Tatung VM-14AF User manual

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VM-14AF

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

14” Mono Chrome Monitor

CRT SIZE : 14” 90 DEGREES

PHOSPHOR : H68AU

FACEPLATE : NON-GLARE

SCAN FREQ : HOR. 31.5 KHz, 35.5 KHz, 35.2 KHz, 38 KHz

VER. 40 – 75 Hz

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

BANDWIDTH : 26 MHz, 35 MHz, 45 MHz

VIDEO SIGNAL : ANALOG R.G.B. INPUT, 1 Vp-p MAX

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

INPUT CONNECTOR : 15 PIN D SHELL

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

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

POWER CONSUMPTION: 33W MAX

DIMENSION : 385W x 370H x 385D mm

NET WEIGHT : 7.5 Kg

SAFETY : UL, CSA, DHHS, CE (LVD)

EMI : FCC – B, CE (EMC)

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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 is lit 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

Turn the control clock-wise to adjust the screen to the left and counter

clock-wise to 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.

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3 IMPORTANT SAFEGUARDS

For your own safety read all instructions and retain them for further

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 only fit into the power outlet of compatible configuration.

Contact your technician to replace an 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 as they may

come into contact with 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 a service technician should perform

routine safety tests to determine that all the equipment are 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.

This is the case 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 routine safety

check carried out by a service technician.

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3-5 INSTALLATION

Do not place the display on an unstable cart, stand or shelf where it may

fall and injure personnel or cause damage to the equipment. Install the

unit on a solid firm base whenever possible.

Route the power cord and all cables so they will not be walked on or

tripped over. Do not allow anything to rest on the power cord.

Do not install this display in wet areas or wherever it may be exposed to

rain or water. Do not spill liquid of any kind on the unit.

3-6 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.

3-7 SERVICING

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.

(a) If liquid has been spilt into the display.

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

(d) If fuse 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

test D913 negative point, negative lead to ground.

4-2 Vertical linearity adjustment:

(a) Test pattern: cross hatch

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

bottom-centre.

4-3 Horizontal-hold adjustment:

(a) Test pattern: cross hatch

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

(d) Adjust VR400 to make pattern upright.

4-4 Geometric distortion pattern adjustment:

(a) Test pattern: cross hatch

(b) Set up external brightness and control 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 magnetic rings 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

4-7 Vertical height adjustment:

(a) Test pattern: cross hatch

(b) Set up external brightness and contrast VT to central position

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

(a) Disconnect video signal

(b) Use frequency counter O lead, measure vertical yoke point,

adjustment VR302 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

distinguished.

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