Apple Multiple Scan 20 Display Specifications

Service Source K Apple Multiple Scan 15 AVDisplay

Specifications Characteristics - 5 Monitor Timings 640x480 Resolution @ 60 Hz640x480 Resolution @ 67 HzHorizontal Timing Horizontal TimingBack Porch

Adjustments Geometry - 15 Pincushion 1 Simultaneously press the Select and Recall buttons so that the two leftmost indicator lights turn on.2 Press

Adjustments Geometry - 16 Keystone 1 Simultaneously press the Select and Recall buttons so that the two leftmost indicator lights turn on.2 Press th

Adjustments Geometry - 17 Recalling Factory Settings Important: The monitor controls are set at the factory. To fine-tune and adjust the picture,

Adjustments Focus Adjustment - 18 Focus Adjustment Before you begin, refer to the Take Apart chapter to remove the rear housing. ± Warning: This p

Adjustments Focus Adjustment - 19 ± Warning: Because you make adjustments from the rear of the monitor, position a mirror to view the monitor scre

Adjustments Focus Adjustment - 20 4 Set the brightness and contrast controls to maximum (turn fully clockwise).BrightnessContrast

Adjustments Focus Adjustment - 21 5 Use a plastic screwdriver to adjust the Focus control on the flyback transformer for best center screen focus.Fo

Adjustments Focus Adjustment - 22 6 Reset the brightness control to its detent (middle) position.Brightness

Adjustments Horizontal Centering - 23 Horizontal Centering Before you begin, refer to the Take Apart chapter to remove the rear housing. ± Warning:

Adjustments Horizontal Centering - 24 monitor screen. Do not reach around the monitor to adjust the controls. Note: Perform the horizontal centeri

Specifications Characteristics - 6 Monitor Timings 800x600 Resolution @ 60 Hz800x600 Resolution @ 72 HzHorizontal Timing Horizontal TimingBack Porch

Adjustments Horizontal Centering - 25 2 Set both brightness and contrast controls to maximum (turn fully clockwise).BrightnessContrast

Adjustments Horizontal Centering - 26 3 Use a plastic screwdriver to position the arm of the horizontal center switch (SW701) until the raster is ce

Adjustments Horizontal Centering - 27 4 Reset the brightness control to its detent (middle) position.Brightness

Adjustments Cutoff and White Balance - 28 Cutoff and White Balance Before you begin, refer to the Take Apart chapter to remove the rear housing. ± W

Adjustments Cutoff and White Balance - 29 monitor screen. Do not reach around the monitor to adjust the controls. Caution: When adjusting the cont

Adjustments Cutoff and White Balance - 30 1 Turn on the display and let it warm up for at least 10 minutes.2 Using the control strip, set the displa

Adjustments Cutoff and White Balance - 31 4 Preset both brightness and contrast controls to maximum (turn fully clockwise).BrightnessContrast

Adjustments Cutoff and White Balance - 32 5 Use a plastic screwdriver to preset the Sub-Brightness control (VR306) to its maximum setting (countercl

Adjustments Cutoff and White Balance - 33 6 Preset the following controls to their center positions.• Sub-Contrast control (VR303)• R Drive control

Adjustments Cutoff and White Balance - 34 8 Using the Display Service Utility, select the gray bars display pattern.9 With the room lights dimmed, u

Specifications Characteristics - 7 Monitor Timings 832x624 Resolution @ 75 Hz1024x768 Resolution @ 75 HzHorizontal Timing Horizontal Timing1/H: 49.7

Adjustments Cutoff and White Balance - 35 10 Use a plastic screwdriver to adjust the G Bias (VR305) cutoff control until the screen has a bluish-gre

Adjustments Cutoff and White Balance - 36 become neutral gray:• If the display looks too red, turn up the G Bias or turn down the R Bias• If the dis

Adjustments Cutoff and White Balance - 37 13 The drive controls normally will not require an adjustment. However, if a predominant color remains in

Adjustments Cutoff and White Balance - 38 14 If required, perform a slight readjustment of the G Bias and R Bias cutoff controls to maintain neutral

Adjustments Cutoff and White Balance - 39 15 If the previous two steps caused more than the leftmost bar to become completely black, perform a sligh

Adjustments Cutoff and White Balance - 40 16 Using the Display Service Utility, select the Apple MultiScan 1705 selection screen, and then select th

Adjustments Light Meter Setup (Model 246) - 41 Light Meter Setup (Model 246) Before you begin,• Remove the metal slide (if installed) from the top o

Adjustments Light Meter Setup (Model 246) - 42 2 Place the lens against the middle of the screen and read the scale.

