K Service Source Macintosh TV
K Service Source Basics Macintosh TV
Basics Overview - 1 Overview This manual contains complete repair procedures for the Macintosh TV shown at left.
K Service Source Specifications Macintosh TV
Specifications Processor - 1 Processor CPU Motorola 68030 microprocessor 32 MHz Built-in memory management unit (MMU) Coprocessor Socket for optional math coprocessor
Specifications Memory - 2 Memory RAM 4 MB of dynamic RAM on board Expandable to 8 MB (100 ns or faster SIMMs) 72-pin DRAM SIMM connector ROM 1 MB of ROM, expandable to 2 MB PRAM 256 bytes of clock/calendar/parameter memory Long-life lithium battery VRAM 512K of VRAM on board (displays up to 256 colors or 8-bit color)
Specifications Disk Storage - 3 Disk Storage Floppy Drive Internal 1.4 MB Apple SuperDrive Hard Drive 3.
Specifications I/O Interfaces - 4 I/O Interfaces Serial Two RS-232/RS-422 serial ports; mini DIN-8 connectors SCSI One SCSI parallel port; DB-25 connector Connects up to six external SCSI devices Apple Desktop Bus Two Apple Desktop Bus (ADB) ports; mini DIN-4 connectors Maximum of three ADB devices recommended Maximum current draw: 500 mA (Mouse draws 10 mA, keyboard draws 25 mA)
Specifications Infrared Receiver Sound I/O Interfaces - 5 For remote control Sound-output port capable of delivering stereo sound Sound-input port for monaural sound input Front headphone jack capable of delivering stereo sound
Specifications I/O Devices - 6 I/O Devices Keyboard Supports all Apple Desktop Bus keyboards Mouse Apple Desktop Bus Mouse II New, ergonomic design Speaker Adjustable sound control on front of bezel
Specifications Sound and Video - 7 Sound and Video Sound Generator Video Display Records at 11 kHz or 22 kHz sample rate Plays back at 11 kHz or 22 kHz sample rate Two speakers with enhanced stereo sound Allows playback and recording of ordinary audio compact discs 14-in. diagonal, 13-in. viewable screen Trinitron CRT with high-contrast glass .
Specifications Electrical - 8 Electrical Line Voltage 100–240 VAC; Universal power supply Frequency 47–63 Hz, single phase Maximum Power 120 W
Specifications Physical - 9 Physical Dimensions Weight Height: 17.9 in. (45.5 cm) Width: 13.5 in. (34.4 cm) Depth: 16.5 in. (42.0 cm) 41.5 lb. (18.
Specifications Environmental - 10 Environmental Operating Temperature Storage Temperature 50–104°F (10–40°C) –30 to 116°F (–30 to 47°C) Relative Humidity 20–95% noncondensing Altitude 10,000 ft. (3048 m) maximum (operating) 15,000 ft.
K Service Source Troubleshooting Macintosh TV
Troubleshooting General/ - 1 General The Symptom Charts included in this chapter will help you diagnose specific symptoms related to your product. Because cures are listed on the charts in the order of most likely solution, try the first cure first. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. (Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.
Troubleshooting Symptom Charts/Video - 2 Symptom Charts Video Screen is black, too dark, or too bright; audio and drive operate 1 2 3 4 5 6 7 Out of convergence (color bleeds from text or lines) 1 2 3 Adjust contrast button on front bezel. Adjust brightness. Use Brightness Control Panel. Reset PRAM. Check yoke cable connection. Perform video adjustments. Refer to “Video” in Adjustments chapter. Replace analog board. Replace CRT. Perform convergence adjustment.
Troubleshooting Symptom Charts/Video (Continued) - 3 Video Single vertical or horizontal line is displayed (Continued) Note: A thin, gray, horizontal line may be visible across the bottom third of a lit screen. This line is inherent in the design of Trinitron monitors. Do not replace modules. Otherwise, Predominant color tint or color cannot be adjusted 1 2 Replace analog board. Replace CRT. 1 Perform video adjustments. Refer to “Video” in Adjustments chapter. Replace analog board.
Troubleshooting Symptom Charts/Video (Continued) - 4 Video (Continued) Screen is bright and audio is present, but no video information is visible 1 Picture breaks into diagonal lines, or picture rolls vertically or horizontally 1 Black screen spots (burnt phosphors) Replace CRT. 2 3 4 2 Perform video adjustments. Refer to “Video” in Adjustments chapter. Replace analog board. Replace chassis harness cable. Replace CRT. Perform video adjustments. Refer to “Video” in Adjustments chapter.
