Apple iMac 233 266 333MHz Service Manual
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iMac
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Hot Issues
iMac
Hot Issues Introduction - 1
Introduction
This chapter is designed to highlight unique or highpriority product issues that you should be aware of before
servicing the iMac computer.
This chapter alerts you to important issues and provides
pointers to other areas in the manual where more complete
information can be found. This chapter is not intended to
replace other parts of this manual; it merely provides a
pointer to pertinent information in those chapters.
To familiarize yourself with a new product family, always
read the Basics chapter in its entirety. You should also refer
to the Troubleshooting chapter for basic theory of operations
information.
Hot Issues Mixed Memory Types - 2
Mixed Memory Types
The iMac computer uses SDRAM SO-DIMMs only; EDO
memory will not work in the iMac computer. System
problems will result if EDO memory is installed. (See
“SDRAM DIMMs” in the Basics chapter and refer to the iMac
section of the Memory Guide.)
Customers are allowed to upgrade the memory in
Note:
iMac computers and may inadvertently mix EDO and SDRAM
memory. If incompatible memory types are installed, you
will hear two beeps upon startup. (See “Power-On Self
Test” in Troubleshooting for more information.)
Hot Issues Mixed Memory Types - 3
SGRAM Video Memory
The iMac computers use SGRAM video memory. Use only
SGRAM SO-DIMMs in these machines. Never install the
256K or 512K video memory DIMMs used in older
Macintosh computers. (See “SGRAM Video Memory” in the
Basics chapter.)
Error Beeps
If problems are detected upon startup, the iMac system will
sound one or more error beeps. (See “Error Beeps” in the
Troubleshooting chapter.)
Hot Issues HFS Plus Formatted Drives - 4
HFS Plus Formatted Drives
The iMac hard drive is formatted from the factory with Mac
OS Extended format, also referred to as HFS Plus. Norton
Utilities version 3.5 is not compatible with HFS Plus and
version 3.5.1 and earlier can result in hard drive
corruption and loss of all data on the hard drive. (See “HFS
Plus Formatted Drives” in the Troubleshooting chapter.)
Hot Issues Forcing a Restart - 5
Forcing a Restart
If holding down the Command, Control, and Power keys fails
to restart the iMac computer after a system hang, you can
force a restart in one of two ways:
First, try inserting a straightened paper clip in the reset
button hole. (Open the I/O door on the side of the iMac. The
reset button hole is the top hole located between the Ethernet
and modem ports and marked with a triangle symbol.)
If the reset button method doesn’t work, try the following:
1. Unplug the power cord.
2. Wait at least 30 seconds and then reconnect the power
cord.
3. Restart the iMac by pressing the power button on either
the keyboard or the front of the computer.
Hot Issues External Displays Not Supported - 6
External Displays Not Supported
Connecting an external display to the iMac is not supported by
Apple. 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.
Hot Issues iMac Updates - 7
iMac Updates
Apple has released a number of updates for the iMac. Refer to
TIL article #58174, iMac: When to Install Available
Updaters. This TIL article will clarify when to use the
available updates depending upon which version of iMac you
have.
Additional iMac Update articles:
• TIL article # 26115, CD Firmware Update 1.0
The CD Firmware Update reduces the amount of vibration
caused by certain CDs in the internal CD-ROM drive.
• TIL article #44005, iMac Update 1.0 Software
Apple made improvements to its Universal Serial Bus
(USB) software.
• TIL article # 58178, About iMac Update 1.1
Apple made additional improvements to its USB software.
The iMac Update 1.1 includes these new improvements
Hot Issues iMac Updates - 8
and those previously released in iMac Update 1.0. This
update improves the ability of iMac to identify USB
devices when starting up, improves the startup time
when many USB devices are connected, and enables new
USB solutions. You do not have to install iMac Update 1.0
before you install iMac Update 1.1.
• TIL article # 58370, iMac: How to Ensure Firmware
Update is Successful
If you performed the iMac firmware update and it was not
successful, this article provides some additional
assistance ensuring the update is successful.
Hot Issues CD-ROM Door Not Latching Closed - 9
CD-ROM Door Not Latching Closed
After manually ejecting CDs from the iMac 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. Refer to “Resetting CD-ROM Eject
Mechanism” in Additional Procedures.
Hot Issues Revision vs. Version Part Numbers - 10
Revision vs. Version Part Numbers
Moving forward, the Service Parts database will identify
service parts (upgrades, changes, or variations) with the
word Rev. (Revision) or Ver. (Version) appended to the part
name.
For example:
661-2193 Card, Processor, 333 MHz, Rev. 3
661-2113 Board, Logic, iMac, Ver. 2
• Revision (Rev.)= A change or upgrade to the part. The
new Rev. is backward compatible and will eventually
replace the earlier part number.
• Version (Ver.)= A different variation of a similarly
functional part. The versions are not interchangeable.
