Tatung VM9AF Bedienungsanleitung

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VM-9AF

SERVICE MANUAL

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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

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1 SPECIFICATION

9” Mono Chrome Monitor

CRT SIZE : 10” 90 DEGREES, 20 O

PHOSPHOR : H68

FACEPLATE : SILICA NON-GLARE

SCAN FREQ. : HOR. 31, 5KHZ, 35.5KHZ, 38KHZ

VERT. 50-90HZ

RESOLUTION : 640X480, 800X600, 1024X768

BANDWIDTH : 26MHZ, 35MHZ, 45MHZ

VIDEO SIGNAL : R.G.B. INPUT, 1V p.p. MAX.

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

INPUT CONNECTOR : 15PIN D SHELL

USER CONTROL : BRI, CON, POWER SW, V-LINE, H-PHASE

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

POWER CONSUMPTION: 32W MAX.

DIMENSION : 237W X 237H X 248D mm

NET WEIGHT : 3.8Kg

SAFETY : UL, CSA, DHHS, TUV-GS, MPR II

EMI : FCC-B, CE

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2 OPERATING INSTRUCTIONS

2-1 POWER SWITCH

Power on/off switch is a push button. To turn on the power of the unit,

press this switch. To turn off the unit, press it again.

2-2 POWER-ON INDICATOR

The power-on indicator when the power is turned on.

2-3 BRIGHTNESS CONTROL

Turn the brightness control clock-wise to increase the brightness and

counter clock-wise to decrease it.

2-4 CONTRAST CONTROL

Turn the contrast control clock-wise to increase the contrast and counter

clock-wise to decrease it.

2-5 HORIZONTAL-PHASE CONTROL

Turning the control clock-wise will adjust the screen to the left and counter

clock-wise will adjust the screen to the right.

2-6 VERTICAL-SIZE CONTROL

To adjust vertical size for all modes: turn the control clock-wise or counter

clock-wise until a suitable height is achieved.

2-7 FOCUS CONTROL

The focus control can be adjusted for optimum focus.

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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 and 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 operation 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 tests should be part of the routine safety check made by

the service technician.

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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 split into the display.

(b) If the display has been exposed to rain or water.

(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.

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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: cross hatch

(b) set up external brightness and contrast VR to central position

D909 negative point, negative leader to ground.

4-2 Vertical Linearity adjustment:

(a) test pattern: cross hatch

(b) set up external brightness and contrast VR to central position

centre.

4-3 Horizontal-hold adjustment

(a) test pattern: cross hatch

(b) set up external brightness and contrast VR to central position

(d) adjust VR402 to make pattern upright.

4-4 Geometric distortion pattern adjustment:

(a) test pattern: cross hatch

(b) set up external brightness and contrast VR to central position

best condition.

4-5 Video centering adjustment:

(a) test pattern: cross hatch

(b) the video is centered by rotating the two small rotary controls at the

rear of the yoke.

4-6 Horizontal-width adjustment:

(a) test pattern: cross hatch

(b) set up external brightness and contrast VR to central position

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4-7 Vertical height adjustment

(a) test pattern: cross hatch

(b) set up external brightness and contrast VR to central position.

4-8 Vertical-hold (Free-run 52Hz) adjustment:

(a) disconnect video signal

(b) use frequency counter ⊕leader, measure vertical yoke point,

adjustment VR303 make frequency value to 52Hz.

4-9 Raster adjustment:

(a) disconnect video signal

(b) set up external brightness VR to maximum, external contrast VR to

maximum.

4-10 Brightness check:

(a) test pattern: full white

(b) set up external brightness and contrast VR to maximum position

4-11 Focus adjustment:

(a) test pattern: “H” character pattern

(b) set up external brightness and contrast VR to central position

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