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Service Source
eMac ATI Graphics/ USB 2.0/2005
Updated 3 May 2005
© 2005 Apple Computer, Inc. All rights reserved.
USB 2.0/2005
eMac ATi Graphics/ USB 2.0/2005 - 1
Service Source
Basics
eMac ATI Graphics/USB 2.0/ 2005
© 2005 Apple Computer, Inc. All rights reserved.
Overview
What's New (May 2005)
eMac (2005)
Apple introduced new eMac models, featuring faster PowerPC G4 processors, more RAM, larger hard drives, faster graphics and more graphics memory, and an improved SuperDrive. · Revised logic boards · 661-3539 1.42 GHz board: · 661-3610 1.25 GHz board: EEE code T6C, T6D, T6G, T6H, T6J, T6K · New optical drives: · 661-3538, Combo, 32x · 661-3536, SuperDrive, 8x · New hard drives: · 661-3534, 80 GB · 661-3535, 160 GB · Memory, 333 MHz DDR · 661-3541, 512 MB
Overview
eMac ATi Graphics/ USB 2.0/2005 Basics - 1
What's New (April 2004)
eMac (USB 2.0)
Apple announced a revision to the eMac product family. Powered by G4 processors running at up to 1.25GHz, with a system bus of 167 MHz, the new eMac models come with Mac OS X v.10.3 and include Apple's iLife application suite, providing iMovie, iPhoto, and iTunes as a standard software configuration. The changes include the following: · No-optical drive configuration: This computer is available in a low-cost no-optical drive configuration · Mac OS X 10.3 · Modem: except for the educational configuration, the eMac (USB 2.0) has an internal, fax modem (soft modem). The modem appears to the system as a serial port that responds to AT commands. · Bluetooth (optional): Fully integrated Bluetooth is available as a build-to-order option · 922-6201 Bluetooth board · 922-6402 Bluetooth antenna · USB 2.0 ports: This computer has three USB 2.0 ports · Revised logic boards · 661-3279 1 GHz board: EEE code QDJ or QHL. · 661-3280 1.25 GHz board: EEE code QDK or QHM · New optical drives: · 661-3281, CD-ROM, 32x · 661-3282, Combo, 32x · 661-3283, SuperDrive, 8x · New hard drives: · 661-3209, 80 GB · 661-3266, 160 GB (CTO) · Memory, 333 MHz DDR · 661-3322, 512 MB The RAM expansion modules used in the eMac (USB 2.0) computers are 184-pin SDRAM DIMMs (dual inline memory modules) that are 2.5 V, unbuffered, 8-byte, non-parity, and PC2700 compliant. The speed of the SDRAM devices must be rated at 167 MHz (7 ns) or faster. Refer to Kbase article 86718 for more information. Important: The memory expansion cards (DIMMs) must use SDRAM devices as specified above. DIMMs for previous models of eMac or DIMMs that use EDO or SGRAM devices will not work. If they are installed, the computer will beep, and the power light will flash several times when you turn on the computer. This indicates that the computer cannot find any useable RAM. · Faraday Shield · 922-6407 · Optical Plate (used on the no-optical drive configuration only) · 922-6408 2 - eMac ATI Graphics/ USB 2.0/2005 Basics Overview
· Inner AirPort Door (blank, used on the no-optical drive configuration only) · 922-6406 · Heatsink with/clip · 076-1079 · Wireless Antenna · 922-6401 · Wireless Antenna clips · 922-6405 · Kit, Feet, Captive Screws · 076-1034
Service and Support
The service and support strategy for the new eMacs is the same as previous eMac models.
Overview
eMac ATi Graphics/ USB 2.0/2005 Basics - 3
What's New (October 2003)
Apple announced a revision to the eMac product family. Powered by G4 processors running at up to 1GHz, the new eMacs come with Mac OS X v.10.3 "Panther," and include Apple's iLife application suite, providing iMovie, iPhoto, and iTunes as a standard software configuration. The revision to the eMac (ATI Graphics) includes the following: · Revised logic board, part number 661-3014, 1 GHz, Ver. 2 (EEE code Q11) Refer to the Take Apart chapter, Logic Board/Logic Board Information for details on how to identify the Version 2 board. · New optical drives: · 661-3012, CD-ROM, 32x, drive · 661-3015, Combo, 32x, drive · 661-3013, SuperDrive, 4x · New hard drives: · 661-3011, 80 GB · 661-3016, 160 GB (CTO) · Mac OS X 10.3 · Updated Apple and third-party bundled software
Service and Support
The service and support strategy for the new eMacs is the same as previous eMac models.
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Overview
Overview
eMac ATi Graphics/ USB 2.0/2005 Basics - 5
Service Source
Take Apart
eMac ATI Graphics/ USB 2.0/2005
© 2005 Apple Computer, Inc. All rights reserved.
Tools
The following tools are recommended for the take apart procedures. · 2.5 mm hex (for rear housing) · Nylon probe tools (922-5065) · Phillips #1 screwdriver · Phillips #2 screwdriver · Jeweler's screwdriver set · Needlenose pliers · ESD wriststrap and mat · CRT discharge tool Note: Do not use a power driver on the rear housing screws.
Tools
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 1
CRT Neck/Display/Analog Assembly Handling Information
Handling
Important: It is imperative that proper handling and packaging guidelines be followed when working with the display/analog assembly. Do NOT lift, handle, bump, or manipulate the CRT neck/neck board (see arrows below) on the Display/Analog assembly. Modules damaged by mishandling are NOT covered by Apple Warranty. Apple Authorized Service Providers can be liable for broken CRT necks due to improper handling. Caution: The metal chassis has sharp edges, you may want to wear gloves when handling the assembly. Lift the assembly from the metal chassis; never lift the assembly from the neck. I
Packing a Defective Display/Analog Assembly
The packing procedure is included with the replacement display/analog assembly. Incorrect packaging can result in damaged eMac (ATI Graphics) displays. Please read and follow the directions enclosed in the shipping box of the new display prior to packaging the defective assembly. AASPs can be liable for broken CRT necks due to improper packing and handling.
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CRT Neck/Display/Analog Assembly Handling Infor-
Rear Housing
Tools
· 2.5 mm hex (for the rear housing) · Phillips #2 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat.
Rear Housing
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 3
Procedure
1. Remove seven hex screws around the perimeter of the rear housing. 2. Remove the three Phillips screws; one used for the user access door, and two used for the feet. Note: Newer models have a captive screws.
