Color monitor full 17" (16.0" diagonal viewable) (17 pages)
Summary of Contents for Nokia 445PRO
Nokia Display Products Oy Chassis 445N P .O.Box 14 FIN---24101 Salo, Finland 21” High Resolution Colour Monitor 445PRO Contents Service Monitor Dismantling Part List PCB Part List PCB Layout pictures Level Main Board module ..
1. Product Overview 445N is a 21 inch monitor. The maximum resolution of 1800 x 1440 makes the monitor suitable for PC, Macintosh and workstation applications in normally heated, ventialed and controlled office/home environment. The monitor has an own power supply with nominal input voltage requirements from 90 V to 264 V.
Video Blanking V Blanking V Active Video V Back Porch V Front Porch V Sync V Sync. Signal 445PRO (445N051, 445N059) Display Mode no N07A85 L91--- 85 L80--- 75 G69--- 85 E54--- 85 C43--- 85 B31--- 70 C31--- 60...
1.5. Monitor Connection Make sure that the monitor is disconnected from mains and the power switches of the com- puter and all attached devices are turned off before connecting the monitor. Connect the signal cable plug to the videocontroller connector at the back of the computer. Tighten the screws on the plug by hand.
1.6. User Controls 1. Power switch 2. Power on indicator 3. Menu button 4. Select and adjustment buttons When the power is turned on, the power- -on indicator will light. The colour of the the power--on light indicates the operating state of the monitor. Green: The monitor is in Normal, Stand---by or Suspend operation.
1.7.Menu 1.7.1. Moving in the menu Menu operations are controlled with button and buttons. Call the menu to the screen by pushing the button. Select the header with the buttons. Push to confirm the selection. Adjustment and settings corresponding the header appear below the header field. Select the adjustment with the buttons.
2. Site Preparation 2.1. Location This Monitor is designed for normal office conditions. It is equipped with own power supply. It is not to be serviced or repaired on site 2.2. Troubleshooting Local service facilities should perform simple maintenance such as trimming. More advanced main- tenance and repair that requires replacement of components which in turn requires testing and re- trimming should be carried out in a central workshop.
2.3. Checking the Operation of PowerSaver The proper operation of the function requires a computer with VESA DPMS power management capabilities. Note that the power saving feature must be activated in the computer when checking the operation. State Colour of the power--on indicator Heater Video Normal Operation...
3. Controlling the Memory for Picture Adjustments The picture adjustment values are stored in non-volatile memory. The memory has separated areas for User Adjustments and for Factory Adjustments. 3.1. Memory for User Adjustments 3.1.1. Adjustment If there are values available in the memory for user adjustments, corresponding to the present timing signals, they are always used.
4. Service Mode Service Mode is needed for updating of the factory adjustments for display mode listed in the chap- ter Preset Display Modes. If there is no location in factory adjustment memory for display mode cur- rently in use, the adjustment affects the memory for user adjustments. 4.1.
4.2. Service Menu 4.2.1. Access to Service Mode Activate 9300K color temperature before you go to the service menu. Activate the service mode always in 107.10 kHz/85 Hz (NCE791). First switch OFF the monitor with power switch. 1) Push button down. 2) While keeping button down, switch ON the monitor.
5. Workshop Maintenance 5.1. Important Safety Notice The components, which are important for safety, are marked with special mark ! on the circuit dia- gram. It is essential that these critical parts should be replaced with manufacture’s specified parts to prevent X--radiation, shock, fire or other hazards.
5.5. Disassembly 5.5.1. Cabinet Set the monitor on cushion picture tube facing down 1. Loosen and remove two screws. 2. Open the plastic pawls with a screwdriver or special tool (for instance 860006) Screw Push open Do not twist on both sides 445N...
6. Image performance Measurement to verify this specification shall be made with equipment that measures the displayed image as if it were projected forward onto a flat plane tangent to the center of the CRT faceplate sur- face and perpendicular to the Z---axis of the CRT. Image performance specifications are applicable over specified input power conditions, specified environmental operating conditions and after being subjected to the specified non---operating en- vironmental conditions.
6.3 White Uniformity Measurement conditions: --- Full screen picture size, Brightness in middle 100 nit --- Magnetic field horizontal Gauss vertical 0.45 Gauss --- Warming up time 1 hour Maximum variation between colour coordinates between any measurement points shall not vary more than d(x),d(y) below.
6.6 Image size Display size is defined as the width and height of the display using the active raster, not including the border. Measurement: Full white field brightness set to 100 nits (29.2 Ft ---L). Cross---hatch test pattern. The width and the height are measured at the center of the screen. Requirements: Nominal size: Width = 393 ±...
6.10 Jitter Image motion in terms of dynamic pixel displacement shall be defined as jitter. (MPR 1990:10, 1.07) The horizontal and vertical displacement of any pixel using the ”convergence” dot and cross hatch pattern measured using microscope with appropriate magnification. The maximum displacements in both the horizontal and vertical directions must be less than 0.1 6.11 Chromaticity Factors affecting chromaticity include colour set up, temperature and tracking, colour purity and...
