Sony Monitor Gdm F520 Manual
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GDM-F520(E) 1-4 1-4. BEZEL, H2 BOARD, MAGNETIC SENSOR REMOVAL 3Bezel 7Input selector 9H2 board 5Three screws (+BVTP 3 x 10) 4Screw (+BVTP 4 x 16) 10 Lifting up two claws in the direction of arrow. 4Screw (+BVTP 4 x 16) 11 L1 bracket 12 Magnetic MIU-221D sensor 2Four tapping screws (5) 8Menu button 6Control panel assembly CN1500 CN1401 CN1400 1 Picture tube shield Before removing the bezel assembly, secure the picture tube by attaching two screws to the picture tube shield at the positions shown with an arrow (diagonal two places) to prevent the picture tube from falling. (Use the screws +BVTT 4 x 8 that fix EMI shield.)
GDM-F520(E) 1-5 1-5. D BOARD REMOVAL A2 board (C block) Two screws (+BVTT 4 x 6) 4 Two screws (+BVTP 3 x 10) 3 Video block assembly Rear plate assembly 6 Five screws (+BVTP 3 x 10) CN315 CN1103 CN1600 CN1601 CN1003 CN605 CN701 CN501 GND CN602 CN601 CN318 GND Connector (4P) Connector (4P) 1 5 2 Screw (+BVTP 3 x 10) 4 D board 7
GDM-F520(E) 1-6 1-6. SERVICE POSITION 1 2 4 1 Remove the D board.D board 2Remove the Video block assembly.3Install the Adaptor board (XT MOUNT) (A-1391-123-A).4Lay the Video block assembly. Video block assembly Video block assembly 5Install the video block assembly. 6Put a box which is about 15cm in height under the D board to fix it. D board Box 3
GDM-F520(E) 1-7 1-7. PICTURE TUBE REMOVAL 4 Picture tube 1 Anode cap (Refer to page 1-8) 2 A2 board (C block) 3 Neck assembly CN3 CN7CN2 CN1 GND
CPD-G520(E) 1-8 3When one side of the rubber cap is separated from the anode button, the anode-cap can be removed by turning up the rubber cap and pulling up it in the direction of the arrow c. •HOW TO HANDLE AN ANODE-CAP1 Don’t scratch the surface of anode-caps with sharp shaped material! 2 Don’t press the rubber hardly not to damage inside of anode- caps! A material fitting called as shatter-hook terminal is built in the rubber. 3 Don’t turn the foot of rubber over hardly! The shatter-hook terminal will stick out or damage the rubber.• REMOVAL OF ANODE-CAPNOTE: Short circuit the anode of the picture tube and the anode cap to the met\ al chassis, CRT shield or carbon painted on the CRT, after removing the anode.•REMOVING PROCEDURES1 Turn up one side of the rubber cap in the direction indicated by the arrow a. 2 Using a thumb pull up the rubber cap firmly in the direction indicated by the arrow b. a b c Anode Button
GDM-F520(E) 1-9 1-8. HARNESS LOCATION CN602 CN601CN604 CN1102 CN312 CN311 CN318 CN319 CN320 CN316 CN315 CN303 CN1103 CN1003 CN1401 CN1500 CN1400 CN605 CN1600 CN1 CN1 CN3 CN1602 CN701 CN501 4P 4P5P CN904 CN2601 Picture tube A2 board AC inlet D board US board Magnetic sensor L2 board N board H2 board CN1601
GDM-F520(E) 2-1 SECTION 2 SAFETY RELATED ADJUSTMENT HV Regulator Circuit CheckHV Protector Circuit CheckBeam Current Protector Circuit Check When replacing or repairing the shown below table, the following operational checks must be performed as a safety precaution against X-ra\ ys emissions from the unit. Part Replaced ( [) RV901 HV ADJ * Confirm one minute after turning on the power. Part Replaced ( ]) D Board C925, IC901, R901, R902, R905, R924, R925, R926, RV901, T901 (FBT)• Mounted D Board D Board C920, C923, D911, D912, R903, R917, R918, R919, R920, R923, T901 (FBT) • Mounted D Board N Board IC1001, RB1001• Mounted N Board D Board C930, D917, R921, R932, R933, R935, T901 (FBT) • Mounted D Board N Board IC1001, RB1001 • Mounted N Board a) HV Regulator Circuit Check1) Turn the RV901 slowly, and adjustment so that high voltage is in thespecified range. [Specification]: 27.00 ± 0.05 kV 2) Check that the voltage of D912 cathode on the D board is 17.0 V or more. b) HV Protector Circuit Check 1) Using external DC Power Supply, apply the voltage shown belowbetween cathode of D912 and GND, and check that the RASTER disappers. [Specification]: 19.95 + 0.00/– 0.05 V c) Beam Current Protector Circuit Check 1) Connect constant current source to a section between T901 (FBT) qa pin and GND, and check that the RASTER disappers when the specified current flows to the qa pin. [Specification]: 2.12 + 0.00/– 0.01 mA
