Acer AC901 Schematic

Acer AC901

19 -inch CRT Monitor

2 Product Specifications

2-1 Specifications

19-inch, (18-inch visual image area) sloted mask, 90 degrees

Picture Tube

Scanning Frequency VGA, Super VGA, 1024x768@75/85 Hz, 1280x1024@85 Hz

Maximum Resolution 1600 dots (H) x 1200 lines (V) @75Hz refresh rate

Display Area 350 mm (H) x 262 mm (V) typical

Display Characters 80 char. x 60 rows on a 10 x 10 matrix

deflection, dot type black matrix, medium short persistence phosphor, dark tint, non-glare/ anti-static screen,

0.26 mm dot pitch

Display Colors Analog Input

Synchronizatin Signals Separate Sync: horizontal/vertical, TTL, positive or negative

Synchronization

Frequencies

Signal Connectors 15-pin, D-shell connector

Video Signals Analog : 0.7 Vp-p, RGB positive

Power Input 120 Watts (maximum) AC rated voltage, 100VAC to 240VAC,

Misconvergence Center Area : < 0.3 mm; Corner Area : < 0.4mm

User Controls

Service Controls PWB-1596/1598 : power voltage adjust (VR801)

Unlimited Colors

Horizontal : 30 to 96 kHz Vertical : 50 to 160 Hz

200VAC to 240VAC for PNST/PNSL models

Power On/Off, Contrast, Brightness, Horizontal Size, Horizontal Position, Vertical Size, Vertical Position, Pincushion, Trapezoid, Pin Balance, Parallelogram, Rotation, Color temperature, Language, Display Frequency, Degauss, Recall, H. Moire, V. Moire

focus 1 , focus 2

Preset Modes 10 (see Table 2-2. Timing Chart)

Environmental

Considerations

Operation temperature : 5oC to 35oC ambient Operation Humidity : 20% to 80% ambient Storage temperature : -40oC to 65oC ambient Storage Humidity : 5% to 95% (non-condensing) Altitude : up to3000m above sea level

2-2 Signal Cable Pin Connections

Table 2-1. Sig nal Cable Pin Assignment

Pin Signal Pin Signal

1 Red video 9 +5V

2 Green video 10 Digital Ground 3 Blue video 11 Ground 4 Ground 12 SDA 5* Ground 13 H-Sync 6 Red ground 14 V-Sync/VCL 7 Green ground 15 SCL 8 Blue ground

Note: * This pin is used f or selftest detection. Connect this pin to ground at the PC end.

2-3 Tim ing Chart

Seperate Sync

Video

Sync

GHL

This section describes the timings that the computer industry recognizes as standard f or computer-generated video signals.

Table 2-2. Timin g Chart

Mode 1 2 3 4 5 6 7 8 9 10

H. Dots 640 720 640 832 800 1152 1024 1600 1280 1600

V. Dots 480 400 480 624 600 870 768 1200 1024 1200

H-freq (kHz) 31.47 37.927 43.27 49.725 53.67 68.681 68.67 75 91.146 93.75

Sync Polarity - - - - + - + - + +

A period us 31.78 26.366 23.11 20.11 18.631 14.561 14.561 13.333 10.971 10.667

B Blanking us 6.356 6.085 5.33 5.586 4.409 3.04 3.725 3.457 2.844 2.765

C Sync us 3.81 2.028 1.556 1.117 1.138 1.28 1.016 1.185 1.016 0.948

D B.P. us 1.907 3.042 2.22 3.91 2.702 1.44 2.201 1.877 1.422 1.501

E Active us 25.42 20.282 17.78 14.524 14.222 11.52 10.836 9.877 8.127 7.901

F F.P. us 0.636 1.014 1.556 0.559 0.569 0.32 0.508 0.395 0.406 0.316

V-freq (Hz) 59.94 85 85 74.55 85 75.062 84.99 60 85 75

Sync Polarity - + - - + - + - + +

G Period ms 16.68 11.759 11.76 13.414 11.756 13.322 11.765 16.667 11.761 13.333

H Blanking ms 1.43 1.213 0.67 0.864 0.578 0.656 0.582 0.667 0.527 0.533

I Sync ms 0.064 0.079 0.069 0.06 0.056 0.044 0.044 0.04 0.033 0.032

J B.P. us 1.02 1.107 0.578 0.764 0.503 0.568 0.524 0.613 0.483 0.491

K Active us 15.25 10.546 11.09 12.549 11.179 12.667 11.183 16 11.235 12.8

L F.P. us 0.35 0.026 0.023 0.04 0.019 0.044 0.015 0.013 0.011 0.011

Horizontal

Video

Sync

Vertical

H.Parameters:

