AOpen A70PF Service Manual

A70PF

Service Manual

A70PF(RX-777NS) 1 / 33

WARNING

A. IMPORTANT SAFETY INSTRUCTION

B. SPECIFICATIONS

TABLE OF CONTENTS

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----------------------------------------------------------------------4

3

3

C. TIMING CHART

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5

D. ADJUSTMENT CONTROL LOCATION

--------------------------------------

6

7

E. ADJUSTMENT PROCEDURE

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F. BLOCK DIAGRAM

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12

13

G. TROUBLE SHOOTING HINTS

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H. BILL OF MATERIAL

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20

I. EXPLODED DIAGRAM

J. SCHEMATIC DIAGRAM

------------------------------------------------------------29

-----------------------------------------------------------30

31

K. PCB LAYOUT DIAGRAM

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A70PF(RX-777NS) 2 / 33

WARNING

To prevent from fire or shock hazard,do not expose monitor to any rain or any form of water.High voltage is

inside the monitor so please do not remove the back cover of the cabinet if you are not a qualified
monitor engineer.Contact the local dealer or the nearest

AOpen

A. IMPORTANT SAFETY INSTRUCTION

Prior to using this service manual,please ensure that you have carefully followed all the procedures outlined in the
user's manual for this product.

1. Read all of these instructions.

2. Save these instructions.

3. Follow all warnings and instructions marked on the product.

4. Unplug this product from the wall outlet before cleaning.Do not use liquid cleaner or aerosol

cleaner, use a damp cloth for cleaning.

5. Do not use this product near water.

6. Do not place this product on an unstable cart,stand or table.The product may fall,causing serious

damage to the product.

7. Slots and openings in the cabinet and the back or bottom are provided for ventilation,to ensure
reliable operation of the product and to protect it from overheating.Those openings must not be
blocked or covered.The openings should never be blocked by placing the product on a bed,sofa, rug,
or other similar surface.This product should not be placed in a built-in installation,since proper
ventilation is provided.

8. This products should be operated with the type of power source indicated on the marked label.
If you are not sure of the type of power is available, consult with your dealer or local power company.

9. This product is equipped with a 3-wire grounding type plug,a plug having a third (grounding)
pin.This plug will only fit into a grounding-type power outlet.This is a safety feature.If you are
unable to insert the plug into the outlet,contact your electrician to replace your obsolete outlet.Do
not damage the purpose of the grounding-type plug.

10. Do not allow anything to rest on the power cord.Do not locate this product where persons will walk
on the cord.

11. Never push any kinds of objects into this product through cabinet slots as they may touch dangerous
voltage points or short out parts that could result in a risk of fire or electric shock.Never spill any kinds

of liquid on the product.

12. Do not attempt to service this product yourself,as opening or removing covers may expose you to
dangerous voltage points or other risk.Refer all servicing to service personnel.

13. Unplug this product from the wall outlet and refer servicing to qualified service personnel under the
following conditions.

a. When the power cord or plug is damaged or frayed.
b. If liquid has been spilled into the product.
c. If the product has been exposed to rain or water.
d. If the product does not operate normally,when the operating instructions are followed.Adjust

only those controls involved in the operating instructions ,since improper adjustment of
other controls may result in damage and will often require extra work by a qualified
technician to restore the product to normal operation.

e. If the product has been dropped or the cabinet has been damaged.

f.

If the product exhibits a distinct change in performance,indicating a need for service.

branch office if you need help.

A70PF(RX-777NS) 3 / 33

B.SPECIFICATIONS

1. Screen

2. Visible Image Area

3. Active Display Area

4. Synchronization Range

Horizontal
Vertical

5. Power Source

6. Power Consumption

7. Input Signal

Video
Sync.

8. Connection Type

9. Resolution

10. Color Temperature

11. Dimension (W×H×D)

12. Monitor Weight

13. Base Operation

Tilt
Swivel

14. Power Saving
ON

OFF

15. Signal Connector Pin Assignment

Pin No.

1. Red

2. Green

3. Blue

4. Ground

5. Self Test

6. Red Ground

7. Green Ground

8. Blue Ground

9. Not Connected

10. Sync. Ground

17” F&S 0.25mm,Antistatic coating

16.02 inch
306mm (H) × 230mm (V)

30 – 72 KHz
50 – 160 Hz
100 – 240 Vac , 60/50 Hz
75W (max.)

