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.

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Hitachi 50SBX78B, 60SBX78B service manual Center Front Rear

60SBX78B, 50SBX78B specifications

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