Sony GDM-F500T9 service manual Section Safety Related Adjustment, + Voltage Check

Page 20

GDM-F500/F500T9

SECTION 3

SAFETY RELATED ADJUSTMENT

When replacing or repairing the shown below table, the

following operational checks must be performed as a

safety precaution against X-rays emissions from the unit.

 

Part Replaced (])

HV Regulator

G Board

IC901,

T901

 

Circuit Check

 

∙ Mounted G board

HV Protector

G Board

Q907,

Q908,

D913,

Circuit Check

 

D916,

C923,

R920,

 

 

R927,

R952,

T901

 

 

∙ Mounted G board

Beam Current

D Board

R011,

R1068

 

Protector Circuit

 

∙ Mounted D board

Check

G Board

IC901,

IC902,

Q907,

 

 

Q908,

D902,

D918,

 

 

D919,

R923,

R928,

 

 

R933,

R934,

R942,

 

 

R944,

R945,

R947,

 

 

R948,

R951,

R952,

 

 

T901

 

 

 

 

∙ Mounted G board

*Confirm one minute later turning on the power.

a)B+ Voltage Check

Check Condition

∙Input voltage : 100 ~ 240 VAC

∙ Input signal : White Cross Hatch at 120.7 kHz

∙Beam control : BRT and CONT → MAX

∙ Standard

: 200 ± 3.0 V DC

b)HV Regulator Circuit Check

1)Confirm that the voltage of the + side of C910 on G board is within the voltage range shown below. Standard: 8.940 ~ 9.065 V DC

c)HV Protector Circuit Check

1)Confirm that the voltage between cathode of D913 on G board and GND is more than 26.5 V DC.

2)Confirm that the HV protector circuit works and TV Raster disappears when apply the voltage as shown below between cathode of D913 and GND using an external DC power supply.

Check Condition

∙Input voltage : 100 ~ 240 VAC

∙ Input signal : White Cross Hatch at 120.7 kHz

∙Beam control : BRT and CONT → MIN

∙ Standard : Less than 34.20 V DC

d)Beam Current Protector Circuit Check-1

(Hardware)

Connect a variable resistor (20 kΩ or more) and an am- meter in series between pin !Á of T901 (FBT) and –15 V line. Decrease gradually the resistance of the vari- able resistor from maximum to minimum, and confirm that the Beam Current Protector Circuit works and TV Raster disappears. The current must be within the

range shown below. Check Condition

∙ Input signal : White Cross Hatch at 120.7 kHz

∙Beam control : BRT = 0, CONT = 0

∙ Standard

: 1.49 mA

e)Beam Current Protector Circuit Check-2 (Software)

1)Short between + of C937 and GND.

2)Connect a variable resistor (20 kΩ or more) and an ammeter in series between pin !Á of T901 (FBT) and –15 V line. Decrease gradually the resistance of the variable resistor from maximum to minimum, and confirm that the Beam Current Protector Circuit

works and TV Raster disappears. The current must be within the range shown below.

Check Condition

∙ Input signal : White Cross Hatch at 120.7 kHz

∙Beam control : BRT = 0, CONT = 0

∙ Standard

: 1.59 mA

3-1

Page 19 Page 21
Image 20
Page 19 Page 21
Contents GDM-F500/F500T9 Safety CHECK-OUT Leakage TestPower Saving Function To change the power saving delay timeTiming Specification Table of Contents Precautions SectionGeneral Identifying parts and controlsTurn on the monitor and computer Connect the power cordConnect your monitor to your computer Connecting Universal Serial Bus USB compliant peripherals Selecting the input signalSelecting the on-screen menu language Lang Automatically sizing and centering the pictureAdjusting the brightness and contrast Adjusting the size of the picture SizeNavigating the menu Picture CenterAdjusting the shape of the picture Geom Adjusting the color of the picture ColorAdjusting the quality of the picture Screen Enlarging or reducing the pictureAdditional settings Option Resetting the adjustmentsPreset and user modes If thin lines appear on your screen damper wiresTrouble symptoms and remedies Symptom Check these items Picture is ghostingIf the 1 power indicator is green Self-diagnosis functionBoard Removal Section DisassemblyCabinet Removal Screw + Bvtt 4 x Two screws + Bvtt 4 x Service Position H1, H2 and J Boards Removal US Board RemovalPicture Tube Removal GND DYHarness Location FBTSection Safety Related Adjustment + Voltage CheckAdjustments ∙ Landing Fine Adjustment∙ Convergence Rough Adjustment ModeSection Diagrams Block DiagramsPage Frame Schematic Diagram 5BNC Video AMP, RGB OUTBoard Component Side Schematic Diagrams and Printed Wiring BoardsCircuit Boards Location Focus Schematic diagrams 1/2 D 2/2 board JL boards lSTAT, H.STAT, LCC GEO Magnetic Sensor Power SupplySchematic diagram Board l Video AMP Videorgb Outamp Schematic diagram Us board l GND3US Board Conductor Side USB ControlF500 AEPS/N 2,801,281 and later Schematic diagram Semiconductors 2SC4686A Lbsony EGP10D EGP10GPKG23D2S4MF D2S4MTA1 FMQ-G5GS D5L60REF.NO. Part no Description Remark Exploded ViewsChassis Picture Tube Packing Materials Memo REF.NO Description Remark Part NO. Description ListREF.NO. Part NO. Description Remark REF.NO. Part no REF.NO Description Remark REF.NO DescriptionREF.NO Part NO. Description Remark CoilIC Link ResistorREF.NO Part NO. Description Spark GAP GAP, SparkSocket SOCKET, Picture TubePIN, Connector with PWB PIN, Connector PC Board 3PPLUG, Connector 12P PLUG, Connector 5PREF.NO Description Remark Replace only with part number specified Spring AA, TR Retainer Screw +BVTP 3X10 TYPE2 TTBMetal Relay2KV PLUG, Connector 9P PIN, Connector PC Board 6PPIN, Connector PC Board 10P PLUG, Connector 2PDiode MA111 COIL, Horizontal LinearityDiode 1SS184 Zener Diode DTZ5.1BR063 216-025-91 RES,CHIP 100 10W R001 REF.NO Part NO. Description TRANSFORMER, Ferrite HST SwitchTRANSFORMER, Ferrite HDT Metal Thermistor Switch SWITCH, Stick Cont +/-, BRT + Crystal ThermistorDiode SLR-325YCT31 Connector Transistor PIN, Connector PC Board 12PSensor Switch ConnectorSWITCH, Push AC Power US BOARD, Complete OLD US BOARD, Complete NEWCeramic Chip 0.1 F Ceramic Chip 0.01 FFB2913 Short C2916 10% 25V FB2914 NEW OLD OLD Transformer English 978-620-12
Top Page Image Contents