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Apple Technical ProceduresApple Macintosh Portrait Display“Series B”Section 2 – Take-Aparto CONTENTS2.2 Rear Cover2.4 Electromagnetic Interference (EMI) Shield2.7 Discharging the Cathode-Ray Tube (CRT)2.8 Discharge Procedure2.9 Anode Cap2.10 Contrast Brightness Board2.13 Dynamic Focus Board2.16 On/Off Switch Assembly2.19 Fuse2.20 AC Input/Filter Assembly2.23 Video Board2.34 Main Deflection Board2.41 Cathode-Ray Tube (CRT)2.43 LED Cable Assembly2.45 Bezel Note If a step is underlined, detailed instructions for that step can be found elsewhere in the section.o REAR COVER Note The following Take-Apart procedures are for the “Series B” (European) version of the Macintosh Portrait Display only. To differentiate between monitors, check the product name at the top of the manufacturer’s label on the rear cover.WARNING The Macintosh Portrait Display “Series B” contains high voltage and a high-vacuum picture tube. To prevent serious personal injury and property damage, be sure you read and understand the safety precautions in Section 8, CRT Safety, under the You Oughta Know tab before you remove the back cover. Failure to follow the safety rules could result in serious injury.Materials Required Medium Phillips screwdriver Remove 1. Switch off the monitor and disconnect the AC power cord and video cable.2. Place the monitor face down on a soft, protective surface to avoid damaging the CRT screen.FIGURE 13. Remove the four case screws (Figure 1) from the rear cover.4. Lift the rear cover off the bezel and set it aside.Replace 1. Carefully set the monitor face down on a soft, protective surface.2. Slide the rear cover onto the bezel, and replace the four case screws (Figure 1).3. Carefully set the monitor upright.o ELECTROMAGNETIC INTERFERENCE (EMI) SHIELD The EMI shield consists of two metal panels secured to the top and bottom of the monitor chassis. Only the top panel must be removed to discharge the Portrait Display monitor and access most of its replaceable modules and parts. The bottom panel must be removed if you are replacing the video board, main deflection board, CRT assembly, LED cable assembly, or bezel. Most monitor adjustments can be performed without removing the EMI shield.Materials Required Small Phillips screwdriverRemove 1. Remove the rear cover.2. Place the monitor upright on the protective pad.FIGURE 23. Remove the six screws that secure the top panel of the EMI shield to the chassis (Figure 2). Pull the top panel off the chassis.4. Discharge the cathode-ray tube (CRT). Note Perform steps 5 and 6 for removing the bottom panel of the EMI shield only if you are replacing the video board, main deflection board, CRT assembly, LED cable assembly, or the bezel.5. Carefully place the monitor on its side, with the bottom of the monitor facing you.FIGURE 36. Remove the six screws that secure the bottom panel of the EMI shield to the chassis (Figure 3). Pull the bottom panel off the chassis.Replace Note Perform steps 1 and 2 only if you have removed the bottom panel of the EMI shield.1. Carefully place the monitor on its side on a soft, protective surface, with the bottom of the monitor facing you.2. Push the notched end of the bottom panel under the two chassis tabs as shown in Figure 3. Then align the holes in the bottom panel and the chassis, and install the six mounting screws.3. Place the monitor upright on the protective pad.FIGURE 44. Push the notched end of the top panel under two chassis tabs as shown in Figure 4. Align the holes in the top panel and chassis, and install the six mounting screws.5. Replace the rear cover.o DISCHARGING THE CATHODE-RAY TUBE (CRT)The Macintosh Portrait Display is equipped with a bleeder resistor that automatically drains the charge from the CRT when the power is shut off. Follow the discharge procedure below to ensure your safety in the event that the resistor has failed and the anode is still fully charged.Materials Required Safety gogglesFoam pad (ungrounded)Needlenose pliersAlligator leadNew CRT discharge tool (part number 076-0381)WARNING Before starting, read the safety precautions and the CRT discharge procedure in Section 8, CRT Safety, under the You Oughta Know tab. Alternative instructions for discharging the CRT using the older version of the discharge tool (and/or a screwdriver) are given in that section.WARNING To prevent serious injury, before discharging the CRT never touch the yoke wires, the anode wire, the anode connector, the three high-voltage resistors on the dynamic focus board, or flyback transformer (Figure 5).FIGURE 5Discharge 1. Remove your grounding wriststrap and jewelry and Procedure put on safety goggles before beginning! 2. Remove the rear cover and the top panel of the EMI shield.3. Set the monitor upright on the ungrounded foam pad, with the back facing you.FIGURE 64. Attach the clip of the CRT discharge tool to any metal part of the chassis (Figure 6).5. Put one hand behind your back, and grasp the handle of the discharge tool with your other hand.WARNING Use only one hand when discharging the CRT to prevent forming a path of current through your body should your hand slip and touch the metal part of the discharge tool during the discharge procedure.6. Hold the CRT discharge tool to the tube surface, and insert its probe under the anode cap (Figure 6) until it touches the anode ring. 7. Remove the probe of the CRT discharge tool from under the anode cap and detach its clip from the metal chassis.Note If the bleeder resistor fails, a secondary charge could build up over time, even after you have discharged the CRT. To dissipate any residual charge, establish an ongoing ground