Toshiba 32HFX72 service manual Circuit Checks, High Voltage Check, FS Circuit Check, Yes

Page 15

CIRCUIT CHECKS

HIGH VOLTAGE CHECK

CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on this chassis. Checking should be done following the steps below.

1.Connect an accurate high voltage meter to the second an- ode of the picture tube.

2.Turn on the receiver. Set the BRIGHTNESS and CON- TRAST controls to minimum (zero beam current).

3.High voltage must be measured below (B) kV.

Refer to table-1 for high voltage (B).

(See SETTING & ADJUSTING DATA on page 14)

4.Vary the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit under any con- ditions.

FS CIRCUIT CHECK

The Fail Safe (FS) circuit check is indispensable for the final check in servicing. Checking should be done following the steps below.

1.Turn the receiver on and press the RESET button.

2.Temporarily short TP-(R) and TP-(X) with a jumper wire. Raster and sound will disappear.

3.The receiver must remain in this state even after removing the jumper wire. This is the evidence that the FS circuit is functioning properly.

4.To obtain a picture again, temporarily turn the receiver off and allow the FS circuit more than 5 seconds to reset. Then turn the power switch on to produce a normal pic- ture.

Troubleshooting Guide for Fail Safe Circuit

Check that the set returns to normal operation when pin 12 of Z801(or emitter of Q472) is grounded with jumper wire.

 

YES

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the voltage across

 

Faulty power

Capacitor C471 is

 

circuit or hori-

approximately (C) volts.

 

zontal circuit.

 

 

 

 

 

 

 

Refer to table –4 for

 

 

 

 

 

 

 

 

Fail safe det. voltage (C).

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

(See SETTING & ADJUSTING

 

 

 

 

 

 

 

 

 

 

DATA on page14)

 

 

 

 

 

 

 

 

 

 

 

NO

Defective Fail Safe Circuit

SPECIFIC INFORMATIONS GENERAL ADJUSTMENTS

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Contents 32HF72, 32HFX72 Toshiba Corporation 36HFX72, 36HF72 Table of Contents Product Safety Notice General Adjustments Safety InstructionsRAY Radiation Precaution Safety PrecautionRubber Wedges SET-UP AdjustmentColor Purity Adjustment Deflection Yoke PURITY/ Conv MagnetSCREEN-CORNER Convergence Convergence Adjustments Center Convergence AdjustmentBLU RED RED/BLUE GRN GRNCenter Convergence SET-UP Adjustment for Flat TubeConvergence Adjustments Color Purity AdustmentInformations Circumference ConvergenceKEY Function in the Service Mode Service ModeEntering to Service Mode Displaying the Adjustment MenuTest Signal Selection Selecting the Adjusting ItemsAdjusting the Data Exit from Service ModeSync Self Diagnostic FunctionSelf Check BUS Line OK BUS Cont OKAdjustment Procedure Electrical AdjustmentsHpos Parabola DPCPara Horizontal PositionYES Circuit ChecksHigh Voltage Check FS Circuit CheckOption Progressive 43 DV Specific Informations Setting & Adjusting DataSafety Instructions Service Mode Adjusting Items and Datas in the Service ModeLocation of Controls Representatives 36HFX72 Remote Control TV/CABLE function Programming Channel MemoryOMF Chassis and Cabinet Replacement Parts ListELECTROLYTIC, 16V 22UF M 3A ELECTROLYTIC, 160V 330UF M 3D Plastic FILM, 50V 0.01MF J Resistors CHIP, Metal FILM, 1/20W 7.5K OHM J Carbon FILM, 1/6W 75 OHM J Carbon FILM, 1/6W 820 OHM J Carbon FILM, 1/6W 1M OHM J 36HFX72 Coils & Transformers Semiconductors IC, PQ30RV1 DIODE, EU2A Miscellaneous Picture Tube Bottom Foil Side Signal Board PD0650POWER/DEF Board PD0159 CRT-D/VM Board PD0164 LOW B Board PB9567 AC in Board PD0161CONTROL-1 Board PD0651 CONTROL-2 Board PD0652 WOW Board PD0645 Terminal View of Transistors Schematic Diagram Structure Signalunit DiagramDimensions Power SourcePower Consumption Audio PowerToshiba Corporation Schematic Diagram Diagram Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page