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Rear Housing
3. Gently lift the rear housing up about four inches.
4. Disconnect the power button cable located on the inside the rear housing.
5. Lift the rear housing off the computer.
Rear Housing
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 5
User Access Door
Tools
This procedure requires the following tools: · Phillips #2 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat.
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User Access Door
Procedure
1. Remove the screw on the user access door (shown below). Note: Newer models have a captive screw. 2. Gently remove the access door.
User Access Door
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 7
Feet
Tools
This procedure requires the following tools: · Phillips #2 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat.
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Feet
Procedure
1. Remove the two foot screws. Note: Newer models use captive screws.
Feet
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Power Button
Tools
· Needlenose pliers Note: Follow the Replacement Note procedure (step 2) only if you are replacing a defective power button.
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access panel. · Remove the feet. · Remove the rear housing.
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Power Button
Procedure
1. Disconnect the power button cable from the power button located inside the rear housing.
2. Lift the rear housing off the bezel. Replacement Note: Refer to the topic on the next page, "Power Button Cable Check" before replacing the rear housing.
Power Button
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Power Button Cable Check
1. Check that the power button cable in drawn tight before you attach the other end of the cable to the power button (located inside the rear housing).
2. Also, check that the cable is tucked under the chassis tab (as shown) and that the black mark on the cable lines up with the chassis (circled below).
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Power Button
Power Button Replacement
1. Continue with this procedure only if you are replacing a defective power button. With a needlenose pliers, push the power button through the retaining ring. The power button will pop off rear housing and the retaining ring may get stuck on the pliers.
2. Obtain the new power button and peel the sticky backing off the power button. Position the power button into the hole on the rear housing (as shown below). Note: The picture below is looking at the power button from the inside of the rear housing.
3. Place the retaining ring over the power button connector and press down firmly.
Power Button
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CRT Discharge
Warning: This product contains high voltage and a high-vacuum picture tube. To prevent injury, always review the Service Foundations: CRT Displays course for safety information. It can be found at: http://service.info.apple.com/service_training/training.html. Click on Desktop Certification Courses and select the Service Foundations: CRT Displays link. Warning: Never use a grounding wriststrap until after discharging the CRT and setting up an ongoing ground connection.
Safety Guidelines:
Whenever the rear housing of the computer is removed and before replacing a module, you must 1. Discharge the CRT (shown below) and remove the anode cap.
2. Establish an ongoing ground by using a cable with alligator clips at both ends. Connect one end to the anode aperture, and connect the other end to the metal CRT frame (as shown below). 3. With the CRT discharged and the ongoing ground in place wear a grounding wriststrap to prevent equipment damage from static electricity.
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CRT Discharge
Faraday Plate
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Preliminary Steps
· · · · · Place the computer face down on an ESD mat. Remove the user access door. Remove the feet. Remove the rear housing. Discharge the CRT.
Faraday Plate
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 15
Procedure
1. Remove the four screws on the Faraday plate. Replacement Note: Note the position of the gray cable (see red arrow) on the top left side of the Faraday plate. Be careful the cable doesn't get pinched when the Faraday plate is replaced.
2. Gently pry the top half of the Faraday plate away from the chassis in the direction of the arrows. Note: The gray cable (on left) rests in a groove under the Faraday plate.
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Faraday Plate
3. Pull the Faraday plate back (#1) and then push it down (#2) to unhook the metal tabs on the Faraday plate from the cutouts (see graphic on the next page) in the chassis.
4. Continue to pull the Faraday plate back (#1) to unhook the tabs from the chassis. Pull the Faraday plate up (#2) to remove it from the chassis.
Faraday Plate
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Faraday Replacement
1. Looking from the top down, line up the metal tabs with the cutouts in the chassis (circled on the right and left) and the slots on the Faraday plate with the white plastic guides on the bezel (circled on the right and left sides of the optical drive). 2. Raise the Faraday plate up and attach it to the frame on the digital assembly. Be careful that the gray cable (shown in step 2 on the previous page) does not get pinched in the Faraday plate.
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Faraday Plate
Speakers
Tools
This procedure requires the following tools: · Phillips #2 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the Faraday plate
Speakers
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Procedure
1. Remove the left and right speaker screws (circled in the top photos). There are three screws per speaker. 2. Disconnect the two spade connectors (see rectangles in the top photos) on each speaker.
3. Lift the speakers out of the front bezel.
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Speakers
Fan
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. Fan eMac ATI Graphics/ USB 2.0/2005 Take Apart - 21
Procedure
1. On the left side of the fan, disconnect the fan cable and remove the two screws (circled).
2. On the right side of the fan, remove three screws (the green cable goes to the ground screw). Replacement Note: The screw circled on the top left is a self-tapping screw, and the screw on the bottom left is a fine thread screw.
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Fan
3. Wiggle the fan cable up and out of the groove in the chassis and then disconnect the fan connector from the board.
4. To remove the fan, turn the computer so the fan is facing you. Grab onto the fan near the AC plug and the bottom right corner of the fan. Gently pull the fan toward you and away from the chassis. Be very careful of the CRT neck.
Fan
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Optical Drive
Tools
This procedure requires the following tools: · Phillips #2 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. · Remove the Faraday plate.
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Optical Drive
Procedure
1. Disconnect the data cable and the power cable at the top of the optical drive.
2. Remove the four screws connecting the optical drive to the chassis.
3. Holding the optical drive by the top or bottom end, tilt the optical drive out of the chassis. Replacement Note: Remove the EMI shield off the end of the defective optical drive. Place the EMI shield on the replacement drive. Optical Drive eMac ATI Graphics/ USB 2.0/2005 Take Apart - 25
No Optical Configuration
Note: There is new configuration on the eMac (USB 2.0) that is sold without an optical drive (shown below). If you decide to add an optical drive at a later date, order the parts mentioned in the Upgrades chapter under the topic "Optical Drive Installation."
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Optical Drive
Bluetooth
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat · Remove the user access door · Remove the feet · Remove the rear housing · Discharge the CRT · Remove the Faraday plate
Bluetooth
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Procedure
1. Remove the two screws on the Bluetooth board.
2. With two fingers, gently wiggle the Bluetooth board off the connector on the logic board.
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Bluetooth
3. Turn the Bluetooth board over and carefully disconnect the Bluetooth antenna cable from the board.
4. To remove the Bluetooth antenna cable, pull the cable through the hole in the chassis.
Bluetooth
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 29
5. WIth the nylon tool (922-5065), pry the antenna fixture off the front bezel. The antenna is attached to the front bezel with double-stick tape.