by clipping one end of an alligator lead to the chassis frame and the other end to the anode aperture.Anode Cap For some procedures, you may have to remove the anode cap (Figure 7). After you have discharged the CRT, peel back the anode cap until you can see the anode "ring" (or connector) at the center. Using needlenose pliers, compress the two prongs on the connector to free it from the anode aperture.To replace the anode cap, press together the two prongs of the anode connector so that you can insert it into the aperture. Tug on the anode wire to make sure it is firmly seated, and then press down around the edges of the rubber anode cap to ensure a firm seal.FIGURE 7o CONTRAST BRIGHTNESS BOARDMaterials Required Small Phillips screwdriver Medium flat-tip screwdriver Small adjustable wrenchRemove 1. Remove the rear cover and top panel of the EMI shield.2. Discharge the CRT. 3. Place the monitor upright on a grounded workbench pad and put on your grounding wriststrap. (Never put on the grounding wriststrap until after you have discharged the CRT.)4. Disconnect the following connectors from the contrast brightness board (Figure 8) • 2-wire, 3-pin connector • 4-wire connector FIGURE 85. Pull off the two plastic control knobs (Figure 9). Keep the knobs to install them on the replacement board.6. Using an adjustable wrench, loosen and remove the two hex nuts from the two adjustment knobs, and remove the contrast brightness board (Figure 9). FIGURE 9Replace 1. Replace the contrast brightness board (Figure 9) on the chassis, and install the two hex nuts. Tighten the nuts with an adjustable wrench. 2. Replace the two control knobs (Figure 9).3. Reconnect the following connectors to the contrast brightness board (Figure 10). • 4-wire connector • 2-wire, 3-pin connector FIGURE 104. Replace the top panel of the EMI shield.5. Replace the rear cover.o DYNAMIC FOCUS BOARDRemove 1. Remove the rear cover and the top panel of the EMI shield, and discharge the CRT. 2. Place the monitor upright on a grounded workbench pad and put on your grounding wriststrap (put on the wriststrap only after discharging the CRT). WARNING When removing connectors from the dynamic focus board, be careful not to touch resistors R517, R518, or R520 (Figure 11). These are high-voltage resistors.3. Disconnect the following connectors from the dynamic focus board (Figure 11)• Single-wire connector (labelled CO on the dynamic focus board) • 2-wire, 4-pin connector (labelled CP) • 2-wire connector (labelled CQ) • 6-wire connector (labelled CI) Note To disconnect connector CQ you must first depress its two plastic release tabs.FIGURE 114. Pull up on two plastic mounting tabs (Figure 12) to release the dynamic focus board from the chassis. Carefully lift out the board.FIGURE 12Replace 1. Place the dynamic focus board onto the two chassis mounting brackets (Figure 12). Be sure the two notches along the bottom of the board are placed between channel locks on the mounting brackets.2. Align the two plastic mounting tabs with the mounting holes in the top of the board (Figure 12). Pull back on the top of the board until it snaps securely onto the mounting tabs.FIGURE 133. Reconnect the following connectors to the dynamic focus board (Figure 13)• 6-wire connector to CI • 2-wire connector to CQ (push until its two plastic release tabs lock in place)• 2-wire, 4-pin connector to CP • Single-wire connector to CO 4. Replace the top panel of the EMI shield.5. Replace the rear cover.o ON/OFF SWITCH ASSEMBLYMaterials Required Small Phillips screwdriver Medium flat-blade screwdriverRemove 1. Remove the rear cover and the top panel of the EMI shield, and discharge the CRT.2. Place the monitor upright on a grounded workbench pad and put on your grounding wriststrap (put on the wriststrap only after discharging the CRT). 3. Pull the plastic knob off the on/off switch (Figure 14).FIGURE 14WARNING The neck of the CRT can be easily damaged. Be careful not to apply excessive pressure on the video board when removing the on/off switch connector.4. Disconnect the 2-wire, on/off switch connector (Figure 14) from the connector labelled CA on the main deflection board. (Suggestion To remove the on/off switch connector, insert your right hand around and beneath the video board as shown in Figure 14, and insert your left hand between the video board and the rear of the chassis. Be sure to release the tabs on the sides of the connector.)5. Disconnect the power input connector (Figure 15) from the connector on the on/off switch board.FIGURE 15 6. Remove two mounting screws (Figure 15), and remove the on/off switch from inside the chassis.Replace 1. Replace the on/off switch on the chassis mounting bracket, and install the two mounting screws (Figure 16).FIGURE 16 2. Connect the power input connector (Figure 16) to the connector on the on/off switch board. 3. Connect the 2-wire, on/off switch connector (Figure 16) to the connector labelled CA on the main deflection board. 4. Replace the plastic knob (Figure 16) on the on/off switch.5. Replace the top panel of the EMI shield and the rear cover.o FUSEMaterials Required Small flat-blade screwdriverRemove 1. Remove the rear cover and the top panel of the EMI shield, and discharge the CRT. 2. Place the monitor upright on a grounded workbench pad and put on your grounding wriststrap (put on the wriststrap only after discharging the CRT).3. Remove the fuse from the on/off switch board (Figure 17). Gently pry up one end of the fuse with your fingers or a flat-blade screwdriver, and lift the fuse out of the holder.FIGURE 17Replace 1. Using your fingers, carefully snap the new fuse into the fuse holder (Figure 17).2. Replace the top panel of the EMI shield, and replace the rear cover.o AC INPUT/FILTER ASSEMBLYMaterials Required Medium Phillips screwdriverRemove 1. Remove the rear cover and the top panel of the EMI shield, and discharge the CRT. 2. Place the monitor upright on a grounded workbench pad and put on your grounding wriststrap (put on the wriststrap only after discharging the CRT). 