Sony KP-43T75A, KP-53SV75A service manual Section Safety Related Adjustments

Page 39

[ G BOARD]

KP-43T75A/53SV75A

RM-Y906 RM-Y906

SECTION 4

SAFETY RELATED ADJUSTMENTS

4-1. HV REGULATION CIRCUIT CHECK AND ADJUSTMENT

When replacing the following components marked with

on the schematic diagram always check HV regulation, and if necessary re-adjust.

: C517

: C517, C521, C522

IC654, L504

T502, T504 (FBT)

D.Y, A board, G board

OPERATION CHECK

1. Connect a HV static voltmeter to the unconnected plug of the high-voltage block. (Fig.4-1)

2. Power on the set.

3. Receive the dot signal. (PICTURE and BRIGHTNESS to minimum)

4. Check that the HV static voltmeter is reading 31.00 +0.95 kVdc.

-1.45

HV Regulation adjustment

1.Connect a HV static voltmeter to the unconnected plug of the hight-voltage block.

2.Power on the set.

3.Receive the dot signal. (PICTURE and BRIGHTNESS to minimum)

4.If anode voltage is 31.95kV or higher, replace C517 of 470PF/ 2kV with that of 680PF/2kV, and check if the voltage is within the standard range.

5.If anode voltage is 29.66kV or lower, replace C517 of 470PF/ 2kV with that of 100PF/2kV, and check if the voltage is within the standard range.

Remove the cap off from the unused terminal and cpmmect a static voltmeter there.

Fig. 4-1

4-2. HV HOLD DOWN CIRCUIT OPERATION CHECK AND ADJUSTMENT

When replacing the following components marked with

on the schematic diagram always check hold-down voltage and if necessary re-adjust.

: R536, R545

: C516, C536

D506, D507, D522

IC206, IC502, IC654

L504, R511, R522, R536, R538, R545,

R548, R584

T502, T504 (FBT)

D.Y, A board, G board

OPERATION CHECK

1.Remove CN652 connecter.

2.Short-circuit across TP-PROT and ground.

3.Connect a HV static voltmeter to the unconnected plug of the high-voltage block.

4.Connect a 220Ω / 200W variable resistor, across pin 2 and pin 1 of CN652 and connect an external dc power supply unit (200V, class 2A) to pin 3 of CN652.

5.First turn on the external power supply (+B=135V), then turn on the power of the set.

6.Receive the dot signal. (PICTURE and BRIGHTNESS to minimum)

7.Gradually increase the value of the external dc power supply

and check that the hold-down circuit operates at a static voltmeter reading of 33.5± 0.95kVdc when the raster

disappears.

HV HOLD-DOWN ADJUSTMENT

1.Repeat steps 1 ~ 7 as above.

2.If hold down voltage is 34.45kV or higher, remove R536, mount a resistor (150kΩ , 1/4W : RN) onto R545 instead, and

check again if the hold-down voltage is within the standard range.

3.If hold down voltage is 32.55kV or lower, mount a resistor (220kΩ , 1/4W : RN) onto R536 and check again if the hold-

down voltage is within the standard range.

NOTE : Please finish the adjustment as soon as possible

4-3. +B MAX VOLTAGE CONFIRMATION

The following adjustments should always be performed when replacing IC654.

1.Supply 130VAC to with variable autotransformer.

2.Input a dot signal.

3.Set the PICTURE control and the BRIGHTNESS controls to minimum.

4.Confirm the voltage of G BOARD TP135V is less than 137.0Vdc.

5.If step 4 is not satisfied, replace IC654 and repeat above steps.

