Apple Macintosh Powermac Performa WS7250 Service Manual
K
Service Source
Power Macintosh 7200
Series/WS 7250
Power Macintosh 7200/75, 7200/90, 7200/120 and
WS 7250/120
K
Service Source
Basics
Power Macintosh 7200 Series/
WS 7250
Basics Overview - 1
Overview
The chassis design of the Power Macintosh 7200 Series and
WS 7250 computers allows you to access the logic board and
its components without having to remove the power supply
or any drives. This flexible design makes these computers
easier to service and upgrade.
Features of the Power Macintosh 7200 Series include
• A 75, 90, or 120 MHz PowerPC™ 601 microprocessor
with built-in FPU and optional Level 2 cache
• Three PCI expansion slots
• 5 MB per second internal and external SCSI channels
• DRAM expansion up to 256 MB using 168-pin, 70 ns,
64-bit DIMMs
• 1 MB of soldered VRAM, expandable to 2 or 4 MB
• Built-in AAUI and 10BASE-T Ethernet
• Two GeoPort serial ports
Basics Overview - 2
• AppleCD™ 600i or 1200i CD-ROM drive
• CD-quality stereo sound in/out
• Optional PC Compatibility Card (Power Macintosh
7200/120)
• Mac™ OS system software 7.5.2 (7200/75 and
7200/90), system software7.5.3 (7200/120), and
system software7.5.3 Revision 2 (7200/120 8x-CD)
Note
: VRAM expansion works as follows: 1 MB of VRAM is
soldered to the board. To go to 2 MB, install one 1 MB VRAM
DIMM in slot 1. To go to 4 MB, install three 1MB VRAM
DIMMs in slots 1, 2, and 3.
Features of the Workgroup Server 7250/120 include
• A 120 MHz PowerPC™ 601 microprocessor with built-
in FPU and 32K on-chip cache
• 256K level 2 cache
• 16 MB of DRAM, expandable to 256 MB
Basics Overview - 3
• Three PCI expansion slots
• SCSI DMA bus that supports up to four external and
three internal SCSI devices
• Built-in AAUI and 10BASE-T Ethernet support
• Support for AppleTalk and TCP/IP networking protocols
• Two GeoPort serial ports
• 1.2 GB or 2 GB hard drive
• AppleCD™ 600i or 1200i CD-ROM drive
• 16-bit stereo sound input/output
• 1 MB of soldered VRAM
• Mac™ OS system software 7.5.3 Revision 2
The Power Macintosh 7200 and WS 7250 computer is
pictured on the following page.
Basics Overview - 4
Power Macintosh 7200 and WS 7250 Computer
Basics Configurations - 5
Configurations
The Power Macintosh 7200 Series computers come standard
with
• 75, 90, or 120 MHz PowerPC 601 microprocessor
• 8 or 16 MB DRAM
• 500 MB or 1.2 GB hard drive
• AppleCD 600i CD-ROM (7200/75, 7200/90, and
7200/120) or 1200i CD-ROM (7200/120 8x-CD)
• 1 MB of VRAM soldered to the logic board
The WS 7250/120 computer comes standard with
• 120 MHz PowerPC 601 microprocessor
• 16 MB DRAM
• 1.2 GB or 2 GB hard drive
• AppleCD 600i or 1200i CD-ROM drive
• 1 MB of VRAM soldered to the logic board
Basics PowerPC 601 Microprocessor - 6
PowerPC 601 Microprocessor
The Power Macintosh 7200 Series and WS 7250 computers
feature the PowerPC 601 RISC microprocessor. Features of
this microprocessor include
• Full RISC processor architecture
• 32-bit addressing
• 64-bit data bus
• Built-in FPU
• 32K cache for data and instructions
• Internal Memory Management Unit (MMU)
• Advanced branching techniques for improved throughput
Basics Peripheral Component Interconnect (PCI) - 7
Peripheral Component Interconnect (PCI)
The Power Macintosh 7200 Series and WS 7250 computers
offer a Peripheral Component Interconnect (PCI) expansion
bus. Because the PCI bus is an industry standard, most
existing PCI 2.0-compliant cards (with the addition of a Mac
OS-specific software driver) will work in these computers.
PCI offers significantly higher performance than the NuBus
architecture used in previous Macintosh models. Running at
33 MHz, the PCI bus is up to three times faster than NuBus,
offering overall enhanced system performance, particularly
in the areas of video and networking.
Basics Dual In-Line Memory Modules (DIMMs) - 8
Dual In-Line Memory Modules (DIMMs)
The Power Macintosh 7200 Series and WS 7250 computers
use DRAM Dual In-Line Memory Modules (DIMMs) instead
of DRAM SIMMs. Whereas SIMMs have 72 pins, DIMMs have
168 pins. The extra pins provide a 64-bit data path,
compared to a 32-bit data path for SIMMs. In addition,
DIMMs do not have to be installed in pairs like the SIMMs on
earlier Macintosh models.
