Service Notes (Continued)

IMPORTANT: To protect against possible damage to the solid state devices due to arcing or static discharge, make certain that all ground wires and CTR DAG wire are securely connected.

CAUTION: The power supply circuit is above earth ground and the chassis cannot be polarized. Use an isolation transformer when servicing the Receiver to avoid damage to the test equipment or to the chassis.

Connect the test equipment to the proper ground () or ( ) when servicing, or incorrect voltages will be measured.

WARNING: This Receiver has been designed to meet or exceed applicable safety and X-ray radiation protection as specified by government agencies and independent testing laboratories.

To maintain original product safety design standards relative to X-ray radiation and shock and fire hazard,

parts indicated with the symbol on the schematic must be replaced with identical parts. Order parts from the manufacturer’s parts center using the parts numbers shown in this service manual, or provide the chassis number and the part reference number.

For optimum performance and reliability, all other parts should be replaced with components of identical specification.

Horizontal Oscillator Disable Circuit

This chassis employs a special circuit to protect against excessive high voltage and beam current. If, for any reason, the high voltage and beam current exceed a predetermined level this protective circuit activates and detunes the horizontal oscillator that limits the high voltage. The over-voltage protection circuit is not adjustable. However, if components indicated by the

symbol on the schematic in either the horizontal sweep system or the over-voltage protection circuit itself are changed, the operation of the circuit should be checked using the following procedure:

Equipment needed to check the disabled circuit:

1.DC Ammeter

2.High Voltage Meter (0- 50kV electrostatic)

3.Variac or Isolation Transformer

4.HHS Jig (See Fig. 2)

Preparation

1.Connect Receiver to AC 120 Volts. Do not turn ON.

2.Connect HIGH VOLTAGE meter to 2nd anode (H.V. button). Note: Use cold ground( ) for negative lead.

3.Connect the ammeter serial from the flyback anode lead to the picture tube anode socket.

4.Prepare HHS jig to be connected between TPD50 and TPD51 as shown in Fig. 2.

Procedure:

1.Open Connector A17.

2.Turn power ON and Apply a monoscope pattern.

3.Set current within 50-100μΑby changing the picture and bright controls.

4.Turn power OFF.

5.Connect HHS jig between TPD50 and TPD51 (VR should be turn fully clockwise).

6.Turn power on.

7.Turn slowly the variable resistor to increase the current until the horizontal sync frequency abruptly increases indicating that the horizontal frequency is

just beginning to pull out of sync. Maintain the current within 50-100μΑby changing the picture and bright controls

8.Observe the High Voltage meter. HIGH VOLTAGE should read less than 40.2kV.

9.Turn power OFF, Remove HHS jig, HV meter, ammeter and connect A17 connector.

10.Turn Power ON. Reset Picture and Brightness controls. Confirm B+ 140V±1.5V with 120V AC applied.

11.IF HIGH VOLTAGE IS NOT WITHIN THE SPECIFIED LIMIT THE CAUSE MUST BE DETERMINED BEFORE THE RECEIVER IS RETURNED TO THE OWNER.

TPD50 100Ω 1KΩ TPD51

Figure 2. HHS Jig

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Panasonic CT-32SX31UE, CT-36SX31CE, CT-36SX31UE, CT-36SX31E Horizontal Oscillator Disable Circuit, Preparation, Procedure
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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.

Panasonic has incorporated various technologies into these models, such as the Digital Comb Filter, which significantly reduces image distortion and enhances the overall picture quality. This feature allows for clearer images with improved color accuracy, making it ideal for watching movies and sports. Additionally, the models are equipped with a 3D Y/C separation processing feature that further elevates the quality of video playback by enhancing the precision of image separation.

Audio quality is also a focal point of these models. The television sets come with built-in speakers, providing powerful sound output that complements the stunning visuals. With features like surround sound capability, viewers can enjoy an enriched audio experience that brings movies and shows to life.

Connectivity is another essential aspect of these televisions. They are equipped with multiple input options, including composite, S-Video, and component inputs. This variety allows users to connect various devices like DVD players, gaming consoles, and cable boxes, facilitating a versatile entertainment setup.

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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