Apple Multiple Scan Display 1705 User's Manual
Contents
1. 3 k a TT 00006 40 T X 1442 COLON AND COSINE CORRECTED m JAANE LILE d i vail Important If you suspect the light meter is giving false quip o Adjustments Manufacturing Date Stamp Non User Adjustments 17 readings verify the readings with a known good light meter or photometer Also check the age of the R77 light meter by its four digit manufacturing date stamp such as 0398 for March 1998 Caution Dropping the meter can permanently damage its accuracy A shock damaged meter might read incorrectly or its pointer may not drop to zero lol Adjustments Non User Adjustments 18 Model 246 Metal Slide Note Follow this procedure to set up the meter when making brightness adjustments 1 Remove the metal slide if installed and insert it into the slot on the back of the meter Petal Slide quip ia Adjustments Non User Adjustments 19 White Disk Lens Note The white disk lens is removed only for some procedures 2 Remove the white disk lens Turn it counterclockwise so the dot on the lens aligns with the dot on the meter and pull the lens from the meter quip lol Adjustments Non User Adjustments 20 3 Rotate the lens head of the meter to face the monitor quip ol Adjustments Non User Adjustments 21 4 Hold the lens against the middle of the monitor screen o Adjustments Non User Adjustments 22 Model L 248 Note2. Service Source Apple Multiple Scan 1705 Display gt Service Source Basics Apple Multiple Scan 1705 Display lt qu gt le Basics Overview The Apple Multiple Scan 1705 Display is a low cost monitor with a 17 inch CRT 15 8 inch viewable image size This monitor comes with a Macintosh to VGA adapter so it can be used with most IBM PC compatible computers equipped with VGA or greater capability Features Features of the 1705 monitor are e A 17 inch color display e Three different and independent lines to drive for red green and blue e 111 5 MHz bandwidth e High resolution CDT Color Display Tube display Horizontal 1280 dots Vertical 1024 lines without blurring e Analog compatibility at an H frequency of 30 to 65 8kHz This monitor is thoroughly checked and adjusted for an optimum picture before it leaves the factory However there may be some minor adjustments needed depending on the particular location in which the monitor is operated lt gt Adjustments that can be made with the user controls are Brightness Contrast Horizontal center Width of picture Vertical center Picture height Picture curvature Picture side alignment Degauss Factory settings can be restored by pressing the Down and Up buttons at the same time quip Troubleshooting and Repair Tips The monitor stand does not need to be removed before the rear housing is removed When th
3. read about 6 VDC yes Y 1 Replace Main Deflection CRT Video Rear Fence See Take Apart chapter 1 Check interconnect cable and connectors P 702 P 703 and P 302 See Picture B Are cable and connectors okay no 2 Adjust cutoff and white balance See Adjustments Chapter Replace video interconnect cable See Take Apart Chapter lt gt Troubleshooting No Raster Flowchart Continued 19 No Raster Flowchart Continued B Y Slowly turn screen the control on the flyback transformer clockwise See picture C 1 Replace Main Deflection CRT Video Rear Fence See Take Apart chapter 2 Adjust cutoff and white balance See Adjustments Chapter A Does raster become visible Adjust cutoff and white balance See A djustments Chapter Was outcome successful no 10 Service Source Take Apart Apple Multiple Scan 1705 Display 407 Special Safety Precautions 1 Special Safety Precautions The only potential source of X Radiation is the CRT When the high voltage circuitry is operating properly there is no possibility of an X Radiation problem Keep the high voltage at the factory recommended level of 26 kV This voltage must not exceed 29 kV at zero beam current at rated voltage See Adjustments chapter for checki
4. 28 3 Adjust VR701 H RASTER CENTER so the z picture is horizontally centered on the screen g Adjustments Brightness i Contrast Non User Adjustments 29 Focus Adjustment Before you begin remove the following e Rear Housing e EMI Shield 1 Using Display Service Utility select the display pattern containing nine gray boxes on a dark field 2 Set the user controls to maximum brightness and contrast clock wise o Adjustments Non User Adjustments 30 3 Adjust the focus at VR F1 and F2 on the flyback transformer until the focus test pattern reaches the best possible focus at the center of the screen Non User Adjustments 31 High Voltage Adjustment Note Adjust the high voltage whenever a module is replaced or if the setting at VR501 was accidentally changed Before you begin remove the following e Rear Housing e EMI Shield quip Adjustments CD 12 in 300mm wwgzz Ul 6 1 Non User Adjustments 32 Using Display Service Utility select the display pattern containing a grid ona white field Using the height and width controls on the front control panel and a plastic ruler adjust the screen size to 12 inches 300 mm by 9 inches 225 mm o Adjustments VRSO1 High altage Adjustment D 709 Cathode Non User Adjustm
5. At the end of this chapter there is a drawing locating all of the adjustment points You may want to print it out quip Non User Adjustments 13 Light Meter Setup Note When a color analyzer or photometer are not available use an R77 a 246 or an L 248 light meter to measure the brightness of the monitor screen Model R77 Apple part number 076 0310 is the newest light meter model available quip lol Adjustments Non User Adjustments 14 Model R77 L eas The R77 light meter is capable of reading luminance from 10 to 1 000 footcandles fc Before you begin remove 200 1000 fe the 10X multiplier plate 50 250 fe from the lens 10 50 fe quip Non User Adjustments 15 lol Adjustments 200 1000 fe AT 6 EO BOO ra 50 250 fc eMo to 2 10 50 fe mee Na coin Three scales are shown on the light meter e 200 1000 fc e 50 250 fc e 10 50 fc Because display screen luminance typically ranges from 10 to 50 fc take readings from the bottom scale only quip ei Adjustments Non User Adjustments 16 To measure a display screen s luminance ae 1 Set the scale switch to the bottom position to set up the 10 50 fc scale 4 Seale Switch at Bottom 2 Place the lens against the middle of the screen and read the bottom scale Note When the light meter is not in use slide the scale switch to its top position and store the meter in its protective case