Troubleshooting Symptom Charts/Video (Continued) - 5 Video Screen jitters or flashes 1 2 3 4 Out of focus 1 2 3 (Continued) Verify that adjacent computer equipment is properly grounded. Move electrical devices away from monitor. Temporarily shut off all fluorescent lights in area. Check that all ground cables are secure. Disconnect floppy drive, CD-ROM drive and hard drive. Replace analog board. Perform focus adjustment. Refer to “Focus” in Adjustments chapter. Replace analog board.
Troubleshooting Symptom Charts/Video (Continued) - 6 Video (Continued) Flashing or wavy screen, or monitor emits high-pitched noise Replace analog board. Raster size too short/ tall or narrow/wide 1 Linearity bad (size of text/graphics differs at top, bottom, or sides of screen) 1 2 2 Adjust horizontal or vertical size control. Refer to Adjustments chapter. Replace analog board. Perform video adjustments. Refer to “Video” in the Adjustments chapter. Replace analog board.
Troubleshooting Symptom Charts/Video (Continued) - 7 Video Raster tilted or shifted 1 2 3 4 Raster distorted (barrel-shaped, corners not square, stretched or compressed at top of display, or sides not perpendicular) 1 2 3 4 (Continued) Verify that adjacent computer equipment is properly grounded. Move electrical devices away from monitor. Temporarily shut off all fluorescent lights in area. Perform appropriate geometric adjustments (see Adjustments chapter). Perform yoke adjustment.
Troubleshooting Symptom Charts/Video (Continued) - 8 Video Raster not centered 1 2 3 (Continued) Verify that adjacent computer equipment is properly grounded. Move electrical devices away from monitor. Temporarily shut off all fluorescent lights in area. Adjust horizontal or vertical center control. Refer to Adjustments chapter. Replace analog board.
Troubleshooting Symptom Charts/Floppy Drive - 9 Floppy Drive Audio and video are present, but internal floppy drive does not operate 1 2 3 4 Replace bad disk with known-good disk. Replace floppy drive. Replace logic board. Retain customer’s SIMMs. Replace chassis harness cable. Disk ejects; display shows icon with blinking “X” 1 2 3 4 Replace bad system disk with known-good system disk. Replace floppy drive. Replace logic board. Retain customer’s SIMMs. Replace chassis harness cable.
Troubleshooting Symptom Charts/Floppy Drive (Continued) - 10 Floppy Drive Does not eject disk Internal floppy drive runs continuously 1 2 (Continued) 3 4 Insert opened paper clip into hole beside floppy drive. Switch off system and hold mouse button down while switching system on (to complete eject cycle). Remove front drive bezel. Replace floppy drive. 1 2 3 Replace bad disk with known-good disk. Replace floppy drive. Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Hard Drive - 11 Hard Drive Internal or external hard drive does not operate 1 2 3 4 Verify that SCSI loopback card is not attached. Verify that external drive is properly terminated. Replace hard drive. Replace logic board. Retain customer’s SIMMs. Works with internal or external SCSI device but does not work with both 1 Verify that SCSI device ID switch setting on external device is higher than 0.
Troubleshooting Symptom Charts/CD-ROM Drive - 12 CD-ROM Drive CD-ROM drive does not accept disc 1 2 3 4 Replace disc (if dirty or damaged). Remove front drive bezel. Replace CD-ROM drive mechanism. Replace chassis harness cable. Volume control does not operate correctly 1 2 Reset PRAM. Replace chassis harness assembly. Macintosh cannot mount CD-ROM drive 1 2 3 Verify proper software installed. Start up from known-good Disk Tools or external SCSI device. Replace CD-ROM drive mechanism.
Troubleshooting Symptom Charts/Peripheral - 13 Peripheral Cursor does not move Cursor moves, but clicking the mouse button has no effect 1 2 3 4 5 Check mouse connection. If mouse was connected to keyboard, connect it to rear ADB port instead. If mouse works, replace keyboard. If mouse does not work in any ADB port, replace mouse. Reset PRAM. Replace logic board. Retain customer’s SIMMs. 1 2 Replace mouse. Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Peripheral (Continued) - 14 Peripheral Cannot double-click to open application, disk, or server 1 2 4 5 Remove extra system files on hard drive. Clear parameter RAM. Hold down
Troubleshooting Symptom Charts/Peripheral (Continued) - 15 Peripheral Known-good ImageWriter or ImageWriter II does not print 1 2 Known-good LaserWriter does not print 1 2 3 4 5 3 4 (Continued) Make sure that Chooser and Control Panel are set correctly. Replace printer driver and system software with knowngood. Reset PRAM. Replace printer interface cable. Replace logic board. Retain customer’s SIMMs. Make sure that Chooser and Control Panel are set correctly.