3. Remove the on/off switch assembly.FIGURE 184. Remove the screw, lock washer, and AC input/filter ground wire from the ground bracket (Figure 18). FIGURE 195. Remove the two mounting screws, and carefully remove the AC input/filter assembly through the mounting hole in the chassis (Figure 19). To remove the input/filter assembly, turn it left (clockwise) as you pull it through the mounting hole.Replace 1. Install the new AC input/filter assembly on the chassis mounting bracket with two screws (Figure 19). To install the input/filter assembly, first insert the cables and filter board through the chassis mounting hole, and then turn the assembly to the right (counterclockwise) to insert the AC inlet.2. Install the AC input/filter ground wire on the chassis ground bracket with a lock washer and a screw (Figure 18).3. Replace the on/off switch assembly.4. Replace the top panel of the EMI shield.5. Replace the rear cover.o VIDEO BOARD Materials Required Medium Phillips screwdriver Small needlenose pliers Soldering iron and solder Plastic tie-wrapRemove 1. Remove the rear cover, and remove the top and bottom panels of the EMI shield.2. Discharge the CRT, and remove the anode cap.3. Place the monitor upright on a grounded workbench pad and put on your grounding wriststrap (put on the wriststrap only after discharging the CRT).4. Remove the screw, lock washer, and large black video ground cable from the ground bracket (Figure 20).FIGURE 205. Disconnect the 4-wire connector from the contrast brightness board (Figure 21). Open the two tie wraps to the left of the neck of the CRT.FIGURE 216. Disconnect the following connectors from the dynamic focus board (Figure 21) • 2-wire, 4-pin connector (labelled CP) • 2-wire connector (labelled CQ) Note To disconnect connector CQ you must first depress its two plastic release tabs.7. Disconnect the following connectors from the video board (Figure 22) • Video connector • 7-wire connector FIGURE 228. Carefully place the monitor face down on the protective workbench pad.FIGURE 23 CAUTION When separating the chassis from the bezel, keep in mind that the LED cable and the 4-wire yoke cable are still connected between the chassis and bezel.9. Separate the chassis and bezel. To do this, refer to Figure 23 and follow these substeps a) Loosen (but do not remove) the four chassis mounting screws. b) With the monitor facedown, slide the chassis toward its bottom until the openings in the chassis flanges are aligned with the four screwheads (Figure 23A). c) Carefully lift the chassis off the mounting screws and rest it, right side up, on the edge of the bezel as shown in Figure 23B. With your right hand, hold the chassis on the bezel. d) With your left hand, disconnect the following connectors from the main deflection board • LED cable (labelled CN) • 4-wire yoke cable (labelled CH) e) Set the chassis aside on the protective pad. Note Stop here if you are performing this procedure only to access the main deflection board, the LED assembly, or the bezel.(Graphic not available)FIGURE 2410. Disconnect the small black ground cable from the chassis. To do this, pull on the cable and grasp the braided (Aquadag) ground strap with the needlenose pliers. While using the pliers to pull the Aquadag strap away from the CRT with one hand, unhook the ground cable with your other hand (Figure 24A).WARNING Twisting, bending, or applying force to the video board could damage the neck of the CRT. Hold the video board squarely on the neck of the CRT with one hand while loosening the ring clamp screw with the other.11. Loosen the screw on the plastic ring clamp that secures the video board to the neck of the CRT (Figure 24B).12. Remove the video board from the neck of the CRT (Figure 24C). To do this, grab the metal cover with both hands and carefully pull the video board straight back off the CRT.Replace 1. Install the new video board on the neck of the CRT (Figure 24C). To do this, first check that none of the CRT pins is bent; straighten bent pins with a needlenose pliers. Then align the video board connector with the plastic alignment nipple on the neck of the CRT, and firmly push the video board connector onto the neck of the CRT. WARNING Forcing the video board onto the CRT could damage the neck of the CRT. If the video board does not slide easily onto the CRT, slightly adjust the alignment between the video board and the CRT pins and try again. Also do not overtighten the screw on the ring clamp.2. Tighten the screw (Figure 24B) on the ring clamp just enough to keep the video board from slipping. 3. Reconnect the small black video ground cable to the Aquadag ground strap on the CRT (Figure 24A). To do this, first bend open the inner tongue of the metal connector at the end of the video ground cable. Then insert the tip of the jeweler’s screwdriver between the braided Aquadag ground strap and the body of the CRT. While prying the Aquadag strap away from the CRT, slip the metal connector on the end of the video ground cable over the Aquadag strap. Bend the tongue back to secure the connector to the Aquadag strap.FIGURE 254. Replace the chassis on the bezel. To do this, refer to Figure 25 and follow these substeps a) Place the chassis right side up on the edge of the bezel as shown in Figure 25A. Hold the chassis with your right hand. b) With your left hand, connect the the following connectors to the main deflection board • 4-wire yoke cable (to the connector labelled CH on the main deflection board) • LED cable (to connector CN) c) Tuck all loose cables inside the chassis. d) Carefully place the chassis on the bezel. Slip the four holes in the chassis flange over the four chassis mounting screws, and lock the chassis under the mounting screws as shown in Figure 25B. e) Tighten the four chassis mounting screws.5. Carefully place the monitor upright on the protective workbench pad.