Apple Macintosh TV Service
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Apple Macintosh TV, Troubleshooting Symptom Charts/CD-ROM Drive - 12 CD-ROM Drive CD-ROM drive does not accept disc 1 Replace disc (if dirty or damaged). 2 Remove front drive bezel. 3 Replace CD-ROM drive mechanism. 4 Replace chassis harness cable. Volume control does not operate correctly 1 Reset PRAM. 2 Replace chassis harness assembly. Macintosh cannot mount CD-ROM drive 1 Verify proper software installed. 2 Start up from known-good Disk Tools or external SCSI device. 3 Replace CD-ROM drive mechanism.
Apple Macintosh TV, Adjustments Convergence - 20 Convergence Before you begin, remove the rear cover. ± Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. Yoke Convergence CRT Video WARNING: High Voltage Areas Controls Board
Apple Macintosh TV, 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.
Apple Macintosh TV, Take Apart Infrared Receiver - 56 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 Infrared Receiver
Apple Macintosh TV, Take Apart Chassis Harness Assembly - 39 Chassis Harness Take Apart Procedures First remove the chassis harness assembly. EMI Shields 1 Remove the EMI shields in this order: lower shield, front drive and speaker shield, top panel shield. 2 Remove the front panel control board shield if it is present.
Apple Macintosh TV, Take Apart Chassis Harness Assembly - 48 2 Arrange the logic board connector and cable assembly as shown. 3 Face the connector slot of the logic board connector toward the rear and from the back of the connector route the CD- ROM/hard drive, analog, and floppy drive cables under the connector. Extend the control panel connector cable from the back of the logic board connector toward the front of the chassis. Control Panel Cable Floppy Drive Cable Analog Board Connector Logic Board Connector CD-ROM Drive Cable/ Hard Drive Cable
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 c
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 contro
Apple Macintosh TV, Adjustments Geometry - 6 Horizontal Size 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. All-White Screen
Apple Macintosh TV, Additional Procedures 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 Insert a small flat- blade screwdriver into the top of the battery holder cover and gently push down and out with the screwdriver to release the tab. 2 Repeat on the other end and remove the cover from the battery holder. Battery Cover Holder
Apple Macintosh TV, 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.
Apple Macintosh TV, Additional Procedures Battery Verification - 2 Caution: Review the ESD precautions in Bulletins/ Safety. 1 Set the voltmeter to the 10 volts DC scale. 2 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. 3 If the battery voltage is below 3.0 volts, replace the battery. Refer to “Battery Replacement” in this chapter. Positive Negative Probe Probe
Apple Macintosh TV, Specifications Sound and Video - 7 Sound and Video Sound Generator 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 Video Display 14-in. diagonal, 13-in. viewable screen Trinitron CRT with high-contrast glass .26-mm aperture grille pitch 640 pixels by 480 lines; 70 dpi
Apple Macintosh TV, Adjustments Video - 18 green (GB), and blue (BB) background controls until there is no predominant color. 8 Use Display Service Utility to display the All-White Screen. 9 Using the light meter, adjust the sub-contrast control (SC) until the luminance measures 33 foot Lamberts (± 3 foot lamberts), which on the light meter is • Model R77: 25 on the bottom scale • Model L-248: middle of the10 scale All-White Screen
Take Apart CRT - 54 ±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Never use a grounding wriststrap until after discharging the CRT. 1 Remove the four mounting screws and lift off the two degauss panels. Mounting Screws Degauss DegaussPanel Panel
Apple Macintosh TV, Troubleshooting Symptom Charts/Hard Drive - 11 Hard Drive Internal or external hard drive does not operate 1 Verify that SCSI loopback card is not attached. 2 Verify that external drive is properly terminated. 3 Replace hard drive. 4 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. Also verify that ID switch setting on external SCSI device does not duplicate ID switch settings on any other attached external SCSI devices. 2 Replace terminator on external SCSI device. 3 Replace SCSI select cable.
Apple Macintosh TV, Troubleshooting Symptom Charts/Miscellaneous (Continued) - 17 Miscellaneous (Continued) Screen shows “Sad Macintosh” icon and black vertical lines; screeching sound 1 Replace RAM SIMMs on logic board. 2 Replace logic board. Retain customer’s SIMMs. Headphone jack does not operate correctly 1 Verify that headphone jack is seated properly. 2 Replace chassis harness assembly. “Sad Macintosh” icon 1 Replace bad disk with known-good disk. 2 Remove all internal and external IDE and SCSI dev
Apple Macintosh TV, Take Apart Infrared Receiver - 57 ±Warning: This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins/Safety. ±Warning: Never use a grounding wriststrap until after discharging the CRT. Push out the two latches and remove the infrared receiver. Infrared Receiver
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