Sony KV-27S42 service manual Section Safety Related Adjustments, Preparation Before Confirmation

Page 18

KV-27S42/27S46/27S66/29AL42/29AL42C/29AL66/ 29AL66C/29SL42/29SL42C/29SL46/29XL42M

SECTION 4

SAFETY RELATED ADJUSTMENTS

4-1. R584 CONFIRMATION METHOD (HV HOLD-DOWN CONFIRMATION) AND READJUSTMENTS

The following adjustments should always be performed when replacing the following components which are marked with on the schematic diagram:

DY, C508, C505, C507, C509, C511, C515, C520, C573, C574, C575, D572, D573, D574, IC301, IC521, IC602, L591, L501, R582, R583, R585, R578, R586, R625, R626, T504

Preparation Before Confirmation

1.Using a Variac, apply AC input voltage: 120 ± 2 VAC

(or 120-220 ± 2 VAC for KV-29AL42/29AL42C/29AL66/ 29AL66C/29SL42/29SL42C/29SL46/29XL42M only.)

2.Turn the POWER switch ON.

3.Input a white signal and set the PICTURE and BRIGHTNESS controls to maximum.

4.Confirm that the voltage between C574 (+) or TP503 and ground is more than 105 VDC.

Hold-down Operation Confirmation

1.Connect the current meter between Pin 11 of the FBT (T505) and the PWB land where Pin 11 would normally attach. (See Figure 1 on the next page.)

2.Input a dot signal and set PICTURE and BRIGHTNESS to minimum: IABL = 100 + 100/-95 ∝A.

3.Confirm the voltage of A Board TP-600 is 135 ± 3 VDC.

4.Connect the digital voltmeter and the DC power supply via diode 1SS119 to C574 (+) and ground. (See Figure 1 on the next page.)

5.Increase the DC power voltage gradually until the picture blanks out.

6.Turn DC power source off immediately.

7.Read the digital voltmeter indication (Standard: less than or equal to 141.3 VDC).

8.Input a white signal and set PICTURE and BRIGHTNESS to maximum.

9.Repeat steps 4 to 7.

Hold-down Readjustment

If the setting indicated in step 2 of Hold-down Operation Confirmation cannot be met, readjustment should be performed by altering the resistance value of R584, components marked with .

T504

FBT

ammeter

3.0 mA DC range

ABL + A -

IABL

4-2. B+ VOLTAGE CONFIRMATION AND ADJUSTMENT

Note: The following adjustments should always be performed when replacing the following components, which are marked with on the schematic diagram on schematic diagram.

IC601, IC602

1.Using a Variac, apply AC input voltage: 130 ± 2 VAC (or 120-220 ± 2 for KV-29AL42/29AL42C/29AL66/ 29AL66C/29SL42/29SL42C/29SL46/29XL42M only.)

2.Input a dot signal.

3.Set the PICTURE and BRIGHTNESS controls to minimum.

4.Set to service adjustment mode.

5.Select PADJ with and .

6.Adjust with to the 0 level.

7.Confirm that the voltage of A Board TP-600 is less than 138 VDC.

8.If step 7 is not satisfied, replace the components listed above, then repeat the above steps.

9.Adjust with and for: 135+ 3 VDC

10.Write into the memory by pressing then

.