A: Period B: Blan king Time C: Sync Width D: Back Porch E: Active Time F: Front Porch

V.Parameters:

G: Period H: Blan king Time I: Sync Width J: Back Porch K: Active Time L: Front Porch

2-4 Power Saving Function

Note: The monitor will be driven into “Power Saving ” mode by the control signal from the display

controller, as indicated by the amber-color power LED.

Table 2-3. Power Sav ing Function

State Power

Consumption

LE D

Light

ON <120 watts Green

Active

OFF

Th e power saving states will be kept until a control signal has been detected or the keyboard or mouse is activated. Th e recovery time from Active OFF state back to ON state is around 10 seconds.

<3 watts Amber

2-5 TCO Version (Optional)

The monitor meets the TCO 99, NUTEK energy saving, electric and magnetic f ield requirements.

2-5-1 TCO 99 V ersion (Optional)

The emission f rom magnetic and electric field must comply with the limits specified by the Swedish Board f or Measurement and Testing, commonly known as MPR 1990 recommendations. T hese limits are summarized in the Table 2-4.

Table 2-4. TCO 99 Requ irements

VLF/TCO ELF/TCO

Magnetic Field 25 nT 200 nT Electric Field 1 V/m 10 V/m Frequency Range 2~400 kHz 5~2000 Hz Value RMS RMS Distance 30 cm 30 cm Electrostatic

Potential

+/- 500 V +/- 500 V

The monitor is de signed with selected CRT and carefully routed wires around CRT, make sure exactly the same routing s cheme is used when doing CRT replacement.

The TCO 99 scheme is f or international and environmental labelling of personal computers. The labelling scheme was developed as a joint ef fort by the TCO (The Swedish Confederation of Professional Employ ees), Naturskyddsf oreningen (The Swedish Society for Nature Conservation) and NUTEK (The National Board f or Industry and Technical Development in Sweden).

1)`Scope TCO 99 touches on ergonomic qualities, emissions (electrical and magnetic f ields), energy efficiency and

ecology (with demands f or environmental adaptation for both the product and the production processes at the manuf acturing plant).

2) Environmental Requirements The monitor abi des by the environmental demands concerning restrictions on the presence and use of

hea vy metals, brominated and chlorinated flame retardants, CFCs (freons), and chlorinated solvents, among other things. The monitor is also recyclable.

3) Energy Requirements The monitor als o follows the energy requirements that, after a certain period of inactivity, the monitor

shall reduce its power consumption to a lower level in one or more stages.

4) Others The monitor me ets the strict environmental demands for the reduction of electric and magnetic fields,

physical and visual ergonomics and good usability.

Table 2-5. TCO 99 Visual Ergonomics

Feature Standard Description

Linearity 1% or less Difference in length of columns or rows compared to the

corresponding lengths through the center of the monitor. Display Luminance 100 cd/m2 (at least) Luminance

Uniformity Color temperature

variation Reclections from

casing

1.5:1 or less The ratio is between the max to min luminance within the whole active area.

? u'v' 0.01≦

20% / 30g la ss≧ ≦ The reflection ration is on cabinet & table.

3 Control Location and Functions

(1) Function Key (2) Decrease Key (3) Increase Key (4) Select Key (5) Power LED (6) Power ON/OFF

(1) (2) (3) (4) (5) (6)

3-1 Front Panel

3-2 Front Panel K eys Functions

1. Function Key: Display the main menu, and exit the adjustment screen and save adjustments.

2. Decrease Key: Scroll across main menu, highlighting control to be adjusted. Decrease value of selected control. Toggle between Contrast and Brightness adjustment screens.

3. Increase Key: Scr oll across main menu, highlighting control to be adjusted. Increase value of selected control. Toggle between Contrast and Brightness adjustment screens.

4. Select Key: Press once to display adjustment screen. Press again, f or some controls, to toggle between controls shown in pairs on main menu.