6. Deflection CRT Video Boards and Rear Fence in Take Apart Adjust cutoff and white balance See Cutoff and White Balance in Adjustments quip fa Troubleshooting Screen is blurred Raster is too bright Symptom Charts Video Continued 9 Video Continued 1 w Adjust Focus at VR F1 and F2 See Focus Adjustment in Adjustments Doublecheck focus Replace the video and main deflection boards See Main Deflection CRT Video Boards and Rear Fence in Take Apart Adjust cutoff and white balance See Cutoff and White Balance in Adjustments Adjust brightness control See User Adjustments in Adjustments Adjust cutoff and white balance See Adjustments Doublecheck items 1 and 2 Replace video and main deflection boards See Main Deflection CRT Video Boards and Rear Fence in Take Apart Adjust cutoff and white balance See Cutoff and White Balance in Adjustments lt i gt Troubleshooting Symptom Charts Video Continued 10 Video Continued Colors are too green 1 Ensure that the video card or computer video port is good by red or blue and the connecting a monitor that is known to be good screen is unreadable 2 Ensure that the video cable is properly connected and the thumbscrews are secure If a video card is used the video cable must be properly attached to it 3 Adjust cutoff and white balance See Cutoff and White Balance in Adjustments 4 Doubleche
7. Injury or damage to equipment may occur 6 7 8 9 Turn off monitor Unplug monitor Remove the probe from under the anode wire connector Go to the No Raster Flowchart Bd Avode Wire SEE a E Connector ne lt i gt o Troubleshooting Checking High Voltage 16 Note Refer to these pictures when using the No Raster Flowchart Ft 5 oan ee I 0 a its N REMIR S oh it ep Video Inte rca nnect f Cable Sereen Control Troubleshooting No Raster Flowchart 17 No Raster Flowchart No Raster Flowchart Check High Voltage Did multimeter read 25 0 VDC 25 kv 1 Replace Main Deflection CRT Video Rear Fence See Take Apart chapter 2 Adjust cutoff and white balance See Adjustments 1 Set multi meter to DC 2 Attach ground probe black to monitor frame 3 Touch multimeter red probe to CRT socket pin H See picture A Does multimeter no read about 6 VDC Check the computer and video card Chapter END Go to A Are the computer and video card Fix computer or video card okay yes Go to lt gt Troubleshooting No Raster Flowchart Continued 18 No Raster Flowchart Continued A Y Measure voltage at pin 8 labeled 6 3V See Picture A Does multimeter no
8. Non User Adjustments 41 Cutoff Adjustment Note If presets were done correctly when the white screen is displayed using Display Service Utility the screen will have a blue tint If the blue tint is not present redo the presets 1 In the monitor control panel set the monitor operation to 832x624 2 Using Display Service Utility select the all white screen quip o Adjustments Non User Adjustments 42 3 Adjust the screen control until the display luminance measures e 10 on the bottom scale of light meter model R77 e Between 5 and 10 on the lower scale of light meter model 246 e Between 5 and 10 on the 2 10 scale of light meter model L 248 oF e 0 3 foot lamberts ona Screen photometer or color Control analyzer F oi Adjustments Non User Adjustments 43 Note VR304 and VR303 may have to be adjusted several times to obtain a neutral gray 4 Use Display Service Utility to select the gray bars pattern and adjust VR304 G BIAS until the screen is blue green equal amounts of blue and green 5 Adjust VR303 R BIAS until the screen is neutral gray no color present o Adjustments Non User Adjustments 44 6 Adjust VR305 SUB BRIGHT until the display luminance measures e Between 15 and 20 on the bottom scale of light meter model R77 e Between between 15 and 20 on the lower scale of light meter model 246 e Between 5 and 6 on 2 10 scale of light m
9. Take Apart Rear Fence Internal Video AC Inlet Assembly 53 11 Carefully straighten the tabs on the cover shield plate 12 Remove the cover shield plate from the video board Replacement Note Do not bend the cover shield plate tabs more than necessary They are easily broken o Take Apart Rear Fence Internal Video AC Inlet Assembly 54 13 Disconnect the twelve wire cable from P301 on the video board e Insert a small flat blade screwdriver between the connector and tab e Gently move the tab away from the connector and work one side of the connector up until it clears the tab Sad Screwd Aver o Take Apart Screw Rear Fence Internal Video AC Inlet Assembly 55 e Repeat this procedure for the other side of the connector and remove 14 Remove two screws securing the rear fence to the top of the main bracket all Take Apart Rear Fence Internal Video AC Inlet Assembly 56 15 Remove two screws securing the fence to the back of the main and bottom brackets 16 Slide the rear fence up and remove it from the main and bottom brackets Video Interconnect Cable 57 Video Interconnect Cable Before you begin remove the following e Rear Housing e EMI Shield Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury or equipment damage review the CRT safety and discharge instructions in Bulletins Safety C
10. book about 3 x 11 x 8 next to the monitor Lift the monitor from the protective surface and set it on the object Position the monitor so the CRT and the lower edge of the bezel are supported by the object lt i gt o Take Apart Bezel 34 4 Remove two screws securing the ground straps to the bottom bracket o Take Apart Bezel 35 5 Remove four screws securing the left and right side brackets two screws each to the bezel 6 Remove the two screws securing the main bracket to the bezel Bracket Sc re ws Bottom Bracket Screw Main Bracket Sc ree o Take Apart Bezel 36 7 Remove the four screws securing the D coil holders and CRT to the bezel Replacement Note Be sure to install the D coil holders when installing the screws Screw Two Screws onthe Other Side Screw lol Take Apart Bezel 37 Slide 00110 jay nE PESE 8 Gently slide the monitor so the bezel is no longer supported by the object and let the bezel rest on the protective surface Caution The CRT and deflection board are connected only by cables Support both when lifting or connectors may be damaged Caution User brightness and contrast controls will not support the weight of the video and deflection board assembly Set the assembly on supports or the controls may be damaged lt p gt o Take Apart Controls Support 9 Bezel 38 Position two suppo