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Contents BA-4DCHASSIS Trinitron Color TV Specifications Standby DimensionsW/H/DTable of Contents SELF-DIAGNOSTIC Function SAFETY-RELATED Component WarningSTANDBY/TIMER LED 101Self-diagnostic Circuit Safety CHECK-OUT Leakage TestConnecting Your TV Section GeneralKV-27S42/27S46/27S66/29AL42/29AL42C/29AL66 Troubleshooting Disassembly SectionRear Cover Removal Chassis Assembly Removal Service PositionPicture Tube Removal Anode CAP RemovalBeam Landing Section SET-UP AdjustmentsAdjustment Procedure Purity ControlVertical Static Convergence Dynamic Convergence AdjustmentConvergence Horizontal Static ConvergenceMethod of Setting the Service Adjustment Mode White Balance AdjustmentsB+ Voltage Confirmation and Adjustment Section Safety Related AdjustmentsHold-down Readjustment Preparation Before ConfirmationFBT ABL11 Service Adjustment Mode On Section Circuit AdjustmentsSetting the Service Adjustment Mode Adjust Buttons and IndicatorsAdjustment Items Service Data Initial Value Average Data Name RangeBoard Adjustments Center Adjustment Vpos Sub Hue, Sub Color Adjustment SHUE, ScolSize Adjustment Vsiz Center Adjustment HposPart Replaced Adjustment Section Diagrams Block DiagramPrinted Wiring Boards and Schematic Diagrams Circuit Board LocationBoard * Mark Variant List Board Schematic Diagram Board Waveforms Board IC Voltage ListHT Board Schematic Diagram Board Schematic Diagram Board * Mark Variant List Board ICBoardtransistor Board Schematic Diagram Component Side Board WaveformsCV Board Transistor CV Board IC Voltage List CV Board WaveformsBoard Transistor Voltage List Section Exploded Views HV Board Schematic Diagram Board IC Voltage ListSemiconductors IC1403Multi Button Emblem NO.9, SonyBeznet Assy KV-29XL42M GUIDE, LEDCV Mounted PC Board Beznet AssyDY Y29NXA-V Piece a 110, Conv CorrectCORD, Power with Connector 25 A-1372-617-A HV VAR Mounted PC BoardCABLE, P-P Model Common Parts Listing a CapacitorCommon Parts Listing Connector DiodeChip Conductor Ferrite BeadJack CoilTransistor 2SD601A-Q ResistorQ300 Transistor 2SA1091-OREF.NO. Part no Metal CarbonTransformer SwitchRelay RES, ChipThermistor TunerCrystal Diode Thermistor Board Variant Parts ListConnector Transformer LINK, ICDiode Transformer 560µF400V KV-27S46 680µFConnector Switch KV-29SL46Board Variant List KV-27S66 IC STR-F6626Board Variant List KV-29AL42/29AL42C Transformer Capacitor THP601 ! 1-803-540-11 ThermistorRES,CHIP Transistor Thermistor Board Variant List KV-29AL66/29AL66CJack Transformer R391J1751 ! 1-251-688-11 SOCKET, CRT 125V J17010022µF KV-27S42/27S46/27S66 onlyFuse VaristorHV K REF.NO. Part NO. Descriptionremark C3301 Accessories and Packing Material Remote CommanderPage Page Sony Corporation 965-857-01CORRECTION-1 733-873-05 CRT 29NXIncorrect CorrectDYY29VXA-V2 SUPPLEMENT-1 Chassis KV-27S46/27S42/29SL42/29SL42C/29SL46/29XL42M/29SL43 SUPPLEMENT-2 Beznet Assy KV-29XL42M Correction
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KV-27S42 specifications

The Sony KV-27S42, KV-27S66, and KV-27S46 are notable models within Sony's acclaimed line of Trinitron televisions, which contributed significantly to the brand's reputation for delivering high-quality viewing experiences. These models are characterized by their sturdy construction, vibrant picture quality, and user-friendly features, which made them popular among consumers during their release.

The KV-27S42 model is equipped with Sony's advanced Trinitron technology, offering a flat CRT screen that minimizes glare and enhances color accuracy. With a 27-inch display size, the KV-27S42 is designed to provide an immersive viewing experience without occupying excessive space in the living room. This model also features a variety of input options including composite, S-video, and RF inputs, allowing users to connect multiple devices such as VCRs, DVD players, and gaming consoles effortlessly.

The KV-27S66 model builds upon the strengths of its predecessor with enhancements in audio and video technologies. It features a built-in 2-channel sound system that delivers clear and dynamic audio, complementing the stunning visuals produced by the Trinitron display. The KV-27S66 also includes a digital comb filter, which improves picture sharpness by separating the brightness and color signals, resulting in reduced artifacts and enhanced clarity.

Meanwhile, the KV-27S46 incorporates some of the latest technologies of its time, such as the use of Super Fine Pitch Trinitron technology. This innovation enhances the display's resolution, offering finer detail and more precise color reproduction. The KV-27S46 also supports multiple viewing formats, making it suitable for various video sources, including standard cable and DVDs.

Each of these models is designed with an intuitive on-screen menu that simplifies the navigation of settings, making it easy for users to adjust picture and sound settings to their preferences. Remote control functionality further enhances the user experience, allowing for effortless operation from a distance.

In summary, the Sony KV-27S42, KV-27S66, and KV-27S46 televisions stand out for their historical significance in delivering quality display and audio technologies. With various features that cater to home entertainment needs, these televisions remain a testament to Sony's lasting legacy in the consumer electronics market. While these models may not compete with today's flat-screen technology, they were pioneering products that set the stage for future innovations in television design and performance.
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