Tatung VS-10S Schematic

VS-10S

SERVICE MANUAL

CONTENTS

1 SPECIFICATION

2 OPERATING INSTRUCTIONS

3 IMPORTANT SAFEGUARDS

4 ADJUSTMENT PROCEDURE

5 BLOCK DIAGRAM

6 SERVICE NOTES

7 CIRCUIT DIAGRAM

8 LAYOUT DIAGRAM

9 EXPLODED DRAWING

10 PARTS LIST

1 SPECIFICATION

10” Mono Chrome Monitor

CRT SIZE : 10” (9V)

DOT PITCH : 0.26

DEFLECTION ANGLE : 90º

SCAN FREQ. : HOR. 31.5KHz, 35KHz, 38 KHz

VER. 50 ~ 90 Hz

RESOLUTION : 640 x 480, 800 x 600, 1024 x 768

BANDWIDTH : 26 MHz, 35 MHz, 45MHz
VIDEO SIGNAL : VIDEO ANALOG 0.7V/75Ω

SYNC INPUT TYPE : H - SYNC, V - SYNC TTL

INPUT CONNECTOR : 15 PIN D SHELL

USER CONTROL : BRI, CON, POWER SW, V - SIZE,

H - SIZE, V – CENTER

INPUT VOLTAGE : AC 100 ~ 240V, 50 ~ 60 Hz (AUTO)

POWER CONSUMPTION : 68W MAX.

DIMENSION : 257W x 270H x 300D mm

NET WEIGHT : 6.8 Kg

SAFETY : UL, CUL, DHHS, TÜV – GS

EMI : FCC – B, CE

2 OPERATING INSTRUCTIONS

2-1 POWER SWITCH

Turn on the power switch on your PC system. Then turn on the power of
the monitor by pressing the switch on the front of the unit.

2-2 POWER INDICATOR

A green indicator LED indicated the power is on. An orange indicator L E D
indicates the power is in power saving mode.

2-3 BRIGHTNESS ADJUSTMENT

Adjust the control to get the desired level of brightness. Rotate clockwise
for brighter on the background.

2-4 CONTRAST ADJUSTMENT

Adjust the control to get the desired level of contrast. Rotate clockwise to
get more contrast.

2-5 HORIZONTAL-SIZE ADJUSTMENT

Adjust the control to get adequate horizontal size. Rotate clockwise to get a
fuller display size.

2-6 VERTICAL-SIZE ADJUSTMENT

Adjust the control to get adequate vertical size. Rotate clockwise to get a
larger display size.

2-7 VERTICAL-CENTER ADJUSTMENT

Adjust the control to get adequate vertical position. Rotate clockwise to
move the screen up.

2-8 HORIZONTAL-PHASE ADJUSTMENT

Adjust the control to get adequate horizontal position. Rotate clockwise to
reposition to the right.

3 IMPORTANT SAFEGUARDS

For your own safety, read all of these instructions and save them for later
reference.

3-1 POWER PLUG

This display monitor is equipped with a 3-wire grounding type power plug.
The third pin provides a safety ground for the display frame and will fit
only into the power outlet of compatible configuration.

Contact your technician to replace the obsolete outlet. Do not defeat the
safety purpose of the grounding plug.

3-2 POWER INPUT

This display should be operated only from the types of power source
indicated on the label. If there is any question about the type of power
supplied to the outlet, consult your technician or dealer.

3-3 VENTILATION

Openings on the cabinet back and bottom are provided for ventilation. To
insure reliable operation and to protect the display from overheating, these
openings must not be blocked or covered. Do not place the display near or
over a radiator or heating vent. If this unit is installed within another
enclosure be sure that adequate ventilation has been provided.

Never push objects of any kind through the cabinet openings. They may
touch dangerous voltage points or cause short circuits that could result in
fire or electrical shock.

3-4 ATTACHMENTS

Signal sources must be of approved types, properly grounded, if safety
standards are to be maintained ask the service technician to perform routine
safety tests to determine that all equipment is in safe operating condition.

Overloaded or poorly grounded AC power systems can cause severe
difference in ground potential between the display and the signal source.
Particularly on long video lines where the display and the source are
plugged into different AC power circuits. Besides causing signal
instability, ground potential may be great enough to present a shock hazard.
Ground potential test should be a part of the routine safety check carried out
by the service technician.