11. from both connectors Take Apart Video Interconnect Cable 64 Insert a small flat blade screw driver between the connector and the tab e Gently move the tab away from the connector and work one side of the connector up until it clears the tab e Repeat this procedure for the other side of the connector o Take Apart Video Interconnect Cable 65 8 Carefully straighten the tabs on the cover shield plate 9 Remove the cover shield plate from the video board Replacement Note Do not bend the cover shield plate tabs more than necessary They are easily broken o Take Apart Video Interconnect Cable 66 10 Disconnect the 12 wire cable from P302 on the video board e Insert a small flat blade screwdriver between the connector and tab e Gently move the tab away from the connector and work one side of the connector up until it clears the tab Video Interconnect Cable 67 e Repeat this procedure for the other side of the connector 11 Remove the cable from the monitor 407 Tail Take Apart 68 Multiple Scan 1705 Display Simplified Wiring Diagram 1090 2 e oo es TT ub pi i i b P901 P703 SAR So h P6
12. gt lol Troubleshooting Symptom Charts Miscellaneous 13 Miscellaneous Indicator light goes The LED will go out after 10 seconds by design This is a normal out before function adjustment of display controls is completed lt a gt lol Troubleshooting Checking High Voltage 14 Checking High Voltage Awarning Read all of the warnings notes and steps of this procedure before beginning Awarning Voltage at the anode with the power on can cause serious injury Doublecheck all multimeter connections before taking the reading warning Probe the anode carefully Serious damage and injury may occur if the anode is knocked off while the CRT is charged Note Do not attempt this procedure without the Apple high voltage probe Use only the Apple high voltage probe Other high voltage probes will not give accurate readings for this procedure quip ol Troubleshooting Checking High Voltage 15 Before you begin remove wm AUN Rear Housing EMI Shield Attach the Apple high voltage probe to the multimeter and attach the ground wire to the chassis Be sure the monitor is attached to a computer and has power Turn on the monitor Carefully insert the probe under the anode wire connector The reading should be 25 VDC on the meter This is actually 25 kV Most of the voltage is across the high voltage probe Warning Do not remove the probe from under the anode wire connector until power is turned off
13. 01 i E j P701 P702 P704 AC Socket i lo e cH lt a gt Service Source Additional Procedures Apple Multiple Scan 1705 Display lt u gt Introduction 1 Introduction The Adjusting the Degaussing Coils procedure describes the proper position of the degaussing coils in relation to the CRT corners and the canceling coil Follow this procedure whenever you take apart or reassemble a unit Important To maximize performance of the Apple Multiple Scan 1705 Display the degaussing coils must e Remain securely attached to the corners of the CRT e Remain at least 1 25 inches 30 mm from the bottom canceling coil on the yoke of the CRT lt u gt lol Additional Procedures Adjusting the Degaussing Coils 2 Adjusting the Degaussing Coil Degaussing Coils Before you begin refer to the Take Apart chapter to remove e Monitor stand e Rear housing e EMI shield lt p o Additional Procedures Tab Degaussing Coil Adjusting the Degaussing Coils 3 1 At the top two corners of the CRT release the degaussing coil from the two bendable tabs Lower the degaussing coil so its top corners are positioned at least 2 inches 50 mm away
14. 4 bit 16 7 million colors 24 bit 16 7 mil lion colors quip Characteristics 6 Video Source Cards 498 8 24 8 24GC Macintosh Il IIx Ilex 11 Macintosh Ilci 1161 Macintosh LC 475 Quadra 605 Macintosh LC LCI LCIII Macintosh Power Books PowerBook duo Dock Third Party Cards Standard Configuration This group of computers and cards are not directly compatible with the 1705 Multiple Scan Display They require a Macintosh Display card 24AC a third party adapter or third party software With Additional Memory lt u gt ia Specifications Controls and Ports 7 Controls and Ports User Controls Power Front panel brightness and contrast control knobs degauss button down and up buttons which also perform the recall function and select buttons to reset factory settings and adjust size shape alignment and borders of picture T O Ports Power cord receptacle and video port lt u gt ia Specifications Physical and Electrical 8 Physical and Electrical Power Supply Universal power supply Voltage AC 90 264 volts V Frequency 47 63 hertz Hz single phase Power 100 watts W maximum Size and Weight Height 17 6 in 437 mm Width 16 8 in 420 mm Depth 19 6 in 479 mm Weight 45 Ib 20 5 kg Monitor Stand Built in tilt and swivel lt u gt ia Specifications Environmental 9 Temperature Altitude Hum
15. Follow this procedure to set up the meter when making brightness adjustments 1 Press the red button on the back of the meter to check the battery If the reading is out of the red area on the scale replace the battery Fed Area Fed Button lol Adjustments Non User Adjustments 23 2 Slide the scale selector to the lower position to access the 2 to 10 scale Scale Selector 2 10 Scale quip lol Adjustments Non User Adjustments 24 3 Slide the selector to the upper position to access the 10 to 18 scale Scale Selector Scale 10 18 quip lol Adjustments Non User Adjustments 25 4 Slide the diffuser away from the lens when using the meter to read brightness Def user Lens quip ol Adjustments Non User Adjustments 26 5 Hold the lens against the middle of the monitor screen Press Button 6 Press the button on the right to take the reading The needle will lock in place when the button is released g Adjustments Brightness C Contrast Non User Adjustments 27 Raster Center Adjustment Before you begin remove the following e Rear Housing e EMI Shield 1 Using Display Service Utility on the Service Source Companion CD select the display pattern containing a grid on a white field 2 Set the user controls to maximum brightness and contrast clock wise o Adjustments Non User Adjustments
