404 01154063 RD, 1/2W39 ohm
R332 01157129 RD, 1/8W 22K ohm R405 01157093 RD, 1/8W 680 ohm
R333 01157082 RD, 1/8W 240 ohm R406 01157115 RD, 1/8W 5.6K ohm
R334 01157145 RD, 1/8W 100K ohm R407 01157043 RD, 1/8W 5,6 ohm
R335 01157053 RD, 1/8W 15 ohm R408 01154043 RD, 1/2W 56ohm
R336 01157084 RD, 1/8W 300 ohm R409 140-021
A
RV, 10KB
R337 180-098
D
SR29R 1KB R410 ,01142081 RD, 1/8W 220 ohm
R338 01157121 RD, 1/8W 10K ohm R601 01154049 RD, 1/2W 10 ohm
R339 01157091 RD, 1/8W 560 ohm R602 01157109 RD, 1/8W 3.3K ohm
R340 01157129 RD, 1/8W 22K ohm R603 180-098E' SR29R 4.7KB
R341 01157071 RD, 1/8W 82 ohm R604 01157147 RD, 1/8W 120K ohm
R342 01157091 RD, 1/8W 560 ohm R605 01157147 RD, 1/8W 120K ohm
-29 -