Acer AM501 User manual

AM 501
Service Guide
15-inch CRT Monitor

Table of Contents
WARNING........................................................................................................................................................................... 1
REGULATION COMPLIANCE............................................................................................................................................ 2
1.0 INTRODUCTION....................................................................................................................................................... 3
2.0 INSTALLATION................................................................................................................................................. 3
2.1 PROCEDURE: .................................................................................................................................................. 3
2.2 CONNECTING THE MONITOR AND STAND................................................................................................... 4
2.3 CHOOSING A WORKSTATION ........................................................................................................................ 4
2.4 THE AC CONNECTION .................................................................................................................................... 5
2.5 THE SIGNAL CABLE CONNECTION .............................................................................................................. 5
2.6 MONITOR TILT AND SWIVEL ADJUSTMENTS .............................................................................................. 6
3.0 FRONT CONTROLS................................................................................................................................................. 7
3.1 USER CONTROLS ........................................................................................................................................... 7
3.2 OSD ICON SUMMARY ..................................................................................................................................... 8
4.0 SPECIFICATION....................................................................................................................................................... 9
4.1 CRT DESCRIPTION ......................................................................................................................................... 9
4.2 INTERFACE SIGNALS ................................................................................................................................... 10
4.3 PRESET TIMING ............................................................................................................................................ 11
4.4 BRIGHTNESS AND CONTRAST.................................................................................................................... 12
4.5 POWER INLET ............................................................................................................................................... 13
4.6 POWER CORD ............................................................................................................................................... 13
4.7 SIGNAL CABLE.............................................................................................................................................. 13
4.8 INTERNAL CONNECTORS ............................................................................................................................ 14
4.9 POWER REQUIREMENTS............................................................................................................................. 14
4.10 VISUAL CHARACTERISTICS ........................................................................................................................ 15
4.11 FUNCTIONAL PERFORMANCE .................................................................................................................... 22
4.12 ENVIRONMENT REQUIREMENTS ................................................................................................................ 23
4.13 RELIABILITY REQUIREMENTS..................................................................................................................... 24
4.14 WHITE BALANCE .......................................................................................................................................... 25
4.15 LUMINANCE UNIFORMITY............................................................................................................................ 25
4.16 FOCUS............................................................................................................................................................ 25
4.17 IMAGE STABILITY (JITTER).......................................................................................................................... 25
4.18 WARM-UP TIME ............................................................................................................................................. 25
5.0 ALIGNMENT PROCEDURE ................................................................................................................................... 26
5.1 B+ VOLTAGE, G1, H. POSITION ADJUSTMENT ..........................................................................................26
5.2 WHITE BALANCE ADJUSTMENT ................................................................................................................. 26
5.3 FOCUS ADJUSTMENT................................................................................................................................... 26
5.4 PRESET TIMING ADJUSTMENT (SHORT P102 OR PRESS RECALL KEY WHEN POWER ON) .............. 26
6.0 OPERATION THEOREM ........................................................................................................................................ 27
6.1 H & V SYNC. PROCESSOR........................................................................................................................... 27
6.2 VERTICAL DEFLECTION............................................................................................................................... 27
6.3 HORIZONTAL DEFLECTION CIRCUIT.......................................................................................................... 28
6.4 X-RAY PROTECTION CIRCUIT...................................................................................................................... 29
6.5 GEOMETRIC DISTORTION CORRECTION CIRCUIT ................................................................................... 29

