NEC MultiSync FE750 Guida per l'amministratore
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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