Troubleshooting Symptom Charts/Miscellaneous - 16 Miscellaneous Clicking, chirping, or thumping sound 1 2 Replace analog board. Replace logic board. Retain customer’s SIMMs. Smoke/odor 1 2 Inspect analog and logic boards for obvious signs of burnt components. Replace analog board. 1 2 3 4 5 6 Connect power cord. Switch power on. Replace power cord. Replace keyboard. Replace analog board. Replace logic board. Retain customer’s SIMMs.
Troubleshooting Symptom Charts/Miscellaneous (Continued) - 17 Miscellaneous (Continued) Screen shows “Sad Macintosh” icon and black vertical lines; screeching sound 1 2 Replace RAM SIMMs on logic board. Replace logic board. Retain customer’s SIMMs. Headphone jack does not operate correctly 1 2 Verify that headphone jack is seated properly. Replace chassis harness assembly. “Sad Macintosh” icon 1 2 Replace bad disk with known-good disk. Remove all internal and external IDE and SCSI devices.
K Service Source Take Apart Macintosh TV
Take Apart Rear Housing Rear Housing - 1 Rear Housing No preliminary steps are required before you begin this procedure. Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± Caution: Never use a grounding wriststrap until after discharging the CRT.
Take Apart Rear Housing Rear Housing - 2 1 2 Using a torx screwdriver, remove the five screws. Lift off the rear cover.
Take Apart Fan - 3 Fan Fan Before you begin, remove the rear cover. This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Caution: Never use a grounding wriststrap until after discharging the CRT.
Take Apart Fan - 4 Push out the two latches and remove the fan assembly.
Take Apart Analog Board - 5 Analog Board Analog Board Before you begin, do the following: • Remove the rear cover • Discharge CRT • Remove anode cap Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ± Caution: Never use a grounding wriststrap until after discharging the CRT.
Take Apart Analog Board - 6 Degauss Panel Ground Cable Ground Cable 1 Disconnect the two ground cables from the degauss panels.
Take Apart Analog Board - 7 2 Infrared Receiver Connector WARNING: High Voltage Areas Disconnect the infrared receiver connector.
Take Apart Analog Board - 8 3 Cable Retainer 4 Disconnect the following cables from the analog board: • Degauss cable from BP2 (use a small screwdriver to release the latch) • CRT cable from BD1 Remove the wires from the cable retainer. Replacement Note: If you are replacing the analog board, remove the cable retainer and reinstall it on the new board.
Take Apart Analog Board - 9 5 CRT Board Assembly Caution: Twisting, bending, or applying force to the video board assembly could damage the neck of the CRT. Be sure to pull the CRT board assembly straight off the CRT. Remove the CRT board assembly from the neck of the CRT.
Take Apart Analog Board - 10 6 Remove the analog board. Replacement Note: Perform the cutoff adjustment whenever you replace the analog board. See “Video” in the Adjustments chapter.
Take Apart I/O Door - 11 I/O Door No preliminary steps are required before you begin this procedure.
Take Apart I/O Door - 12 1 2 Tab Tab I/O Door Remove the two screws (if present). Push down on the two tabs and remove the I/O door.
Take Apart Logic Board - 13 Logic Board Before you begin, remove the I/O door. Logic Board Caution: You can access and remove the Macintosh TV logic board merely by removing the I/O door at the rear of the machine. Although upgrading the logic board is now extremely easy, do not neglect to follow proper ESD precautions: use a grounded workbench pad, and always wear a grounding wriststrap.
Take Apart Logic Board - 14 Pull out the logic board.
Take Apart Tuner Assembly - 15 Tuner Assembly Before you begin, remove the following: • I/O door • Logic board Tuner Assembly
Take Apart Tuner Assembly - 16 1 2 Mounting Tab Turn over the logic board. Using needlenose pliers, carefully twist the mounting tab of the tuner.
Take Apart Tuner Assembly - 17 3 4 Tuner Assembly Logic Board Turn over the logic board. Pull straight up on the tuner assembly and remove it from the logic board.
Take Apart Drive Bezel - 18 Drive Bezel No preliminary steps are required before you begin this procedure.