Service Source K Exploded View Apple Multiple Scan 15AVDisplay

Exploded View 1Rear Housing922-2244Speaker Grille Gaskets922-2240Bezel922-2432CRT/Video Board922-2317Sound-Out Cable922-1781Control Panel Board922-

Specifications Controls and Ports - 8 Controls and Ports User Controls Front Panel: power, select, up, down, recall, brightness, contrast, sound vo

Specifications Physical and Electrical - 9 Physical and Electrical Power Supply Voltage: 100–240 VACFrequency: 50–60 HzPower: 75 W maximum; 8 W slee

Specifications Environmental - 10 Environmental Temperature Operating: 50°F to 104°F (10°C to 40°C)Shipping: –4°F to +151°F (–40°C to +65°C)Storage:

Service Source K Troubleshooting Apple Multiple Scan 15AVDisplay

Troubleshooting General - 1 General The Symptom Charts included in this chapter will help you diagnose specific symptoms related to your product. Be

Troubleshooting First Checklist/ - 2 First Checklist Important: Many Apple Multiple Scan 15AV display modules returned for repair are found to be

Troubleshooting First Checklist - 3 A maladjusted screen can mimic the symptoms of main deflection board or CRT failures. By performing the adjustme

Service Source K Basics Apple Multiple Scan 15AVDisplay

Troubleshooting Symptom Charts/No Raster - 4 Symptom Charts No Raster No raster (screen is black); power indicator light on1 Ensure that the display

Troubleshooting Symptom Charts/Video (Continued) - 5 Video (Continued) Areas of the screen have blotches of color 1 Since this type of problem (p

Troubleshooting Symptom Charts/Geometry - 6 Geometry Raster not centered 1 Adjust either or both horizontal center and vertical center controls. See

Troubleshooting Symptom Charts/Sound Problems - 7 Sound Problems Distorted or no sound coming through one speakerDisconnect the wires to both speake

Service Source K Take Apart Apple Multiple Scan 15AVDisplay

Take Apart Safety Guidelines for Taking Apart the Apple Multiple Scan 15AV Safety Guidelines for Taking Apart the Apple Multiple Scan 15AV Display

Take Apart Control Panel Door - 2 Control Panel Door No preliminary steps are required before you begin this procedure.Control Panel Door

Take Apart Control Panel Door - 3 1 Position the monitor close to the edge of a table and so that the screen faces you.2 Press down on the center of

Take Apart Control Panel Door - 4 3 Grasp each side of the door and pull the door down to release it from its hinges. Replacement Note: Position t

Take Apart Tilt-Swivel Stand - 5 Tilt-Swivel Stand Before you begin, remove the control panel door. Note: Because this procedure requires you to p

Basics Overview - 1 Overview The Apple Multiple Scan 15AV Display is a 15-inch (13.75-inch viewable image size) color monitor that supports a variet

Take Apart Tilt-Swivel Stand - 6 1 Place the monitor face-down on a padded surface with the bottom of the stand facing you.2 Press inward on both ta

Take Apart Tilt-Swivel Stand - 7 3 Tilt the stand upward and off the bottom housing. Replacement Note: With the monitor face down, insert the two

Take Apart Rear Housing - 8 Rear Housing Before you begin, remove • Control panel door• Tilt-swivel stand ± Warning: This product contains high vo

Take Apart Rear Housing - 9 1 Place the monitor face-down on a padded surface.2 Remove the four Phillips screws (two on each side).Screws

Take Apart Rear Housing - 10 3 Lift the rear housing straight off the CRT assembly and route the video cable through the opening in the rear housing

Take Apart Speaker - 11 Speaker Before you begin, • Remove the control panel door• Remove the tilt-swivel stand• Remove the rear housing• Discharge

Take Apart Speaker - 12 1 Locate the inoperative speaker and disconnect the speaker connector near the display’s bottom corner, either• Red speaker

Take Apart Speaker - 13 2 Remove the speaker wire from its routing channel.RoutingChannelSpeaker Wire

Take Apart Speaker - 14 3 Use a flat-blade screwdriver to pry off the speaker and its foam gasket from the bezel.4 Lift the speaker from the inside

Take Apart Speaker Grilles - 15 Speaker Grilles Before you begin, • Remove the control panel door• Remove the tilt-swivel stand• Remove the rear ho

