Power Supply Board

Ikwarning This product contains high voltage and a high-vacuum picture tube. To prevent serious injury, review CRT safety in Bulletins Safety. Note There are two versions of the power supply board. Identify which version you have before replacing a module. Exchange like-for-like. Refer to the Service Parts database or the wiring diagrams for the Rev. 2 analog video and power supply boards located in the Exploded View Chapter. The Rev.2 power supply board is not backwards compatible and must be...

Testing for Power

The iMac requires trickle voltage (+5 TRKL) in order to poweron. If you are experiencing power problems in the iMac unit, you will want to test for trickle power at various points in the system to pinpoint the location of the problem and to determine whether or not the power supply is functioning normally. If you have trickle power in the system, the odds are your power supply is OK. In general, you should test for power at the AC outlet first. Next, it is best to start at the end (in this...

Gray Screen Raster

In a Gray Screen Raster situation, you will get a normal startup boot chime, the system will have a green startup LED, and the fan will be running. The display, however, will have a solid gray screen with no cursor or desktop displayed. Reset parameter RAM. Hold down < Command> < Option> < P> < R> during startup but before Welcome to Macintosh appears. Boot off the system CD that came with the unit. Do you see a normal screen display now Yes Reinstall system software. (You must...

Installing a Microphone Gasket

Installing the microphone gasket (922-3679) will improve audio recording quality from the internal microphone on some early production iMac computers. Refer to TIL article 58053 for additional information. Before you begin, remove the following 1 Place the gasket around the microphone opening in a vertical orientation. Ensure that the microphone opening is not obstructed by the gasket. 2 Replace the front outer bezel, taking care not to dislodge the gasket. 3 Replace the two front bezel screws....

Analog Video Board

Ikwarning This product contains high voltage and a Analog high-vacuum picture tube. Beard To prevent serious injury, review CRT safety in Bulletins Safety. Note There are two versions of the analog video board. Identify which version you have before video replacing a module. Board Exchange like-for-like. Refer to the Service Parts Database and the wiring diagrams for the analog video and power supply boards located in the Exploded View chapter. The Rev. 2 board is not backwards compatible and...

The Cuda Chip

Its function is to Turn system power on and off Manage system resets from various commands Maintain parameter RAM PRAM Many system problems can be resolved by resetting the Cuda chip see the Symptom Cure tables for examples . Press the Cuda reset button on the logic board to reset the Cuda chip. The Cuda reset button is located on the back edge of the logic board between the modem port and the processor module. Refer to the Logic Board Diagram in the Basics...

Testing Your Hard Disk for Physical Damage

Note Testing the disk can take two hours or more, depending on the size of your disk. 1 Start up your computer from the software install CD. See Chapter 3, Starting Up From a CD, on page 45. 2 Locate the Drive Setup icon and double-click it to open the Drive Setup program. 3 In the list of drives, click the disk you want to test. 4 From the Functions menu, choose Test Disk. 5 When a message tells you that the testing is complete, click Quit. If the test reveals a problem, the hard disk may be...

Serial Number and Ethernet Address

The serial number and Ethernet hardware address are located on the inside panel of the I O door. Replacement logic boards ship with an Ethernet label. If you replace the logic board, you must affix the new label over the existing Ethernet label located on the I O panel above the serial number. IMPORTANT Do NOT cover up the serial number information that is printed on the existing label.

Performing a Clean Installation

This section provides instructions for what is commonly called a clean installation of system software. Performing a clean installation is more complicated than a standard installation, but it is sometimes the best way to solve a persistent problem. A clean installation gives you a fresh start with system software. When you install system software using a clean installation, the Installer creates a new System Folder on your hard disk. The old System Folder is renamed Previous System Folder....

Rev Service Parts

Listed below are the Rev. 2 iMac service parts. Exchange or replace the Rev. 2 parts like-for-like. The Rev. 2 parts are not backwards compatible. Identify the part correctly before replacing a module or replacement part. Refer to the Service Parts database, the Exploded View chapter, and the Take Apart chapter for additional information. 661-2166 Analog Video Board, Rev.2 661-2167 Power Supply Board, Rev.2 922-3835 Grounding Wire, CRT, Rev.2 922-3836 Audio Cable, Rev. 2 922-3842 Video Cable,...

Infrared Communication

The iMac models M6709LL A and M6709LL B come with built-in 1-megabit infrared technology for easy, wireless LAN access and file sharing with similarly equipped systems. The iMac logic board has one IrDA Infrared Data Association compliant connector that offers a maximum transfer speed of 4 MB sec AppleTalk and TCP IP . The iMac also allows users to switch to the IRTalk protocol by using the Infrared Control Panel. The iMac can therefore communicate with other IRTalk-capable devices such as...