Take Apart Drive Bezel - 19 Using a flat-blade screwdriver, push up the latch. Pull down and remove the drive bezel.
Take Apart Floppy Drive - 20 Floppy Drive Before you begin, remove the drive bezel. Floppy Drive Caution: You can access and remove the Macintosh TV floppy drive merely by removing the drive bezel at the front of the machine. Although upgrading the floppy drive is now extremely easy, do not neglect to follow proper ESD precautions: use a grounded workbench pad, and always wear a grounding wriststrap.
Take Apart Floppy Drive - 21 1 Floppy Drive Push down the latch and pull out the floppy drive.
Take Apart Floppy Drive - 22 Floppy Drive Connector Adapter 2 3 Pull out the floppy drive connector adapter. Replacement Note: Be sure to reinstall the floppy drive connector adapter on the replacement floppy drive.
Take Apart Floppy Drive - 23 4 Carrier Remove the four mounting screws and remove the floppy drive from the carrier.
Take Apart Floppy Drive - 24 5 Floppy Drive Shield Floppy Drive Pull out the sides of the floppy drive shield, lift the back of the shield, and remove it from the floppy drive.
Take Apart CD-ROM Drive - 25 CD-ROM Drive Before you begin, remove the drive bezel. CD-ROM Drive Caution: You can access and remove the Macintosh TV CD-ROM drive merely by removing the drive bezel at the front of the machine. Although upgrading the CDROM drive is now extremely easy, do not neglect to follow proper ESD precautions: use a grounded workbench pad, and always wear a grounding wriststrap.
Take Apart CD-ROM Drive - 26 1 CD-ROM Drive Latch Pull up the latch and pull out the CD-ROM drive.
Take Apart CD-ROM Drive - 27 2 CD Connector Adapter CD Audio Adapter P ull out the CD connector adapter and the CD audio adapter. Replacement Note: Be sure to reinstall the CD connector adapter on the replacement CD-ROM drive.
Take Apart CD-ROM Drive - 28 3 CD-ROM Drive Carrier Remove the four mounting screws and remove the CD-ROM drive from the carrier. Replacement Note: Replace the carrier on the new CDROM drive.
Take Apart Hard Drive - 29 Hard Drive Before you begin, remove the I/O door. Hard Drive Caution: You can access and remove the Macintosh TV hard drive merely by removing the I/O door at the rear of the machine. Although upgrading the hard drive is now extremely easy, do not neglect to follow proper ESD precautions: use a grounded workbench pad, and always wear a grounding wriststrap.
Take Apart Hard Drive - 30 1 Hard Drive Latch P ush down the latch and remove the hard drive.
Take Apart Hard Drive - 31 2 Pull out the hard drive connector adapter. Replacement Note: Be sure to reinstall the hard drive connector adapter on the replacement hard drive.
Take Apart Hard Drive - 32 3 4 Carrier Hard Drive Remove the four screws. Remove the hard drive from the carrier. Replacement Note: Replace the carrier on the new hard drive.
Take Apart Chassis Harness Assembly - 33 Chassis Harness Assembly Before you begin, remove the following: • Drive bezel • I/O door • CD-ROM drive • Floppy drive • Hard drive • Logic board • Rear housing • Analog board Chassis Harness Assembly
Take Apart Chassis Harness Assembly - 34 This product contains high voltage and a high-vacuum picture tube. To prevent serious personal injury or equipment damage, review CRT safety in Bulletins/Safety. ±Warning: Chassis Harness Assembly Latches Never use a grounding wriststrap until after discharging the CRT. ±Warning: 1 Latches 2 Discharge the CRT. Press in the four latches and lift off the chassis harness assembly.
Take Apart Chassis Harness Assembly - 35 Chassis Harness Take Apart Strategy Background After product introduction, Apple Service adjusted the service strategy for the chassis harness assembly in Mac TV, LC 500 Series, and Performa 500 Series computers. Originally, the chassis harness assembly was a single service assembly. As of November 1994, the chassis harness assembly is divided into several service piece parts.
Take Apart Chassis Harness Assembly - 36 • Chassis 922-1824 supports the auto-insert Apple SuperDrive and CD-ROM drives earlier than the 300i+. This chassis requires a floppy drive adapter, and the CDROM connector bridge is about 1-1/2 inches above the CD-ROM drive bay. • Chassis 922-0557 supports the manual-insert Apple SuperDrive and CD-ROM drives earlier than the 300i+.