Basics Overview - 2 Monitor Features Features of the Apple Multiple Scan 15AV Display include the following:• Antistatic, antiglare screen surface•

Take Apart Speaker Grilles - 16 1 Remove the two recessed screws at the top and bottom of the inner bezel sides. Caution: Do not remove the CRT c

Take Apart Speaker Grilles - 17 2 Insert a small flat-blade screwdriver between the outside speaker grille and bezel. Pry off the grille in four pla

Take Apart Speaker Grilles - 18 3 Gently tilt the speaker grille toward the display face to release it from the bezel hooks.4 Repeat steps 1 through

Take Apart Sound In Board - 19 Sound In Board Before you begin, • Remove the control panel door• Remove the tilt-swivel stand• Remove the rear housi

Take Apart Sound In Board - 20 1 Remove • Two screws • P156 connector2 Lift the board off the metal bracket.ScrewP156Screw Sound InBoard

Take Apart CRT/Video Board - 21 CRT/Video Board Before you begin, • Remove the control panel door• Remove the tilt-swivel stand• Remove the rear hou

Take Apart CRT/Video Board - 22 Caution: When disconnecting cables from the CRT/video board, be careful not to apply excessive pressure on the nec

Take Apart CRT/Video Board - 23 2 From the side of the CRT assembly, disconnect• Two-wire connector behind CRT/video board• Braided cable at E2 to t

Take Apart CRT/Video Board - 24 3 From the back of the CRT assembly, remove • Phillips screw that connects the braided cable to the sound in board•

Take Apart CRT/Video Board - 25 4 From the side of the CRT assembly, disconnect• Red wire with the gray connector on the CRT/video board at P304• Bl

Service Source K Specifications Apple Multiple Scan 15AVDisplay

Take Apart CRT/Video Board - 26 5 Caution: Twisting, bending, or applying force to the CRT/video board could damage the neck of the CRT.With a gen

Take Apart CRT/Video Board - 27 7 Using a Phillips screwdriver, remove the screw holding the braided cable to the back panel flange.8 Disconnect• Co

Take Apart CRT/Video Board - 28 9 Use a flat-blade jeweler’s screwdriver to gently pry up the wire lock (about one to two millimeters) from the CRT

Take Apart CRT/Video Board - 29 10 Using needlenose pliers, firmly grasp the lock and twist it in a clockwise direction (about one-eighth of a turn)

Take Apart CRT/Video Board - 30 11 Pull the wire lock and wire from the CRT socket.Because the lock fits loosely over the wire, slightly bend the wi

Take Apart CRT/Video Board - 31 Replacement Note: Before returning a CRT/video board for replacement, remove and retain the shield so you can atta

Take Apart Video Cable - 32 Video Cable Before you begin, • Remove the control panel door• Remove the tilt-swivel stand• Remove the rear housing• Di

Take Apart Video Cable - 33 Caution: Twisting, bending, or applying force to the CRT/video board could damage the neck of the CRT.1 Disconnect • T

Take Apart Video Cable - 34 3 With some wires still attached, move the CRT/video board so that you can reach the back panel screws.4 Remove• Phillip

Take Apart Video Cable - 35 5 Disconnect• Connector P301• Pin E3 P301 E3

Specifications Characteristics - 1 Characteristics Picture Tube 15-in. CRT (13.75-in. diagonal viewable image size)Raster Size: 10.6 in. x 7.9 in. (

Take Apart Video Cable - 36 6 Disconnect P401 from the center of the main deflection board.7 Cut the tie wrap that holds the P401 cable. 8 Remove th

Take Apart Video Cable - 37 9 At the video cable strain relief, press the two hooks forward and pull up on the video cable strain relief to release

Take Apart Main Deflection Board - 38 Main Deflection Board Before you begin, • Remove the control panel door• Remove the tilt-swivel stand• Remove

Take Apart Main Deflection Board - 39±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review

Take Apart Main Deflection Board - 402 Disconnect • Speaker connector • Ground pin SpeakerConnectorGround Pin

Take Apart Main Deflection Board - 413 Disconnect the CRT yoke wire at P701.P701

Take Apart Main Deflection Board - 424 Disconnect • Speaker connector• Degaussing coil at P902SpeakerConnectorP902

Take Apart Main Deflection Board - 435 Place the monitor face-down on a padded surface.6 Remove the two Phillips screws from the bottom housing.Screw

Take Apart Main Deflection Board - 447 While grasping the end of the main deflection board chassis with one hand, use a flat-blade screwdriver to pre

