Hitachi 50SBX78B, 60SBX78B service manual Center Front Rear

Page 28

2.5.4 Matrix surround/monaural check Adjustment procedure

l Check that the following waveforms are obtained. (Input signal @ only)

l

Front:

R and

L waveforms

are

almost

equal.

l

Rear:

R and

L waveforms

are

almost

Zero.

 

 

FRONT

REAR

 

Note: Center has no output.

2.5.5 Hall surround check

Adjustment procedure

(1)Set to SURROUND: HALL. (Input signal 0 and @ ).

lFront: Check that the phases of R and L signals

are different and 400 Hz is superimposed on 5kHz.

lRear: Check that the R and L are opposite and 400Hz is superimposed on 5kHz. The R and L amplitudes are equal.

FRONTREAR

L

R

Note: Amplitude levels of front R and L are not even depending on P.W.B. Center has no output.

2.5.6 Hall surround/monaural check

Adjustment procedure

lCheck that the following waveforms are obtained.

(Input signal @ only)

l Front: The phases of R and L are different. The amplitudes are different.

l Rear: The phases of R and L are opposite. The amplitudes of R and L are equal.

FRONTREAR

Note: The monaural check can be omitted. Amplitude levels of front R and L are not even depending on the P.W.B. Center has no output.

2.5.7 Dolby surround check

Adjustment procedure

(1) Set to SURROUND: DOLBY-NORMAL

. Check that the following waveforms are obtained. (Input Signal @ and @ )

.

Front:

400 Hz is superimposed on 5kHz.

.

Rear:

R and L are the

same signal and 400Hz

 

 

is superimposed

on 5kHz.

 

FRONT

REAR

L

R

Note: MODE: PRO LOGIC (NORMAL)

2.5.8 Dolby surround/monaural check

Adjustment orocedure

(1) Set t0 SURROUND: DOLBY-NORMAL

. Check that the following waveforms are obtained.

(Input signal @ only).

.

Front:

Almost

no output

from

both

R and

L.

.

Center:

Same

as the audio input signal.

 

.

Rear:

Almost

no output

from

both

R and

L.

CENTER

 

FRONT

 

 

REAR

 

2.6 Raster Inclination adjustment (Deflection yoke)

Adjustment preparation

(1)The set can face east or west. Input the single cross test signal.

I:; Set video conditions to factory reset.

(4)The lens focus adjustment should have been completed.

(5)The electric focus should have been coarse adjusted.

(6)The digital convergence RAM should be cleared (uncorrected state). With the TV set off, press and hold the service switch located on the Power/Deflection PWB and then press the power button.

(7)Start adjustment 20 minutes or more after TV is turned on.

Adjustment procedure

(1)Apply covers to the R and B lenses and project only green light.

(2)Turn the G deflection yoke and adjust the vertical raster inclination.

(3)Then, remove the cover of R or B lens and project red or blue light and green light together on the screen.