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Bluetooth
Digital Assembly
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Digital Assembly
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Part Location (without optical drive)
Note: There is new configuration on the eMac (USB 2.0) that is sold without an optical drive (shown below). The take apart for the digital assembly is the same.
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat · Remove the user access door · Remove the feet · Remove the rear housing · Discharge the CRT · Remove the fan · Remove the Faraday plate · Remove the AirPort Extreme Card (if present) · Remove the Bluetooth board (if present)
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Digital Assembly
Procedure
1. With the back of the computer facing you, remove the three screws near the top of the digital assembly.
2. On the top left side of the digital assembly, disconnect the power button cable and the video cable Note: The power connector (the smaller connector) was on the other side of the board on previous eMac models. This picture shows the most recent model.
Digital Assembly
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3. Remove two screws; one on each side of the digital assembly.
4. On the bottom left side of the digital assembly, remove three screws.Note: The two screws (towards the top of this photo) are the same type screw; the third screw is a larger, self-tapping screw that attaches to the front bezel.
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Digital Assembly
5. Disconnect the four cable connectors on the bottom left side of the assembly. From left to right the connectors are: microphone, fan, LED, and speakers.
6. Remove the two screws on the bottom right side of the assembly. Note: The screw that attaches to the plastic bezel is a larger, self-tapping screw.
Digital Assembly
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7. Hold the digital assembly by the sides and pull the assembly straight back. The digital assembly disconnects from the blind mate connector (circled) on the chassis. Set the digital assembly aside.
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Digital Assembly
Hard Drive
Tools
This procedure requires the following tools: · Phillips #2 · Phillips #1
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. Hard Drive eMac ATI Graphics/ USB 2.0/2005 Take Apart - 37
· Remove the fan. · Remove the Faraday plate. · Remove the digital assembly.
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Hard Drive
Procedure
1. Remove the four screws along the back of the metal chassis. Note: The two outer screws are fine thread screws.
2. Gently unhook (see circle) and lift the hard drive carrier up and off the chassis. Flip the drive carrier over to access the data and power cables.
Hard Drive
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 39
3. With the drive carrier flipped over (#1), disconnect the data cable (#2) and the power cable (#3) from the hard drive.
4. To remove the hard drive from the carrier, remove two screws on the side of the carrier.
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Hard Drive
5. Tilt the drive to access the cable. Disconnect the cable from the hard drive. Note: If you are replacing the drive carrier, review the procedure "Thermal Pad and EMI Replacement" below.
Thermal Pad and EMI Replacement
1. If you are replacing the hard drive carrier, attach the thermal pad, and two rubber bumpers to the top side of the carrier. Note: These pieces come with the replacement carrier. Then, go on to the next step.
Hard Drive
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2. Attach two the EMI pads to the bottom side of the carrier.
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Hard Drive
Logic Board Heatsink
Tools
This procedure requires the following tools: · Screwdriver to pry the heatsink clip
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. · Remove the Faraday plate. · Remove the digital assembly. · Remove the hard drive carrier. Logic Board Heatsink eMac ATI Graphics/ USB 2.0/2005 Take Apart - 43
Procedure
1. Remove the one screw attaching to the chassis (on the top left side). Next, with a nylon probe tool (922-5065), push the heatsink clip through the hole in the logic board. The clip will come loose on the top side of the logic board.
2. Unclip the other end of the heatsink clip on the top side of the logic board.
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Logic Board Heatsink
3. Lift the heatsink from the logic board. Warning: The the CPU heatsink should have minimum handling of the fins. Be very careful when handling this part. Replacement Note: Whenever the heatsink is removed, the bottom side of the heatsink and the top of the microprocessor must be cleaned and new thermal paste must be applied to the microprocessor. If the mating surfaces are not cleaned and thermal paste is not applied, the CPU may overheat and become damaged. Refer to the next topic, "Thermal Paste Application".
Logic Board Heatsink
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 45
Thermal Paste Application
The microprocessor uses a heatsink/thermal pipe to transfer heat away. Whenever the heatsink is removed, the bottom side of the heatsink and the top of the microprocessor must be cleaned and thermal paste must be applied. If the mating surfaces are not cleaned and thermal paste is not applied, the CPU may overheat and become damaged.
Tools
This procedure requires the following tools: · Plastic stylus or nylon probe tool (922-5065) to remove the old thermal paste · Thermal paste (922-4757), each tube contains 4-5 applications
Procedure
1. Thoroughly clean the thermal film from the heatsink surface with a plastic stylus or the nylon probe tool. Do not use an abrasive material or liquid cleaner. Important: Be extremely careful not to bend the fins on the heatsink.
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Thermal Paste Application
2. Carefully remove the old thermal paste from the surface of the microprocessor. Gently remove the paste with a plastic stylus or nylon probe tool.
3. Squeeze a drop of thermal paste onto the middle of the microprocessor as shown.
Thermal Paste Application
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4. Spread the paste evenly over the processor. Important: On this product, it is critical to spread the paste over the processor, or the chip could overheat.
5. Reinstall the heatsink and the heatsink clip.
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Thermal Paste Application
Logic Board
Tools
This procedure requires the following tools: · Phillips #2 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. · Remove the Faraday plate.
Logic Board
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· Remove the digital assembly. · Remove the hard drive carrier · Remove the AirPort Extreme Card (if present)
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Logic Board
Procedure
1. Disconnect the optical data cable, the optical power cable and release the heatsink clip. Note: On education models the optical cables are not present because there isn't an optical drive.
2. Remove the down converter screw that attaches to the chassis frame.
Logic Board
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 51
3. On the left side, disconnect the power button cable and the modem cable. Note: On newer models the power button connector is in the same general location, but on the other side of the logic board.
4. Remove the one screw attaching to the chassis (on the top left side). Push the heatsink clip through the hole in the logic board. The clip will come loose on the top side of the logic board.