16. RT Video Boards and Rear Fence 18 3 Disconnect the two wire cable from P303 on the video board 4 Disconnect the ground wire from the bottom of the video board o Take Apart Main Deflection CRT Video Boards and Rear Fence 19 5 Remove one screw securing the ground wire to the rear fence Ground Wire o Take Apart Main Deflection CRT Video Boards and Rear Fence 20 Caution Damage will occur if the CRT is marred with pliers when removing the hot glue Note If there is a portion of hot glue hanging from the connector use it to peel the hot glue from the CRT 6 Using needle nose pliers peel the hot glue from the CRT o Take Apart Main Deflection CRT Video Boards and Rear Fence 21 Caution CRT pins are easily damaged Gently rock the video board back and forth while pulling it away from i the CRT Video Board Note If gently rocking and pulling the video board does not loosen it from the CRT remove more hot glue 7 Remove the video board from the CRT o Take Apart Main Deflection CRT Video Boards and Rear Fence 22 Warning Be sure the ey Anode Wire a nl monitor has no power and connector Erene the CRT has been properly discharged Serious injury could occur if the anode wire is removed while the CRT is charged 8 Remove the anode wire connector from the CRT lol Take Apart Main Deflection CRT Video Boards and Rear Fence 23 Caution
17. When the monitor is face down it is resting on the CRT screen The CRT must rest on a protective nonabrasive surface or the screen will become damaged 9 Place the monitor face down on a protective surface Protective Surface lt i gt o Take Apart Main Deflection CRT Video Boards and Rear Fence 24 10 Remove four screws two each bracket securing the left and right side brackets to the bezel Side Brac ket Sic Pew oi Take Apart Main Deflection CRT Video Boards and Rear Fence 25 11 Remove two screws securing the main bracket to the bezel thin Bracket Sc Pew Main Deflection CRT Video Boards and Rear Fence 26 lol Take Apart Protective Surface 12 Lift and tilt the video and main deflection board assembly away from the CRT Replacement Note Ensure P601 P701 P702 P703 P901 and P902 have cables installed before securing the side and bottom brackets to the bezel Replacement Caution Do not pinch any wires when positioning the side and bottom brackets into the bezel lt i gt o Take Apart Main Deflection CRT Video Boards and Rear Fence 27 13 Disconnect the two wire cable from P701 on the main deflection board 14 Disconnect the two wire cable from P601 on the main deflection o Take Apart Main Deflection CRT Video Boards and Rear Fence 28 15 Disconnect the two wire cable from P902 on the main deflection board and remove both cables
18. ake Apart Rear Fence Internal Video AC Inlet Assembly 46 1 Remove all wires from the nylon support on the right side bracket o Take Apart Rear Fence Internal Video AC Inlet Assembly 47 Note Steps 2 through 7 are for accessing P901 only 2 Remove two screws securing the right side bracket to the bezel 3 Remove one screw securing the right side of the main bracket to the bezel 4 Remove one screw securing the right side bracket to the bottom bracket Side Bracket Sc re ws Bottom Bracket Screw Main Bracket Sc ree o Take Apart Structures Rear Fence Internal Video AC Inlet Assembly 48 5 Gently lift the right side of the bottom bracket so the side bracket just clears the bezel support structures Bottom Bracket o Take Apart Rear Fence Internal Video AC Inlet Assembly 49 6 Slide the side bracket from the main bracket support and remove rai Take Apart Rear Fence Internal Video AC Inlet Assembly 50 7 Support the main deflection board with your hand Hold Deflection Board here 8 Disconnect the two wire cable from P901 on the main deflection board o Take Apart Rear Fence Internal Video AC Inlet Assembly 51 9 Remove the screw securing P704 cable to the rear fence o Take Apart Rear Fence Internal Video AC Inlet Assembly 52 10 Remove the screw securing the video board ground wire to the fence Ground Wire o
19. aution To prevent ESD damage to components wear a grounding wriststrap Never use a grounding wriststrap until after discharging the CRT quip o Take Apart Video Interconnect Cable 58 1 Remove two ground wires from the top of the video board Ground Wires o Take Apart Video Interconnect Cable 59 Warning Be sure the ey anode Wire a monitor has no power and I Connector EZAN the CRT has been properly discharged Serious injury could occur if the anode wire is removed while the CRT is charged 2 Remove the anode wire connector from the CRT o Take Apart Video Interconnect Cable 60 3 Remove four screws two each bracket securing the left and right side brackets to the bezel Side Brac ket Sic Pew oi Take Apart Video Interconnect Cable 61 4 Remove two screws securing the main bracket to the bezel thin Bracket Sc Pew lol Take Apart Video Interconnect Cable 62 Caution Care must be taken not to disturb the user brightness and contrast control knobs while lifting the video and main deflection board assembly 5 Lift and tilt the video and main deflection board assembly away from the CRT Protective Surface lt i gt ol Take Apart Video Interconnect Cable 63 6 Remove the cable from the nylon support Note Connector on P703 is hot glued 7 Disconnect the cable from P702 and P703 on the main deflection board to remove the cable
20. ck items 1 and 2 5 Replace the video and main deflection boards See Main Deflection CRT Video Boards and Rear Fence in Take Apart Adjust cutoff and white balance See Cutoff and White Balance in Adjustments No color Ensure that the setting for the number of colors in the Monitor Control panel is correct and not set to black amp white See the monitor user manual lt a gt fa Troubleshooting Symptom Charts Geometry 11 Geometry Raster is too short tall 1 Adjust the width and height of the screen See User narrow or wide Adjustments in Adjustments 2 Doublecheck the user controls 3 Replace video and main deflection boards See Main Deflection CRT Video Boards and Rear Fence in Take Apart Adjust cutoff and white balance See Cutoff and White Balance in Adjustments quip Troubleshooting Symptom Charts Geometry Continued 12 Geometry Continued Raster is not centered 1 Check that the distortion is not due to environmental conditions Move the monitor 2 Adjust the vertical and horizontal center of screen See User Adjustments in Adjustments 3 Adjust the raster center at VR701 See Raster Center Adjustment in Adjustments 4 Doublecheck items 1 through 3 5 Replace video and main deflection boards See Main Deflection CRT Video Boards and Rear Fence in Take Apart Adjust cutoff and white balance See Cutoff and White Balance in Adjustments lt a