5. Powe r LED: Display different modes (ON, OFF) of the monitor by showing different color for each mode.

6. Power ON/OFF: To turn the monitor ON and OFF .

3-3 Adjustm ent Procedure

1. Press (6) key to turn on the monitor.

2. At normal condition, press (1)on the f ront panel to activate the on-screen manager (OSM) menu.

3. To select a user control, press (2) or (3) key repeatedly until the control is highlighted.

4. To adjust the value for a particular control, press (4), then press the (2) or (3) key to obtain the desired value. Th ere are a few parameters that do not require any adjustment, like Manual Degauss, Memory Recall.

5. Some controls are grouped in pairs on the main menu. Press (4) key to toggle between them.

6. To save your adjustments and exit screen, press (1) key. The menu will automatically clear out f rom the screen if no keys are pressed within 30 seconds.

Note: To enter the “Internal Adjustment” mode, press (1) & (4) keys simultaneously then press (6).

4 Operation Theory

Thi s is a fully digital controlled multi-sync color monitor that is compliant with DD C1/2B Plug and Play VESA standard and of fers the following main features.

4-1 Main Features

1. Simplif ied design with minimum components.

2. The NOV ATEK NT68P65AU processor-- that has I2C bus controlled geometric correction, contrast and brightness-- of fers the functions for: (a) Contrast, (b) Brightness, (c) H-size, (d) H-position, (e) V-size, (f) V-position, (g) Pincushion, and (h) Trapezoid, (i) Pin Balance, (j) Parallelogram.

In addition, it also of fers more functions as: (a) Sync. processor, I/P and O/P, (b) Mute, (c) Power saving of f, (d) Power saving override, (e) DDC2B, (f) I2C Bus f or auto-alignment through signal cable (g) CS switching f or linearity and size compensation, (h) High voleage adjustment, (i) G2 voltage adjustment.

3. Stores up to 10 f actory preset modes and offers 6 user modes. There are 18 function icons in OSD. They are controlled by 1 2 keys on the f ront panel.

4. Powerf ul PHILIPS TDA4841 and TDA4863 present the following useful functions: (a) Pincushion, (b) Trapezoid, (c) V-Position, (d) V-Size, (e) Vertical’s “C” and “S” correction -- factory adjust, (f) Pincushion’s V. position cor rection, (g) Corner correction -- factory adjust, (h) Pincushion unbalance correction -f actory adjust, (i) Parallelogram distortion -- factory adjust, (j) Moire cancellation, (k) X-ray protection, and (l) Full horizontal and vertical auto sync capability.

5. Sof tware controlled auto shut off function activated if fH < = 29 kHz and fH > = 96 kHz.

6. Full range AC input and simplif ied line filter design.

4-2 Microcontrol Section

1. This monitor uses NO VATEK NT68P65AU CPU. It contains a 8-bit CPU core, 256 bytes of RAM used as working RAM and stack area, 24k bytes of OT P ROM, 14-channel 8 bit PWM D/A converter, 2channel A/D converters f or key detection saving I/O pins, internal H. sync and V. sync signals processor providing mode detection, and an I2C bus interf ace. When H/V sync through D-Sub signal cable enter pin 41 and pin 42, the CPU perf orms frequency / polarity detection and calculate and send to H/V sync OUT. Then C PU reads the data from I703 and transfer to device 4841 and some DAC in CPU, above operation takes about 500 ms.

2. There allows 10 factory preset modes and 6 user modes. There are 8 f unctions, Contrast, Brightness, H. Size, H. Position, V. Size, V. Position, Pincushion, and Trapezoid, all controlled by OSD icon which can be adjusted by user.

3. The pin 25 and pin 26 are used f or ATE function. When CPU receives C6 as slave address, it will operate in A TE mode which is use d for auto-alignment. After alignment the data will be stored in I703.

4. The us er control parameters are selected by OSD icons, through 1 2 keys , they are detected by sensing the voltage through R710, R759, R713, R714, R709, R711, R760 to pin 16 and 17 of I701.

4-3 Deflection Section

1. I2C -- autosync def lection controller is TDA4841.

2. The TDA4841 is a high performance and efficient solution for autosync monitors. All functions are controllable by I2C bus. SDA and SCL signals coming f rom microprocessor feed to pin 19 and pin 18 to control all f unctions.

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