Logic Board

Imac Logic Board Ids

Before you begin, remove the following Logic board mass storage chassis Note For Mac logic board identification, reference the product ID label. Logic board 661-2113 has a product ID label that contains the characters EQD. 661-2061 contains the letters CVK, ELO, or EPU. Modules should be exchanged like-for-like. Disconnect all the cables on the logic board. Remove the five screws that secure the logic board to the chassis. Remove the two flathead screws that secure the I O panel to the chassis....

External Displays Not Supported

Connecting an external display to the iMac is not supported by Apple and will void the iMac warranty. The db-15 port on the iMac was not designed to support an external monitor. Apple designed iMac with a very sharp, 15-inch internal display and no video-out port to connect a second display. Refer to Tech Info Library TIL article 43016, iMac Can I Attach an External Display for more information. CD-ROM vibration is typically caused by unbalanced CDs when spinning at higher speeds in the...

Display Adjustment Utility v Read Me File

Use the Display Adjustment Utility to adjust the geometry, brightness, contrast, and color of Power Macintosh G3 All-in-one and iMac displays. The utility is designed to run under Mac OS 8.1 or greater. The utility can be found online http service.info.apple.com by selecting Service Diagnostics from the Technical Resources pull-down menu. Note When running this utility, QuickTime v2.5 or later extension and QuickTime PowerPlug v2.5 or later extension must be enabled.

Processor Shield Frame

Before you begin, remove the following Logic board mass storage chassis 1 Remove the one screw that holds the shield frame to the logic board. 2 Unhook the tabs that attach the shield frame to the logic board. This may require jiggling the shield frame back and forth to unhook the tabs. Note Remove the processor shield frame, the processor top shield, the processor card, the modem, and modem standoff before returning the logic board to Apple. Before you begin, remove the following Logic board...

Testing the Modem

The iMac ships with ClarisWorks a.k.a. AppleWorks software, which can be used to test the iMac modem connection. You should run this test if the modem is not able to dial out. To perform this test 1. Locate and launch ClarisWorks. Version 5.0 ships with the iMac computer. 2. From the ClarisWorks New Document window, select Communications and click OK. You will be presented with an untitled communications document. 3. Click on the settings menu item and select Connection from the menu, which...

CDROM Not Showing on Desktop Cant Open CD

CD-ROM problems are defined by the inability to see the CD disc on the desktop or to open a CD disc that is loaded into the drive. Note a certain amount of CD-ROM drive vibration is normal. If the drive is vibrating loudly use the iMac CD Update v.10 to update the firmware on your CD-ROM drive. Refer to the following symptom CD-ROM Vibration for additional information. Try using a known-good compact disc. If the CD-ROM drive fails to mount, boot off the system CD that came with the unit. Do you...

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. The R77 light meter is capable of reading luminance from 10 to 1,000 footcandles fc . Before you begin, remove the 10X multiplier plate from the lens. Three scales are shown on the light meter Because display screen luminance typically ranges from 10 to 50 fc, take readings from the bottom scale only. To measure a display screen's luminance, 1 Set the...

White Balance

Note Make sure the cutoff is set correctly before you proceed and that the monitor has been on for at least 10 minutes. 1 Run the Display Service Utility's Gray Bar test pattern. Display Adjustment Utility Fi Display Adjustment Utility Fi 2 Hold a light meter on the white bar last bar on the right . Adjust the red, green, and blue drive controls until the light meter reads one of the following 18 foot candles on light meter R77 18 foot candles on light meter L246 Middle of 9 on the 1 through 10...

If this doesnt solve your problem return toProblems on page Rebless the System Folder

If your computer is not recognizing the system software, the System Folder may need to be re-blessed. This helps the computer recognize which System Folder to use. 1 Start up your computer from the software install CD. See Chapter 3, Starting Up From a CD. 3 Double-click the System suitcase. 4 After the System suitcase opens, close the suitcase and System Folder windows and restart your computer. If this doesn't work, then try the following 1 Drag the System suitcase and Finder out of the...

Colored Service Parts Matrix

Bondi Blue

922-3563 Bondi Blue 922-3784 Grape 922-3786 Lime 922-3783 Strawberry 922-3785 Tangerine 922-3774 Blueberry 922-3740 Blueberry 922-3564 Bondi Blue 922-3788 Grape 922-3790 Lime 922-3787 Strawberry 922-3789 Tangerine with IrDA 922-3605 Bondi Blue 922-3776 Blueberry 922-3796 Grape 922-3798 Lime 922-3795 Strawberry 922-3797 Tangerine 922-3559 Bondi Blue 922-3728 Blueberry 922-3800 Grape 922-3802 Lime 922-3799 Strawberry 922-3801 Tangerine 922-3560 Bondi Blue 922-3727 Blueberry 922-3804 Grape...

