Akira CT-21PX9R Manuel utilisateur

Colour TV

Service Manual

CHASSIS: 3Y11

MODEL: CT-21PX9R

Model No: CT-21PX9R

Version 1.0

CONTENT

MAIN CHASSIS ADJUSTMENT.................................................................................................4

COMPLETE SET GENERAL ADJUSTMENT ............................................................................7

PURITY & CONVERGENCE ADJUSTMENT ............................................................................9

CONTROL LOCATION.............................................................................................................10

INPUT & OUTPUT TERMINALS ..............................................................................................11

OPERATION INSTRUCTION...................................................................................................12

MECHANICA DISASSEMBLING..............................................................................................16

CABINET PARTS LIST ............................................................................................................18

CIRCUIT DIAGRAM .................................................................................................................19

CPT PCB TOP PLATER...........................................................................................................22

EXPLODED VIEW....................................................................................................................23

PART LIST ...............................................................................................................................24

BOM LIST ................................................................................................................................25

Model No: CT-21PX9R

Version 1.0

MAIN CHASSIS ADJUSTMENT

1. Tuner AGC terminal connects to GND. Pattern Generator (set signal generator RF

output level to 100Bu. If it can not obtain 100dBuv, set level to MAX) outputs

38.9MHz R.F. signal and connects to tuner IF output terminal or pin 5 of saw filter.

2. Connect Digital voltmeter across C227. DC Regulated power supply positive terminal

output +20V to pin 1 of IC302 and negative terminal of D608. DC regulated power

supply negative.

PIF Adjustment (38.9M Figure 1)

Model No: CT-21PX9R

Version 1.0

1. Tuner AGC terminal connects to GND. Connect Sweep signal generator (set Sweep

signal generator output level to 100dBuv. If it can not obtain 100dBuv, set Level to

MAX) to tuner IF output terminal. Sweet oscilloscope V-IN terminal connects to C109

and connect Q102 B pole to the power terminal of R104 through a 10K resistor

(shown in figure 2)

2. Apply +20VDC across IC302, viz C320 Positive terminal as shown in figure 2.

3. Adjust L108 to obtain waveform as below.

Model No: CT-21PX9R

Version 1.0

B+ Adjustment (VR601)

1. Disconnect horizontal load. Connect a light bulb (100W) AC250V across C321).

2. Connect 220V AC 50/60Hz to CN601 and switch on power switch.

3. Test the voltage with digital meter between C321 two terminals.

4. Adjust VR601 to obtain +110V +/-0.5V.

Factory Mode Adjustment

1. Press “MENU” key twin, till the “PICTURE MENU” appears, then press “Q. VIEW”

key. “MUTE” key to turn on CPU. “TV SET” will go to factory mode. Press “TIMER”

key “TO” go to the next Factory menu. Go to “MENU3” status by this means.

2. Press “MENU” key to exit factory mode.

AGC Adjustment

1. Receive 60dB +/-dB therefore signal. Connect Digital volmeter positive terminal to

AGC terminal of Tuner and negative terminal to GND.

2. Go to MENU 3 status according to FACTORY MODE ADJUSTMENT.

3. Select RF. AGC by pressing CH+ or PROG+ keys. Adjust VOL + and VOL – key to

obtain 4V DIGITAL voltage meter reading.

4. Press MENU key to exit factory mode.

Model No: CT-21PX9R

Version 1.0

COMPLETE SET GENERAL ADJUSTMENT

Focus Adjustment

1. Receive monoscope pattern.

2. Set TV to work in dynamic status.

3. Adjust the focus knob of FBT to get the clearest picture.

Screen Voltage Adjustment

1. Go to factory mode MENU2 status according to AGC adjustment (2).

2. Select V-KILL by pressing CH+ or PROG+ and CH- or PROG- KEYS.

3. Press VOL+ key all the time, adjust screen of FBT to get a horizontal faintness beam

line. Then Loose VOL+.