6.14 High voltage regulation With a full load white field, at nominal input power supply voltage, brightness at minimum, from the minimum to maximum contrast settings, the size shall not change more than 0,5 % . 6.15 Blinking image Image motion shall be defined as the displacement of the active display when changed from a no load pattern to a full load pattern at a 1.0 Hertz rate.
7. Adjustment Procedure The following procedure must be carried out in case of large service operations e.g. when a circuit board or nonvolatile memory ICA has been replaced by a new one. The order of adjustments explained here has been found to produce the desired result with the mini- mum of effort.
7.2. Preliminary Preparations Connect the signal cable to the PC. Switch on the monitor and the PC. Let the monitor warm up for 20 minutes before starting the adjustments. 7.2.1. High Voltage Select 107.10 kHz/85Hz (NCE791) crosshatch test pattern. Connect the high voltage meter to the anode of the picture tube. Adjust the high voltage to 27.0 ±0.2 kV with RT301 on SMA--board.
7.3. Geometry Magnetic fields for following adjustments: vertical 0.45G and horizontal 0.0G. Activate Service Mode in 107.10 kHz/85.0Hz (NCE791). Degaussing must be carried out before the picture adjustments. Degaussing shall be repeated if the monitor is moved. 1) Select 107.10/85.0 (NCE791) crosshatch test pattern. to maximum and adjust until the background is faintly visible.
7.4. Grey Scale The grey scale is adjusted for 9300K colour temperature. Activate Service Mode in 107.10 kHz/85Hz (NCE791). 7.4.1. The Most Dominant Colour The most dominant colour has been marked in a label on the deflection yoke. It may not be correct if tube or SMH card has been changed. In that case judge the most dominant colour from the tone of the picture after you have made the following adjustments.
7.7. Convergence Reduce first the convergence error in the middle of the screen to minimum using static adjustments. After the convergence is faultless in the middle of the tube, use dynamic adjustments to eliminate the error in the edges of the tube. Static adjustments affects the whole picture area: Magnet ring set on the tube neck (horizontal + vertical) Dynamic adjustments affects a part of the picture area:...
7.8. Installing serial number to processor Parallel cable Power cable Signal cable of monitor You will find serial number on rating label behind of back cover. Use NDP repair software version 8.201 or newer to create the serial number. 7.9. Magnet rings Do not move purity magnet rings.
8. Screen and Faceplate Blemishes 8.1. Definitions of inspection conditions and terms 8.1.1. Standard observing condition Distance: 30 cm from screen face. Angle 45 from Z axis. Cosmetic inspection without raster should be done under luminance: 500lx MIN. 8.1.2. Zone division 302.2 mm other screen area 8.1.3.
8.3. Glass blemish 8.3.1. Scratch Width Length of single scratch W< 0.05 No limit 0.05<W<0.10 0.10<W<0.15 W> 0.15 None allowed 8.3.2. Bubbles/Foreign materials Bubbles Average diameter of defects Quantity allowed within any Minimum distance circle 0.3---0.45 12.7 Air blister (Max. legth 6.0) 12.7 (Max.
NOTE! DEMA Safety components marked with R137 R138 Q104 Q102 must be replaced with original or approved components only. PTC102 PTC101 All printed boards and the back cover are also safety components. D115 UC7112 RE101 LL4148 QH0074 C102 NTC101 D101 T111 D116 M101...
Part Item Number Description SMA251 MAIN BOARD 445N AA0715 CF RES 0W25 56K J 2.5- -7 AG3365 MF RES 0W5 464R F TC50 2.5 foil AJ2463 MO RES 2W0 5R6 J 6- -17 RA244 AJ2523 MO RES 2W0 10R J 6- -17 RA221 RA222 AJ2763 MO RES 2W0 100R J 6- -17...
Part Description Item Number JL0069 OPTOCOUPLER VRMS 5KV IC102 IC103 IC106 JM0334 TR BD135 NPN 45V 1A5 250MHZ TO T219 JM0341 TR BUH1215(435B) N 1500V 19ATO T206 JS0019 FET IRF640 N 200V 18A TO22 T207 JS0078 FET STP7NB60FP N 600V 3.5A 1R2 T201 JS0051 FET IRF9540 P 100V 19A 0.2R TO...
Part Item Number Description AA0729 CF RES 0W25 220K J 2.5- -7 RA463 AA0731 CF RES 0W25 270K J 2.5- -7 RA229 AA0737 CF RES 0W25 470K J 2.5- -7 RA107 RA108 RA128 RA129 AA0741 4F RES 0W25 680K J 2.5- -7 RA249 AA0754 CF RES 0W25 2M2 J 2.5- -7...