Erisson 21TI70, 2120 Schematics

ADJUSTMENT MANUAL OF 3S10 CHASSIS

(ONLY APPLICABLE TO ST92195 VER2.0)

Written by: Han Shixin

Date : Feb .2,2002

(Information herein is subject to change with prior notice.)

ALIGNMENT INSTRUCTION (3S10)

1. Preface

This ADJUST MANUAL is only used for 3S10 chasiis, and guides to make adjust equipments. It

is only a reference.

2. Instruments For Adjustment

a. TV signal generator b. 20MHz 2-channel oscilloscope c. Adjust jigs d. Sweep Signal Generator(option) e. Digital voltmeter f. White balance adjust equipment.

3. How To Enter And Exit Factory Mode

a. Enter factory mode by pressing MENU button, AV button and ANAL button in turn or pressing

the SERVICE button(on the right of MENU button,we can add this button for easy to enter

service mode in factory).Press OK to enter Service 2.0 and Design mode.

Exit factory mode by pressing PP or pressing STANDBY button.

4. Chassis Adjust 4-1. VCO Adjust

a. Set TV Signal Generator to output a 38.9MHz, stranger than 80dBuv PAL color bar signal. b. Signal inputs to TUNER’s IF terminal or pin5 of SAW101 through a 0.01UF/50V capacitor c. Connect 220V AC (50/60Hz) and Switch on power switch. Enter Service 2.0 menu. d. Press AV button after picking out VCO Coarse or VCO Fine item by PROG+/- buttons. VCO

is well adjusted automatically if the character OK appears at the bottom of screen. (If OK can

not appear automatically,please fine tune LC238 and re-try again) e. The following adjustment is suitable for TV sets with SECAM L/L’ system. Set TV signal Generator to output a 34.4MHz Signal ,set TV set to VHF-L band. Press AV button after picking out VCO Coarse L1 or VCO Fine L1 by PROG+/- buttons. The VCO of SECAM L’ system is well adjusted if the character OK appears automatically at the bottom of screen. Note: After VCO is well adjusted,exit factory mode by pressing PP button at first, switch off power switch, then withdraw IF signal. Signal

4-2. IF Trap(LC101) Adjust For RF NTSC

a. Receive RF NTSC signal.

Adjust LC101 until picture is best.(We also can use a sweep sigmal generator to get best the trap

point)

4-3. AGC Adjust

a. Receive 60dBuV RF signal. b. Enter Service V2.0 mode and get Tuner AGC PAL item, adjust PAL AGC by VOL+/- buttons

until picture’s noise just disappears and no distortion under 100dBuV level.

c. If TV has SECAM LL1 system:enter Service V2.0 mode and get Tuner AGC LL1 item, adjust

SECAM LL’ AGC by VOL+/- buttons until picture’s noise just disappears and no distortion under 100dBuV level.

d. If TV has SECAME LL1 fsystem:press OK key to enter design menu,set AGC Gain PAL to

1,set AGC Gain LL1 to 3

4-4.

Main Power Adjust (B+)

a. Switch on power switch.

b. Measure the voltage with digital voltage meter between two terminals of C615.

c. Adjust VR601 to obtain 110+/-0.5V on the Digital Voltage meter. (The voltage will have a little difference

when use difference type of CRT.ORION A51JSW91X50 CRT is 118V;HITACH CRT is 110V)

5.Complete TV General Adjust

5-1. Screen Voltage Adjust(G2).

Set TV set to factory mode without signal input, Then press MUTE button, a horizontal line appears.

a. Adjust the “SCREEN” knob of FBT until a horizontal line is just can be seen.

b. Pressing MUTE button to exit one line mode .

5-2. Focus Adjust

a. Receive CROSS HATCH PATTERN, set picture to Dynamic statue by pressing PP button.

b. Adjust the “FOCUS” knob of FBT to get a most clear picture.

5-3. White Balance Adjust.

Receive black & white pattern (PAL SYSTEM)

a. Set picture to Standard statue, adjust white balance equipment to get 2cd/m

at high brightness.

b. Enter white balance adjust mode of factory mode. Two probes of white balance equipment close up the low

brightness and high brightness area.

c. Adjust Red Gain ,Green Gain ,Blue Gain ;DC Red,DC Green,(DC Blue is better to fixed to 64) using remote

handset to meet factory requirement. Button’s function refers to the following table.

Remote handset:

at low brightness and 100cd/ m

+ + +

1 2 3

RED GAIN GREEN GAIN BLUE GAIN

- - -

4 5

+ + +

5-4. Horizontal/Vertical Central Adjust

a. Receive MONOSCOPE PATTERN.

b. Get H Position item,use VOL+/- buttons to set H center of the picture to meet factory requirement.

c. Vertical central can not be adjusted by IIC bus. But we can use a 1.5K /2W resistor(R312 or R311 )or omit it to

adjust it

5-5. SUB-Brightness Adjust

a. Receive GREY SCALE/COLOR BAR pattern.

b. Enter Service V2.0 mode.

c. Press PROG +/- buttons to select Bright Max. Set a fixed value by VOL+/- buttons (The value will be

difference when use difference type of CRT.. ORION A51JSW91X50 CRT CRT is 63).

d. Press ANAL button to get Bright Min item and bright, contrast ,color become zero automatically. Press

7 8 9

DC RED DC GREEN DC BLUE

- - -

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Q.VIEW

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