21. e video and main deflection boards are removed from the bezel special care must be taken to avoid damaging the user brightness and contrast controls These knobs protrude about one inch past the main bracket and will not support the weight of the main deflection board and attached brackets The video board and the main deflection board cannot be separated without risk of damaging the CRT connector Therefore the video board and main deflection board are considered one module and will be replaced accordingly Connectors P302 P702 and P703 on the main deflection board and video board are difficult to remove Use a small flat blade screwdriver to gently pry back the tabs before removing these connectors ip Special Tools When adjusting the monitor check luminance readings using a color analyzer or photometer If such equipment is not available then use a 246 or an L 248 light meter Do not use other light meters The readings given in the Adjustments chapter are based on these meters The Apple high voltage probe Apple part number 076 0392 will also be needed Readings must be based on this probe and not on other high voltage probes available on the market Do not use other high voltage probes The Display Service Utility DSU in the Diagnostics Utilities folder on the Service Source Companion CD contains display patterns to help adjust the display Within the DSU select Pattern Selections Multiple Scan 720 1705 to access
22. emove two screws securing the EMI shield Sey to the rear fence EMI Shield Bin Brac ket lt i gt lol Take Apart EMI Shield 14 EFI Shield 6 Tilt the EMI shield so the shield tabs clear the slots in the rear fence and lift off Replacement Note If you need to remove the grounding brackets remove one at a time so the other grounding bracket can be referenced for proper installation of the tabs into the EMI shield Replacement Caution The grounding bracket tabs must be inserted correctly or the CRT will not be properly grounded resulting in equipment damage 40 Main Deflection CRT Video Boards and Rear Fence 15 Main Deflection CRT Video Boards and Rear Fence Before you begin e Remove Rear Housing e Remove EMI Shield e Discharge CRT Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury or equipment damage review the CRT safety and discharge instructions in Bulletins Safety Caution To prevent ESD damage to the components wear a grounding wriststrap Never use a grounding wriststrap until after discharging the CRT quip o Take Apart Main Deflection CRT Video Boards and Rear Fence 16 1 Set the monitor on the bottom bracket o Take Apart Main Deflection CRT Video Boards and Rear Fence 17 2 Disconnect two ground wires from the video board Ground Wires CT Take Apart Main Deflection C
23. ents 33 3 Attach the multimeter e Attach the negative probe to the chassis ground e Hold the positive probe to the lead on the striped side of the D709 cathode Adjust the voltage at VR501 HV until the multimeter reads 29 5 volts 0 1volt Non User Adjustments 34 Cutoff and White Balance Adjustments Before you begin Run the monitor for a minimum of 15 minutes Degauss CRT Screen Remove Rear Housing Remove EMI Shield Adjust High Voltage Note Cutoff and white balance adjustments must be performed whenever the video and main deflection boards are replaced Replacement modules need to be adjusted to the monitor s quip Non User Adjustments 35 CRT before color and brightness can be reproduced correctly quip Adjustments Brightness Contrast Non User Adjustments 36 Presets for Cutoff and White Balance Adjustments 1 Set the user controls to maximum brightness and contrast clock wise o Adjustments Non User Adjustments 37 2 Adjust VR305 SUB BRIGHT to its maximum position clockwise Adjustments Non User Adjustments 38 3 Adjust VR704 SUB CONTRAST to its center position o Adjustments Non User Adjustments 39 4 Adjust VR301 G DRIVE and VR302 R DRIVE to their center positions oi Adjustments Non User Adjustments 40 5 Adjust VR303 R BIAS and VR304 G BIAS to their minimum positions counter clockwise
24. er Adjustments 2 EE Controls switch A flip down door covers the i controls on the front of the monitor Gently push on the top center of the door to open or close it The power button is located to the right of the control panel and power LED Control Fower LED Panel Control Panel Cover Adjustments Contrast stments 3 Brightness Rotate the brightness control clockwise or counterclockwise to increase or decrease brightness Contrast Rotate the contrast control clockwise or counterclockwise to increase or decrease contrast Adjustments User Adjustments 4 Geometry Horizontal Center 1 Press and hold the SELECT button until the indicator light for the horizontal center icon goes on Press the DOWN and UP buttons to move the center of the picture left or right OC Adjustments User Adjustments 5 Width of Picture 1 Press and hold the SELECT button until the indicator light for the width icon goes on Press the DOWN and UP buttons to narrow or widen the picture Adjustments User Adjustments 6 Vertical Center 1 Press and hold the SELECT button until the indicator light for the vertical center icon goes on Press the DOWN and UP buttons to move the center of the picture down or up Adjustments User Adjustments 7 Height of Picture 1 Press the SELECT button until the indicator light for t