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Logic Board
5. Unclip the heatsink clip on the top side of the logic board.
6. Lift the heatsink from the logic board. Warning: The the CPU heatsink should have minimum handling of the fins. Be very careful when handling this part. Replacement Note: Whenever the heatsink is removed, the bottom side of the heatsink and the top of the microprocessor must be cleaned and new thermal paste must be applied to the microprocessor. If the mating surfaces are not cleaned and thermal paste is not applied, the CPU may overheat and become damaged. Refer to the next topic, "Thermal Paste Application".
Logic Board
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7.
Remove the four screws on the logic board.
8. To remove the logic board from the chassis frame, unhook the chassis clips under the I/O panel and on the top right side of the chassis frame.
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Logic Board
9. Hold the board by the down converter (#1) and gently pull the chassis frame (#2) forward, away from the board. Remove the logic board (#3) from the chassis frame. Carefully maneuver the board out of the frame. Important: The microprocessor uses a heatsink/thermal pipe to transfer heat away. Whenever the heatsink is removed, the bottom side of the heatsink and the top of the microprocessor must be cleaned and thermal paste must be applied to the microprocessor. If the mating surfaces are not cleaned and thermal paste is not applied, the CPU may overheat and become damaged. Refer to "Thermal Paste Application" in this chapter.
Logic Board
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Logic Board Identification:
There is one 800 MHZ board, three 1 GHz logic boards, and one 1.25 GHz board for this product. The boards need to be exchanged like-for-like. Use the EEE codes to identify the boards. The graphic below shows the general location of the barcode label for the logic boards.
· 661-2853, 800 MHz: EEE code PLB · 661-2854, 1 GHz: EEE code, NMA · 661-3014, 1 GHz, Ver. 2: EEE code, Q11, which will either be a sticker above the barcode (shown below), or Q11 will be embedded in the barcode. · 661-3279 1 GHz board, USB 2.0: EEE code QDJ or QHL. · 661-3280 1.25 GHz board, USB 2.0: EEE code QDK or QHM
eMac (ATI Graphics) 1 GHz logic board 661-3014
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Logic Board
eMac (USB 2.0) 1.25 GHz logic board, 661-3280 Replacement Note: Before returning the logic board to Apple, remove the following items: · I/O panel frame · RJ-11 connector (if present) · Modem board · Memory · Heatsink · Down converter · AirPort Extreme Card (if present) · Bluetooth board (if present)
Logic Board
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 57
Down Converter
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. · Remove the Faraday plate. · Remove the digital assembly.
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Down Converter
Procedure
1. Remove the screw attaching the down converter to the chassis frame.
2. Turn the logic board right side up. Hold the board by the down converter (#1) and gently pull the chassis frame (#2) away from the board. Remove the logic board (#3) out of the chassis frame. Carefully maneuver the logic board out of the frame.
Down Converter
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3. Important: The down converter board is fragile. Be careful not to flex the board too much when removing or inserting a replacement down converter.
4. Turn the logic board over so you can see the logic board-to-down converter connector. Pull the down converter in the direction of the arrow to disconnect the board from the logic board.
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Down Converter
5. Slide the down converter off the logic board in the direction of the arrow. Important: For replacement instructions, refer to the next topic.
Down Converter
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Replacing the Down Converter
1. Important: Be careful when installing the down converter; the board is fragile. Hold the down converter by the top of the board (as shown below). Carefully slide the down converter onto the logic board in the direction of the arrow.
2. With the down converter in place, squeeze the pins (circled below) and the connector together for a solid connection.
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Down Converter
I/O Panel
Tools
This procedure requires the following tools: · Phillips #2 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. · Remove the Faraday plate.
I/O Panel
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· Remove the digital assembly. · Remove the logic board.
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I/O Panel
Procedure
1. Remove the logic board from the chassis frame to access the I/O panel.
2. Remove the two I/O panel screws.
I/O Panel
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 65
3. First, pull the I/O panel away from the ports (#1) on the logic board. Next, carefully pull the I/O fence away from the connectors on the end of the board (#2).
66 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
I/O Panel
RJ-11 Cable
Tools
· Nylon probe tool (922-5065)
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. · Remove the Faraday plate. · Remove the digital assembly. · Remove the logic board · Remove the I/O panel
RJ-11 Cable
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 67
Procedure
1. Disconnect the RJ-11 cable from the modem.
2. Turn over the logic board. There is a small pry slot on the board for a screwdriver blade to get behind the connector. See the next step.
68 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
RJ-11 Cable
3. Carefully push the RJ-11 port connector off the logic board with a nylon probe tool or screwdriver.
RJ-11 Cable
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 69
AirPort Extreme Card
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer so that the front of the computer faces you.
70 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
AirPort Extreme Card
Procedure
1. Press the optical door in on one side and pull the door open on the other side to access the AirPort access panel.
AirPort Extreme Card
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 71
2. Loosen the two captive screws on the access panel. Remove the access panel. Note: On entry level models you won't see the optical tray when you remove the access panel. The access panel is a"blank" piece of plastic that covers the hole where an optical drive would be present (see next graphic).
3. The picture below shows the entry level eMac model Airport access door . Notice the absence of the optical drive.
72 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
AirPort Extreme Card
4. Remove the access panel.
5. Untuck the clear tab attached to the AirPort Extreme Card.
AirPort Extreme Card
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 73
6. Pull the AirPort Extreme Card out of the slot a little bit to access the antenna connected to the card.
7. Disconnect the antenna cable from the AirPort Extreme card.
8. Pull the tab to remove the AirPort Extreme card from the slot. Refer to the next page to see the internal difference of the entry level eMac.
74 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
AirPort Extreme Card
9. This picture shows removing the AirPort card from the entry level eMac model. Notice the metal optical plate covering the location where the optical drive would be present.
AirPort Extreme Card
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 75
LED
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT.
76 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
LED
· Remove the fan. · Remove the Faraday plate.
LED
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 77
Procedure
1. Remove one screw and disconnect the LED cable. Important: The connector is very fragile, remove it gently. Lift the LED board off the front bezel.
78 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
LED
Front Bezel
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. Front Bezel eMac ATI Graphics/ USB 2.0/2005 Take Apart - 79
· Remove the Faraday plate. · Remove the digital assembly · Remove the display/analog assembly
80 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
Front Bezel
Procedure
1. Remove the eight bezel screws. There are three on each side and two at the top of the bezel. Important: DO NOT remove the two larger screws circled below, or the two screws shown in the next photo. If they are removed, the CRT will be out of alignment and the entire display/analog assembly will need to be replaced.
