SHARP 14BM2SMK2
Service Manual

CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST NTSC CHROMA ADJUSTMENT
BUS CONAV in. 4 Max 1. Receive the "Monoscope Pattern" signal.
SAME LEVEL

(Continued) No. point Adjusting procedure/conditions Waveform and others

No. point Adjusting procedure/conditions Waveform and others 2 1 SUB-TINT (I C 1. Receive the "NTSC 3.58 Colour Bar" signal thru

beam check Press R/C set Picture NORMAL condition. TROL) 2. Connect the oscilloscope to TP47B (P882 pin 5)

3. Connect the DC miliammeter between TP603 (+) BLUE-OUT.

4. Beam current must be within 800 ± 100 µA.(14") 3. Call the "SUB-TINT" mode in service mode. Adjust "SUB-TINT" bus data to obtain the wave4. Clear the SERVICE mode.

& TP602 (�). » Range : 100mV/div. (AC)(Use Probe 10:1) (Full Scale: 3 mA Range) » Sweep time : 10 µsec/div.

HORIZONTAL AND VERTICAL DEFLECTION LOOP ADJUSTMENT form shown as Fig. 1-1.

No. point Adjusting procedure/conditions Waveform and others

W Y Cy G Mg R B

Fig. 1-1

2

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

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

PROTECTOR OPERATION CHECKING horizontal line in the center of monoscope is

just at position where the blanking starts. No. point Adjusting procedure/conditions Waveform and others

2 V-SHIFT-50 Call the "V-CENT" mode. 1 BEAM PRO1. Receive "Monoscope Pattern" signal. * Select one of Q883/5/7 to do

2 (I C BUS TECTOR2. 2.Increase Setor CONTRASTdecrease MAX."V-CENT" eachby shortVolume test.key CONTROL) till the picture is centered. 3. Set BRIGHT MAX.

2

3 V-AMP50 (I C 1. Call the "V-AMP" mode. make sure the protector ON and switch to standby mode. TROL) set overscan of 9.5% typical. 2 H�V PROTEC1. Receive "Monoscope Pattern" signal.

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

BUS CON2. Increase or decrease "V-AMP" by Volume key to

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

H-SHIFT (50) 1. Call the "H-CENT" mode. TOR 2. Connect output of Bias Box to D603 cathode 4 (H-CENTER) 2. Increase or decrease "H-CENT" by Volume key (R610 side). 3. Set voltage of Bias Box 18V and make sure to center the picture horizontal. the protector is not work.

9
No. point Adjusting procedure/conditions Waveform and others

5 S-CORREC1. SET DATA TO 17. 4. Set voltage of Bias Box to 27V, and make sure

2 TION (I C BUS * Check the E-5 CH the Monoscope protector Pattern is then work. reCONTROL) adjust V-Slope, V-Shift and V-Amp to makesure

6 SUB-SHARPprotectors testing in +B line, check all possible damaged

adjustment is in acceptable Ring-Shaped. 3 Other 1. Once finish rectified Electrolytic Capacitor short

NESS 1. SET DATA TO 20. components on +B line. (Use random selected set for inspection) 1. Receive the "Monoscope Pattern" signal.

1 Focus

2. Press R/C to set Picture NORMAL condition. 3. Adjust focus control to get the best focusing.

A/V INPUT AND OUTPUT CHECKING PAL CHROMA ADJUSTMENT
1. Receive the "PAL Color Bar" signal (100% White 1 VIDEO AND AUDIO Color Bar, Sound 400 Hz 100% Mod). 2. Terminate the Video output with a 75 ohm imped1 SUB COLOUR 1. Receive the "PAL Colour Bar" signal. OUTPUT 3. Terminate the Audio output with a 10k ohm imVp-p ±3 dB). CONTROL) 3. Connect the oscilloscope to pedance. Make sure the O/P is as specified

No. point Adjusting procedure/conditions Waveform and others

2

ance. Make sure the output is as specified (1.0 (I C BUS 2. Press R/C to set Picture Normal condition. CHECK

Cy G B

Red cathode(D881 Cathode). » Range : 20 V/div. (AC) (Using 10:1 probe) (1.76 Vp-p ±3 dB). » Sweep time : 10 µsec/div.

4. R/C call "SUB COL" in SERVICE mode. 2 VIDEO AND 1. Using TV/AV key on the remote controller,

Adjust SUB COLOUR bus data, so 75% AUDIO INPUT make sure that the modes change in order of TV, White Red portions of PAL Color Bar be at W Y 100%W Mg R AV TV again and the video & audio output are CHECK

75% same level shown as Fig. 1-1. according to the input terminal for each mode.If
Fig. 1-1 put terminal of Front AV will be selected.

connect input to Front and Rear AV terminal, in5. Clear the SERVICE mode.

14BM2SMK2 14BM2GMK2

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