Take Apart Chassis Harness Assembly - 37 For more information, refer to Apple Service Guide, Macintosh Computers, Vol. 3 (1994), page 110.
Take Apart Chassis Harness Assembly - 38 Service Parts Now Available for Chassis 922-0767 076-0488 Shield Kit (EMI shielding) 922-1825 PCBA Front Panel (front panel control board) 922-1826 Speaker Assembly (speaker and wire) 922-0117 Screw
Take Apart Chassis Harness Assembly - 39 Chassis Harness Take Apart Procedures First remove the chassis harness assembly. EMI Shields 1 2 Remove the EMI shields in this order: lower shield, front drive and speaker shield, top panel shield. Remove the front panel control board shield if it is present.
Take Apart Chassis Harness Assembly - 40 Speaker Assembly First remove the EMI shields. Caution: The speaker wire connections on the chassis cable bridge are very fragile. Avoid removing or replacing the speaker wires unless you need to replace the chassis or have isolated the problem to the speaker wires. (That is, replace and test the speakers, front panel control board, and analog board first.
Take Apart Chassis Harness Assembly - 41 1 2 Disconnect the speaker wire spade connector from the back of the speaker. Remove the Phillips screws from the front of the speaker. Replacement Note: Detach the replacement speaker from its wires and connect the replacement speaker to the original speaker wires. Speaker Wires Note: The speaker wire connectors are very fragile. 1 2 Look down on the chassis cable bridge and locate the notches in the cable bridge on top of the wire connectors.
Take Apart Chassis Harness Assembly - 42 3 Slide out the wire connector. Replacement Note: The analog board slides into the computer and completes the connection to the speaker wires; thus, the speaker wire connectors must sit securely in the cable bridge. 4 Slide the speaker wire connector into its position in the cable bridge and press up until the connector is secure. You may need to use a jeweler's screw driver to adjust the small metal tab in the center of the speaker wire connector.
Take Apart Chassis Harness Assembly - 43 Front Panel Control Board First remove the EMI shields. 1 2 Disconnect the front panel control cable. Remove the Phillips screw and remove the board.
Take Apart Chassis Harness Assembly - 44 Logic Board Connector and Cable Assembly First remove the EMI shields, speaker assembly, and front panel control board. Overview of removal procedures (Detailed steps follow the overview.) First disconnect all the connections from the top of the chassis. Then route the cables through to the underside of the chassis and disconnect the logic board connector.
Take Apart Chassis Harness Assembly - 45 1 Hard Drive Connector CD-ROM Connector Left Speaker Cable Connector Right Speaker Cable Connector Analog Board Connector Bridge Cable Floppy Drive Connector Stand at the front of the chassis, looking down at the top of the chassis, and disconnect the following in the order listed: analog board connector, CD-ROM drive connector, and hard drive connector. (The connector tabs operate much like largescale SIMM slot connectors on logic boards.
Take Apart Chassis Harness Assembly - 46 2 3 4 5 Route the analog board and the CD-ROM/hard drive cables through the large square hole behind the CD-ROM drive bay. Push the floppy drive cable (if present) and front panel control cable to the underside of the chassis. Turn the chassis over and stand at the rear of the chassis. Release the three tabs from the sides and center of the logic board connector and remove the logic board connector and cable assembly.
Take Apart Chassis Harness Assembly - 47 Overview of replacement procedures (Detailed steps follow the overview.) Connect the logic board connector to the underside of the chassis, route the cables through the appropriate openings, and connect the connectors on the top and front of the chassis. After replacing the logic board connector and cable assembly, replace the speakers, front panel control board, and EMI shields.
Take Apart Chassis Harness Assembly - 48 2 Analog Board Connector Logic Board Connector CD-ROM Drive Cable/ Hard Drive Cable Control Panel Cable Floppy Drive Cable 3 Arrange the logic board connector and cable assembly as shown. Face the connector slot of the logic board connector toward the rear and from the back of the connector route the CDROM/hard drive, analog, and floppy drive cables under the connector.
Take Apart Chassis Harness Assembly - 49 Logic Board Connector and Cable Assembly 1 2 Slide the side extension of the logic board connector down the front side of the small keyed tabs. The logic board connector will snap into place. Note: Be sure the center tab snaps into place at the same time.
Take Apart Chassis Harness Assembly - 50 3 4 5 Route the floppy drive cable through its opening at the back of the floppy drive bay. Carefully route the analog and CD-ROM/hard drive cables through the large opening behind the CD-ROM drive bay Turn over the chassis so that the top is up and the speakers are at the front, facing you. Important: Be sure to reconnect the CD-ROM, hard drive, and analog connectors in the proper order.