2. Important: On this side of the computer, do NOT remove the CRT screws located under the red circles. The CRT will be out of alignment if these screws are removed.
Front Bezel
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 81
3. Carefully lift the display/analog assembly off the bezel. 4. Remove the microphone, speakers, and LED from the bezel.
5. Note: Remove the antenna board from the display/analog assembly before returning the display/analog assembly to Apple. Refer to the next procedure, "Antenna Board" for details.
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Front Bezel
Antenna Board (eMac ATI Graphics)
Tools
This procedure requires the following tools: · Phillips #2 screwdriver · Needlenose pliers or flat blade screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Remove the AirPort Extreme card · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. Antenna Board (eMac ATI Graphics) eMac ATI Graphics/ USB 2.0/2005 Take Apart - 83
· Remove the Faraday plate. · Remove the digital assembly. · Remove the displayl/analog assembly.
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Antenna Board (eMac ATI Graphics)
Procedure
1. Remove one screw on the antenna board. Next, peel back the masking tape and pull the unused end of the antenna through the hole in the digital/analog chassis.
2. Carefully position the computer so that the CRT faces you. Locate the metal antenna bracket at the top of the CRT. Remove the screw on the bracket, then pry the antenna cable from the two clips on the side of the CRT.
Antenna Board (eMac ATI Graphics)
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 85
Antenna Board (eMac USB 2.0)
Tools
This procedure requires the following tools: · Phillips #2 screwdriver · Needlenose pliers or flat blade screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Remove the AirPort Extreme card · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. 86 - eMac ATI Graphics/ USB 2.0/2005 Take Apart Antenna Board (eMac USB 2.0)
· Remove the Faraday plate. · Remove the digital assembly. · Remove the digital/analog assembly.
Antenna Board (eMac USB 2.0)
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 87
Procedure
1. Remove the cable from the black clip, remove one screw, and pry the AirPort antenna from the AirPort access door plate. This is shown with the display/analog assembly still attached to the front bezel, in a repair situation it would have to be removed.
2. Carefully position the computer so that the CRT faces you. Locate the metal antenna bracket at the top of the CRT. Remove the screw on the bracket, then pry the antenna cable from the clip on the side of the CRT.
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Antenna Board (eMac USB 2.0)
Microphone
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. Microphone eMac ATI Graphics/ USB 2.0/2005 Take Apart - 89
· Remove the Faraday plate. · Remove the digital assembly. · Remove the display/analog assembly.
Procedure
1. Carefully lift the display/analog assembly from the bezel to access the microphone. 2. Remove the microphone cable from the bezel.
90 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
Microphone
Door Assembly
Tools
This procedure requires the following tools: · Phillips #2
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the fan. Door Assembly eMac ATI Graphics/ USB 2.0/2005 Take Apart - 91
· Remove the Faraday plate. · Remove the digital assembly.
Procedure
1. Remove the two screws connecting the door to the front bezel. Remove the door from the front bezel.
2. Replacement Note: Transfer the serial number label on the inside of the door to the replacement door.
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Door Assembly
Memory
Tools
· No tools are required for this procedure
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Unplug all cables except the power cord, from the computer. · Remove the user access door.
Memory
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 93
Procedure
1. Touch a metal surface inside the computer. Then unplug the computer. Important: Always ground yourself before you touch any parts, or remove/install any components inside the computer. To avoid generating static electricity, do not walk around until you have finished removing or installing the memory and closed the computer.
94 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
Memory
2. Push the ejectors on the memory slot outward and down so they are in the open position. Remove the memory module. Replacement Note: The memory is designed to fit into the slot only one way. Be sure to align the notches on the module with the small notches inside the slot. Note: The RAM expansion modules used in the eMac (USB 2.0) computers are 184-pin SDRAM DIMMs (dual inline memory modules) that are 2.5 V, unbuffered, 8-byte, nonparity, and PC2700 compliant. The speed of the SDRAM devices must be rated at 167 MHz (7 ns) or faster. Refer to Kbase article 86718 for more information. Important: The memory expansion cards (DIMMs) in the eMac (USB 2.0) computers must use SDRAM devices as specified above. DIMMs for previous models of eMac or DIMMs that use EDO or SGRAM devices will not work. If they are installed, the computer will beep, and the power light will flash several times when you turn on the computer. This indicates that the computer cannot find any useable RAM.
Memory
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 95
Battery
Tools
· No tools are required for this procedure
Part Location
Note: The battery can be accessed through the user access door on the back of the computer.
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Unplug all cables except the power cord, from the computer. · Remove the user access door.
96 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
Battery
Procedure
1. Touch a metal surface inside the computer. Then unplug the computer. Important: Always do this before you touch any parts, or remove/install any components inside the computer. To avoid generating static electricity, do not walk around until you have finished removing or installing the battery and closed the computer.
2. WIth the nylon probe tool, carefully pry the battery out of the battery holder.
Battery
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 97
Modem (eMac ATI Graphics)
Tools
This procedure requires the following tools: · Phillips #1 or jeweler's screwdriver
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the Faraday plate.
98 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
Modem (eMac ATI Graphics)
Procedure
1. Remove the two modem screws and disconnect the RJ-11 cable from the modem.
2.
Lift the modem from the connector on the logic board.
Modem (eMac ATI Graphics)
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 99
Modem (eMac USB 2.0)
Tools
This procedure requires the following tools: · Phillips #1
Part Location
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT. · Remove the Faraday plate.
100 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
Modem (eMac USB 2.0)
Procedure
1. Disconnect the RJ-11 cable (#1) from the top of the modem. Remove the two modem screws (#2) and gently pry the board off its connector.The board is fragile; pry the board from the top and bottom.
Replacement Note: When replacing the modem, don't apply pressure to the middle of the board. The board should be pressed into place by holding the modem by the top and bottom.
Modem (eMac USB 2.0)
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 101
Display/Analog Assembly
Tools
This procedure requires the following tools: · No tools are required Warning: This product contains high voltage and a high-vacuum picture tube. To prevent injury, always review CRT Safety on Service Source online. This link can be found under the list of topics under the iMac icon. Remember, never use a grounding wriststrap until after discharging the CRT and setting up an ongoing ground connection. Note: The eMac (ATI Graphics) display/analog assembly requires no voltage calibration or geometry adjustment. Should the display require adjustment (color or brightness) use the "Displays" pane under System Preferences if using Mac OS X. If using Mac OS 9, use the Monitor Control Panel to make adjustments. If you can not make satisfactory corrections with these tools, replace the display/analog assembly.
