Happ Vision Pro MTG-1901CN, 49-1329-VP2, Vision Pro MTG-1301CN, 49-1345-VP2 Service And Operation Manual

SERVICE AND OPERATION MANUAL

MTG-XX01 SERIES (13”,19”) CGA

OPEN FRAME COLOR MONITORS

19”: 49 - 1329 - VP2
13”: 49 - 1345 - VP2

MTG-XXO1 Publication A, Issue 1

Information in this publication cur rent as of June, 2003.

Information subject to change as display technology advances.

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This monitor has been designed and manufactured to deliver high performance video. For continued peak

performance use and safe operation, it is recommended to use only high quality Happ Controls replacement parts

or their exact specified equivalent when servicing.

SAFETY PRECAUTIONS AND WARNI NGS

Service Warning

The display contains HIGH VOLTAGE capable of

delivering LETHAL levels of energy. Service should

only be attempted by trained personnel familiar with

the potential dangers inherent with high voltage

equipment.

Safety Related Component Warning

Certain components used in Happ Controls color

monitors are critical for safe operation of the display.

These part numbers are marked by () on the

schematic diagram. It is essential that these safety

critical components be replaced only with exact

manufacturer specified components to prevent the

possibility of excessive X-radiation emission, electrical

shock, fire or premature component failure. Modifying

the original design without written approval from Happ

Controls is expressly forbidden, will void the original

parts and labor warranty, and may result in creating a

hazardous situation.

X-Radiation Warning

COMPONENTS WHICH MAY AFFECT POTENTIAL

EXCESS EMMISSION OF X-RADIATION IN THE

HORIZONTAL DEFLECTION AND HIGH VOLTAGE

CIRCUITS(INCLUDING THE PICTURE TUBE) ARE

INDICATED ON THE SCHEMATIC DIAGRAM BY

A(★).

USE ONLY TYPE AND RATING OF REPLACEMENT

COMPONENT AS SHOWN IN THE PARTS LIST.

1. The only potential source of X-radiation emission
is the picture tube. When the high voltage and
horizontal deflection circuits are operating correc tly
there is no possibility of excess X- radiation
emission. NEVER attempt to modify these circuits.

2. Periodically check the high voltage with a reliably
calibrated meter for values no tin excess of
manufacture recommendations.

See High Voltage

Shut-down Circuit, page 4 for further details.

CRT Warning

All picture tubes used in Happ Controls monitors are

quipped with an integral implosion protection system.

The picture tube is, however, a highly evacuated

component which outside surfaces are subject to

strong external forces. Care must be exercised so as

not to bump or scratch the tube during installation or

servicing as this may cause the tube to implode,

resulting in possible personal injury and property

damage. Shatter-proof goggles must be worn by

individuals while handling the CRT or installing the

display in the cabinet. Do not handle the CRT by neck.

1. Always ensure the high voltage at the anode cap
is fully discharged prior to handling or service.

2. Replace picture tube only with same type and
number.

Product Safety and Service Guidelines

1. Service should be performed only after reading

all of the warnings and precautions in the manual
and as labeled on the CRT and chassis.

2. Where a short circuit has occurred, replace all

components that indicate evidence of overheating.
Also check for evidence of overheating or poor
connection on all plastic connectors.

3. Inspect wiring for frayed leads and damaged

insulation. When service is required, observe
original lead dress, assume lead dress is followed
as from the factory, especially in the high voltage
circuitry area.

4.

Do not expose this display to rain or place in areas
where the potential for exposure tomoisture is high.

Additionally, do not mount the removed

VR PCB if
so equipped outside the cabinet or in areas where
there is a possibility of exposure to moisture.

5. All protective devices must be reinstalled per
original design.

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1. Power Supply

This color monitor shall maintain the spec

ified

performance in the range described below.

Frequency : 47Hz ～ 63Hz

Vol

tage : 90VAC-264VAC

Consumption : Less t

han 70Watts

2. Input Signal

The referenced video controller used for adjustment

and test will guarantee

the performance described

below.

Video signals

Red, Green, Blue analog input

150Ωtermination to ground

Level : 0 to 2.4Vp-p

Polarity : Positive

Sync signals

Separate H/V sync input

10k termination to ground

Level : TTL level

Polarity : Positive or Negative

3. HorizontalDeflection

Scanning Frequency : Nominal (15-17.5kHz)

Retrace period : 〈 11.5us

4. Vertical Deflection

Scanning Frequency : Nominal (50-65Hz)

Retrace period : 〈 900us

5. Linearity

±5%

6. Picture Size Regulation

Static Regulation 2%

Dynamic Regulation 1.5%

7. Geometric Distortion

It is acceptable that pincushion, trapezoid, paralle-

logram, barrel distortion, out of orthogonality and

various waves can

appear all together. If the data

area parameter remains within the limits of 2%.

8. Degaussing

This color monitor

shall employ an automatic

degaussing circuit, The degaussing sequence

shall be self activated at the time of switch-on.

After a degaussing cycle, the demagnetizing circuit

shall recover.

9. High Voltage

This color monitor shall employ an X-radiation

shut-down protection with internal circulitry.

13" : 26KV

19" : 27KV

10. Environmental Conditions

Temperature : 10 ~ 55℃ (Operating)

Humidity : 10 ~ 90%, no condensation

1. Apply line AC,90V-264V, in your locality to the

monitor through W801.

2. Apply signal source to the monitor through W301.

3. Set up user adjustable controls.

All controls are preset at the factory for optimum

performance. If adjustment is necessary to suit

program material, most adjustments can be made

using o nly the controls on the remove VR PCB.

Other controls in the monitor should be adjusted

only if those controls have been tampered with or if

major repairs were necessary on the monitor.

PERFORMANCE AND OPERATING DATA

OPERAT ING INSTRUTIONS

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1. Remote VR PCB

Contrast, VR720

Brightness, VR721

H-Pos

ition, VR722

H-Size, VR723

V-Size, VR724

V-Position, VR725

2. Main PCB

Horizontal OSC, VR301

V-HOLD, VR303

V-LIN, VR302

3. Flyback Transformer

Focus Adjustment

Screen Ad justment

4. Neck PCB

Red Cut-off, VR552

Red Gain, VR551

Green Cut-of

f, VR555

Green Gain, VR553

Blue Cut-off, VR554

Blue Gain, VR556

These controls in main, neck PCB and flyback transformer have been preset and sealed at the factory

and should not require further attention.

The chassis of this color monitor has been

designed to emit a minimum of soft X-radiation,

in accordance with US DHHS rules 21 CFR,

subchapter J, applicable at date of manufacture

A high voltage shut-down circuit, as shown

below, guarantees hor izontal oscillation shut-

down.

A flyback pulse is generated at pin 10 of flyback

transformer. This pulse is fed through a

resistive divider network to pin 13 of I301.

The voltage appearing on pin 13 is compared

with a precise internal voltage in the IC should

the EHT exceed 28KV the change in voltage on

pin 13 actuates a circuit which inhibits the

oscilator and consequently the EHT circuit.

The c ircuit continues to inhibit the oscillator

until the fault condition is corrected, and even

then the monitor has to be switched off and on

cillator cable is re-activated.

HIGH VOLTAGE SHUT-DOWN CIRCUIT

CONTROLS