Sharp 20BM2S Panduan Servis - Halaman 9

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HORIZONTAL, VERTICAL, DEFLECTION LOOP AND FOCUS ADJUSTMENT

NO. Adjustment part

Adjusting procedure and conditions

V-SLOPE

1. Receive Monoscope Pattern Signal.

C BUS

2. Call the "V-LIN" mode.

CONTROL)

3. Increase or decrease "V-LIN" by Volume key till

the horizontal line in the center of monoscope is

just at the position where the blanking starts.

V-SHIFT-50

1. Call the "V-CENT" mode.

C BUS

2. Increase or decrease "V-CENT" by Volume key

CONTROL)

till the picture is centered.

V-AMP 50

1. Call the "V-AMP" mode.

C BUS

2. Increase or decrease "V- AMP" by Volume key

CONTROL)

to set overscan of 9.5% typical.

Adjustment Spec 9.5% range +1% -0%.

S-CORRECTION

FIXED DATA, NO NEED TO ADJUST.

C BUS

CONTROL)

H-SHIFT (50)

1. Call the "H-CENT" mode.

(H-CENTER)

2. Increase or decrease "H-CENT" by Volume key

C BUS

to center the picture horizontal.

CONTROL)

FOCUS

1. Receive the "Monoscope Pattern" signal.

ADJUSTMENT

2. Press R/C to set Picture NORMAL condition.

3. Adjust the focus control to get the best focusing.

PAL CHROMA ADJUSTMENT

NO. Adjustment part

Adjusting procedure and conditions

SUB COLOUR

1. Receive the "PAL Colour Bar" signal.

C BUS

2. Press R/C to set Picture Normal condition.

CONTROL)

3. Connect the oscilloscope to Red cathode.

» Range

: 20 V/Div. (AC) (Use 10:1 probe)

» Sweep time : 10 µsec/Div.

4. Using the R/C call "SUB COL" in SERVICE

mode. Adjust SUB COLOUR bus data, so that

the 75% White & Red portions of PAL Colour

Bar be at the same level shown as Fig. 8.

5. Clear the SERVICE mode.

Waveform and others

Cy G

W Y 100%W

Mg R

75%

Fig. 8

9-1

NTSC CHROMA ADJUSTMENT

NO. Adjustment part

Adjusting procedure and conditions

SUB-TINT

1. Receive the "NTSC 3.58 Colour Bar" signal thru

C BUS

AV in.

CONTROL)

2. Connect the oscilloscope to TP853 (Pin (5) of

P882) BLUE-OUT.

» Range

» Sweep time : 10 µsec/Div.

3. Call the "SUB-TINT" mode in service mode.

Adjust the "SUB-TINT" bus data to obtain the

waveform shown as Fig. 9.

4. Clear the SERVICE mode.

PROTECTOR OPERATION CHECKING

NO. Adjustment part

Adjusting procedure and conditions

BEAM

1. Receive "Monoscope Pattern" signal.

PROTECTOR

2. Set CONTRAST MAX.

3. Set BRIGHT MAX.

4. During the Collector & Emitter of Q883/5/7

short, make sure the protector ON and switch

to standby mode.

H, V

1. Receive "Monoscope Pattern" signal.

PROTECTOR

2. Connect output of Bias Box to D607 cathode

(R606 side).

3. Set voltage of Bias Box to 18V and make sure

the protector is not work.

4. Set voltage of Bias Box to 27V, and make sure

the protector is work.

OTHER

1. Once finish rectified Electrolytic Capacitor short

PROTECTOR

testing in +B line, check all possible damaged

components on +B line.

(Use random selected set for inspection)

A/V INPUT AND OUTPUT CHECKING

NO. Adjustment part

Adjusting procedure and conditions

VIDEO AND

1. Receive the "PAL Colour Bar" signal (100%

AUDIO OUTPUT

White Color Bar, Sound 400 Hz 100% Mod

CHECK

C475.)

2. Terminate the Video output with a 75 ohm im-

pedance. Make sure the output is as specified

(1.0 Vp-p ±3 dB).

3. Terminate the Audio output with a 10K ohm

impedance. Make sure the output is as speci-

fied (1.76 Vp-p ±3 dB).

VIDEO AND

1. Using the TV/AV key on the remote controller,

AUDIO INPUT

make sure that the modes change in order of

CHECK

TV, AV1, AV2 & TV again and the video & audio

output are according to the input terminal for

each mode.

Waveform and others

SAME LEVEL

: 100 mV/Div. (AC)

(Use Probe 10:1)

Y Cy G Mg R B

Fig. 9

Waveform and others

* Select one of Q883/5/7 to do each

short test.

Waveform and others

9-2