28

Page 27 Page 29
Image 28
Page 27 Page 29
Contents Contents Projection Color TelevisionSafety Notice USE Isolation Transformer When Servicing Safety Precautions Leakage Current for Appliances and UnderwritersTube Detailing X-radiation ShieldPage Servicing Precautions Immediately before handling any semiconductorUse Solding Iron to Pry Leads Insulated Jumper Wire Bare JumperSoldering Iron Iron wire Determine the positionsIPOWER/DEFLECTION PWB Technical CautionsAudio Output Power Dimension 50SBX78BAudio Input Stereo Audio OutputGeneral Information TransmitterCustomized Picture and Sound Adjustments CursorCOLOR, Tint Brightness Color TintIll BassGuide TV Guide PLUS+VCR Step ExampleSelect Outside antenna or Cable TV coaxial cableRecall AudioVCR #I 0Set U END of SET UP FBT RemarkMake sure the silicon cover is Covering the high voltage outputCRT AdjustmentCPT Adjustable data Others Fixed data be careful not to change When ExchangingTime Tour at first Power on by Adjustment procedureFinal Assembly Adjustment Contrast Half Brightness MinimumWhite balance adjustment Sub brightness adjustmentRepeat for P832 and ROM6 Green, P862 and ROM4 for Red PointFrontrear MrnFront Rear Center Front Rear+2 mm Vertical size adjustment R630Twa4 Horizontal size adjustment R603 Adjustment preparation +- $$iConvergence first. Press front panel Magic Observing PointsThis can eliminate the need for a complete Before JIG Screen SpecificationAfter Convergence point adjustment Digital Convergence Remote ControlThen Press RECALL’ ROM WriteGUIDE+ OSD Adjustment Point CRT, cabinet locationsSURROUNDP.W.B.SIGNALSUB B. VM Main Chassis Signal P.W.BIscii ROM8 ROM6 ROM4Main Chassis Power/Deflection P.W.BIXI Ooor CPT R G B, Focus Pack, Control P.W.BTroubleshooting YesOFF TvsvYes No.~ Voltage at pin 5 Yes E991 blownNormal Abnormal 0517 Q516 Does on-screen 1501, 1903, 1001Q108, Q109, QllO, Q008 Yes NormalEception impossible with snow noise Yes U102 Yes Vcc Sv, BP 5v, T3u102Defective Synchronization Cl902PRT R PRT GNo Sound U101DCU Repair Table NtscTV ON/OFF Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Exploded MEW Replacement Parts List Symbol PartProduct Iooopfkb 50V TapeComponents Symbol Part IELTape 5OVChip Product Service SymbolCSE3 Symbol Part Description RmpgogdMTZJ-I LightPart Symbol Tuner Unit5MA Ukdg CircuitsPart Description 1OUHIoouh CoilReceiver Through Improper Servicing QAI 1KJ Tape ROA2 ROP7 Replacement Parts List With a n Have special OOK-JB SRD1/2P-S SRD1/2P-BIOK-JB OK-JBChip 1KJMINI-CHIP RAC2OHM IOK-JQRgii RkioRlio Symbol Part NO.NO RY50 Symbol EF05951

60SBX78B, 50SBX78B specifications

The Hitachi 50SBX78B and 60SBX78B are advanced plasma televisions that represent the pinnacle of display technology in their respective categories. These models bring together innovative features, cutting-edge technology, and sleek design, ensuring an immersive viewing experience for consumers.

One of the standout characteristics of the Hitachi 50SBX78B and 60SBX78B is their screen size, with the 50-inch model catering to smaller spaces while the 60-inch offers a more cinematic experience. Both models boast impressive Full HD resolution, delivering a crisp and vibrant picture quality that enhances any viewing experience, whether it be movies, sports, or gaming.

The technology behind these televisions includes Hitachi's proprietary image processing technology, which optimizes picture quality by minimizing noise and enhancing color accuracy. This leads to deeper blacks and brighter whites, ensuring that every scene is rendered with stunning detail. The Plasmavision technology further enhances the black levels and contrast ratios, making images pop off the screen.

In addition to superior image quality, both models come equipped with a variety of connectivity options. Multiple HDMI inputs allow users to easily connect various devices such as gaming consoles, Blu-ray players, and streaming devices. The inclusion of USB ports facilitates easy viewing of photos and videos stored on external drives.

Moreover, Hitachi televisions have integrated audio technologies that enhance the overall viewing experience. The built-in speakers provide clear sound, while the digital audio output allows for connection to external sound systems, giving consumers the flexibility to customize their audio experience.

Energy efficiency is also a notable feature of the Hitachi 50SBX78B and 60SBX78B models. They are designed to consume less power than traditional televisions, aligning with the growing demand for environmentally friendly electronics. This not only reduces electricity bills but also minimizes the carbon footprint.

The sleek and modern design of these plasma televisions makes them an attractive addition to any home décor. The slim bezel offers a larger screen-to-body ratio, maximizing the viewing area while maintaining an elegant appearance.

In summary, the Hitachi 50SBX78B and 60SBX78B offer a compelling package of features, technologies, and characteristics that cater to the needs of modern viewers. With superior image quality, versatile connectivity, and energy efficiency, these televisions are designed to deliver an exceptional home entertainment experience.
Top Page Image Contents