Hitachi CM615-FET Schematic

SERVICE MANUAL MANUEL D'ENTRETIEN WARTUNGSHANDBUCH

CAUTION:

Before servicing this chassis, it is important that the service technician read the “Safety Precautions” and “Product Safety Notices” in this service manual.

No. 0419

CM621FET

Data contained within this Service manual is subject to alteration for improvement.

ATTENTION:

Avant d’effectuer l’entretien du châassis, le technicien doit lire les «Précautions de sécurité» et les «Notices de sécurité du produit» présentés dans le présent manuel.

VORSICHT:

Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise“ und „Hinweise zur Produktsicherheit“ in diesem Wartungshandbuch zu lesen.

Les données fournies dans le présent manuel d’entretien peuvent faire l’objet de modifications en vue de perfectionner le produit.

Die in diesem Wartungshandbuch enthaltenen Spezifikationen können sich zwecks Verbesserungen ändern.

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

Colour Monitor

June 2001

1. DISPLAY ALIGNMENT...............................................................1

A. Times & Display Size................................................................................................... 1

B. Picture Position.............................................................................................................1

C. Linearity........................................................................................................................ 1

D. Alignment Procedure.................................................................................................... 2

E. Geometry Distortion ..................................................................................................... 2

F. Tilt................................................................................................................................. 2

G. White Balance Alignment ............................................................................................ 3

H. Preset Timing................................................................................................................4

2. CONTROL AND CONNECT LAYOUT ........................................5

A. Main PCB .....................................................................................................................5

B. Video PCB ....................................................................................................................6

C. Pin Assignment............................................................................................................. 7

3.INTRODUCTION.......................................................................... 8

A. Power Supply................................................................................................................ 8

B. Deflection ..................................................................................................................... 8

C. Video ............................................................................................................................ 8

D. Digital Controllor ......................................................................................................... 8

4. POWER SUPPLY ....................................................................... 11

A. Rectifier and Filter Circuit ........................................................................................... 11

B. Flyback and PWM Circuit............................................................................................ 11

C. Subber Circuit............................................................................................................... 11

D. Synchronized Circuit.................................................................................................... 11

E. Power Saving Circuit .................................................................................................... 11

F. Degauss Circuit ............................................................................................................. 12

G. Overload Protection Circuit ............................................................................ 12

5.DEFLECTION ..............................................................................13

A. Sync Processor.............................................................................................................. 13

B. Horizontal Processor..................................................................................................... 13

C. Vertical Output ............................................................................................................. 13

D. Dynamic Focus Section................................................................................................ 13

E. Horizontal Output Stage ............................................................................................... 13

F. Flyblack Transformer.................................................................................................... 13

6.VIDEO AMP. CIRCUIT................................................................. 16

A. Video PRE. AMP. ........................................................................................................ 16

B. Video Amplifier............................................................................................................ 16

7. TROUBLESHOOTING ................................................................19

A. Power Supply Check .................................................................................................... 19

B. Monitor Check Flow Chart........................................................................................... 20

APPENDIX A: SCHEMATIC DIAGRAMS ......................................23

APPENDIX B: DISPLAY UNIT ASSEMBLY DIAGRAMS .............27

APPENDIX C: PART LISTS ..........................................................29

WARNING

1) This product contains components which are critical for X-radiation safety. Read the Service manual carefully for proper replacement. Maximum 2nd anode voltage use high impedance meter, connect (-) to chassis, use a high voltage lead from (+) to 2nd anode.

2) Critical Components are marked with the symbol of in the material list. For continued protection against X-radiation, replace only with same type and rating components.

3) Critical Components are marked with the symbol of # in the material list. For continued protection against Low Radiation, replace only with same part number.

4) This symbol warns the personnel that un-insulated voltage within the unit may have sufficient

magnitude to cause electric shock.

Therefore, it should be read carefully in order to avoid any problems.

1. DISPLAY ALIGNMENT

A. TIMING & DISPLAY SIZE

For all presetting mode shall be within the limitation:

H. WIDTH 300 ± 5mm

V. HEIGHT 225 ± 3 mm

The external control range of the data area, shall be as follows;

Max. horizontal size : overscan the screen

Min. horizontal size : ≤ 285mm

Max. vertical size : over the screen

Min. vertical size : ≤ 202 mm

B. PICTURE POSITION

For all presetting mode shall be within the limitation:

H.PHASE SCREEN CENTER ± 3 mm

V.CENTER SCREEN CENTER ± 2 mm

The external control ranges of display for all modes listed in section 2.4

H.POSITION ≥ 50 mm

V. C E N T E R ≥ 25 mm

C. LINEARITY

The CONTRAST and BRIGHTNESS control shall be properly adjusted at 20 F-L with Full-intensity reverse pattern, then change to crosshatch Pattern 12x10 (H x V), the size of grid of crosshatch pattern in every display mode shall not vary than 5%(P) or 6%(S).If two line is next to each other, 6%(P) or 7%(S) if they are not next to each other. The calculation formula was listed below:

H max - H min V max - V min x100% or x100% H max + H min V max + V min

D. ALIGNMENT PROCEDURE

• Warm up the monitor for at least 30 minutes before adjustment.