Part Location
102 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
Display/Analog Assembly
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat · Remove the user access door · Remove the feet · Remove the rear housing · Discharge the CRT. · Remove the fan · Remove the Faraday plate · Remove the digital assembly · Remove the AirPort Extreme Card · Remove the front bezel · Remove the antenna. If you remove everything listed in the steps above, you are left with the display/analog module. There is nothing more to remove from this module. Note: The display/analog assembly contains a non-switching power supply which is preset at a 220V configuration.The voltage selection needs to be manually set by the way of a voltage jumper. This means if you are operating the computer in a 110V environment, you will have to install the voltage jumper. Refer to the Troubleshooting chapter, "Digital/ Analog" Replacement Note: If you are returning a defective display/analog module, it is imperative that proper packaging guidelines be followed. The packing procedure is included with the replacement assembly. Incorrect packaging can result in damaged eMac (ATI Graphics) displays. Please read and follow the directions enclosed in the shipping box of the new display prior to packaging the defective module. Failure to package the defective module according to the instructions may result in liability for the cost of the damaged display.
Display/Analog Assembly
eMac ATI Graphics/ USB 2.0/2005 Take Apart - 103
LHR Coil
Tools
This procedure requires the following tools: · Phillips #2 AirPort Extreme Card screwdriver
Part Location
Note: This part is used in Europe for line conditioning. If your computer does not have the LHR coil, skip this procedure.
Preliminary Steps
Before you begin, do the following: · Place the computer face down on an ESD mat. · Remove the user access door. · Remove the feet. · Remove the rear housing. · Discharge the CRT.
104 - eMac ATI Graphics/ USB 2.0/2005 Take Apart
LHR Coil
Procedure
1. Remove the screw located at the top of the LHR coil.
2. Disconnect the LHR connector located next to the fuse.
3. Lift the LHR coil from the display/analog frame. LHR Coil eMac ATI Graphics/ USB 2.0/2005 Take Apart - 105
Service Source
Troubleshooting
eMac ATI Graphics/USB 2.0/2005
© 2005 Apple Computer, Inc. All rights reserved.
General Information
What's New (May 2005)
eMac (2005)
· Revised logic board · 661-3539 1.42 GHz board: · New optical drives: · 661-3538, Combo, 32x · 661-3536, SuperDrive, 8x · New hard drives: · 661-3534, 80 GB · 661-3535, 160 GB · Memory, 333 MHz, DDR · 661-3540, 256 MB · 661-3541512 MB
What's New (April 2004)
eMac (USB 2.0)
Apple announced a revision to the eMac product family. Powered by G4 processors running at up to 1.25GHz, with a system bus of 167 MHz, the new eMac models come with Mac OS X v.10.3 and include Apple's iLife application suite, providing iMovie, iPhoto, and iTunes as a standard software configuration. The changes include the following: · No-optical drive configuration: This computer is available in a low-cost no-optical drive configuration · Mac OS X 10.3.3 · Modem: except for the educational configuration, the eMac (USB 2.0) has an internal, fax modem (soft modem). The modem appears to the system as a serial port that responds to AT commands. · Bluetooth (optional): Fully integrated Bluetooth is available as a build-to-order option · 922-6201 Bluetooth board · 922-6402 Bluetooth antenna · USB 2.0 ports: This computer has three USB 2.0 ports · Revised logic boards · 661-3279 1 GHz board: EEE code QDJ or QHL. · 661-3280 1.25 GHz board: EEE code QDK or QHM · New optical drives: · 661-3281, CD-ROM, 32x · 661-3282, Combo, 32x · 661-3283, SuperDrive, 8x General Information eMac ATI Graphics /USB 2.0/2005 Troubleshooting - 1
· New hard drives: · 661-3209, 80 GB · 661-3266, 160 GB (CTO) · Memory, 333 MHz, DDR · 661-3322, 512 MB
The RAM expansion modules used in the eMac (USB 2.0) computers are 184-pin SDRAM DIMMs (dual inline memory modules) that are 2.5 V, unbuffered, 8-byte, non-parity, and PC2700 compliant. The speed of the SDRAM devices must be rated at 167 MHz (7 ns) or faster.
Important: The memory expansion cards (DIMMs) must use SDRAM devices as specified above. DIMMs for previous models of eMac or DIMMs that use EDO or SGRAM devices will not work. If they are installed, the computer will beep, and the power light will flash several times when you turn on the computer. This indicates that the computer cannot find any useable RAM.
2 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting
General Information
· Faraday Shield · 922-6407 · Optical Plate (used on the no-optical drive configuration only) · 922-6408
General Information
eMac ATI Graphics /USB 2.0/2005 Troubleshooting - 3
· Inner AirPort Door (blank, used on the no-optical drive configuration only) · 922-6406 · Heatsink with/clip · 076-1079 · Wireless Antenna · 922-6401 · Wireless Antenna clips · 922-6405 · Kit, Feet, Captive Screws · 076-1034
4 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting
General Information
What's New (October 2003)
The eMac (ATI Graphics) computer was updated in October 2003. The changes include the following: · Revised logic board, part number 661-3014, 1 GHz, Ver. 2 (EEE code Q11) The EEE code/barcode location is shown below.