25. eter model L 248 e 0 9 foot lamberts on a photometer or color analyzer Y R305 Sub Bright Non User Adjustments 45 White Balance Adjustment Note Cutoff must be properly set before the white balance can be adjusted If the cutoff was not adjusted go to that procedure and adjust the cutoff now 1 Using Display Service Utility select the display pattern containing a small white box on a black field quip Adjustments Non User Adjustments 46 2 Adjust VR704 SUB CONTRAST until the display luminance measures e 26 on the bottom scale of light meter model R77 e Between between 26 and 27 on the lower scale of light meter model 246 e 11 onthe 10 18 scale of light meter model L 248 e 50 foot lamberts on a color analyzer or photometer quip o Adjustments Non User Adjustments 47 3 Select the all white display pattern 4 Adjust VR703 ABL until the luminance measures e 16 on the bottom scale of light meter model R77 e Between between 16 and 17 on the lower scale of light meter model 246 9 5 on the 2 10 scale of light meter model L 248 e 24 foot lamberts on a color analyzer or photometer Adjustments Non User Adjustments 48 5 Set the user brightness control to the middle position Brightness Contrast Adjustments Apple Multiple Scan 1705 Display Adjustment Points Use this drawing to locate the adjustment points on the main deflection and video b
26. from the CRT corner screws Bend the tabs to secure the degaussing coil in this position Adjusting the Degaussing Coils 4 3 Note Do not remove the board assemblies The illustration at left shows the boards removed for clarification only Check for tape or clips where the degaussing coils overlap near the deflection yoke 4 If the degaussing coils are not attached with tape or clips use two pieces of electrical tape about 6 inches long each to fasten the two coils closely together lt p lol Additional Procedures Adjusting the Degaussing Coils 5 5 At the bottom two corners of the CRT release the degaussing coil from the two bendable tabs quip Adjusting the Degaussing Coils 6 6 N Note Do not remove the board assemblies Pull the degaussing coil downward until the overlapped taped section where the degaussing coils meet is positioned 1 25 inches 30 mm from the bottom canceling coil Bend the two bottom tabs to secure the degaussing coil in this position Reassemble the monitor lt u gt Service Source Adjustments Apple Multiple Scan 1705 Display 407 User Adjustments 1 User Adjustments The image adjusted by the user is saved into the memory on the monitor CPU Central Processing Unit Therefore when the monitor is powered on again the image is displayed exactly the same as saved by the user quip o Adjustments Us
27. from the nylon support o Take Apart Main Deflection CRT Video Boards and Rear Fence 29 Caution Ground cables are supporting the weight of the video and main deflection board assembly Support this assembly with your hand when removing the ground cables 16 Remove the screws securing the two ground cables to the bottom bracket and remove the video and main deflection board assembly from the CRT and bezel rai Take Apart Main Deflection CRT Video Boards and Rear Fence 30 17 Remove the user brightness and contrast knobs from the controls on the main deflection board o Take Apart Main Deflection CRT Video Boards and Rear Fence 31 18 Remove the screw securing the right side bracket to the bottom bracket 19 Slide the bracket up to clear the main bracket support and remove 20 Remove the screw securing the left side bracket to the bottom bracket 21 Slide the bracket up to clear the main bracket support and remove Sit Pe Side Brac ket Bezel 32 Bezel Before you begin remove the following e Rear Housing e EMI Shield Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury or equipment damage review the CRT safety and discharge instructions in Bulletins Safety quip Bezel 33 lol Take Apart Sturdy Object Edge of Bezel Resting an Object Place a sturdy non abrasive object such as a large
28. gh voltage and a high vacuum picture tube To prevent serious injury or equipment damage review the CRT safety and discharge instructions in Bulletins Safety quip o Take Apart Rear Housing 8 CEPEEREREFE lle 1 Remove the power and 11 vail l sesa video cables from the itd i monitor i q i a Caution When the monitor is face down it is resting on the CRT screen The CRT must rest on a protective nonabrasive surface or the screen will become damaged o Take Apart Rear Housing 9 2 Place the monitor face down on a protective mat Protective Surface o Take Apart Rear Housing 10 3 Remove four screws securing the rear housing to the bezel 4 Lift the rear housing from the chassis Protective Surface EMI Shield 11 EMI Shield Before you begin remove the rear cover Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury or equipment damage review the CRT safety and discharge instructions in Bulletins Safety quip lo Take Apart EMI Shield 12 Remove two screws securing the ground wires to the left and right side brackets Remove two screws securing the ground wires and EMI shield to the left and right side brackets Carefully pull the EMI shield tabs away from the side brackets lol Take Apart EMI Shield 13 4 Remove two screws Screw securing the EMI shield to the main bracket En oe 5 R
29. he height icon goes on Press the DOWN and UP buttons to decrease or increase the height of the picture Adjustments User Adjustments 8 Picture Curvature 1 Press and hold the SELECT button until the indicator light for the picture curvature icon goes on Press the DOWN and UP buttons to change the arch of the picture border LJ Adjustments User Adjustments 9 Picture Side Alignment 1 Press and hold the SELECT button until the indicator light for the side alignment icon goes on Press the DOWN and UP buttons to change the alignment Adjustments User Adjustments 10 Degauss Press the DEGAUSS button to degauss the monitor Adjustments User Adjustments 11 Factory Settings Note Picture controls are generally fine tuned by the user To revert to the factory settings press the DOWN and UP buttons at the same time Non User Adjustments 12 Non User Adjustments Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury or equipment damage review the CRT safety and discharge instructions in Safety Information under the DO menu Warning Use a plastic screwdriver to make all adjustments to the controls located on the video and main deflection boards Caution To prevent ESD damage to components wear a grounding wriststrap Never use a grounding wriststrap until after discharging the CRT Important