6.6 VIDEO AMPLIFIER CIRCUIT.......................................................................................................................... 29
6.7 DIGITAL CONTROLLOR ................................................................................................................................ 29
6.8 POWER SUPPLY............................................................................................................................................ 30
6.9 CONTROL AND CONMECT LAYOUT............................................................................................................ 32
7.0 FUNCTION BLOCK DIAGRAM .............................................................................................................................. 33
7.1 MONITOR PORTION ...................................................................................................................................... 33
8.0 POWER SUPPLY PORTION .................................................................................................................................. 34
8.1 TROUBLE SHOOTING................................................................................................................................... 34
8.2 MONITOR CHECK FLOW CHART................................................................................................................. 36
APPENDIX A: PAET LIST………………………………………………………………………………………………………….. 39
APPENDIX B: DISPLAY UNTY ASSEMBLY…………………………………………………………………………………….. 51
APPENDIX C: CRT & YOKE ASSEMBLY………………………………………………………………………………………...61
APPENDIX D: P.C.B.A .ASSEMBLY……………………………………………………………………………………………… 66

1
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.

2
REGULATION COMPLIANCE
This monitor comply to the most current revisions of following regulations:
UL 1950 Standard for safety of Information Technology Equipment
including Electrical Business Equipment.
CSA C22.2 No. 950 Safety of Information Technology Equipment including Electrical
Business Equipment.
EN 60 950 Safety of Information Technology Equipment including Electrical
Business Equipment.
ZH 1/618 Safety regulation for display work places in the office sector.
ISO 9241-3 Ergonomic requirements for office work with visual display
terminals ( VDTz )-Part3 : visual display requirements.
ISO 9241-8 Ergonomic requirements for office work with visual display
terminals (VDTS)-part 8: requirements for displayed colors.
21 CFR 1002.10
and 1002.12
Guide for compliance with television receiver reporting and testing
program requirements.
47 CFR, Chapter 1,
Subpart A, part 15,
Subpart B
A digital device that is marketed for use in a residential
environment not withstanding use in commercial, business and
industrial environments
EN 55 022 Specification for limits and methods of measurement of radio
interference characteristics of information technology equipment.
MPR 1990:8 Test methods for visual display units.
MPR 1990:10 User's handbook for evaluating visual display units.
EMC Directive
( 89/336/EEC )
Council directive of 3 May 1989 on the approximation of the laws
of Member States relating to electromagnetic Compatibility.
LVD Directive
( 73/ 23/ EEC )
Council directive of 19 February 1973 on the harmonization of the
laws of Member States relating to electrical equipment designed
for use within certain voltage limits.

3
1.0 INTRODUCTION
This document is related to a 15" CRT color monitor MM500 to be used with various kinds of graphic
adapters, including IBMVGA, VESAVGA, ERGOVGA, SVGA, UVGA and XGA modes. It is intended as a
mutisync monitor type based on microprocessor unit, capable to support all the video standards. This
monitor, simply adjusting image size and centering by means of the user controls gathered on the front
panel, can support other graphic standards. The monitor is used with 30KHZ to 54KHZ frequency in
horizontal sweep while vertical refresh rate is from 50HZ to 120HZ.
Moreover it offers Power Management and DDC1 and DDC2B features according to VESA
recommendations.
2.0 INSTALLATION
Check the monitor adapter connector in your personal computer system and compare the specifications
with those of the monitor. If in doubt, contact your supplier. Be sure that power for both the personal
computer system and the monitor is switched off; better not even plugged in.
2.1 PROCEDURE:
a. Connect the video cable to the 15-pin female connector of the video adapter at the rear of the
personal computer system. Lock both screws to ensure proper connection.
b. The voltage regulation of the monitor is indicated on the marker plate at the back. Compare this with
the power supply at location.
c. The monitor is equipped with a three-wire power cord and a third-pin earth plug. Make sure that the
power outlet is an earth type as well.
d. Connect the power cord with the AC- plug at the back of the monitor. Because of its relatively high
power consumption, the power cord of the color-monitor is either to be plugged directly into a
wall-mounted AC-outlet or to be plugged into the PC power supply.
e. Turn on the power switches of both the personal computer and the monitor. Visually verify the
presence of power by checking the “power-on” indicator. It will take about 30 seconds to warm up
monitor.
f. Put a data pattern on the screen and adjusts brightness and contrast to a level comfortable to your
eyes.