White Balance Adjustment (Applied When Servicing)

1. Set the TV set to AV mode. Receive black white pattern (color temperature test

pattern).

2. Put test probe 1 of CRT color analyzer (CA-100) on the low bright area and the test

probe 2 on the high bright area. Adjust and contrast to get 5 nit of low bright area and

80nit of high bright area.

3. Go to factory mode MENU2 according to AGC adjustment (2). Obtain low bright area

to X=281 and Y=311 by adjusting R.bias and B.bias. Obtain both area to X=? and

Y=? by adjusting the two status repeatedly.

Note: The values of X & Y maybe changed by the favour of customer.

Sub-bright Adjustment

1. Receive GREY SCALE signal.

2. Set TV normal mode.

3. Go o factory mode, adjust sub-bright option to make the picture same as below.

Vertical Size And Pincushion Adjustment

1. Receive monoscope pattern. Set TV standard status. Adjust V.size to obtain picture

vertical redisplay ratio more than 90% in factory mode MENU1.

2. Receive cross hatch pattern. Set TV standard status. Adjust V.LINE and V.SC to obtain

picture vertical pin cushion a good status in factory mode MENU1.

3. Receive cross hatch pattern. Set Tv standard status. In factory mode MENU1 adjust

V.POSITION to obtain picture vertical center of CRT screen.

Model No: CT-21PX9R

Version 1.0

Horizontal Center Adjustment

Receive PHILIPS pattern. Set TV standard status. Adjust H.PHASE to obtain horizontal

center at the center of CRT screen.

Secam color decoder alignment

Receive the GREY SCALE/COLOR BAR signal. Enter into the factory mode. Adjust the

valuse of secam R-Y DC and Secam B-Y DC to make the gray scale to the normal color.

Pure flat tube alignment

Horizontal size and pincushion distortion must be adjusted in pure flat tube as following:

1. Receive mono scope pattern. Adjust VR902 until redisplay ratio is correct.

2. 2.Receive cross hatch pattern signal. Adjust Vr901 until the erect klines of the CRT two

sides are most straight.

Model No: CT-21PX9R

Version 1.0

PURITY AND CONVERGENCE ADJUSTMENT

Color Purity Adjustment

1. Before color purity adjustment, warm up the TV set over 15 minutes and fully degauss.

2. Receive pure white signal in AV status and set the TV receiver dynamic.

3. Go to factory mod MENU2. After write down the values of R-BIAS and B-BIAS, set the

values of R-BIAS and B-BIAS zero.

4. Loosen the clamp screw of the deflection yoke and pull the deflection yoke towards color

purity Magnetic loop.

5. Adjust color purity magnetic loop to make the green area at the center of CRT screen.

6. Slowly push the deflection yoke toward the front of CRT and set it where a uniform green

field is obtained. Tighten the clamp screw of the deflection yoke.

7. Restore the values of R-BIAS, G-BIAS AND B-BIAS.

Convergence Adjustment

1. Receive a dotted pattern. Set the TV receiver dynamic.

2. Loose the convergence magnet clamper and align red with blue dots at the center of the

screen by rotating (R, B) static convergence magnets.

3. Align Red/Blue with green dots at the center of the screen by rotating (RB-G) static

convergence magnet.

4. Remove the DY wedges and slightly tilt the deflection yoke horizontally and vertically to

obtain the good overall convergence. Fix them after the goob overall convergence got.

5. Fix purity error is found, follow PURITY ADJUSTMENT instructions.

Model No: CT-21PX9R

Version 1.0

CONTROL LOCATION

1. Remote Sensor

2. Power Indicator

3. Main Switch

4. Speakers

5. Program Down & Up Button

6. Volume Down & Up Button

7. Menu Button

8. AV/TV Button

9. Front AV In (Option)

10. Audio/Video - In/Out Jack

11. AC Power Cord

12. Terminal Antenna (75 Ohm)

Model No: CT-21PX9R

Version 1.0

Table des matières

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