Hot Issues Version 2 Service Parts - 11
Version 2 Service Parts
Listed below are the Ver. 2 iMac service parts. Exchange or
replace the Ver. 2 parts like-for-like, they are not
backward compatible. Identify the part correctly before
replacing a module or replacement part. Refer to the Service
Parts database for additional information.
• 661-2166 Analog/Video Board, Ver. 2
• 661-2167 Power Supply Board, Ver. 2
• 922-3835 Grounding Wire, CRT, Ver. 2
• 922-3836 Audio Cable, Ver. 2
• 922-3842 Video Cable, RGB, Ver. 2
• 922-3837 CRT Bottom Frame, Ver. 2
• 922-3838 CRT, Northern Hemisphere, Ver. 2
• 922-3839 CRT, Southern Hemisphere, Ver. 2
• 922-3840 CRT, Equatorial, Ver. 2
• 922-3841 Fan, 92mm, Ver. 2
Hot Issues New CD-ROM Drive Released (7/99) - 12
New CD-ROM Drive Released (7/99)
Apple recently released a new 24x CD-ROM drive service
part for five-color iMacs with 266MHz processors or
faster only. Please note that this new 24x CD-ROM, called
the Version 2, is not compatible with the 24x CD-ROM drive
in the 233MHz Bondi Blue iMacs.
Although the two iMac CD-ROM drives are identical in fit
and performance, the drives are not interchangeable. The
24X CD-ROM, Version 2, may cause data loss if used in the
233MHz Bondi Blue iMac. To ensure proper compatibility,
please order the correct CD-ROM drive when servicing an
iMac.
Hot Issues New CD-ROM Drive Released (7/99) - 13
Ordering Parts
• If you are replacing a 24x CD-ROM drive in a Bondi Blue
iMac (233MHz), order the 661-2076 CD-ROM drive.
• If you are replacing a 24x CD-ROM drive in a five-color
iMac (266MHz or greater), order 661-2207, CD-ROM
drive, 24X, Ver. 2.
Refer to the Service Parts database for additional
information.
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Basics
iMac
Basics - 1
Overview
Basics Product Description - 2
Product Description
The iMac is an all-in-one
product with a unique
industrial design that is
targeted specifically for the
consumer and education
market.
To view a QuickTime movie
of the iMac click here.
Basics Standard Configurations - 3
Standard Configurations
• PowerPC G3 microprocessor running at 233, 266 or
333 MHz
• System bus speed at 66 MHz
• Backside cache of 512K
• 32 MB SDRAM SO-DIMM standard, expandable to 256
MB total using 144-pin, 100 MHz or faster SO-DIMM
modules
• 6 MB SGRAM standard
• Built-in 15” CRT (13.8” viewable area)
• 4 GB (on 233 MHz) or 6 GB hard drive (on the 266 MHz
and 333 MHz)
• 24x-speed ATAPI CD-ROM drive
• 56K hardware modem
• Two Universal Serial Bus (USB) Type A ports supporting
USB devices
• One RJ-11 modem port
Basics Standard Configurations - 4
• One 10/100 BaseT Ethernet RJ-45 connector for
connection to 10 mb/s or 100 mb/s networks
• Two internal ATA connectors: one supports the hard disk
drive and one supports the CD-ROM drive
• Two 3.5 millimeter (mm) headphone jacks
• One 3.5 mm sound output port for stereo sound output
• One 3.5 mm sound input port for stereo sound input. The
sound input port supports the Apple PlainTalk
Microphone that comes with some Macintosh computers.
The sound input port also supports a standard stereo
(miniplug-to-RCA) cable adapter for connecting stereo
equipment to your computer.
• Clock/Calendar featuring CMOS custom circuitry with
long-life battery
• Fan speed thermally controlled
• Energy Saver control panel
• Built-in 2D and 3D hardware graphics acceleration via
ATI Rage IIc graphics controller ASIC
Basics Model Comparison - 5
Model Comparison
233 MHz and 266 MHz iMac Models
The following information describes the main features of the
233 MHz and 266 MHz iMac models. Note: Apple regularly
makes modest design improvements to products during their
life cycles. These changes may include minor changes to the
logic board or additions in the bundled software.