4
2.2 Connecting the Monitor and Stand

Align the stand’s four tabs with the slots on the bottom of the monitor.
 Insert the tabs into the slots.

Slide the stand towards the front of the monitor.
Figure 1: Monitor and Stand Connection
NOTE: Special protection on control knobs and LED indicator needs to be taken care while you place the CRT
side of side of monitor downwards. Such concern will escape the permanent damage occurred on
encoder and LED lens from excessive pressure.
2.3 Choosing A Workstation
When choosing an appropriate workspace, keep these few things in mind:

A sturdy, level surface.

An electrical wall outlet and a telephone wall jack near the computer.

At least 3-inch clearance at the back of the computer to allow for the required airflow.

Do not place near a window. Exposing the Monitor to direct sunlight for extended periods may
damage the unit.

You may want to use a desk lamp to adjust the ambient lighting for your viewing comfort.
A viewing filter is recommended to reduce eye stress and fatigue.
Figure 2: The Workstation (This bevel is representative)

5
2.4 The AC Connection

Locate the AC port on the rear of the monitor.

Plug the female end of the AC cord into the AC port.

Plug the male end into the power supply.
Figure 3: Connecting the Power Cord
2.5 The Signal Cable Connection

Locate the ON/OFF power switch. See Figure 4.

Make sure that the Monitor power switch is in the OFF position. The OFF position is indicated with a
circular icon.
Figure 4: ON/OFF Power Switch
 Locate the VGA port on the rear of the PC. The signal cable has a standard 15-pin mini D-sub (VGA)
connector. If you are having trouble locating the VGA port, please refer to the documentation, which
came with your PC.

Connect the Signal cable to the PC’s VGA port.
Figure 5: Connecting the Signal Cable

6
2.6 Monitor Tilt and swivel Adjustments
The monitor is capable of both tilt and swivel adjustments.
Figure 6: Tilt Adjustment

With the tilt feature, the monitor is capable of vertical adjustments of +15°to -5°.

The swivel feature allows for horizontal monitor adjustments of +45°to -45°.
Figure 7: Swivel Adjustment

7
3.0 FRONT CONTROLS
3.1 USER CONTROLS
Figure 8: User Controls (This begel is representative)
1 Power Switch 2 Power LED Indicator
Green States Status
ON Turns the monitor on and
off
Light
Light Standby
Light Suspend
Flash Sleep
3 Reset
4 Adjustments
Resets default values.
For adjusting the display in the selected
function.
5 Select button 6 Function LED Indicator
For selecting functions.
1) When the highest or lowest possible setting for a particular
display control has been reached, its corresponding LED will
flash.
2) When the 2nd LED’s light is on, follow the 2nd function’s
indication.
3) When the input timing is not the preset timing, the recall
function will not function.

8
3.2 OSD Icon Summary
Icon Function Function Description
Brightness Adjusts display brightness
Contrast Adjusts display contrast
H. Size Increases and decreases screen width
H. Position Shifts display image right or left
V. Si ze Increase and decrease screen height
V. Position Shifts display image up or down
Pincushion Adjusts concave and convex portion of pincushion effect
Trapezoid Adjusts the top and bottom display widths

9
4.0 SPECIFICATION
4.1 CRT Description
This display unit shall employ a CRT complying with the following specification:
Size: 15 inches diagonal
Deflection angle: 90 degrees diagonal
Electron gun: In-line type
Focusing method: Electrostatic
Focus lens: Bipotential
Convergence method: Magnetic
Surround type: Black matrix
Array: Dot trios
Trio spacing: 0.28 mm dot pitch
Phosphor type: P22 or equivalent
Phosphor persistence: Medium-short
Light transmission: 57% approx.
Anti reflection: Anti-glare treatment
(45÷65 gloss)