Reset the PRAM

Your computer stores information in an area of memory called parameter RAM PRAM . Resetting the PRAM replaces the information stored there with the default original settings. Important Some system preferences are stored in PRAM. Third-party software programs may also store information in PRAM. When you reset the PRAM, some of these preferences are lost. Make sure you make a note of the settings before you reset PRAM. Resetting PRAM may affect the settings in some of your control panels,...

Logic Board Mass Storage Chassis Exploded View

Modems Explored View

CD-ROM Drive 661-2076 Note the bezel is a separate part Bezel, CD refer to Colored Service Parts Matrix Exploded View SDRAM,SO-DIMM 661-2079, 32 MB 661-2195, 64MB Processor Card 661-2165, 266 MHz 661-2193, 233MHz, Rev. 3 Logic Board 661-2061 661-2113, Ver. 2 CD-ROM Drive 661-2076 Note the bezel is a separate part Processor Card 661-2165, 266 MHz 661-2193, 233MHz, Rev. 3 Logic Board 661-2061 661-2113, Ver. 2

Problems With Hard Disks CDs and Other Storage Media Problems With Hard Disks

Only one document called Where have all my files gone appears on the hard disk. If no files appear on the hard disk except for a single document called Where have all my files gone , you started up your computer from a CD with system software earlier than Mac OS 8.1. To see the contents of your disk, you must start up your computer from a disk with Mac OS 8.1 or later . Can't mount Mac OS, DOS, or ProDOS partitions. Use PC Exchange to mount these partitions as individual volumes on the desktop....

Startup Problems Before Finder

If you have trouble starting up the iMac, and the problem occurs before the Finder appears on the screen, you may have either a software or a hardware problem. Following are troubleshooting tables with problem symptoms that you may see before the Finder appears. Possible causes for each symptom can be found in the left-hand column with the corresponding fixes in the right-hand column. The troubleshooting information is presented in the order of the most probable cause and fix therefore, Apple...

Increase the memory available for system software

If you're having trouble starting up your computer, there may not be enough memory to load all the system software extensions you've installed. Restart the computer, holding down the Shift key until you see the message Extensions Disabled in the Welcome to Mac OS box. Turn on or increase virtual memory in the Memory control panel. Your computer will perform well with virtual memory set to no more than twice the amount of RAM in the computer for best performance, limit virtual memory to 1.5...

Make sure youre using the correct disk as a startup disk

At least one disk drive must have system software on it from which the computer can start up. Most computers have an internal hard disk that is used as the startup disk. You can also use the software install CD to start up your computer. Make sure the correct disk is selected in the Startup Disk control panel. If your computer is trying to start up from a CD that is not a startup CD it has no system software on it , press the Open button on your CD-ROM drive, carefully pull out the tray, and...

Resetting the Cdrom Eject Mechanism

Open Mac Mini Paperclip

After manually ejecting CDs from the Mac CD-ROM tray of both A and B models , the eject mechanism sometimes does not reset into a position that allows the tray door to close properly. Instead of replacing the CD-ROM assembly, the eject mechanism can be manually reset with a paperclip to correct the problem. 1 Position the Mac on its side. 2 Insert a paperclip into the manual eject hole on the front of the CD-ROM tray door to open the tray. Note The manual eject mechanism is accessed from the...

Cursor Problems A

The first section A of this table deals with a cursor that does not move on the screen however, the keyboard is working and accepting commands. See Cursor Problems B for additional troubleshooting information. Verify that the mouse is connected securely to the USB keyboard. Inspect inside of mouse for buildup of dirt or other contaminants. Clean mouse if necessary. If the mouse is connected to the keyboard, connect the mouse to one of the USB ports inside the iMac I O panel instead. Does the...

Quit open applications

When you restart your computer, the computer tries to quit all open applications. Sometimes an application doesn't get the message to quit and you have to quit the application yourself. Important Before quitting an application, make sure you save any open documents. You can quit almost any application by choosing Quit from the File menu or pressing Command X -Q. If this doesn't work, you can sometimes force a program to quit by simultaneously pressing the keys Command x , Option, and Esc. Then...

Imac No Power To Keyboard

In a No Power situation, the system is completely dead. There is no LED, no fan, no hard drive power, and the screen is completely black. Refer to Testing for Power earlier in this chapter for instructions on how to test for power at each component referenced in this procedure. Bad power cord, connection, or outlet. - Verify the power outlet is good. - Try a known-good power cord to determine if the existing power cord could be the problem. Make sure the power cord is connected securely at both...

Initializing a Hard Disk

The hard disk inside your computer was initialized formatted for use at the factory, so you should need to initialize it only if your hard disk is damaged and can't be repaired with Disk First Aid or another disk repair program . You can initialize your internal hard disk using a program called Drive Setup, which is on the software install CD that came with your computer. Warning Initializing a disk erases all information on the disk. Before initializing your disk, recover all the information...

