NEC MultiSync FE750 Guide de l'administrateur

COLOR MONITOR MultiSync!

!FE750

MODELS FE750 (A) / (B) /(R)

NEC Corporation 200003

08109353

08109354

08109355

SCHEMATIC DIAGRAMS

PART NO. 599910513

WARNING

The SERVICE PERSONNEL should have the appropriate technical training, knowledge and experience

necessary to:

･Be familiar with specialized test equipment, and

･Be careful to follow all safety procedures associated with high voltage CRT circuit designs to minimize

danger to themselves and their coworkers.

To avoid electrical shocks, this equipment should be used with an appropriate power code and be

connected only to a properly grounded AC outlet.

This equipment utilized a micro-gap power switch. Turn off the set by first pushing the front panel

power switch. Next, remove the power cord from the AC outlet.

To prevent fire or shock hazards, do not expose this unit to rain or moisture.

This symbol warns the personnel that un-insulated voltage within the unit may have sufficient

magnitude to cause electric shock.

This symbol alerts the personnel that important literature concerning the operation and

maintenance of this unit has been included.

Therefore, it should be read carefully in order to avoid any problems.

PRODUCT SAFETY CAUTION

1. When parts replacement is required for servicing, always use the manufacturer's specified replacement.

2. Comply with all caution and safety-related notes on the product display chassis and picture tube.

3. When replacing the component, always be certain that all the components are put back in the place.

4. When servicing display monitor unit, it is required that the provided lead dress is used in the high voltage

circuit area.

5. It is also recommended that shatter proof goggles are worn, when removing installing and handling the

picture tube. People not equipped with the proper precautionary measures mentioned should keep the

picture tube away from body while handling.

6. As for a connector, pick and extract housing with fingers properly since a disconnection and improper

contacts may occur, when wires of the connector are led.

7. Use a proper screwdriver. If you use screwdriver that does not fit, you may damage the screws.

8. X-radiation precaution

This product contains critical electrical and mechanical parts essential for X-ray protection.

Normal anode voltage is 25.0 kV at zero beam picture tube current under AC 100-120V/220-240V input,

and anode voltage must not exceed the voltages shown below under any operation condition.

To measure anode voltage set brightness for very dim picture, and use a high impedance volt meter

between chassis and anode lead and measure high voltage.

If high voltage exceeds the specifications on the chassis schematic diagram, take the necessary

corrective action.

Table MAXIMUM ANODE VOLTAGE

beam current at 0 mA at 0.7 mA at 1.4 mA

A/B/R 34.5 kV 32.5 kV 31.0 kV

9. When you degauss the set with an external degaussing coil, you must keep strictly item “ * Notes about

degaussing method ” of ADJUSTMENT PROCEDURES.

FE750

SCHEMATIC DIAGRAMS

CONTENTS

PageNo.

MAIN PWB (1/4) SCHEMATIC DIAGRAM .................................................................. 1

MAIN PWB (2/4) PWB SCHEMATIC DIAGRAM ......................................................... 2

MAIN PWB (3/4) PWB SCHEMATIC DIAGRAM ......................................................... 3

MAIN PWB (4/4) SCHEMATIC DIAGRAM ................................................................... 4

SUB PWB SCHEMATIC DIAGRAM ............................................................................. 5

CRT PWB SCHEMATIC DIAGRAM ............................................................................. 6

OSC PWB SCHEMATIC DIAGRAM ............................................................................. 7

CONTROL PWB SCHEMATIC DIAGRAM .................................................................... 8

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