10
4.2 Interface Signals
This color display shall have an analog video interface and shall be capable to operate with multiple
horizontal and vertical frequencies. Moreover it shall be capable to support compatible DDC1and
DDC2B signals.
4.2.1 Sync Input
Separate, composite TTL compatible
Polarity Positive or negative
4.2.2 Interface Frequency
Table 1:Interface Frequency
Horizontal line frequency
(KHZ)±500HZ
Vertical frame frequency
(HZ) ±3HZ
31.649 59.94
46.875 75
48.363 60
53.674 85.061
4.2.3 Input Timing Limits
The monitor will accept all timings within the limits of table 2
Table 2: Input Timings Limits
Parameter Horizontal Vertical
Frequency (30 to 54) KHz (50 to 120)Hz
Blanking ≧2.5µs ≧0.4ms
Back Porch ≧1.0µs ≧0.1ms
Front Porch ≦back Porch ≦Back Porch
Sync Pulse ≧0.7µs <0.3ms
>0.03ms

11
4.3 Preset Timing
M454 U-P Default Timing
Table 3
sweep F D C B A
MODE H Pixes
V Lines
Fd(MHz)
Polar(H/V)
Fh(KHz)
Fv(Hz)
Th(us)
Tv(ms)
Td(us)
Td(ms)
Tb(us)
Tb(ms)
Tp(us)
Tp(ms)
Tf(us)
Tf(ms)
d: dot d: display b: backporch p: pulse f: front
1 VGA60 640
480
25.175
N/N
31.469
59.94
31.777
16.683
25.422
15.253
1.907
1.049
3.813
0.064
0.635
0.317
2 VESA75 800
600
49.5
P/P
46.875
75
21.333
13.333
16.162
12.8
3.232
0.448
1.616
0.064
0.323
0.021
3
VESA60 1024
768
65
N/N
48.363
60
20.677
16.667
15.754
15.88
2.462
0.6
2.092
0.124
0.369
0.063
4 VESA85 800
600
56.25
P/P
53.674
85.061
18.631
11.756
14.222
11.179
2.702
0.503
1.138
0.056
0.569
0.018

12
4.4 Brightness and Contrast
Definitions:
Active area This zone can be lighted when the background color is changed from
black to any other color. Its dimensions, in terms of timing correspond to
the "active area "times described in table 3
Raster area Under certain conditions (see table 4) this zone must be visible when no video input is
applied. Width and height of the raster area must be larger than the corresponding
dimensions of the active area.
Border Comprising any area of the screen outside the raster area.
Brightness This control is mainly intended as a raster luminance adjustment.
Contrast This control shall vary the gain of the video amplifier, thus adjusting the contrast
of the displayed images, and shall not have any visible effect on the raster luminance.
Both controls shall not affect the border. Inside this zone the raster shall be always under the minimum
perceptible level and no evidence of retracing(images or distortion)shall be visible on the screen at any
setting of the luminance controls. The user controls shall operate as described on table 4. This check
must be performed under a diffused illumination of 10 lux and on 48k mode (Horizontal frequency).
Table 4
Patterns Setting of user Controls Luminance Limits
Brightness Contrast Raster Area White Area
A Min Any Not Visible *
A Max Min 0.3 ~ 3.0 FL *
B Max Max * 60 FL<=
C Max Max * >29FL
B Min Max Not Visible Visible
B Min Min Not Visible Not Visible
Legend:
*Don't Care
A Black screen @0 mV video level.
B 2
? x 2 ? white box, @700mV video level.
C Full white screen, 100% of the data area @700mV video level.