(Graphic not available)FIGURE 266. Reconnect the following connectors to the video board (Figure 26A) • 7-wire connector • Video connector 7. Reconnect the following connectors to the dynamic focus board (Figure 26B) • 2-wire, 4-pin connector (labelled CP) • 2-wire connector (labelled CQ)8. Reconnect the 4-wire connector to the contrast brightness board (Figure 26B). Rebundle the loose video cables with the two tie wraps.9. Reconnect the large, black video ground cable to the chassis ground terminal with the lock washer and screw (Figure 26C).10. Replace the bottom and top panels of the EMI shield.11. Replace the rear cover.o MAIN DEFLECTION BOARDMaterials Required Small Phillips screwdriver Medium Phillips screwdriver 3/8-inch nut driver Small flat-blade screwdriverRemove 1. Remove the rear cover, and the top and bottom panels of the EMI shield.2. Discharge the CRT and remove the anode cap. 3. Place the monitor upright on a grounded workbench pad, and put on your grounding wriststrap. (Never put on the grounding wriststrap until after you have discharged the CRT.)4. Separate the chassis from the bezel. Refer to the video board Remove procedure.5. Disconnect the on/off switch connector from the connector labelled CA on the main deflection board (Figure 27).FIGURE 27FIGURE 286. Disconnect the following connectors from the dynamic focus board (Figure 28) • Single-wire connector (labelled CO) • 6-wire connector (labelled CI) 7. Disconnect the 3-pin, 2-wire connector from the contrast brightness board (Figure 28).(Graphic not available)FIGURE 298. Remove the screw that secures the flyback transformer to the chassis (Figure 29A). 9. Using the 3/16-inch nut driver, remove the two screws that secure the video connector to the chassis (Figure 29A).10. Remove two screws and lock washers that secure the main deflection board to the chassis (Figure 29B).11. Using a flat-blade screwdriver, pry open the two metal tabs and pull the main deflection board out of the chassis (Figure 29C).Replace 1. Replace the main deflection board on the chassis (Figure 29C). To do this, fit the board between the channel tabs lining both sides of the chassis. Then push the board forward until the video connector extends through the front of the chassis and the two metal tabs snap onto the chassis.2. Replace the two screws and lock washers that secure the main deflection board to the chassis (Figure 29B).3. Using the 3/16-inch nut driver, replace the two mounting screws that secure the video connector to the chassis (Figure 29A).4. Replace the screw that secures the flyback transformer to the chassis (Figure 29A).5. Connect the 3-pin, 2-wire connector to the contrast brightness board (Figure 30).FIGURE 306. Connect the following connectors to the dynamic focus board (Figure 30) • 6-wire connector (to the connector labelled CI) • Single-wire connector (labelled CO)7. Connect the on/off switch cable to the connector labelled CA on the main deflection board (Figure 31).FIGURE 318. Replace the chassis. Refer to the video board Replace procedure.9. Replace the anode cap.10. Replace the bottom and top panels of the EMI shield.11. Replace the rear cover.FIGURE 32o CATHODE-RAY TUBE (CRT)Materials Required Medium Phillips screwdriver (magnetic)Remove 1. Remove the rear cover and the top and bottom panel of the EMI shield.2. Discharge the CRT and remove the anode cap. 3. Place the monitor upright on a grounded workbench pad, and put on your grounding wriststrap (put on the wriststrap only after discharging the CRT).4. Remove the video board.5. Remove the four chassis mounting screws (Figure 32A).6. Remove the four CRT mounting screws, metal ground tabs, and spacers from the corners of the bezel (Figure 32A).CAUTION The neck of the CRT is easily damaged. Do not grab the neck of the CRT to remove it from the bezel. If necessary, have a helper hold down the bezel while you grab the CRT by its edges and remove it.7. Lift the CRT out of the bezel. Remove the four CRT mounting ears from the flanged corners of the CRT (Figure 32B). WARNING If you intend to dispose of the CRT, refer to "Disposing of the Cathode-Ray Tube" in Section 8, CRT Safety, under the You Oughta Know tab.Replace 1. Place the four CRT mounting ears on the corner flanges of the CRT, and carefully place the CRT inside the bezel as shown in Figure 32B. The anode aperture in the CRT should be on the opposite end of the cutaway in the bezel.2. Install the four spacers, metal grounding tabs, and chassis mounting screws on the corners of the CRT (Figure 32A). Tighten the chassis mounting screws to 1/4 inch above the grounding tabs.3. Align the mounting ears, flanges, spacers, and tabs with the mounting holes in the bezel, and replace the four CRT mounting screws (Figure 32A). Make sure the CRT is positioned in the approximate center of the bezel before tightening the CRT mounting screws.4. Replace the video board.5. Replace the anode cap, and the bottom and top panels of the EMI shield.6. Replace the rear cover.o LED CABLE ASSEMBLYMaterials Required Small Phillips screwdriver Remove 1. Remove the rear cover and the top and bottom panel of the EMI shield.2. Discharge the CRT and remove the anode cap. 3. Place the monitor upright on a grounded workbench pad, and put on your grounding wriststrap. (Never put on the grounding wriststrap until after you have discharged the CRT.)4. Remove the video board.5. Remove the CRT.6. Remove the mounting screw, and slide the LED cable assembly out of the bezel (Figure 33).FIGURE 33Replace 1. Slide the LED cable assembly onto the bezel as shown in Figure 33, and replace the mounting screw.2. Replace the CRT and the main deflection board.3. Replace the video board.4. Replace the anode cap.5. Replace the bottom and top panels of the EMI shield, and the rear cover.o BEZELRemove 1. Remove the rear cover. 