3-5 CLEANING

Unplug the power cord from the outlet before cleaning the display . Use
only a damp cloth and mild detergent. Do not use strong liquid cleaner or
aerosol sprays. Do not attempt to clean the interior of the unit: this action
must be performed by the service technician as required during normal
maintenance.

3-6 SERVICE

Removal of the back by an unauthorised person may expose the user to
dangerous voltage or other hazards.

Refer all servicing to qualified service personnel. Unplug the display from
the power outlet and notify the service technician should any of the
following occur

(a) If liquid has been spilt into the display
(b) If the display has been exposed to rain or water
(c) If the display has been dropped or the cabinet damaged
(d) If fuses continue to blow
(e) If the power cord is damaged or frayed
(f) If a distinct change from normal operation is apparent.

4 ADJUSTMENT PROCEDURE

This alignment procedure is for adjusting/testing picture performance, in
order to obtain the optimum result, the following adjustment sequence must
be followed step by step:

4-1 Check B+ voltage:

a. Test pattern: 640 x 480 cross-hatch.
b. Set up external brightness and contrast VR to central position.
c. Adjusted VR501 have 95Vdc ± 0.5Vdc use digital multimeter

positive leader test J9 positive point, negative leader to ground.

4-2 Vertical linearity adjustment:

a. Test pattern: 640 x 480 cross-hatch.
b. Set up external brightness and contrast VR to central position.
c. Adjust VR302 to make equal distance between top-center and

bottom-center.

4-3 Horizontal-hold adjustment:

a. Test pattern: 640 x 480 cross-hatch.
b. Set up external brightness and contrast VR to central position.
c. Turn off horizontal-sync (pin to ground)
d. Adjust VR602 to ma ke pattern upright.

4-4 Pin-cushion adjustment:

a. Test pattern: 640 x 480 cross-hatch.
b. Set up external brightness and contrast VR to central position.
c. Adjust VR304 make picture to top and bottom ≤ 2mm, left and right

≤ 2mm.

4-5 Brightness adjustment:

a. Test pattern: 640 x 480 full-white.
b. Set up external brightness and contrast VR to maximum.
c. Test R251, then adjust VR701 to –20Vdc ± 0.1Vdc.

4-6 X-ray protection adjustm e nt:

a. Test pattern: 640 x 480 cross-hatch.
b. Test TP2, then adjust VR 603 to 5.2 Vdc ± 0.1Vdc.

4-7 White balance adjustment:

a. Test pattern: 640 x 480 “ 2” balance.
b. Set up external brightness and contrast VR to maximum.
c. Adjust VR240, VR243, VR241 have R.G.B. cathode to 55Vdc.
d. Turn external brightness VR to minimum.
e. Set VR209 to central position.
f. Adjust VR245, V R244, VR248 have R.G.B cathode to 30V p-p.

4-8 White balance adjustment:

a. Test pattern: 640 x 480 full-white.
b. Set up external brightness to center.
c. Turn external contrast VR to 2FL.
d. Adjust VR240, VR 243, VR241 to X = 281 ± 15 m m,

Y = 298 ± 15 mm.
e. Turn external contrast to maximum.
f. Adjust VR245, VR244, VR248 to X = 281 ± 15 mm,

Y = 298 ± 15 mm.

4-9 Raster brightness adjustment:

a. disconnect video signal.
b. External brightness to maximum.
c. Adjust FBT screen VR to 0. 5 ~ 1.5 FL.

4-10 Full-white adjustment:

a. test pattern: 640 x 480 full-white.
b. Set up external brightness VR to center, external contrast VR to

maximum.
c. Adjust VR212 have luminance equal to 25 ~ 45 FL.

4-11 Purity check:

a. test pattern: 640 x 480 full-white
b. set up external brightness and contrast VR to maximum position.
c. Change to Red/Green/Blue colour for every check if purity is good.

4-12 Misconvergence check:

a. test pattern: 640 x 480 cross-hatch
b. use klein optica convergence gauge change to R/B, R/G, B/G colour

for every check misconvergence.
c. center area (d = 0.15 mm ) , A zone, B zone (0.4mm).