Take Apart Chassis Harness Assembly - 51 8 9 facing the front of the chassis and the power cables facing toward the outside edge of the chassis. Slip the connector extension through the slot in the side of the chassis and slide the connector into place. Position the hard drive connector with the connector slot facing the rear of the chassis and the power cables facing toward the outside edge of the chassis.
Take Apart Chassis Harness Assembly - 52 10 To replace the speakers, front control panel board, and EMI shields, reverse the take-apart procedures above. Pay attention to the caution regarding the fragility of the speaker wire connectors and their replacement procedures.
Take Apart CRT - 53 CRT CRT Before you begin, remove the following: • Drive bezel • I/O door • CD-ROM drive • Floppy drive • Hard drive • Logic board • Rear cover • Analog board • Chassis harness assembly
Take Apart CRT - 54 This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Mounting Screws Degauss Panel Degauss Panel Never use a grounding wriststrap until after discharging the CRT. ±Warning: 1 Remove the four mounting screws and lift off the two degauss panels.
Take Apart CRT - 55 2 Lift off the CRT. Replacement Note: Be sure the infrared receiver cable is not caught under the CRT.
Take Apart Infrared Receiver - 56 Infrared Receiver Infrared Receiver Before you begin, remove the following: • Drive bezel • I/O door • CD-ROM drive • Floppy drive • Hard drive • Logic board • Rear cover • Analog board • Chassis harness assembly • CRT
Take Apart Infrared Receiver - 57 This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Infrared Receiver Never use a grounding wriststrap until after discharging the CRT. ±Warning: Push out the two latches and remove the infrared receiver.
Take Apart Front Bezel - 58 Front Bezel Front Bezel To remove the front bezel, remove the following: • Drive bezel • I/O door • CD-ROM drive • Floppy drive • Hard drive • Logic board • Rear cover • Analog board • Chassis harness assembly • CRT • Infrared receiver
Take Apart Front Bezel - 59 This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Front Bezel Caution: Never use a grounding wriststrap until after discharging the CRT.
K Service Source Additional Procedures Macintosh TV
Additional Procedures Battery Verification - 1 Battery Verification Before you begin, remove the following: • I/O door • Logic board If handled or discarded improperly, the lithium battery in the computer could explode. Review battery handling and disposal instructions in Bulletins/Safety.
Additional Procedures Battery Verification - 2 Caution: Review the ESD precautions in Bulletins/ Safety. 1 Negative Probe 2 Positive Probe 3 Set the voltmeter to the 10 volts DC scale. Hold the positive probe of the voltmeter to the positive end of the battery and the negative probe to the negative end of the battery. If the battery voltage is below 3.0 volts, replace the battery. Refer to “Battery Replacement” in this chapter.
Additional Procedures Battery Replacement - 3 Battery Replacement Before you begin, remove the following: • I/O door • Logic board If handled or discarded improperly, the lithium battery in the computer could explode. Review battery-handling and disposal instructions in Bulletins/Safety.
Additional Procedures Cover Battery Replacement - 4 Caution: To prevent ESD damage to components, wear a grounding wriststrap and use a grounded workbench pad. Review the ESD precautions in Bulletins/ Safety. 1 Battery Holder 2 Insert a small flatblade screwdriver into the top of the battery holder cover and gently push down and out with the screwdriver to release the tab. Repeat on the other end and remove the cover from the battery holder.
Additional Procedures Battery Replacement - 5 3 4 Grasp the battery and remove it from the holder. Return the battery to Apple for proper disposal. For battery packaging and labeling information, refer to the instructions in Bulletins/Safety.
K Service Source Adjustments Macintosh TV
Adjustments Geometry - 1 Geometry Before you begin, remove the rear cover. This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Adjustments Geometry - 2 Note: The controls on this monitor require a small hex-head plastic tool to make adjustments. If the tool is long, it will be too flexible, which will make fine adjustments difficult. Use a short hex-head plastic tool to minimize flexing. Do not use metal alignment tools—they are a shock hazard.
Adjustments Geometry - 3 Vertical Center 1 All-White Screen 2 Use Display Service Utility to display the All-White Screen test pattern. Using a hex-head plastic adjustment tool, adjust the vertical center (VS) control until the raster is centered (top to bottom) in the display area.