· New optical drives: · 661-3012, CD-ROM, 32x, drive · 661-3015, Combo, 32x, drive · 661-3013, SuperDrive, 4x · New hard drives: · 661-3011, 80 GB · 661-3016, 160 GB (CTO) · Mac OS X 10.3 · Updated Apple and third-party bundled software
General Information
eMac ATI Graphics /USB 2.0/2005 Troubleshooting - 5
What's New (May 2003)
eMac (ATI Graphics)
1. To quickly identify the eMac (ATI Graphics) computer from t he original eMac, look at the user access door on the back of the computer. The user access door on the eMac (ATI Graphics) computer is white. The original eMac has a silver user access door. 2. There are two new logic boards with faster processors: 661-2854 (1GHZ) with EEE code NMA and the 661-2853 (800 MHz). 3. The eMac (ATI Graphics) uses the AirPort Extreme Card for wireless networking. The original AirPort card can not be used in this computer. Previous models of eMac used the original AirPort card. For compatibility information, see AppleCare Knowledge Base article 107440: AirPort Extreme Card: Compatible Macintosh Computers. 4. Note: The AirPort Extreme Card can not be used under Mac OS 9. 5. The PMU reset button is in a new location. Refer to the topic, "The PMU Chip" or "How to Reset the PMU on the Logic Board" in this chapter. 6. The digital module assembly has been redesigned allowing easier removal and access to the optical drive without removing the digital module. 7. The heatsink has been redesigned. 8. The voltage jumper and LHR jumper are in new locations on the digital/analog assembly. Refer to "Display/Analog Voltage Setting and LHR Module Instructions" in this chapter for more information. 9. The hard drive carrier has one thermal pad and two rubber bumpers on the top side of the carrier. On the underside of the carrier there are two EMI pads. If you replace the carrier, these pieces come with the replacement carrier and need to be attached before inserting the hard drive. 10. The power button of the eMac (ATI Graphics) replaces the power reset button and programmer's switch (NMI button, also known as a NMI or nonmaskable interrupt button). You can use the power button for the following functions: Sleep
Press the power button for 1 second to put the computer to sleep. To wake the computer from sleep, press the power button for less than one second or press any key on the keyboard.
Shut down
To shut down the computer, select Shut Down from the Apple menu (Mac OS X) or from the Special menu (Mac OS 9). You will be prompted to save any unsaved documents. If the computer is unresponsive, you can force the computer to shut down by pressing the power button and holding it for at least 5 seconds. Important: Information in any unsaved documents may be lost.
Firmware updates
From time to time, Apple has provided firmware updates to address certain issues that
6 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting General Information
cannot be addressed in updates to software. On earlier computers, the programmer's switch was used to install a firmware update. Follow these steps in the event that a firmware update is needed for these computers: 1. Shut down the computer. 2. Wait until the computer is shut down and the power button light is off. 3. Press and hold the power button for several seconds. 4. The computer will signal that a firmware update is ready to be installed by a making a steady tone and the power button light will quickly flash several times for several seconds.
What's Important
1. Important: The display/analog (service module) contains a non-switching power supply which is preset at a 220V configuration. The voltage selection is manually set by way of a voltage jumper. This means if you are replacing the display/analog assembly and you will be operating the computer in a 110V environment, you will have to install the voltage jumper on the replacement module. Refer to the inbox instruction included with the display/analog service module, or refer to "Display/Analog Voltage Setting and LHR Module Instructions" discussed later in this chapter. Note: The LHR coil (line conditioning module) is used in some international countries. Refer to the Take Apart chapter, LHR topic, for take-apart information. 2. Important: If you are returning a defective display/analog assembly, it is imperative that proper packaging guidelines be followed. The packing procedure is included with the replacement assembly. Incorrect packaging can result in damaged eMac displays. Please read and follow the directions enclosed in the shipping box of the new display prior to packaging the defective module.Failure to package the defective module according to the instructions may result in liability for the cost of the damaged display. 3. Important: Do NOT lift, handle, bump, or manipulate the CRT neck/neck board on the Display/Analog assembly. Modules damaged by mishandling are NOT covered by Apple Warranty. Apple Authorized Service Providers can be liable for broken CRT necks due to improper handling. Refer to "CRT Neck/ Display/Analog Assembly Handling Information" topic in this chapter for more information. 4. The eMac (ATI Graphics) display/analog assembly requires no voltage calibration or geometry adjustment. Should the display appear to require adjustment (color or brightness) use the "Displays" pane under System Preferences if using Mac OS X. If using Mac OS 9, use the Monitor Control Panel. If you can not make satisfactory corrections with these tools, replace the display/analog assembly. 5. Important: The microprocessor uses a heatsink/thermal pipe to transfer heat away. Whenever the heatsink is removed, the bottom side of the heatsink and the top of the microprocessor must be cleaned and thermal paste must be applied to the microprocessor. If the mating surfaces are not cleaned and thermal paste is not applied, the CPU may overheat and become damaged. Refer to "Thermal Paste Application" in this chapter.
General Information
eMac ATI Graphics /USB 2.0/2005 Troubleshooting - 7
Logic Board, eMac (ATI Graphics), Top Side
Sound Output Port Microphone Connector Fan Power Connector LED Connector Speaker Connector
Sound Input Port USB Ports FireWire Ports RJ-11 (Modem Not Shown) Ethernet Port Video Output Port Power Button Connector Video Connector
Battery
Optical Connector
SDRAM Memory Slots
PMU
8 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting
General Information
Logic Board, eMac (ATI Graphics), Bottom Side
Video Processor
Hard Drive Connector
AirPort Extreme Connector
Blind Mate Connector
G4 Microprocessor
General Information
eMac ATI Graphics /USB 2.0/2005 Troubleshooting - 9
Logic Board, eMac (USB 2.0), Top Side
The yellow rectangle below show the location of the board's serial number. Embedded within the serial number is the EEE code for the board. The 1 GHz board has a EEE code of either QDJ or QHL and the 1.25 GHz board has a EEE code of QDK or QHM.
10 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting
General Information
Logic Board, eMac (USB 2.0), Bottom Side
General Information
eMac ATI Graphics /USB 2.0/2005 Troubleshooting - 11
I/O Ports
The ports listed from left to right are: · Headphone · Sound out port · USB ports (3) · FireWire ports (2) · Modem · Ethernet · Video out port
12 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting
General Information
The PMU Chip
The PMU (Power Management Unit) is a micro controller chip that controls all power functions for the computer. The PMU is a computer within a computer. It has memory, software, firmware, I/O, two crystals, and a CPU. Its function is to: · Tell the computer to turn on, turn off, sleep, wake, idle, etc. · Manage system resets from various commands. · Maintain parameter RAM (PRAM). · Manage the real-time clock.
Important: The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the PMU crashes, the battery life goes from about five years to about two days if the PMU is not reset. Refer to the next topic, "How to Reset the PMU on the Logic Board" for the procedure.
Many system problems can be resolved by resetting the PMU chip. The PMU reset button is located behind the user access door, refer to the graphic below.