Take Apart Main Deflection Board - 45are attached to the main deflection board chassis.Replacement Note: With the control panel board secured to the

Specifications Characteristics - 2 Screen Resolution Macintosh 640x480 at 60 Hz in VGA mode640x480 at 67 Hz in Macintosh mode800x600 at 60 Hz in SVG

Take Apart Control Panel Board - 46Control Panel BoardBefore you begin, • Remove the control panel door• Remove the tilt-swivel stand• Remove the rea

Take Apart Control Panel Board - 47To prevent serious injury, review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning o

Take Apart Control Panel Board - 482 Slightly tilt the control panel board forward, and slide it out of the plastic holder.Holder

Take Apart Control Panel Board - 493 Disconnect the following four connectors: • P152• P153• P154• P155Replacement Note: Remove and retain the three

Take Apart Power Switch - 50Power SwitchBefore you begin, • Remove the control panel door• Remove the tilt-swivel stand• Remove the rear housing• Dis

Take Apart Power Switch - 51review CRT safety in Bulletins/Safety and read the safety guidelines at the beginning of this chapter.1 Place the monitor

Take Apart Power Switch - 522 Locate the power switch lock inside the bezel.LockBezel

Take Apart Power Switch - 533 Use needlenose pliers to grasp the lower tab of the power switch lock. Pull up the lock as far as it will go.Tab Lock

Take Apart Power Switch - 544 While holding the lock tab up, use a second pair of needlenose pliers to pinch the two side tabs so that they fit throu

Take Apart Power Switch - 555 Pull the lock off of the power switch and spring.Power LockSpringSwitch

Specifications Characteristics - 3 Cable Connector 15-pin miniature D-type Input Signals Red, green, and blue signals; separate sync Audio Response:

Take Apart Power Switch - 566 Tilt up the CRT assembly to pull out the power switch and spring from the front side of the bezel.The power switch asse

Take Apart Front Bezel - 57Front BezelBefore you begin, • Remove the control panel door• Remove the tilt-swivel stand• Remove the rear housing• Disch

Take Apart Front Bezel - 58±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety

Take Apart Front Bezel - 592 Using a Phillips screwdriver, remove the four CRT corner screws and washers (two on each side).ScrewScrew

Take Apart Front Bezel - 603 Using both hands, lift the CRT off of the front bezel.Front BezelCRT

Service Source K Adjustments Apple Multiple Scan 15AVDisplay

Adjustments Power Supply Voltage - 1 Power Supply Voltage Before you begin, refer to the Take Apart chapter to remove the rear housing. ± Warning:

Adjustments Power Supply Voltage - 2 1 Turn on the display and let it warm up for five minutes.2 Using the control strip, set the screen resolution

Adjustments Power Supply Voltage - 3 4 Locate jumper wire J5 on the left side of the main deflection board.J5

Adjustments Power Supply Voltage - 4 5 Connect the positive probe (red wire) of a digital voltmeter to jumper J5 and connect the ground probe (black

Specifications Characteristics - 4 System Requirements Power Macintosh, Macintosh Centris, Macintosh Quadra, some Macintosh Performas, or any NuBus

Adjustments Power Supply Voltage - 5 6 While maintaining the voltmeter probe connections, use a plastic screwdriver to adjust VR951 until the voltme

Adjustments High Voltage - 6 High Voltage Before you begin, refer to the Take Apart chapter to remove the rear housing. ± Warning: This product co

Adjustments High Voltage - 7 1 Turn on the display and let it warm up for five minutes.2 Using the control strip, set the screen resolution to 640x4

Adjustments High Voltage - 8 4 Locate diode D713 between the flyback transformer and large heatsink on the main deflection board.Notice the cathode

Adjustments High Voltage - 9 5 Connect the positive probe (red wire) of a digital voltmeter to the cathode (striped end) of D713.6 Connect the groun

Adjustments Geometry - 10 Geometry Before you begin, open the control panel door. Note: In most cases, the preset factory settings require no adju

Adjustments Geometry - 11 Vertical Center 1 Press the Select button until the vertical center indicator light turns on.2 Press the up button or down

Adjustments Geometry - 12 Horizontal Center 1 Press the Select button until the horizontal center indicator light turns on.2 Press the up button or

Adjustments Geometry - 13 Vertical Size 1 Press the Select button until the vertical size indicator light turns on.2 Press the up button or down but

Adjustments Geometry - 14 Horizontal Size 1 Press the Select button until the horizontal size indicator light turns on.2 Press the up button or down