2. Replace the top and bottom panels of the EMI shield.3. Discharge the CRT and remove the anode cap. 4. Place the monitor upright on a grounded workbench pad, and put on your grounding wriststrap. (Never put on the grounding wriststrap until after you have discharged the CRT.)5. Separate the chassis from the bezel. Refer to the video board Remove procedure.6. Remove the CRT.7. Remove the LED cable assembly.Replace 1. Replace the LED cable assembly.2. Replace the CRT.3. Replace chassis. Refer to the video board Replace procedure.4. Replace the anode cap.5. Replace the bottom and top panels of the EMI shield.6. Replace the rear cover. Apple Technical ProceduresApple Macintosh Portrait Display“Series B”Section 3 – Adjustmentso CONTENTS3.2 Introduction3.3 Safety Instructions3.4 Live Adjustment Rules3.5 Location of Controls3.5 User Controls3.5 External Service Controls3.6 Internal Service Controls3.8 Test Patterns3.8 MacTest II/IIx Materials Required3.8 Generating Test Patterns Using MacTest II/IIx3.11 MacTest IIcx/IIci Materials Required3.11 Generating Test Patterns Using MacTest IIcx/IIci3.13 Adjustment Procedures3.13 Materials Required3.13 Vertical Adjustments3.15 Horizontal Adjustments3.18 Focus3.19 Video Adjustmentso INTRODUCTIONWhenever you replace a module within the Apple Macintosh Portrait Display “Series B,” some adjustment of the video display may be necessary. As a general rule, replacing the main deflection board may require making geometric (vertical/horizontal) or focus adjustments, whereas replacing the CRT or video board requires performing the video adjustments. IMPORTANT Do not attempt any tilt or ring adjustments on the yoke of the Macintosh Portrait Display. All such yoke adjustments have been set by the manufacturer.Use the following procedures to perform horizontal, vertical, focus, and video adjustments. If these procedures do not correct the monitor's adjustment problems, isolate the faulty module (see Section 4, Troubleshooting) and return the module to Apple.o SAFETY INSTRUCTIONSWARNING The Macintosh Portrait Display contains a high-vacuum picture tube and operates at very high voltages. To prevent serious injury, before working inside this monitor, read and learn all safety precautions in Section 8, CRT Safety, under the You Oughta Know tab.In addition to the safety precautions outlined in CRT Safety under the You Oughta Know tab, be sure to• Use only insulated alignment tools whenever performing live video adjustments on the monitor.• Keep one hand behind your back at all times, and grasp the handle of the insulated alignment tool with your other hand.• Use a mirror for viewing adjustment results. Never attempt to make live adjustments while facing the screen and reaching around to the back of the monitor to rotate the controls—you cannot see what you are about to touch!• Perform only those adjustments that are absolutely necessary. Do not attempt to make any adjustments other than the ones explained in this section, and do those with extreme caution.WARNING Serious injury could result if, with the power on, you touch any of the components shown in Figure 1.Live In addition to the precautions listed on the previousAdjustment page, never touch the following components whenRules adjusting a live Macintosh Portrait Display (Figure 1).• Any part of the yoke assembly, including the yoke wires• The anode wire • The anode connector• The flyback transformer• The inside of the AC power switch • The high-voltage resistors (R517, R518, R520) on the dynamic focus boardFIGURE 1o LOCATION OF CONTROLSUser The brightness and contrast controls are located Controls on the side of the monitor's case and are accessible to the user (Figure 2). FIGURE 2External The following service adjustment controls are located Service on the main deflection board, but can be accessed by Controls removing a plastic panel found on the rear cover (Figure 2).• Height, or vertical amplitude (V.AMP; RV5)• Vertical center (V.SHIFT; RV4)• Horizontal center (H.PHASE; RV7)Internal The internal service adjustment controls are located on Service the video board, the dynamic focus board, and the main Controls deflection board. These controls can be accessed only after removing the rear cover.Video board (Figure 3)• VIDEO GAIN Dynamic focus board (Figure 3)• FOCUS (RV502)• DYNAMIC FOCUS (RV501) (Graphic not available)FIGURE 3FIGURE 4 Note Internal service controls located on the main deflection board are accessed through the bottom panel of the EMI shield.Main deflection board (Figure 4)• V.LIN (RV3)• H.AMP (B5))• H.LIN (B6))• SUB.BRIGHT (RV9)o TEST PATTERNSProcedures for using the MacTest diagnostic program to display test patterns on a Portrait Display differ, depending upon whether the monitor is connected to a Macintosh II/IIx or to a Macintosh IIcx/IIci. Use the version of MacTest that is appropriate for your test station.MacTest II/IIx Macintosh II or Macintosh IIxMaterials Required Macintosh II Portrait Video Card or Macintosh Display Card MacTest™II/IIx diagnostic disk (version 3.1 or higher) IMPORTANT The Macintosh II Portrait Video Card RAM must be upgraded to 512K in order to display the MacTest (II/IIx or IIcx/IIci) test patterns. Refer to the Macintosh Family Cards Technical Procedures.Generating Test MacTest II/IIx tests the video RAM on the Macintosh II Patterns Using Portrait Video Card and displays test patterns used to MacTest II/IIx adjust the monitor. Follow the steps below to display the MacTest II/IIx test patterns1. Connect the monitor's video cable and power cord to the Macintosh II or Macintosh IIx computer. 