Important:
Modules (SIMMs) used in previous Macintosh models are
not
compatible with the Power Macintosh 7200 Series and
WS 7250 computers.
The VRAM and DRAM Single In-Line Memory
Basics Memory Configurations - 9
Memory Configurations
The Power Macintosh 7200 and WS 7250 logic boards have
four DRAM DIMM slots, each with a 64-bit data bus. You can
increase the computer’s DRAM to a total of 256 MB using 5volt, 64-bit-wide, 168-pin fast-paged mode, 70 ns
DIMMs.
Note:
These computers do not have any main memory
soldered to the logic board. At least one DRAM DIMM must be
present for the computer to operate.
DRAM DIMMs can be installed individually or in pairs. These
computers support linear memory only; therefore, no
memory gains are seen when two DIMMs of the same size are
installed (that is, memory interleaving is not supported on
the Power Macintosh 7200 Series/WS 7250 computers).
Basics Memory Configurations - 10
Note: DIMMs purchased from different manufacturers can
be paired; However, Apple recommends that you use DIMMs
of the same size and speed.
The drawing on the next page illustrates where the DRAM
slots are located on the Power Macintosh 7200 Series/WS
7250 logic boards and how they are numbered. DRAM can be
installed in any order.
Basics Memory Configurations - 11
4
3
2
1
Figure: DRAM DIMM Slots
Basics Ethernet Support - 12
Ethernet Support
There are two Ethernet ports on the Power Macintosh 7200
Series and WS 7250 logic boards: an AAUI port and a
10BASE-T port. You can use only one Ethernet port at one
time, however. If you have cables plugged into both Ethernet
ports, the computer uses the 10BASE-T port by default.
GeoPort
Geoport is a hardware and software communications
architecture that has been optimized for computertelephony integration. It has three main attributes:
• It lets any computer connect to any telephone (analog or
digital, public or private) anywhere in the world.
Basics GeoPort - 13
• Once connected, it supports an arbitrary number of
independent data streams up to a total bandwidth of 2 MB/
second.
• Unlike traditional asynchronous data communications
(such as AppleTalk), GeoPort also supports isochronous
data streams (such as real-time voice and video) and
provides the real-time Application Program Interfaces
(APIs) necessary to hide the implementation details
from both the recipient and the sender.
By attaching an Apple GeoPort Telecom Adapter to the Power
Macintosh 7200 or WS 7250, you can enjoy all the features
of a 14.4 modem, including data, fax, send and receive, and
voice capabilities. The GeoPort Telecom Adapter serves as a
line interface to standard (analog) telephone lines. The
adapter is capable of sending or receiving data at up to 14.4
kbps and faxes at up to 9600 bps using the GeoPort Telecom
Adapter software.
Basics PC Compatibility Cards - 14
PC Compatibility Cards
The Power Macintosh 7200/120 features an optional PC
Compatibility card, which brings full DOS functionality to
the Macintosh computer. Two versions of the PC
Compatibility card are available: a 7" card and a 12" card.
The cards plug into any available PCI slot on the logic board.
The two PC Compatibility cards are also available in
individual upgrade kits. Refer to the Upgrades chapter in
this manual for installation instructions.
Basics The Cuda Chip - 15
The Cuda Chip
The Cuda is a microcontroller chip. Its function is to
• Turn system power on and off
• Manage system resets from various commands
• Maintain parameter RAM (PRAM)
• Manage the Apple Desktop Bus (ADB)
• Manage the real-time clock
Many system problems can be resolved by resetting the Cuda
chip (see Symptom Charts for examples). Press the Cuda
reset button on the logic board to reset the Cuda chip. (See
"Logic Board Diagram" later in this chapter to locate the
Cuda reset button.) If you continue to experience system
problems, refer to "Resetting the Logic Board" later in this
Basics chapter.
Basics Resetting the Logic Board - 16
Resetting the Logic Board
Resetting the logic board can resolve many system problems
(refer to "Symptom Charts" for examples). Whenever you
have a unit that fails to power up, you should follow this
procedure before replacing any modules.
1 Unplug the computer.
2 Remove the battery from the logic board. (See Take
Apart for instructions on how to remove the battery.)
3 Disconnect the power supply cable from the logic board
and then press the Power On button. (See "Logic Board
Diagram" later in this chapter to locate the Power On
button.)
4 Wait at least 10 minutes before replacing the battery.
Make sure the battery is installed in the correct +/direction.
Basics Resetting the Logic Board - 17
5 Reassemble the computer and test the unit.
Note:
This procedure resets the computer’s PRAM. Be sure
to check the computer’s time/date and other system
parameter settings afterwards.
Note:
If this procedure resolves the problem, claim an
adjustment on an SRO. If not, replace the defective
component and DO NOT claim the adjustment procedure.
Basics Rear View Diagram - 18
Rear View Diagram
The Power Macintosh 7200 Series and WS 7250 computers
offer the following external ports: SCSI, AAUI Ethernet,
10BASE-T Ethernet, serial printer (GeoPort compatible),
serial modem (GeoPort compatible), DB-15 video, ADB,
sound input, and sound output.