• Set the front of CRT to the east.

• Turn all VR set to center position.

D-1. H.V

1. Use front control key adjust the display size about 300mm, adjust VR801 Let the High voltage of Circuit

is 26KV in Timing 68K mode CROSS PATTERN.

E. GEOMETRY DISTORTION

1. Pincushion

Pincushion(top) d1<=2.0mm(p) or 2.5mm(s)

Pincushion(bottom) d2<=2.0mm(p) or 2.5mm(s) Pincushion(leftside) a1<=1.5mm Pincushion(rightside) a2<=1.5mm

”S” distortion <=0.5mm(p) or <1mm(s)

2. Barrel

Barrel(top) c1<=2.0mm

barrel(bottom) c2<=2.0mm barrel(leftside) b1<=1.0mm barrel(rightside) b2<=2.0mm

3. Trapezoid & Parallelogram distortion

a<=2.5mm (p) or 3.0mm (s) b<=2.5mm (p) or 3.0mm (s)

F. TILT

The maximum variation of the display rotation (tilt) shall be such that the following relationship shall be met:

<=0.5 DEGREE FACE EAST

G. WHITE BALANCE ALIGNMENT

G.1 .1 Select timing #6 (VESA 68K 1024X768) with crosshatch pattern, adjust both horizontal and

vertical OSD’s size control to get display size within 300x225p±2mm.

G.1.2 Disconnect RGB signal inputs, adjust OSD’s brightness and G1 control to it’s maximum

position.

G.1.3 Auto alignment (P103 must be short)

Use automatic alignment equipment and program to get color temperature within specified coordinates.

G.1.4 Manual alignment

P103 must be short in order to into factory mode. Select OSD function to color temperature adjustment.

G.1.5 For 9300 colour coordinate(note: the minimum value of RGB bias is 50) adjust bias G to get

Y=311, then adjust bias R to get X=281. Reduce G1 to Y=0.8FL, fine tune bias G to get Y=311,

and let raster color coordinate is X=281

3, Y=311±3, Y=0.8±0.1FL.

G.1.6 Adjust brightness control to get raster is 0.06FL. reconnect R.G.B. input signal and change

pattern to 2 inch square, adjust gain B to get Y=311, gain R to get X=281.]

G.1.7 Check Y=51

G.1.8 Change pattern to fall white, adjust SB to get Y=32

G.1.9 Select 6500 and 5000 colour coordinate separately. Repeat item 2.5.5 ~ 2.5.8 to meet specificity.

6500 X=313 Y=329

5000 X=332 Y=349

1FL, if not adjust G to get Y=51FL, then repeat item 2.5.6

1FL.

H. PRESET TIMING:

PRESET MODE TIMING

MODE H Pixes

d:dot B.G:

1 IBM

VGA

2 VESA 800

3 VESA 800

4 VESA

(Primary)

5 VESA 1280

6 VESA 1024

Remark:

Fd(MHz)

V Lines

640 480

600

1024

768

1024

768

(1). Primary preset: This is primary timing, match the marked (p) item in engineering

(2). Secondary preset: The other preset timing shall match the marked (s) item in

Polar(H/V)

25.175 N/N

49.5

P/P

56.25 P/P

78.75 P/P 108 P/P

94.5 P/P

specification.

Fh(KHz)

Fv(Hz)

31.47

59.94

46.874 75

53.674

85.061

60.023

75.029

63.981

60.02

68.677

84.997

engineering specification.

Th(us)

Tv(ms)

31.778

16.683

21.333

13.333

18.631

11.756

16.66

13.328

15.63

16.661

14.561

11.765

Td(us)

Td(ms)

d:display

25.422

15.253

16.162

12.8

14.222

11.179

13.003

12.795

11.852

16.005

10.836

11.183

Tb(us)

Tb(ms)

A.F:

backporch

1.907

1.048

3.232

0.448

2.702

0.503

2.235

0.466

2.296

0.594

2.201

0.524

Tp(us)

Tp(ms)

D.I:

Pulse

3.813

0.064

1.616

0.064

1.138

0.056

1.219

0.05

1.037

0.047

1.016

0.044

Tf(us)

Tf(ms)

C.H: front

0.636

0.318

0.323

0.021

0.569

0.018

0.203

0.017

0.444

0.016

0.508

0.015

2. CONTROL AND CONNECT LAYOUT

A. Main PCB

B. Video PCB

C. PIN ASSIGNMENT

C-1. Connect Table

P102 P105-P303 P104-P302

1 DETECT V-OUT AFC

2 DDC-SCL OSE-SDA GHD

3 DDC-SDA OSD-SCL G1

4 GND H-out HEATER

5 V-sync 5V

6 H-sync 100V

7 12V

8 ABL

p.s p1 -> p101 for switch board.

C-2. Connect Function

P803 : H-CENTER CONN

P501 : TILT CONN

P802 : CANCEL COIL CONN

P103: PRESET CONN

P902 : DEGAUSSING COIL CONN

P804 : X-RAY TEST PAD

+ 23 hidden pages