Analog R.G.B. , 0.7Vp-p / 75 Ohm
TTL level,positive or negative polarity
15 Pin D Type
1280 × 1024 pixels
9300ºK / 6500ºK

406 × 417 × 433 (mm)

15.8Kg

- 5º / + 15º

- 45º / + 45º

＜ 75W
＜ 5W

11. Ground

12. SDA

13. Horizontal Sync.

14. Vertical Sync.

15. SCL

A70PF(RX-777NS) 4 / 33

C.TIMING CHART

y

A : Period
B : Active

Preset

Modes

Dot Rate

(MHz)

F.H

(KHz)

A- period

(uS)

B- Active

(uS)

C- Sync

(uS)

D-Back

Porch

E-Front

Porch

F . V

(Hz)

A- Period

(Ms)

B- Active

(mS)

C- Sync

(mS)

D-Back

Porch

E-Front

Porch

H/V

SYNC

C : S
D : Ba ck Porch
E : Front Porch

C

VGA
640

×

480

25.175 28.322

31.469 31.469 37.500 43.269 46.87 53.674 60.023 63.92 63.98 68.677

31.778 31.778 26.667 23.111 21.333 18.631 16.660 15.644 15.630 14.561

25.422 25.422 20.317 17.778 16.162 14.222 13.003 11.852 11.852 10.836

3.813 3.813 2.032 1.556 1.616 1.138 1.219 0.948 1.037 1.016

1.907 1.907 3.810 2.222 3.232 2.702 2.235 2.370 2.296 2.201

0.318 0.318 0.508 1.556 0.323 0.569 0.203 0.474 0.444 0.508

59.941 70.087 75.000 85.0 75.000 85.061 75.029 100.0 60.020 84.997

16.683 14.268 13.333 11.764 13.333 11.756 13.328 9.997 16.661 11.765

15.253 12.711 12.800 11.093 12.800 11.179 12.795 9.387 16.005 11.183

0.064 0.064 0.080 0.069 0.064 0.056 0.050 0.047 0.047 0.044

1.049 1.112 0.427 0.578 0.448 0.503 0.466 0.548 0.594 0.524

0.254 0.222 0.026 0.023 0.021 0.019 0.017 0.016 0.061 0.015

－. － － . ＋ －. － ＋ . ＋ ＋ . ＋ ＋ . ＋ ＋ . ＋ ＋ . ＋ ＋ . ＋ ＋ . ＋

VGA
720

×

400

VESA

640

×

480

31.50

VESA

640

×

480

36.000 49.50 56.25 78.750 67.5 108.00 94.5

VESA

800

×

600

VESA

800

×

600

VESA
1024

×

768

SIEMENS

800

×

600

nc. Width

VESA

1280

×

1024

VESA
1024

×

768

Interlaced

NON NON NON NON NON NON NON NON NON NON

A70PF(RX-777NS) 5 / 33

D.ADJUSTMENT CONTROL LOCATION

A70PF(RX-777NS) 6 / 33

ITEM

rogram Menu.

B+
Adjust

A

E. ADJUSTMENT PROCEDURE

﹟Test Meter

﹡Test Point
﹫Pattern

﹟Digital Voltmeter
﹡D510 Negative
﹫Crosshatch Pattern
(31.5KHz,640x480)

Operation

1. Make the adjustment to the value shown at right
by turning the VR501 on the main PCB.

Adjusting
Value

15.5V
±0.2V

High Voltage
Adjust

B

Preset
Adjust

C

﹟Digital Voltmeter
﹟High Voltage
Probe
﹡Anode Cap-GND
﹫Crosshatch Pattern
(31.5KHz,640x480)

﹫Crosshatch
(31.5KHz,640x480)

1. Turn the power switch of the monitor OFF.

2. Connect high voltage probe to Anode Cap and

GND.

3. Turn the power switch of the monitor ON.
(15 minutes)

4. Make the adjustment to the value shown at right
by turning the VR601 on the main PCB.

1. Uplug the power cord of the monitor.

2. Hold key,then plug the power cord of

the monitor.

3. Hold key,make sure into preset
picture,if not ,please return 1-2.

4. Please following the procedure of selection and

adjusting an item using the OSD system as below
steps for main function adjusent.