Adjustments Geometry - 4 Horizontal Center All-White Screen Using a hex-head plastic adjustment tool, adjust the horizontal center (HS) control until the raster is centered (side to side) in the display area.
Adjustments Geometry - 5 Vertical Size 1 All-White Screen 2 Using a hex-head plastic adjustment tool, adjust the vertical height (VH) control until the raster height is 7 inches (± 1/ 8 inch) or 176 mm (± 2 mm). Verify this height. If it is off, repeat the vertical size adjustment and, if necessary, the vertical center adjustment.
Adjustments Geometry - 6 Horizontal Size All-White Screen Note: Due to video features and timing differences across the Apple line of Macintosh computers, the width of the raster/image area on the Macintosh TV screen may vary up to 3/16 inch at each side of the screen. Perform the horizontal size adjustment to set the display to its proper width.
Adjustments Geometry - 7 Using a hex-head plastic adjustment tool, adjust the horizontal width (HW) control until the raster is 9 1/4 inches (± 1/8 inch) or 235 mm (± 2 mm).
Adjustments Geometry - 8 Focus 1 Focus WARNING: High Voltage Areas 2 Use Display Service Utility to display the Focus test pattern. Using a hex-head plastic adjustment tool, adjust the focus control until the Focus test pattern is as clear as possible.
Adjustments Video - 9 Video Before you begin, remove the rear cover. This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Note: Perform the cutoff adjustment prior to adjusting the white balance.
Adjustments Video - 10 Replacement Note: Perform the cutoff adjustment whenever you replace the CRT or the analog board.
Adjustments Video - 11 Cutoff Gray Bars Note: Perform the cutoff and white balance adjustments after the monitor has been on for at least 10 minutes. 1 2 Contrast Up Button Use Display Service Utility to display the Gray Bars test pattern. Press the Contrast Up button and set screen contrast to maximum.
Adjustments Video - 12 3 4 Select the Brightness Control Panel from the Apple menu. Drag the brightness control to midrange. Using a hex-head plastic adjustment tool, set the red (RB), green (GB), and blue (BB) background controls to the full counterclockwise positions.
Adjustments Video - 13 Note: To set the green and blue drive controls to their 3/4 position, turn the controls to their full clockwise position and then turn back 1/4 turn counterclockwise. 5 6 Set the green (GG) and blue (BG) drive controls clockwise to their 3/4 position. Set the sub-contrast control (SC) to its full clockwise position.
Adjustments Video - 14 7 Gray Bars 8 Using a hex-head plastic adjustment tool, adjust VG2 until the first bar in the test pattern is completely black and the second bar is barely visible. Set the sub-contrast control (SC) to the center position.
Adjustments Video - 15 White Balance Gray Bars Note: Perform the cutoff and white balance adjustments after the monitor has been on for at least 10 minutes. 1 2 Contrast Up Button Use Display Service Utility to display the Gray Bars test pattern. Press the Contrast Up button and set screen contrast to maximum.
Adjustments Video - 16 3 Gray Bars 4 5 Select the Brightness Control Panel from the Apple menu. Drag the brightness control to midrange. Note the predominant color. Using a hex-head plastic adjustment tool, alternately adjust the red (RB), green (GB), and blue (BB) background controls until there is no predominant color in the four darkest bars.
Adjustments Video - 17 Gray Bars Note: The darkest bar must remain completely black throughout the rest of the procedure. If you notice a predominant color in the darkest bar, readjust the appropriate background control. 6 7 I f necessary, adjust the blue (BG) and green (GG) drive controls until there is no predominant color in the four brightest bars.
Adjustments Video - 18 All-White Screen 8 9 green (GB), and blue (BB) background controls until there is no predominant color. Use Display Service Utility to display the All-White Screen.
Adjustments Video - 19 • Model 246: 25 on the red scale Important: Over time, light meter tolerance can vary. If you doubt your meter’s accuracy, verify the readings with a known-good light meter or photometer.
Adjustments Convergence - 20 Convergence Before you begin, remove the rear cover. Yoke Convergence Controls This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Adjustments Convergence - 21 1 Crosshatch I Convergence Control 2 Use Display Service Utility to display the Crosshatch I test pattern. Using a hex-head plastic adjustment tool, adjust the convergence control on the CRT video board for best overall convergence.
Adjustments Convergence - 22 3 N/S Amp Upper Correction Lower Correction Crosshatch I 4 5 Using a hex-head plastic adjustment tool, adjust the N/S amp control for best convergence of horizontal lines at the top and bottom of the screen. Adjust the lower correction control for best convergence of vertical lines at the bottom of the screen. Adjust the upper correction control for best convergence of vertical lines at the top of the screen.