No or Unstable Raster

In a No or Unstable Raster situation, the screen is either completely black, or you will see horizontal rolling lines, rescan lines, or the vertical horizontal lines won't hold indicating a sync problem . There will be power to the system, however, which is evidenced by an illuminated amber LED, a running fan, etc. You will not hear any error beeps at startup with a No Raster problem. If you do hear error beeps, you should follow the Error Beeps troubleshooting scenario. Reset parameter RAM....

Power Supply Board Fuse

There is a fuse on the AC line on the iMac power supply board. The fuse is located at F901 near the bottom right corner of the installed power supply board as you are facing the back side of the board . This fuse is an orderable service part and can be replaced by Service Providers. The fuse is included in the No Power section of the Troubleshooting chapter as a module to check if power problems occur in the system. Instructions for how to test the fuse are included in the Testing for Power...

HFS Formatted Drives

The hard drive in the iMac is formatted with HFS also referred to as Mac OS Extended format . It is important to note that Norton Utilities version 3.5 is not compatible with HFS or Mac OS Extended format , and in fact, can destroy data on the hard drive. Norton Utilities version 3.5.3 or 3.5.2 will not attempt to repair a drive formatted with Mac OS Extended format and versions 3.5.1 and earlier cannot recognize that a hard drive is in Mac OS Extended format and can result in hard drive...

Modem Performance Issues

This table should help you troubleshoot issues with the speed or response time of the modem. The table is divided into different sections, each with its own symptom and cure s . Find your symptom and then follow the instructions under the Possible Fix column to resolve the problem. Slow Response If the user has connected to the online service and is experiencing very slow response to their actions or when accessing sites, refer to this section of the table. Too many people are using the ISP's...

IrDA Problems

Imac Usb Not Working

IrDA problems refer to the inability of two infrared-equipped units to communicate via their infrared communication panels to transfer data or commands. Clean infrared window with soft lint-free cloth. Infrared units are too close or too far apart. - Make sure units are spaced greater than 3 feet but less than 6 feet and at less than a 20 degree angle. - Verify infrared signal is being received by host computer. IrDA control panel is set incorrectly. Open the IrDA control panel and make sure...

Sound In Problems

Sound in problems involve the internal microphone. Symptoms could be audio recording quality is poor, a high level of background noise is noticeable, or no sound is recorded. Open the Simple Sound Control Panel found under the Apple Menu . Select CD Quality under the Sound menu to minimize noise on the internal microphone. Did this solve the problem Yes If the initial sound in problem was with the sound control panel, the problem is solved. No Go to next step. Reseat the 5-connector audio...

IMac Screw Matrix

Can to CRT Chassis w lock washer 2 Can Cable Clip w lock washer 1 922-3638 w washer Logic Board 5 HDCarrier to Can 2 Interconnect Board Shield toCan 1 Cable Bracket to Can 1 Bottom Housing 4 Front outer Bezel 2 Top Rear Housing 2 CRT chassis to Inner Bezel 4 CRT to CRT Chassis to Inner Bezel 4 8 4 8 2 8 I I I I I I I 8 4 8 2 8 I I I I I I I V 8 4 8 2 8 I I I I. I I. I I .T. I. I I 0 8 4 8 2 8 4 I. I I I. I I. I I .T. I. I I. I I Speakers 1 ea, Fan 2 Headphone Board 2 Power Supply Board 3 Analog...

Network Problems

Refer to this troubleshooting table if you are unable to switch to the Ethernet network option in the control panel or if you are unable to see any network devices. Note if you are able to see most network devices, but one particular device does not show up in the Chooser, troubleshoot the device in question. You most likely do not have a network problem. Wrong option selected in the control panel. Open the Network control panel and select the Ethernet option. Are you able to select the...

Cutoff

Shades Black Color

Note Perform the cutoff adjustment prior to adjusting the white balance. Make sure the monitor has been on for at least 10 minutes. 1 Using the Monitors amp Sound Control Panel, set the contrast to maximum and brightness to midrange. 2 Set the display resolution is set to 640 x 480. -Display Adjustment Utility H -Display Adjustment Utility H Adjustment Utility, Color window, move the Sub Contrast and Sub Brightness controls to midrange. Important The Display Adjustment Utility requires that...

Sound Out Problems

Sound out problems refer to a lack of sound coming from the internal speakers located on the front of the unit directly below the display , external speakers connected via the I O panel to the speaker connector on the logic board , or both. First, disconnect any external microphones, speakers or headphones. Next, Verify that volume setting in Control Panel is adequate and that mute is not checked. Test the for sound coming from the internal speakers. Do you have sound now Yes If the initial...