2. Boot the MacTest II/IIx disk. For computers with more than one drive, boot MacTest from Drive 1, the right-side drive.3. MacTest II/IIx will display a window instructing you to turn off the system and connect a SCSI loopback card. Unless you wish to test the logic board, click OK to get to the Start window.4. When the Start window appears on the screen, go to the menu and open the Control Panel.5. Click the Monitors icon.6. In the area called Characteristics of selected monitor, select Black & White/Grays. In the area called Grays, select the number 16.7. If more than one monitor is connected to the computer, make sure the Macintosh Portrait Display is the main monitor. (Test patterns can be displayed on the main monitor only.) Check the box at the bottom of the panel—the monitor icon with a menu bar is the main monitor. If necessary, drag the menu bar to the icon representing the Portrait Display.8. Close the Control Panel to return to the Start window. Note If you selected a new main monitor, you must restart MacTest II/IIx in order for this change to take effect. After closing the Control Panel, quit MacTest II/IIx and then reboot MacTest II/IIx.9. Select Test Selections from the Options menu (or type T). When the Test Selections window appears, deselect the default Logic and Disk Drives tests by clicking their selection boxes once.10. To test video RAM on the video card, click Video Card in slot. Apple recommends testing the video card before performing the video adjustments.11. Click Video monitor to display the video adjustment test patterns, and click OK to close the Test Selections window.12. When the Start window reappears, click Start. Note If you selected the video card RAM test, this message appears Testing Macintosh Video Card. Horizontal and vertical lines flash across the screen. After about one minute the Start window reappears, and the Status line indicates whether the video card passed the test. 13. An alert box informs you that test patterns can be displayed only on the default monitor. Click OK to display the first test pattern. Note Click the mouse to advance to the test pattern you want. Each test pattern is displayed once. When you have advanced through the test patterns, you will be returned to the Start window. Clicking Start reruns the video RAM test (if selected), and/or redisplays the test patterns. (To display the test patterns without rerunning the video RAM test, deselect Video Card in slot in the Test Selections window.)14. MacTest II/IIx displays the test patterns listed below and shown in Figure 5.• Gray Bars• Full Black Screen• Full White Screen• Crosshatch I (black background)• Crosshatch II (white background)• Focus(Graphic not available)FIGURE 5MacTest IIcx/IIci Macintosh IIcx or Macintosh IIciMaterials Required Macintosh II Portrait Video Card or Macintosh Display Card (not required for Macintosh IIci)MacTest™ IIcx/IIci diagnostic disk (version 2.0 or higher)IMPORTANT The Macintosh II Portrait Video Card RAM must be upgraded to 512K in order to display the MacTest IIcx/IIci test patterns. Refer to the Macintosh Family Cards Technical Procedures.Generating Test MacTest IIcx/IIci tests the video RAM on video cards Patterns Using installed in Macintosh IIcx or IIci computers and MacTest IIcx/IIci displays test patterns used to adjust the monitor. Follow the steps below to test the video RAM or display the test patterns.1. Connect the monitor's video cable and power cord to the Macintosh IIcx or Macintosh IIci computer. 2. Boot the MacTest IIcx/IIci disk. 3. Select Test Selections from the Options menu (or type T). When the Test Selections window appears, deselect all default test selections. Note Apple recommends testing the video RAM before performing the video adjustments. To test video RAM on board a Macintosh IIci computer, you must run the Short or Long RAM logic test.4. To test the video RAM on an installed video card, click Video Card in Slot and enter the appropriate slot number. 5. To display the video adjustment test patterns• Click Video Monitor Connected to Built-in Video, or• Click Video Monitor Connected to Selected Card. (Be sure that the correct video card slot is entered in the Video Card in Slot box.)6. Click OK to close the Test Selections window and return to the Start window. Note If built-in video is being used to generate the monitor test patterns, the memory allocation for the built-in video must be set to at least 16 grays/colors. From the Apple menu, open the Control Panel, click Monitors, click the highest number of Grays/Colors, and close the Control Panel.7. From the Start window, click Start to proceed. You will encounter one or both of these scenarios • If you chose to test the Portrait Video Card, the following message appears on the main (boot) monitor Testing Macintosh II Portrait Video Card. Horizontal and vertical lines flash across the screen of the Portrait Display. After about one minute, the Status line in the Start window on the main monitor indicates whether the video card passed the