Bondi Blue (w/IrDA) M6709LL/A
• OS Software: Mac OS 8.1
• ProcessorSpeed: 233 MHz
• Reset Procedure: Reset Button on Side
• Standard SGRAM: 2 MB SGRAM Built-in
• Hard Drive: 4 GB
• Graphic Chip: ATI Rage IIc
Basics Model Comparison - 6
Bondi Blue (no IrDA) M6709LL/B
• OS Software: Mac OS 8.5
• ProcessorSpeed: 233 MHz
• Reset Procedure: Front Power Button
• Standard SGRAM: 2 MB SGRAM Built-in + 4 MB SGRAM
DIMM
• Hard Drive: 4 GB
• Graphic Chip: ATI Rage Pro
Blueberry, (no IrDA) M7345LL/A
• OS Software: Mac OS 8.5.1
• ProcessorSpeed: 266 MHz
• Reset Procedure: Front Power Button
• Standard SGRAM: 2 MB SGRAM Built-in + 4 MB SGRAM
DIMM
• Hard Drive: 6 GB
• Graphic Chip: ATI Rage Pro Turbo
Basics Model Comparison - 7
Strawberry, (no IrDA) M7389LL/A
• OS Software: Mac OS 8.5.1
• ProcessorSpeed: 266 MHz
• Reset Procedure: Front Power Button
• Standard SGRAM: 2 MB SGRAM Built-in + 4 MB SGRAM
DIMM
• Hard Drive: 6 GB
• Graphic Chip: ATI Rage Pro Turbo
Grape, (no IrDA) M7390LL/A
• OS Software: Mac OS 8.5.1
• ProcessorSpeed: 266 MHz
• Reset Procedure: Front Power Button
• Standard SGRAM: 2 MB SGRAM Built-in + 4 MB SGRAM
DIMM
• Hard Drive: 6 GB
• Graphic Chip: ATI Rage Pro Turbo
Basics Model Comparison - 8
Tangerine, (no IrDA) M7391LL/A
• OS Software: Mac OS 8.5.1
• ProcessorSpeed: 266 MHz
• Reset Procedure: Front Power Button
• Standard SGRAM: 2 MB SGRAM Built-in + 4 MB SGRAM
DIMM
• Hard Drive: 6 GB
• Graphic Chip: ATI Rage Pro Turbo
Lime, (no IrDA) M7392LL/A
• OS Software: Mac OS 8.5.1
• ProcessorSpeed: 266 MHz
• Reset Procedure: Front Power Button
• Standard SGRAM: 2 MB SGRAM Built-in + 4 MB SGRAM
DIMM
• Hard Drive: 6 GB
• Graphic Chip: ATI Rage Pro Turbo
Basics Model Comparison - 9
333 MHz iMac Models
On April 14, 1999 Apple announced the 333 MHz iMac.
There were no other configuration changes to these
computers other than the processor speed.
• Blueberry, M7440LL/A
• Strawberry, M7441LL/A
• Grape, M7442LL/A
• Tangerine, M7443LL/A
• Lime, M7444LL/A
Basics New Technologies - 1 0
New Technologies
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
Macintosh PowerBooks) using the IRTalk protocol at a speed
of 230 kB/second (AppleTalk Only).
For information about whether or not iMac computers can
communicate with HP printers, contact Hewlett Packard.
Basics New Technologies - 1 1
For information about whether iMac computers can
communicate with other third-party IrDA compliant
devices, contact the manufacturer of the third-party device.
The iMac supports the following Apple devices on the IrDA
channel:
• PowerBook 2400 and 3400
• Macintosh Powerbook G3
IrDA vs. IRTalk
There are two main differences between IRTalk and IrDA:
1. IrDA is an industry standard, while IRTalk is an Appleonly technology.
2. IrDA supports TCP/IP and AppleTalk, whereas IRTalk
only supports AppleTalk.
The Infrared Control Panel gives information about any
Basics New Technologies - 1 2
Infrared connections that are established as well as what
type of infrared the iMac is currently set to use.
For infrared options to work there are three drivers that
must be in the Control Panels or Extensions folder. They are:
• Infrared Control Panel
• IrDALib Extension
• IrLanScannerPPC Extension
If these icons are not present or disabled, you will not be
able to make infrared connections from the iMac.
If you have used infrared communications with other Apple
products, you will notice a difference with iMac. The lens in
the rear of the iMac has been updated to support IrDA. The
new lens has about a 30 degree viewing angle. There is also a
minimum 3-foot distance for recognizing other Infrared
devices.
Basics New Technologies - 1 3
USB Support
Universal Serial Bus (USB) is a new device communication
standard developed by the computer and telecommunication
industries. USB provides a powerful, hot-swappable, “true
plug-and-play” interface between a host computer and addon peripheral devices. (
you can plug in, use, and unplug devices without having to
shut down the host computer.)
USB devices can include keyboards, mice, joysticks,
telephones, scanners, printers, security dongles,
microphones, speakers, floppy drives, cameras, modems,
CD-ROM drives, etc. USB technology can provide support for
anticipated future devices as well, such as digital subscriber
line (DSL) modems, cable modems, and MPEG video devices.
USB was designed to overcome limitations of earlier
peripheral connection technologies. USB allows end users to
: “Hot-swappable” means that
Note
Basics New Technologies - 1 4
connect peripheral devices to a host computer on the fly,
without having to hassle with
• Shutting down/restarting the computer
• Opening the computer case
• Installing a card
• ID conflicts
• Termination issues
• Loading device drivers (although some devices may
require a one-time driver installation).
In addition, USB provides the user with
• A “tiered star hub” network topology (see diagram later
in this section) allowing for the connection of up to 127
devices per host computer
• Two simple, standardized plugs for the broad range of
devices
• Power for some devices directly through the USB cable
• Two data speeds for devices: 1.5 and 12 megabits per
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