30. idity Power Saving Feature Environmental Operating 50 F to 104 F 10 C to 40 C Shipping 4 F to 151 F 40 C to 65 C Storage 32 F to 140 F 0 C to 60 C Operating O ft to 10 000 ft 0 m to 3 000 m Shipping O ft to 35 000 ft 0 m to 10 606 m Operating 20 to 95 noncondensing Shipping 5 to 95 noncondensing Storage 5 to 95 noncondensing This monitor conforms to the Energy Star program of the United States Environmental Protection Agency The power saving feature is compatible with the Display Power Management Standard DPMS of the Video Electronics Standards Association VESA lt u gt Service Source Troubleshooting Apple Multiple Scan 1705 Display lt a gt lol Troubleshooting General 1 General In this chapter you will find Symptom Charts designed to help you diagnose and repair the Multiple Scan 1705 Display Go through the Symptom Charts until you find the right symptom Because cures are listed in the order of the most likely solution begin with the first listed cure Verify whether or not the product continues to exhibit the symptom If the symptom persists try the next cure If you require additional assistance contact Apple Technical Support lt a gt fa Troubleshooting First Checklist 2 First Checklist Important Many Apple Multiple Scan Display modules returned for repair are found to be fully operational Read this checklist before you re
31. ng and adjusting high voltage Helpful drawing At the end of this chapter there is a simplifed wiring diagram that shows all of the connector locations and names You may want to print it out 407 o Take Apart 7 LEER GL Lie LLLELLELCLLe ii 11179 ddddddddddd ggg I LLI ii Monitor Stand 2 Monitor Stand No first steps required 1 Remove the video and power cables from the back of the monitor Caution When the monitor is face down it is resting on the CRT screen The CRT must rest on a protective nonabrasive surface or the screen will become damaged o Take Apart Monitor Stand 3 2 Place the monitor face down on a protective mat Protective Surface o Take Apart Monitor Stand 4 Depress the tab on the rear of the housing just behind the monitor stand Monitor Stand 5 4 Slide the monitor stand a toward the back of the monitor and remove o Take Apart Control Panel Cover 6 Control Panel Cover No first steps required Caution Grasp the cover as close to the hinge as possible or the cover may break 1 a hi P ln 1 Open the control panel ry i yah 7 A ay i i cover a 2 Grasp the cover at one side and pull so slot disengages bezel 3 Repeat this procedure for the other side of the Control Panel panel Cover Rear Housing 7 Rear Housing First No first steps required Warning This product contains hi
32. ning This product contains high voltage and a high vacuum picture tube To prevent serious injury or equipment damage review the CRT safety and discharge instructions in Bulletins Safety Before you begin remove the following e Rear Housing e EMI Shield e Bezel quip o Take Apart On Off Switch with Spring 42 Note The switch is spring loaded and will fly when pushed from the bezel 1 Pinch two retainers on the on off switch together and push from the back of the bezel Power Switch lol Take Apart Control Panel Cover Latch 43 Control Panel Cover Latch Before you begin remove the following e Rear Housing e EMI Shield e Bezel 1 Prop the bottom edge of the bezel up about two inches 2 Open the control panel cover lt i gt Take Apart Control Panel Cover Latch 44 3 With an object about one half inch in diameter and three inches long drive the latch from the inside of the bezel Control Panel Replacement Note The latch can be installed when the monitor is fully assembled Rear Fence Internal Video AC Inlet Assembly 45 Rear Fence Internal Video AC Inlet Assembly Before you begin remove the following e Rear Housing e EMI Shield Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury or equipment damage review the CRT safety and discharge instructions in Bulletins Safety quip o T
33. oards VR702 VR201 SW 802 Sws01 Contrast Bright Up Recall Select aes 664 phy pihy 7 a SW 804 SW 803 Degaussing Down Recall Sw901 Power Switch i VR704 Subcontrast 7 VR703 ABL Focus 4 Screen VR701 Fly Back ll H Raster Transformer Center re VR501 VR301 Highvoltage G Drive O Adjustment vR302 1 _VR303 R Drive Crem R Bias a LA VR304 G Bias OH vrsos 5 Sub Bright 10 Service Source Exploded View Apple Multiple Scan 1705 Display lt u gt Exploded View 1 922 1840 Housing Rear 922 1841 Monitor Stand f 8 Tilt Swivel 922 1842 Bezel Monitor with ates Power and a ear Adj B djustment Buttons _ l E ake and AC Inlet 922 2021 Cable Video Interconnect 922 1847 922 1846 Latch Control Switch On Off Panel Cover with Spring 922 1843 Cover 922 1845 Control Panel Knobs Contrast and Brightness 922 1878 Power Cord 110V 661 1070 Boards Main Deflection CRT Video Rear Fence 922 1877 Cable Video External 922 1458 z Adapter Mac to VGA
34. raphics Array or greater capability A video card may need to be installed to use this monitor with some computers For more information see the computer manual Any computer equipped with a Boogie Board will support 24 bit color 1705 CPU Compatibility List Standard With Additional Video Source Configuration Memory PowerMacintosh 9500 24 bit 16 7 million 24 bit 16 7 mil colors lion colors Power Macintosh 8500 24 bit 16 7 million 24 bit 16 7 mil colors lion colors quip Characteristics 4 Standard With Additional Video Source Configuration Memory Power Macintosh 7500 24 bit 16 7 million 24 bit 16 7 mil Power Macintosh 7200 colors lion colors Power Macintosh 6200 16 bit 32K colors 24 bit 16 7 mil lion colors Powe Macintosh 8100 16 bit 32K colors 24 bit 16 7 mil lion colors Power Macintosh 7100 8 bit 256 colors 16 bit 32K colors Power Macintosh 6100 none no memory upgrade Power Macintosh with 16 bit 32K colors no memory AV upgrade Quadra 610 650 700 800 4 bit 16 colors 8 bit 256 colors lt gt Characteristics 5 Video Source Quardra 660AV Quadra 840Av 900 950 Standard Configuration 8 bit 256 colors 8 bit 256 colors With Additional Memory no memory upgrade 16 bit 32 colors Centris 610 650 4 bit 16 colors 8 bit 256 colors Macintosh Display Card 24AC 2