GDM-F520(E) 3-1 SECTION 3 ADJUSTMENTS Note: Hand degauss must be used on stand-by or power-off condition. This model has an automatic earth magnetism correction function by using\ an earth magnetism sensor and a LCC coil. When using a hand degauss while monitor (LCC coil) is being operated, \ it sometimes gets magnetized, and the system may not work properly as a result. • Landing Rough Adjustment1. Display all white pattern (or black dot pattern). 2. Set contrast to 255. 3. Display green plain pattern. 4. Side back DY and roughly adjust green plain pattern to be centered on the useful screen with Purity Magnet. 5. Adjust DY tilt. Note: Set ROTATION to 128 and LCC_NS to 128 when adjusting DY tilt. 6. LIghtly tighten the DY screw.• Landing Fine AdjustmentNote: (1) After adjust W/B (9300k), measure the average of IK with all white video input, while CONTRAST is maximum and BRIGHTNESS is center. And adjustment shall be made so that the miss-landing become least after aging 2H with the IK 30% of measured value shown above. (2) The magnetic field shall be BH = 0. (3) When adjusting at other than BH = 0, calculate the shifted value from BH = 0. 1. Put the monitor in helmholz coil. 2. Set as follows; LCC_SW = 0 (LCC Correction Current = 0) FUNCTION_SW bit1 = (Auto Degauss = On) CONTRAST = 255 3. Display green plain pattern. 4. Degauss the iron part of chassis with a hand degausser and degauss coil.\ 5. Degauss CRT face with a hand degausser again. 6. Input AC 230V to AC IN and turn the monitor off and on. Then auto- degauss works. 7. Reset FUNCTION_SW bit1 to 0 (auto-degauss = off) 8. Degauss CRT face with a hand degausser again. 9. Attach wobbling coil to the specified place on CRT neck. 10. Put on landing sensor to CRT face. 11. Set LCC_SW to 12. 12. With landing checker, adjust DY position, purity, DY center and landing of the 4 corners. 13. Read VX and VY value which are the read out of magnetic sensor, and write to LCC_VX_REF and LCC_VY_REF.
GDM-F520(E) 3-2 ± 6 ± 6 ± 6 ± 6 ± 6 ± 6 ± 6 ± 6 ± 6 (µm) 10 10 10 10 7 10 10 10 10(µm) The red and blue must be within the specification given right with re- spect to the green. A difference between red and blue must be within the specification given right. Adjust so that the green is within the specification given right. 4 corner adjust target : within ± 1 0 ± 3 0 ± 7.5 0 ± 3 0 ± 3 0 ± 7.5 0 ± 3 0 ± 3 0 ± 7.5 0 ± 3 (µm) 14. Adjust landing by LCC_NS, LCC_LT, LCC_LB, LCC_RT, and LCC_RB. Adjustment of registers shall be limited within the following range. LCC_NS: 128 ± 15 LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40 a b cd Green plain crosshatch pattern a and b should be equal. c and d should be equal. Plaster RTV to both sides for the upper wedge. Make sure that they settle inside DY. Plaster RTV to one side for other wedges. Set LCC_SW to 13, and Perform Service Save. 15. Tighten DY screw within specified torque, and auto-degauss. Note: Torque 22 ± 2 kgcm (2.2 ± 0.2Nm) 16. Adjust the vertical angle of DY to make top and bottom pins equal (a = b). The horizontal angle shall not be changed (straight). Settle DY upright without leaning, and insert wedges firmly so that DY shall not move. 17. Adjust top and bottom pins correction VR. 18. Adjust the horizontal trapezoid distortion by DY horizontal trapezoid correction VR.
GDM-F520(E) 3-3 19. Check landing at each corner and in case not in specification, adjustlanding of 4 corners with LCC_NS, LCC_LT, LCC_LB, LCC_RT, and LCC_RB. The limitations of registers are shown below. LCC_NS: 128 ± 15 LCC_LT, LCC_LB, LCC_RT, and LCC_RB: 128 ± 40 20. Remove the sensor and wobbling coil. 21. Switch signals to R, G, and B, and then check that the pure colors have good color purity. 22. Fix purity magnets with white paint.