13
4.5 Power inlet
Power shall be applied to the display device through a standard three wire receptacle NEMA A/5261
or equivalent.
4.6 Power cord
The power cord supplied with the monitor must conform to the International Standards described on part
8.0 and shall have physical and electrical characteristics such that to comply with any other specification
item. The power cord shall be of removable type.
4.7 Signal cable
Signals shall be applied to the display device through a shielded cable, which must be intended as part
of monitor. This cable shall be of a suitable type in order to comply with any specific item, and shall be
terminated in a 15 pin D-Shell male connector type AMP 211350-1 or equivalent, with pin assignment as
follows:
15 pin mini D-sub
1 Red video input
2 Green video input
3 Blue video input
4 Identify output
5 Ground
6 Red video ground
7 Green video input
8 Blue video ground
9 Not connected
10 Logic ground
11 Identify output
12 SDA (DDC1 or DDC2B)
13 Horizontal sync.
14 Vertical sync. (VCLK)
15 SCL (DDC2B)

14
4.8 Internal connectors
All internal connectors for the interconnection of sub assemblies must be distinct in their physical
characteristics or polarization so as to prevent any misconnection which may cause permanent
damage to the display.
4.9 Power Requirements
The display device shall maintain the specified performances in the range described below:
Frequency: 50/60Hz±3Hz
Voltage: 90 to 264 Vac RMS
The following consumption requirements shall be met:
Power consumption: 75W for MPRII & VLMF Yoke
70WforNORMALYoke
Current consumption:1.2 Aac RMS
Note: Current and power consumption are the maximum values allowed in the voltage ranges describe
above.
4.9.1 Power Management
Table 5: Power Management
NO STATE STATE POWER SAVING
HORIZONTAL VERTICA VIDEO
1 ON PLUSES PLUSES ACTIVE NONE
2 STAND-BY NO PLUSES PLUSES BLANKED <15W@90~240VAC
3 SUSPEND PLUSES NO PLUSES BLANKED <15W@90~240VAC
4 OFF NO PLUSES NO PLUSES BLANKED <5W@90~240VAC
The states of power saving function shall be display by LED indication.

15
4.10Visual Characteristics
All factory preset resolutions must guarantee the right display dimension and centering. Other
resolutions can be adjusted correctly with the external controls as per section 2.5.
In all resolution must be possible to adjust the monitor in full screen (overscan mode) by external
controls. The viewing eye angle while performing any dimensional measurement is parallel to the axis of
the picture tube.
4.10.1 Test Conditions
Resolution: any of preset modes
Input level: 700 mV
Pattern: crosshatch after setting full white pattern with
20FL luminance.(Except otherwise indicated)
Brightness control: cutoff position
Contrast control: position after setting full white pattern with 20FL luminance.
Unless otherwise specified, the display shall meet the requirements of this section under any
combination of the following operating ranges:
Image duty cycle: 10% to 90%
Input power: As per section 3.1
Operating temperature: As per section 6.2
Humidity: As per section 6.2
Magnetic field: Horizontal=0 Gauss
Vertical=0.4 Gauss
4.10.2 Display Dimensions
The dimensions of the data area for all presetting mode listed in part 2.3.1,measured along the
horizontal and vertical axes of the screen, shall be as follows:
Horizontal=260±2.5mm
Vertical=195±2mm
The external control ranges of the data area, shall be as follows:
Maximum horizontal size: overscan the screen
Minimum horizontal size: ≦250mm
Maximum vertical size: overscan the screen
Minimum vertical size: 175.5mm

16
4.10.3 Picture Size Variation
The change in display size shall be less than 3mm in width or 2mm in height at full white
pattern.(250x188mm2)
Brightness change from 5FL to 25FL
Temperature change in 25°C±10°C
4.10.4 Display Centering
Figure 9. Describes the pattern for this test. Basically a single pixel white line around the perimeter of the
data area composes it, with marks for the horizontal ad vertical axes. The background is black.
The maximum variation of the display centering shall be such that the following relationship shall be
met:
a | L - R | ≦2.5mm | U - D | ≦2mm
Figure 9: Display Centering
The external control ranges of display position for all modes listed in part 2.3.1 shall be as follows:
Horizontal position: total control range≧40mm
Vertical position: total control range≧25mm
4.10.5 Tilt
The maximum variation of the display rotation (tilt) shall be such that the following relationship shall be
met:
θ≦0.5 degree
Figure 10: Tilt