Location of the PMU Reset Button on the eMac (ATI Graphics)
General Information
eMac ATI Graphics /USB 2.0/2005 Troubleshooting - 13
How to Reset the PMU on the Logic Board
Resetting the PMU (Power Management Unit) on the logic board can resolve many system problems. Note: Whenever you have a unit that fails to power up, follow this procedure, starting with step 3, before replacing any modules.
1. Save open documents and quit all open applications. 2. Turn the computer off by choosing Shut Down from the Special menu (if using Mac OS 9), or choose Shut Down from the Apple menu if using OS X. 3. Unplug all cables, except the power cord, from the computer.
14 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting
General Information
4. Place the computer face down on an ESD matt or soft cloth. Remove the user access door screw.
5
Touch the metal surface inside the computer. Important: Always ground yourself by touching metal before you touch any parts or install components inside the computer. To avoid generating static electricity, do not walk around the room until you have finished the procedure and closed the computer
General Information
eMac ATI Graphics /USB 2.0/2005 Troubleshooting - 15
6
Unplug the power cord. Remember, to avoid generating static electricity, do not walk around the room until you have finished the procedure and closed the computer
7
Press the PMU reset button (circled below) once and then proceed to step 8. Do NOT press the PMU reset button a second time because it could crash the PMU chip.
8
WAIT ten seconds before connecting the power cord and powering the computer on. If the computer powers on, go to the next step. If the computer does not power on, there is something else wrong with the computer, refer to the symptom/cure, "No Power" in this chapter. Run Apple Service Diagnostics and then return the computer to the customer.
9
Note: This entire procedure resets the computer's PRAM. Be sure to reset the computer's time, date and other system parameter settings before returning the computer to the customer.
16 - eMac ATI Graphics/USB 2.0/2005 Troubleshooting
General Information
Power-On Self Test
There is a power-on self test that resides in the ROM of the eMac. This test automatically runs whenever the eMac is powered on after being fully shut down (the power-on self test does not run if the machine is only restarted). If a problem is detected during the test, you will not hear a normal startup chime. Instead, the system will beep as explained below. Refer to "Error Beeps" later in this chapter for instructions on how to troubleshoot and repair an eMac that sounds error beeps at startup time. Following is a definition of what the error beeps at startup time signify.
One Beep: No RAM is installed or detected. Two Beeps: Incompatible memory is installed. (The slots accept standard PC-100 or PC-133, 168-pin DIMMs). Three Beeps: No RAM banks passed memory testing. Four or Five Beeps: Bad checksum for the remainder of the boot ROM. The ROM is bad.
General Information
eMac ATI Graphics /USB 2.0/2005 Troubleshooting - 17
Logic Board Battery
Important: Apple highly recommends removing the battery when handling the logic board. Make sure to use proper ESD protection when handling modules.
The battery on the logic board controls the stored system settings, such as date and time. It is only necessary to test the battery when you can't power on the computer, or the date and time are reset every time the AC power is removed. The battery is also used to power the PMU chip (because the PMU chip keeps time and must always be running) when the computer is unplugged from the wall (AC power). The PMU is very sensitive and touching any circuitry that is connected to the PMU can cause it to crash. If the PMU crashes, the battery life goes from about five years to about two days if the PMU is not reset. Once the battery goes dead, the PMU will reset the time and date every time the AC power is removed. To fix this situation, replace the battery and reset the PMU (refer to "How to Reset the PMU on the Logic Board" mentioned earlier in this chapter).
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General Information
Testing the Battery
If the computer has a "No Power" situation, check the battery before replacing modules. A drained battery may be indicative of a crashed Power Management Unit. With the battery in the battery holder (under load), measure the voltage across the battery's positive and ground terminals.
Does the battery measure at least +3.5v? If not, replace the battery and reset the PMU. If the battery does measure over +3.5v, reinstall the battery and reset the PMU as above Connect the power cord and power up the system again.
General Information
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Display/Analog Voltage Setting and LHR Module Instructions
The display/analog (service module) contains a non-switching power supply which is preset at a 220V configuration. The voltage selection is manually set by way of a voltage jumper. This means if you are replacing the display/analog assembly and you will be operating the computer in a 110V environment, you will have to install the voltage jumper on the module. The following instructions explain how to configure the voltage and LHR jumpers on the digital/analog assembly. Note: The LHR coil (a line conditioning module) is required in some international countries. Refer to Table 1 for jumper settings and the following photos for jumper and LHR locations.
Tools
This procedure requires the following tools: · needlenose pliers to remove/attach the voltage jumper · phillips #2 screwdriver if attaching the LHR module
Table 1: Jumper Settings Voltage Environment 110 V 220 V no LHR module 220 V with LHR module Voltage Jumper Setting Jumper is on Jumper is off Jumper is off LHR Jumper Setting Jumper is on Jumper is on Jumper is off, LHR module installed
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General Information
Procedure
1. Locate the voltage jumper circled below. Note: This jumper won't be installed on a 220V computer.
2. Next, refer to Table 1 (on the previous page) for the voltage jumper setting and set the jumper accordingly. Warning: Be careful around the CRT. Discharge the CRT before removing or replacing the jumper. 3. Locate the LHR coil jumper circled below. Then refer to Table 1 for the LHR jumper setting and set the jumper accordingly.
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4. Identify if you have the LHR coil (shown below) on the computer. Note: The LHR coil (a line conditioning module) is required in some international countries.
5.
If you don't have an LHR module, install the replacement display/analog assembly and ensure the jumpers are set correctly. If you have an LHR, go on to step 6.
6. If you have an LHR coil, remove the LHR from the faulty display/analog assembly, place the LHR on the replacement digital/analog assembly, and set the jumpers according to Table 1.
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General Information
Thermal Paste Application
The microprocessor uses a heatsink/thermal pipe to transfer heat away. Whenever the heatsink is removed, the bottom side of the heatsink and the top of the microprocessor must be cleaned and thermal paste must be applied. If the mating surfaces are not cleaned and thermal paste is not applied, the CPU may overheat and become damaged.
Tools
This procedure requires the following tools: · Plastic stylus or nylon probe tool (922-5065) to remove the old thermal paste · Thermal paste (922-4757), each tube contains 4-5 applications
Procedure
1. Thoroughly clean the thermal film from the heatsink surface with a plastic stylus or the nylon probe tool. Do not use an abrasive material or liquid cleaner. Important: Be extremely careful not to bend the fins on the heatsink.
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2. Carefully clean the surface of the microprocessor with a plastic stylus or nylon pr