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Contents Color Rear Video Projector KP-43T75A/53SV75A SpecificationsDiagnosis Items and Prediction of Malfunction Location Blinking count display of TIMER/STAVDBY indicatorSelf Diagnosis Function Summary of Self-Diagnosis FunctionSelf-Diagnosis Screen Display Self-diagnosis screen displaysSelf-diagnosis block diagram Self-diagnosis function operationOVP Detect SET-UP Adjustments Table of ContentsCircuit Adjustments DisassemblySection General Remote ControlCarrying Your Projection TV Installing the Projection TV Making Connections Connector TypesConnecting a cable TV system/ antenna to a VCR Connecting a VCR and projection TV to a cable boxConnecting a camcorder Connecting a DVD Player Upper illustration Connecting two VCRs for tape editingInserting the batteries Using the Remote ControlSetting Up the Projection TV Automatically Connecting an audio system Upper illustrationTo perform Auto SET UP again Adjusting the Convergence Automatically Flash FocusWatching the TV Watching Two Programs at One Time PIP To exit from the menus at any time Learning Menu SelectionTo select the Video menu Using the Video MenuUsing the Audio Menu To restore the factory settingsTo select the Reloj menu Using the Reloj MenuTo select the Ajustes de canal ch menu Ch Using the Ajustes de canal MenuChanging Canal favorito choices Setting and Selecting Canal favoritoSetting Canal favorito manually Using Canal favoritoTo select the Ajustes menu Using the Ajustes MenuSetting the Manufacturers Code Manufacturer code numbers cable box To operate the cable boxTo operate the projection TV No color KP-53SV75A Section DisassemblyRear Board Removal Service Position HA Board and HB Board Removal Chassis Assy RemovalKP-43T75A HA, HB and FB Board Removal Mirror Cover RemovalA, G and FA Boards Removal HIGH-VOLTAGE Cable Installation RemovalPicture Tube Removal Section SET-UP AdjustmentsDefocus Adjustment Blue Focus VR AdjustmentPole Magnet Adjustment GREEN,RED Pole Magnet AdjustmentElectrical Adjustment by Remote Commander Adjusting Buttons and IndicatorData Adjustment Data Standard Number Range Service Mode ListKP- RM Adjustment Data Standard NumberDAC D/A Converter CCD Closed Caption Decoder Setup for Adjustment Registration Adjustment PJEGreen Center Green Registration AdjustmentRED Registration Adjustment Blue Registration AdjustmentFinal Check Error Code List Auto Registration Error Code ListSection Safety Related Adjustments +B OVP Confirmation PIP SUB Contrast Adjustment SC-SYDR Section Circuit AdjustmentsTV Input SUB Contrast Adjustment VPTR-GDRV TV Input SUB-HUE and SUB-COLOR Adjustment VPTR-SHUE, ScolBAR Display Position Adjustment OP-DISP PIP Position Adjustment PI-PIPH, PIPV, PPH5, PPV5Text Position Adjustment CCD-CCHP Block Diagram Section DiagramsLine Video IC805 PJED-CPU ResetPeak Hold BuffTo a CRR DrivePower Supply G H/V OUT Micro Inductor Frame Schematic DiagramPrinted Wiring Boards and Schematic Diagrams Circuit Boards Location3 Board Waveforms 3 Board IC406 TDA72653 Board IC1011 CXA2079Q BV DAC 3 Board IC807, 815, 816 ∝ PD6376GS-E2? a 2/3 board 3 Board IC1904 CXA1315M-T4 Board3 Board IC1902 CXA2019AQ-T4 3 Board IC1903 BU4053BCF-T2Board Waveforms Board IC654 DM-58Board IC651 ∝ PC393C CG CR CB board CG Board CB Board Waveform CR Board WaveformCB Board CG Board WaveformsFunction Keys HA Board HC BoardHB Board FA Board FB Board FB Power SwitchNJM7805FA SemiconductorsD1NL20U Cover KP-43T75A Section Exploded ViewsREF. NO. Part no Description Remark REF. no Cover KP-53SV75AChassis KP-43T75A 152 113 115Chassis KP-53SV75A Picture Tube 212Section Electrical Parts List ResistorsCapacitors PF ∝∝ F 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 HC HA HB S 125 965-413-01
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