Panasonic CT-32SX31E, CT-36SX31E Service Adjustments Electronic Controls, Sub-Contrast Adjustment

Page 27

Service Adjustments (Electronic Controls)

Sub-Contrast Adjustment

Serviceman DAC Adjustment (B02, B03)

This adjustment is factory set. Do not adjust unless repairs are made to associated circuit, the CRT Board or when the CRT is replaced.

Preparation:

1.Apply a Black-White pattern.

2.Set the picture settings to normal and color to minimum.

3.RGB GAMMA (S03) DAC from 1 to 0

4.Connect the oscilloscope to TP47R.

5.Connect a jumper from TPD2 to cold ground ( ).

Procedure:

1.In the Serviceman Mode, select DAC B2 for Sub- Brightness to obtain 2.6±0.1V between 7.5IRE and GND level at TP47R (See Fig. 25)

2.In the Serviceman Mode, select DAC B03 for Sub- Contrast to obtain 1.5±0.1V between 7.5IRE and 100IRE level at TP47G

3.Remove short jumper and set RGB GAMMA (S03) DAC to 1.

4.Set the picture settings to normal.

.

100IRE

1.5±0.1V

7.5IRE

2.6 v± 0.1V

GND

Figure 25. waveform

Sub-Brightness (B02)

Adjustment of this control is important for setting proper operation of customer brightness and picture controls. Do not adjust the SCREEN VR after the Sub- Brightness is set.

Preparation:

1.Normalize picture settings.

2.Switch COLOR TEMPERATURE to NORMAL.

Procedure:

1.Apply a black white cross pattern.

2.In the Serviceman Mode for making electronic adjustments, select the DAC adjustment (B02) and adjust data so that 7.5IRE part is the same light output as the 3IRE part (See Fig. 26).

3 IRE

 

7.5 IRE

 

Figure 26.

Pattern

Tint/Color Adjustment

Serviceman DAC Adjustment (B01) (B00) Preparation:

1.Apply a rainbow color bar signal.

2.Preset the following controls:

•Brightness . . . . . . . Min.

•Color . . . . . . . . . . . . Center.

•Tint . . . . . . . . . . . . . Center.

•Picture . . . . . . . . . . . Max.

•Sharpness . . . . . . . . Min.

3.Set RGB GAMMA (S03) DAC to 0

4.Connect the oscilloscope to TP47B (A-Board).

5.Connect a jumper from TPD2 to GND ().

Procedure:

1.In the Serviceman Mode for making electronic adjustments, select (B01) DAC Sub-Tint Adjustment. Adjust until the waveform measured is as the one shown in Fig. 27.

TP47B (A-Board)

C

A

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 2 3

10

A to B = 1 unit

4 5 6 7 8 9

 

A to C = 2 units

 

Figure 27. TP47B waveform

2.Connect the oscilloscope to TP47G or TP35 (L- Board) and cold GND.

3.Select DAC Sub-Color Adjustment (B00) and adjust for peak to peak amplitude to be 0.50Vp-p ±0.05V as shown in Fig .28.

TP47G (A-Board)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

6

 

 

 

 

 

 

 

 

 

 

0.50Vp-p±0.05V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

8

9

10

 

 

 

 

Figure 28. TP47G waveform

4.Remove short jumper and set RGB GAMMA (S03) DAC to 1.

PIP Sub-Contrast Adjustment (P03)

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Contents NA8ML Main ManualImportant Safety Notice Schematics, Voltages and waveforms Leadless Chip Component surface mount Service NotesChip Component Installation How to Replace Flat-ICHorizontal Oscillator Disable Circuit ProcedurePreparation Receiver Features Controls Inside Remote Control SensorLocation of Controls Receiver Quick Reference Control OperationLocation of Controls Remote Disassembly for Service Important Notice Left corner Screw Back Cover RemovalScrews at top edge Screw by Antenna jacks Screw at lower Right cornerHigh Voltage Check Chassis Service Adjustment ProceduresSource Voltage Chart 140.0V B+ Voltage ConfirmationPurity and Convergence Procedure When the CRT or the Yoke is ReplacedVertical Raster Shift Adjustment Only for Service Adjustments Electronic Controls procedure Purity AdjustmentFinal Convergence Procedure see Fig Dynamic Corvergence AdjustmentPermalloy Convergence Corrector Strip Part No FMK014ZZ XV Adjustmentprecise adjustmentDAF Adjustment YH Adjustment VR2 for Vertical dynamic convergenceConvergence Magnets and Wedges Location Exiting the Serviceman Mode Serviceman Mode Electronic ControlsQuick Entry to Serviceman Mode To toggle between Aging and Serviceman modesPress Channel Up/Down on For AdjustmentsPress Volume Up/Down on Remote Control to adjustMTS Adjustment Default Level Geometry Adjustments Default LevelPIP Adjustment Default Level Options Adjustment Default Level Option Adjustment Default Level Helpful Hints Entering Serviceman Mode Back-Open Method To Check PurityPress Recall again to select desired field Press Action + Volume Up Simultaneously on Receiver Instructional Flow Chart for Serviceman ModeCUT-OFF Adjustments PIP Adjustments PIP Sub-Contrast Adjustment P03 Service Adjustments Electronic ControlsSub-Contrast Adjustment Tint/Color Adjustment170±2V DC Color Temperature Adjustment B/W TrackingComplete Adjustment ±0.05V DCService Adjustments Electronic Controls, Stereo Separation Adjustment M01 & M02 Correction Adjustment D02MTS Circuit Adjustments Input Level Adjustment M00Service Adjustments Mechanical Controls Clock Adjustment S07Focus part of T551

CT-32SX31E, CT-36SX31E, CT-32SX31CE, CT-32SX31UE, CT-36SX31CE specifications

The Panasonic CT-36SX31UE, CT-36SX31CE, CT-32SX31UE, CT-32SX31CE, and CT-36SX31E are part of Panasonic's renowned line of CRT (cathode-ray tube) televisions designed to deliver excellent picture quality and robust performance. These models are known for their advanced features, making them a popular choice for home entertainment enthusiasts.

One of the key features of these televisions is their large screen sizes, with the CT-36SX31 models boasting a striking 36-inch display. The CT-32SX31 models, while slightly smaller at 32 inches, offer an equally immersive viewing experience. The screens are designed with high-resolution capabilities that enhance color depth and clarity, allowing viewers to enjoy a lifelike picture.

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Durability and reliability are characteristic of Panasonic products, and these models are no exception. Built with quality materials, they are designed to last, ensuring that consumers receive value for their investment.

In summary, the Panasonic CT-36SX31UE, CT-36SX31CE, CT-32SX31UE, CT-32SX31CE, and CT-36SX31E are standout CRT televisions renowned for their large screens, high-resolution image quality, excellent sound output, and robust connectivity options. While CRT technology has since transitioned to flat-panel displays, these models remain a testament to Panasonic's commitment to quality and performance in home entertainment.
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