Adjustments Geometric Distortion - 23 Geometric Distortion Before you begin, remove the rear cover. This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Adjustments Geometric Distortion - 24 1 2 Crosshatch I Use Display Service Utility to display the Crosshatch I test pattern. Verify that the boxes on the top row are the same size as the boxes on the bottom row, and the boxes on the left side are the same size as the boxes on the right side.
Adjustments Geometric Distortion - 25 ±Warning: The entire yoke Horizontal Bow assembly has very high voltage. To prevent electrical shock, do not touch the yoke assembly, the anode wire, or the yoke wires. 3 Pin Phase Vertical Angle 4 To determine which control to adjust, compare the display with the distortions shown. Using a hex-head plastic adjustment tool, adjust the control (see next page for control locations).
Adjustments Geometric Distortion - 26 5 6 Analog Board 7 Using a hex-head plastic adjustment tool, adjust the control that is appropriate for the distortion.
Adjustments Geometric Distortion - 27 phase adjustments. If you can’t correct the distortion, replace the analog board. See “Analog Board” in the Take Apart chapter.
Adjustments Yoke - 28 Yoke Before you begin, remove the rear cover. This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety.
Adjustments Yoke - 29 Because you must make yoke adjustments from the rear of the computer, use a mirror to view the computer screen. Do not reach around the computer to adjust collars and rings. ±Warning: Note: If you replace the CRT, you will probably need to adjust the yoke.
Adjustments Yoke - 30 1 2 Yoke Clamp Screw 3 Using an insulated Phillips screwdriver, loosen the yoke clamp screw two or three turns. Switch on the computer. With one hand, grasp the plastic yoke collar and rotate it until the top and bottom edges of the picture are parallel with the top and bottom of the bezel.
Adjustments Yoke - 31 Plastic Yoke Collar 4 5 6 Yoke Clamp Screw 7 Switch off and unplug the computer. Discharge the CRT. Hold the plastic yoke collar in position and carefully tighten the yoke clamp screw so that the collar cannot slip. Do not overtighten the screw. Replace the rear cover and switch on the computer.
Adjustments Yoke - 32 8 Verify that the top and bottom edges of the picture are parallel with the top and bottom of the bezel.
Adjustments Light Meter Setup - 33 Light Meter Setup This topic covers setup for three light meter models: R77, L-248, and 246. Model R77 (Apple part number 076-0310) is the newest model available. Model R77 The R77 light meter is capable of reading luminance from 10 to 1,000 footcandles (fc).
Adjustments Light Meter Setup - 34 from the lens. Three scales are shown on the light meter: • 200-1000 fc • 50-250 fc • 10-50 fc Because display screen luminance typically ranges from 10 to 50 fc, take readings from the bottom scale only.
Adjustments Light Meter Setup - 35 To measure a display screen’s luminance, 1 2 Set the scale switch to the bottom position (to set up the 10-50 fc scale). 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.
Adjustments Light Meter Setup - 36 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.
Adjustments Light Meter Setup - 37 Lens Model L-248 1 Side Switch Read Button 2 3 Red Area Scale 4 Press the red button on the back of the light meter. If the reading is out of the red area, replace the battery. Move the side switch to its upper position so that the scale reads 10 through 18. Uncover the lens of the meter. Place the lens against the middle of the screen and press the read button to read the scale.
Adjustments Light Meter Setup - 38 Model 246 Lens Swivel Head 1 2 3 Scale 4 Remove the metal slide, if installed, from the top of the light meter. Install the white lens with the red dot. Rotate the swivel head so the lens of the meter faces the monitor. Place the lens against the middle of the screen and read the scale.
K Service Source Exploded View Macintosh TV
Exploded View 1 Exploded View Screw (5) Rear Housing 922-0883 I/O Door 922-0884 Screw Fan 922-1803 Rear Case Access Cover Rear Case Access Cover Shield Rubber Feet Internal Microphone Assembly CRT 661-1666 Analog Board 661-0872 Hard Drive Connector Adapter 922-1820 Hard Drive 661-1750 Front Bezel 922-0881 Drive Bezel 922-0882 Hard Drive Carrier 922-1806 Screw (4) Floppy Drive Floppy Shield Drive 922-1808 661-0474 Logic Board 6ii61-1724 Chassis Harness Assembly 922-0767 922-1824 CD Audio Adapter 92