The drawing on the next page illustrates the external ports
on the Power Macintosh 7200 Series and WS 7250
computers.
Basics Rear View Diagram - 19
Printer
Sound Out
Sound In
SCSI
AAUI
Ethernet
10BASE-T
ADB
Monitor
Modem
Ethernet
Figure: Power Macintosh 7200 and WS 7250 Rear Panel
Basics Power Macintosh 7200 Logic Board Diagram - 20
Power Macintosh 7200 Logic Board Diagram
There are five versions of the Power Macintosh 7200 logic
board: one 75 MHz version, two 90 MHz versions, and two
120 MHz versions. The two 90 MHz versions of the logic
board are functionally equivalent, as are the two 120 MHz
versions; However, one of the 90 MHz versions and one of
the 120 MHz versions has an auxiliary fan that connects at
J70.
Important
and one black wire) that runs from the processor to the logic
board or you will damage the board.
The following drawing shows the Power Macintosh 7200
logic board. Refer to the parts chapter for information on
how you can distinguish between the different logic boards.
: Do not unplug the Peltier device (one red wire
Basics Power Macintosh 7200 Logic Board Diagram - 21
External SCSI
AAUI Ethernet
10BASE-T
Ethernet
Modem (bottom)
Printer (top)
Sound Out (top)
Sound In (bottom)
PCI Slots
Internal
SCSI
Power
Supply
CD
Audio
Floppy
Drive
3.3V Power
Video
ADB
Cuda Reset
PowerPC 601 Processor Speaker
Figure: Power Macintosh 7200 Logic Board
Supply
4
3
2
1
3
2
1
Battery
DRAM Slots
VRAM Slots
Cache DIMM
ROM SIMM
Power LED
Power
On/Off
Basics Workgroup Server 7250 Logic Board Diagram - 22
Workgroup Server 7250 Logic Board Diagram
There is only one version of the WS 7250 logic board, which
features a 120 MHz microprocessor. This board does not
require an auxiliary processor fan.
The following drawing shows the WS 7250 logic board.
Some versions of the logic board have a ROM SIMM while
others have the ROM soldered on the logic board.
Note:
Basics Workgroup Server 7250 Logic Board Diagram - 23
External SCSI
AAUI Ethernet
10BASE-T
Ethernet
Modem (bottom)
Printer (top)
Video
ADB
Sound Out (top)
Sound In (bottom)
PCI Slots
Cuda Reset
Internal
SCSI
Power
Supply
CD
Audio
Floppy
Drive
3.3V Power
Supply
4
3
2
1
3
2
1
PowerPC 601 Processor Speaker
Figure: Workgroup Server 7250 Logic Board
Battery
DRAM Slots
VRAM Slots
Cache DIMM
ROM SIMM
Power LED
Power
On/Off
Basics Repair Strategy - 24
Repair Strategy
Service the Power Macintosh 7200 Series and WS 7250
computers through module exchange and parts replacement.
Customers can request on-site service from an Apple
Authorized Service Provider Plus (AASP+) or Apple
Assurance. They can also choose carry-in service from an
AASP.
Ordering
Apple Service Providers planning to support the Power
Macintosh 7200 Series and WS 7250 computers may
purchase Service modules and parts to develop servicing
capability. To order parts, use the AppleOrder system and
refer to the Power Macintosh 7200 or Workgroup Server
7250 "Service Price Pages."
Basics Ordering - 25
Large businesses, universities, and K-12 accounts must
provide a purchase order on all transactions, including
orders placed through the AppleOrder system. Service
providers not enrolled in AppleOrder may fax their orders
to Service Provider Support (512-908-8125) or mail
them to
Apple Computer, Inc.
Service Provider Support
MS 212-SPS
Austin, TX 78714-9125
If you have further questions, please call Service Provider
Support at 800-919-2775 and select option #1.
Basics Warranty and AppleCare - 26
Warranty and AppleCare
The Power Macintosh 7200 Series and WS 7250 computers
are covered under the Apple One-Year Limited Warranty.
The AppleCare Service Plan is also available for these
products. Service Providers are reimbursed for warranty
and AppleCare repairs made to these computers. For pricing
information, refer to "Service Price Pages."
K
Service Source
Specifications
Power Macintosh 7200 Series/
WS 7250
Specifications Processor - 1
Processor
CPU
PM 7200/75 and 7200/90
PM 7200/120 and WS 7250/120
PowerPC 601 RISC microprocessor running at 75 or 90 MHz
Built-in FPU and 32K cache
Requires system software version 7.5.2 or later with appropriate
System Enabler
PowerPC 601 RISC microprocessor running at 120 MHz
Built-in FPU and 32K cache
Requires system software version 7.5.3 or later with appropriate
System Enabler
Note: the 8x CD configurations of the Power Macintosh 7200/
120 and 7250/120 require system software 7.5.3 Revision 2.
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