35. rming the adjustment procedures you might determine if one or more of the adjustments is the cause of the problem T CRTs rarely fail Needless CRT replacement can be prevented by checking display adjustments checking the possibility of other defective modules and accepting small imperfections in screen display If you have any doubts about whether a CRT is defective contact Apple Technical Support lt a gt fa Troubleshooting No raster with LED on Symptom Charts No Raster 5 Symptom Charts No Raster 1 Check monitor cable connections Thumbscrews must be tightened securely If a video card is used the monitor cable must be secured to the card Adjust brightness and contrast controls see User Adjustments in Adjustments A screen saver may be activated Move mouse or press any key to reactivate the screen The Energy Saver option may be on Move mouse or press any key on the keyboard to reactivate the display The display reactivates in about 20 seconds Some Macintosh computers may not wake up after Energy Saver is activated Restart computer and disable Energy Saver Go to Check High Voltage quip fa Troubleshooting Symptom Charts No Raster Continued 6 No Raster Continued No raster with LED off 1 Ensure that power cord is plugged in properly 2 Check power outlet at the wall by plugging in an electronic device that works 3 If the display is plugged into a computer ensure tha
36. rts 1 5 to 2 inches tall on the protective surface about one foot apart 10 Carefully lift the CRT 11 and video and main deflection board assembly from the bezel Set the CRT on the protective surface and the video and main deflection board assembly on the supports Bezel 39 Replacement Note Carefully line up the brightness and contrast controls into the bezel when installing The controls will bind on the bezel tabs and not operate if not carefully aligned Replacement Note Position a sturdy nonabrasive object inside the bezel Carefully place the CRT and video and main deflection board assembly on the sturdy object Lift the bezel and line up the screw holes and brightness and contrast knobs with the CRT and video and deflection board assembly Slide the monitor until the lower edge of the bezel is supported by the object This will hold the bezel in place while the screws are installed 407 lol Take Apart Brightness and Contrast Knobs 40 Kno bs Brightness and Contrast Knobs Warning This product contains high voltage and a high vacuum picture tube To prevent serious injury or equipment damage review the CRT safety and discharge instructions in Bulletins Safety Before you begin remove the following e Rear Housing e EMI Shield e Bezel Slide the brightness and contrast knobs from their controls lt qu gt On Off Switch with Spring 41 On Off Switch with Spring War
37. t computer is on and power cord firmly connected 4 Check video cable connections at computer and monitor Thumbscrews must be secure If a video card is used the video cable must be properly connected to it 5 Replace video and main deflection boards See Main Deflection CRT Video Boards and Rear Fence in Take Apart Adjust cutoff and white balance See Cutoff and White Balance in Adjustments 6 Send the monitor to Apple for repair quip Troubleshooting Symptom Charts No Raster Continued 7 No Raster Continued No raster with LED 1 Check video cable connections at computer and monitor yellow Thumbscrews must be secure If a video card is used the video cable must be properly connected to it 2 See Do You Need a Video Card in monitor user manual lt a gt fa Troubleshooting Screen flickers Symptom Charts Video 8 Video Check the monitor cable connections The thumbscrews must be tightened securely If a video card is used the monitor cable must be secured to the card Check for external interference by moving the monitor to another location If using more than one monitor with a computer move the monitors so they are least 18 inches apart If a video card is used check the refresh rate Refresh rates below 60 Hz may cause flicker See the video card manual to raise the refresh rate above 60 Hz Doublecheck items 1 through 4 Replace the video and main deflection boards See Main
38. the screen patterns used for this monitor Refer to Non User Adjustments in the Adjustments chapter lt u gt Service Source Specifications Apple Multiple Scan 1705 Display lt u gt ia Specifications Characteristics 1 Picture Tube Screen Resolution Characteristics Size Active Video Display area 17 inches FST 15 8 inch diagonal viewable image size Gun In line Neck Diameter 1 164 inches 29 1mm Phosphor P22 Dot Pitch 0 28 mm 720x400 at 70 Hz in VGA mode 640x480 at 60 Hz in VGA mode 1024x768 at 70 Hz in 1024x768 mode 640x480 at 70 Hz inVESA mode 800x600 at 72 Hz in SVGAII mode 1280x1024 at 84 Hz in 1280x1024 mode 1280x1024 at 60 Hz in UVA11 mode lt gt ia Specifications Characteristics 2 Scan Rates Vertical refresh rate 47 120 Hz Horizontal scan rate 31 65 kHz In addition to the above scan rates this display works at the following VESA Video Electronics Standards Association standard modes See the manual that came with the computer or video card to determine which resolutions are supported 640x480 at 60 Hz in VGA mode 640x480 at 75 Hz in VGA mode 800x600 at 60 Hz in SVGA mode 800x600 at 75 Hz in SVGA moce Cable Connector 15 pin miniature D type Input Signals Red green blue signals separate sync lt gt E Specifications Characteristics 3 System Compatibility This display works with most IBM PC compatible computers equipped with VGA Video G
39. turn a module and prevent needless module replacement and unnecessary time delays The Apple Multiple Scan 1705 Display is not compatible with all computers This display works with most IBM PC compatible computers equipped with VGA Video Graphics Array or greater capability A video card may need to be installed to use this display with some computers For more information see the computer manual The display is preadjusted to work with any computer that has the following timing ranges e Horizontal scan rate of 31 65 kilohertz quip First Checklist 3 fa Troubleshooting e Vertical refresh rate of 47 120 hertz For more information on what computers or video cards are compatible with the 1705 display see the Specifications chapter The CRT raster will not always resemble a perfect rectangle CRT tolerances allow for some distortion Additional distortion can be caused by magnetized metal objects desks file cabinets etc Move the unit to a different location if you notice raster bowing or bent raster edges Jitter faint lines or screen movement can be caused by external interference such as electronic devices and fluorescent lights Move the unit to another room or building to help determine if external interference is the source of the problem lt i gt lol Troubleshooting First Checklist 4 A maladjusted screen can mimic the symptoms of deflection board or CRT failures By perfo
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