test. Clicking Start again displays the first test pattern (if selected) or reruns the video card test. • If you chose to display only the monitor test patterns, the first (gray bars) test pattern is displayed on the Portrait Display screen. Click the mouse to advance through the test patterns (each test pattern is displayed once). When you have advanced through the test patterns, you are returned to the Start window. Clicking Start reruns the video RAM test (if selected), and/or redisplays the test patterns. (To display the test patterns without rerunning the video RAM test, deselect Video Card in Slot in the Test Selections window.)8. MacTest IIcx/IIci displays the test patterns listed below• Gray Bars• Full White Screen• Full Black Screen• Crosshatch I (black background)• Crosshatch II (white background)• Focuso ADJUSTMENT PROCEDURESThe vertical size, vertical center, and horizontal center adjustments can be performed using the external service controls only. All other service adjustments are performed with the rear cover removed. WARNING Always use an insulated screwdriver when performing live video adjustments. For the following procedures, also make sure the insulated screwdriver has a plastic tip.Materials Required Plastic adjustment tool (insulated plastic screwdriver) Plastic hex alignment tool Voltmeter Light meter (Sekonic Multi-Lumi, model L-248) Mirror and flexible metric rulerVertical The vertical size and vertical center adjustments use Adjustments the Full White Screen test pattern; the vertical linearity adjustment uses a Crosshatch test pattern. To display these patterns, see "Test Patterns."Adjusting 1. Display the Full White Screen test pattern on the Vertical Size monitor (see "Test Patterns").2. Using the insulated plastic screwdriver, turn the height, or vertical amplitude (V.AMP) control (Figure 6) until the raster is 276 mm high.Note To measure the raster height, place a flexible metric ruler against the screen and align the zero mark of the ruler over the top edge of the raster. keeping your eye perpendicular to the zero mark. Without moving the ruler, shift your head until the same eye is perpendicular to the bottom of the raster, and note the ruler measurement. FIGURE 6Adjusting 1. Display the Full White Screen test pattern on the Vertical Center monitor (see "Test Patterns").2. Using the insulated plastic screwdriver, turn the vertical center (V.SHIFT) control (Figure 7) until the raster is centered (top to bottom) in the display area.3. Verify that the raster is 276 mm high. If it is not, perform the vertical size adjustment and (if necessary) repeat the vertical center adjustment.FIGURE 7Adjusting Vertical 1. Turn off power to the test station and to the Linearity monitor, and disconnect all cables from the monitor.2. Remove the rear cover.3. Reconnect the power and video cables to the monitor, and turn on monitor and system power.4. Display either Crosshatch test pattern on the monitor (see "Test Patterns").5. Place the monitor on its side, with the bottom facing you. Use the mirror to view the screen display.6. Using the insulated plastic screwdriver, turn the vertical linearity (V.LIN) control (Figure 8) until the boxes at the top of the display are the same size as those at the bottom. (With the monitor on its side, keep in mind that the top and bottom of the display are on your left and right.)7. Recheck and (if necessary) repeat the vertical center and vertical size adjustments.FIGURE 8Horizontal The horizontal adjustments use the Full White Screen Adjustments test pattern. To display this pattern, see "Test Patterns."Adjusting 1. Turn off power to the test station and to the Horizontal Size monitor, and disconnect all cables from the monitor.2. Remove the rear cover.3. Reconnect the power and video cables to the monitor, and turn on monitor and system power.4. Using the insulated plastic screwdriver, turn the horizontal size (H.AMP) control (Figure 8) until the raster is 203 mm wide. Note On some monitors you may need to remove the bottom panel of the EMI shield to adjust the H.AMP control (see the Take-Apart procedure). If the H.AMP control is too difficult to adjust using a plastic tool, try using the Apple alignment tool with metal tip (P/N 949-0223).Note To measure the raster width, place a flexible metric ruler against the screen and align the zero mark of the ruler exactly over the left edge of the raster, keeping your eye perpendicular to the zero mark. Without moving the ruler, shift your head until the same eye is perpendicular to the right edge of the raster, and note the ruler measurement. Adjust the H.AMP control as necessary.FIGURE 9Adjusting 1. Using the insulated plastic screwdriver, turn the Horizontal Center horizontal center (H.PHASE) control (Figure 9) until the raster is centered (left to right) in the display area. 2. Verify that the raster is 203 mm wide. If it is not, perform the horizontal size adjustment and repeat (if necessary) the horizontal center adjustment.Adjusting Horizontal 1. Turn off power to the test station and to the Linearity monitor, and disconnect all cables from the monitor.2. Remove the rear cover.3. Reconnect the power and video cables to the monitor, and turn on monitor and system power.4. Display either Crosshatch test pattern on the monitor (see "Test Patterns").5. Place the monitor on its side, with the bottom facing you. Use the mirror to view the screen display.FIGURE 106. Using the hex alignment tool, turn the horizontal linearity (H.LIN) control (Figure 10) until the boxes at the left of the display are the same size as those at the right. (With the monitor on its side, keep in mind that the left and right sides of the display are on the top and bottom.)7. Recheck and (if necessary) repeat the horizontal center and horizontal size adjustments.Focus 1. Turn off power to the test station and to the monitor, and disconnect all cables from the monitor.2. Remove the rear cover.3. Reconnect the power and video cables to the monitor, and turn on monitor and system power.4. Display the Focus test pattern on the monitor (see "Test Patterns").5. Set the brightness control (Figure 11) to midrange—the detent position. To identify the detent position, turn the knob and locate the place in the middle where the knob hesitates.6. Set the contrast control (Figure 11) at maximum (full clockwise).