SHARP 14PS1
Service Manual

HORIZONTAL AND VERTICAL DEFLECTION LOOP NTSC CHROMA ADJUSTMENT
No. point Adjusting procedure/conditions Waveform and others
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No. point Adjusting procedure/conditions Waveform and others 1 SUB-TINT (I C 1. Receive the "NTSC3.58 Colour Bar" signal BUS CONthrough AV in. TROL) 2. Connect the oscilloscope to TP853 (Pin (5) of P882) BLUE-OUT. » Range : 1 V/div. (AC)(Use Probe 10:1) » Sweep time : 10 µsec/div. 3. Call the "SUB-TINT" mode in service mode. AdW Y Cy G Mg R B just "SUB-TINT" bus data to obtain the waveform shown as Fig. 9. BUS CON2. Increase or decrease "V-CENT" by Volume key

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1 V-SLOPE(I C 1. Receive PAL 50Hz Monoscope Pattern Signal.

BUS CON2. Call the "V-LIN" mode. (B-Y) TROL) 3. Increase or decrease "V-LIN" by Volume key till SAME LEVEL

horizontal line in the center of monoscope is just at position where the blanking starts.

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2 V-CENTER (I C 1. Call the "V-CENT" mode.

TROL) till the picture is centered. Fig. 9

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4. Clear the SERVICE mode. 3 V AMP (I C 1. Call the "V-AMP" mode.

BUS CON2. Increase or decrease "V AMP" by Volume key TROL) to set overscan of 8.5% typical.

Adjustment Spec 8.5% range +1% -0%.

PROTECTOR OPERATION CHECKING
TECTOR 2. Set CONTRAST MAX. each short test. 4. During the Collector & Emitter of Q883/5/7 short, 2. Increase or decrease "H-CENT" by Volume key mode. 2 H, V PROTEC1. Receive "Monoscope Pattern" signal. TOR 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.

4 S-CORRECFIXED DATA, NO NEED TO ADJUST. No. point Adjusting procedure/conditions Waveform and others

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TION (I C BUS

CONTROL) 1 BEAM PRO1. Receive "Monoscope Pattern" signal. * Select one of Q883/5/7 to do

5 H CENTER 1. Call the "H-CENT" mode. 3. Set BRIGHT MAX.

center picture horizontal. make sure the protector ON and switch to standby

6 Focus 1. Receive the "Monoscope Pattern" signal.

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

3. Adjust focus control to get the best focus.

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3 Other 1. Once finish rectified Electrolytic Capacitor short No. point Adjusting procedure/conditions Waveform and others Fig. 8 CHECK ance. Make sure the output is as specified (1.0 2 VIDEO AND 1. Using TV/AV key on the remote controller, AUDIO INPUT make sure that the modes change in order of TV, CHECK AV1, AV2 TV again and the video & audio out-

PAL CHROMA ADJUSTMENT

No. point Adjusting procedure/conditions Waveform and others

1 SUB COLOUR 1. Receive the "PAL Colour Bar" signal. protectors testing in +B line, check all possible damaged (Use random selected set for inspection) CONTROL) 3. Connect the oscilloscope to Red cathode(TP851).

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components on +B line. (I C BUS 2. Press R/C to set Picture Normal condition.

» Range : 1 V/div. (AC) (Using 10:1 probe) Cy G B » Sweep time : 10 µsec/div.

A/V INPUT AND OUTPUT CHECKING

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

Adjust SUB COLOUR bus data, so that the 75% & Red portions of PAL Colour Bar be at 75% 1 VIDEO AND 1. Receive the "PAL Color Bar" signal (100% White same level shown as Fig. 8. W Y 100%W Mg R AUDIO Color Bar, Sound 400 Hz 100% Mod.)

5. Clear SERVICE mode. OUTPUT 2. Terminate the Video output with a 75 ohm imped-

* Before adjust SUB-COL, COL-OP = 8, COL-O3 Vp-p ±3 dB).

4, COL-O4 = 4 3. Terminate the Audio output with a 10k ohm imAfter sdjust SUB-COL, COL-OP 12, COL-O3 = pedance. Make sure the output is as specified 8, COL-O4 = 8 (1.76 Vp-p ±3 dB).

put are according to the input terminal for each mode.

14PS1

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