Step 1 : Press and relese the OSD control knob to
activate the OSD menu.
Step 2 : Press or key to highlight the desired
option of OSD icon.
Step 3 : Press and release key to acress the
option.The color of the inner area of the
OSD will changed from blue to green.
Step 4 : To make your adjustment,press or
key to decrease the setting.
Step 5 : Press and release key to store
the change.the color of the inner area will
go back to blue.You can select select other
function to make adjustment by or key.
Also you can select exit icon or press
key to exit the OSD menu.

25.5KV
±0.1KV

Contrast :

MAX.

Brightness

MAX.

H-Size :

mm

306
V-Size :
230

mm

H-Posi. :
Center
V-Posi :
Center

Other adj. :

Best Point

A70PF(RX-777NS) 7 / 33

ITEM

rogram Menu.

﹟Test Meter
﹡Test Point
﹫Pattern

Operation

Adjusting
Value

Background
White
Balance

D

Adjust

White
Balance
Adjust

E

ABL

Adjust

F

﹟Color Analyzer
﹫R.G.B off
(68KHz,1024x768)

﹟Color Analyzer
﹟Oscilloscope
﹡Cathode G
﹫3” block
(68KHz,1024x768)

﹟Color Analyzer
﹫Full White
(68KHz,1024x768)

1. Set the contrast to MAX.,Brightness to Y=0.7

K

set color is 9300

using the OSD.

°

2. Set the OSD to COLOR of sub menu and press

knob.

3. Make the adjustment R.G.B BIAS low light to

the value shown at right by using and key.

1. Move the OSD to the R.G.B. DRIVE.

2. Move the OSD to the G DRIVE and make the

adjustment to the value shown at right by using

and key.

3. Move the OSD to the R,B-DRIVE and make the

Adjustment to the value shown at right by using
and key.

1. Set the contrast to MAX.,Brightness to MAX.

2. Make the adjustment to the value shown at right

by adjustment ABL on the OSD menu.

Y = 0.4
±0.1FL
x = 0.283
±0.015
y = 0.297
±0.015

P-P

37V

Y=58FL
x = 0.283
±0.015
y = 0.297
±0.015

Y =

33FL ±3

G

Other
Function
Seting

﹫Full White
(85Hz 1024*768)

1. Set the FREQ. to 73

2. Set the OSD to PROVIEW

3. Set the BURN to Disable

4. Set the DEFO to TDA9116/9118

A70PF(RX-777NS) 8 / 33

ITEM

rogram Menu.

Dynamic
Focus

H

Adjust

Purity
Adjust

I

﹟Test Meter
﹡Test Point
﹫Pattern

﹟Oscilloscope
﹡FBT Pin14
﹫Full White
(31.5KHz,640x480)

﹫Magenta color
(31.5KHz,640x480)

Operation

1. Set the contrast to MAX.,and adjustment

Brightness to the raster just appear.

2. Make the adjustment to the value shown at right
by adjust the VF on the OSD menu.

3. Make the check to the value shown at right by
adjust the HF on the OSD menu.

1. Adjust the purity magnet is in magneta color.

2. Turning two overlapping pawels in opposite

directions.

3. Move them until they are at the same angle,
9 o’clock and 3 o’clock respectively.

Adjusting
Value

VF :
150(17”)
±10V

P-P

HF :
350(17”)
±10V

P-P

Static
Convergence
Adjust

J

﹫

Magenta color

(31.5KHz,640x480)

1. Open the two pawels of the 4 pole magnets to
allow the red and blue vertical lines to unite.

2. Open and rotate the two pawels at a contrast
angle so that the red and blue horizontal lines
can unite.

3. If the vertical lines deviates,open the two powals
at the deviation position and make a monitor
adjustment by changing its angle.

4. Display white crosshatch pattern.

5. Make the red and blue vertical lines at the

center unite with the green by opening the two

6 pole pawels.

6. Rotate the two pawels at contrast angle so that
the red and blue horizontal lines can unite with

the green.

7. If the vertical lines deviate,change the angle of
Pawels from the deviation position.

A70PF(RX-777NS) 9 / 33

A70PF(RX-777NS) 10 / 33

A70PF(RX-777NS) 11 / 33