(Graphic not available)FIGURE 11 Note On some monitors you may need to remove the top panel of the EMI shield to adjust the focus control. Refer to the Take-Apart procedure.WARNING To prevent serious injury, do not touch the three high-voltage resistors on the dynamic focus board. These resistors are labelled R517, R518, and R520.7. Using the insulated plastic screwdriver, successively adjust the following focus controls (Figure 11)a) Turn the focus control to attain the best possible overall focus.b) Turn the dynamic focus control to attain the best possible focus along the left and right edges of the display.c) Repeat substeps a and b until you have attained the best focus possible.Video The video adjustments should be performed whenever Adjustments the CRT or video board has been replaced. 1. Turn off power to the test station and to the monitor, and disconnect all cables from the monitor.2. Remove the rear cover.3. Reconnect the power and video cables to the monitor, and turn on monitor and system power.4. Display the Gray Bars test pattern on the monitor (see "Test Patterns").5. Set the brightness control (Figure 11) to midrange—the detent position. To identify the detent position, turn the knob and locate the place in the middle where the knob hesitates.6. Set the contrast control (Figure 11) at maximum (full clockwise).FIGURE 127. Place the monitor on its side, with the bottom facing you. Use the mirror to view the screen display.8. Using the insulated plastic screwdriver, turn the SUB.BRIGHT control (Figure 12) until the first bar (on bottom) is completely black, and the second bar is barely visible. The first bar should match the black border that extends 1/8 inch around the screen.9. Place the monitor upright, and display the Full White Screen test pattern on the monitor (see "Test Patterns").10. Make sure the brightness control is still set at its detent position and the contrast control is at maximum (full clockwise).(Graphic not available)FIGURE 1311. Measure screen luminance with the light meter. The light meter should read at the low end of the 11 scale (40 ft.-lamberts) (see Figure 14). If screen luminance is too high or low, use the insulated screwdriver to turn the video gain control (Figure 13) until you obtain a correct reading at the light meter. (See "Using the Light Meter to Measure Screen Luminance" later in this section for more information.)12. Set the brightness control at maximum (full clockwise), and recheck screen luminance with the light meter. The light meter should not measure beyond the 11 scale (above 60 ft.-lamberts) (see Figure 14).If screen luminance measures out of the 11 scale (over 60 ft.-lamberts) on the light meter, repeat the video adjustments procedure.(Graphic not available)FIGURE 14Using the Light Meter Use the light meter to measure the screen luminance of to Measure the Portrait Display as followsScreen Luminance 1. Verify that the light meter is functioning correctly by pressing the red button on the back of the meter. If the reading moves to the right of the red notch, replace the battery.2. Move the side switch up so that the lower scale reads 10 through 18 (Figure 14).3. Move the lens hood aside to uncover the lens of the meter. Place the lens against the screen exactly at screen center, press the "read" button, and obtain the light meter reading on the lower scale (Figure 14). Apple Technical ProceduresApple Macintosh Portrait Display "Series B"Illustrated Parts Listo CONTENTSIPL.3 Macintosh Portrait Display "Series B"—System Exploded View (Figure 1)IPL.5 Cables (Figure 2)The figures and lists in this section include all piece parts that can be purchased separately from Apple for the Apple Macintosh Portrait Display "Series B", along with their part numbers. These are the only parts available from Apple. Refer to your Apple Service Programs manual for prices.(Graphic not available)FIGURE 1o MACINTOSH PORTRAIT DISPLAY "SERIES B"—SYSTEM EXPLODED VIEW (Figure 1) Item Part No. Description 1 949-0245 Plastic Rear Cover 2 661-1603 Dynamic Focus Board, VDE-B version 3 661-0580 Main Deflection Board, VDE-B version 4 590-0610 LED Cable Assembly 5 076-0331 CRT Assembly, VDE-B version 076-0391 CRT Assembly, VDE-B version, Antistatic 6 949-0244 Plastic Case Bezel 7 076-0322 CRT Mounting Kit 8 661-0539 Video Board 9 982-0028 Contrast Brightness Board 10 915-0043 AC Inlet/Filter Assembly, 110/240 V 11 937-0043 On/Off Switch Assembly 12 941-0018 Fuse, 1.25A, 250 V (5/pk) A 956-0020 Screw/Knob Set The Screw/Knob Set consists of the items listed below. Items are not available for purchase separately, but are identified as A in Figure 1. On/Off Switch Button (1) Brightness/Contrast Knob (1) Service Panel Door (1) Rubber Foot (4) Pan-Head Screws (32) Hex Screws (4) Star Washers (4) Flat-Head Screws (1)FIGURE 2o CABLES (Figure 2) Item Part No. Description 1 590-0421 Power Cable, 1.9 m 2 590-4501 Cable, ADB, 1.9 m 3 590-0574 Video Cable, DB25 to DB25 590-0615 Video Cable, DB15 to DB25 @ ˇ ˇˇˇˇ @