VRAM Upgrade

Caution The PowerBook Duo Dock contains CMOS devices that are very susceptible to ESD damage. Review the ESD precautions in Bulletins Safety. Note The PowerBook Duo Dock has 51 2K of video RAM soldered on the logic board. You can increase the amount of VRAM to 1 MB by installing a 51 2K VRAM SIMM in the SIMM slot (connector J9). Use only 1 00 ns or faster VRAM SIMMs. Note You cannot increase the amount of video RAM on the Duo Dock II, which comes with 1 MB VRAM. Grasp the VRAM SIMM by its edges...

IO Interfaces

Docking Connector Internal 152-pin processor-direct slot (PDS) connector to SCSI HDI-30 SCSI port with 1.5 MB sec. transfer rate Supports up to six external SCSI devices (five if drive is installed) Includes built-in terminator Connection to another computer requires HDI-30 SCSI system cable Apple Desktop Bus Apple Desktop Bus (ADB) port (recommend maximum of three low-speed, synchronous ADB devices) mini DIN-4 connector 200 mA maximum current draw for all ADB devices Two RS-422 serial ports...

Other

Modem Telephone line interface (DAA) circuitry (domestic) Support for external telephone line interface (DAA) circuitry (international) RJ-11 connector (domestic) mini DIN-8 connector (international) Docking Motor Motorized injection ejection mechanism draws the PowerBook Duo system into the Duo Dock and ejects the system from the Duo Dock DC motor operates at 5 rpm and provides 16-30 lb. of pull-in force Key locking device at left front of unit locks PowerBook Duo computer into the Duo Dock...

Floppy Drive

Before you begin, remove the following Caution The PowerBook Duo Dock contains CMOS devices that are very susceptible to ESD damage. Review the ESD precautions in Bulletins Safety. Turn over the subassembly and place it on the workbench pad with the floppy drive up. Pull out the plastic NuBus adapter card guide. Disconnect the floppy drive cable connector. 4 Pull out the two rear mounting latches and slightly lift the rear of the floppy drive. 5 Pull out the two front latches and remove the...

Logic Board

Before you begin, remove the following Modem interface card (if installed) Caution The PowerBook Duo Dock contains CMOS devices that are very susceptible to ESD damage. Review the ESD precautions in Bulletins Safety. Power supply cable from J1 1 Floppy drive cable from J1 3 Hard drive power cable from J1 4 Eject mechanism cable from J1 7 Hard drive data cable from J8 Note You must first release latches on the power supply, speaker, and eject mechanism cables to disconnect them from the logic...

Duo Dock II Upgrade

Before you begin, remove the following Modem interface card (if installed) Caution The Macintosh Duo Dock contains CMOS devices that are very susceptible to ESD damage. Review the ESD precautions in Bulletins Safety. Note Upgrade the Duo Dock to a Duo Dock II by adding a new logic board and cover. These parts are available individually, not as a kit. 1 Install the Duo Dock II logic board and cover (see Logic Board and Cover).

Math Coprocessor

Caution The PowerBook Duo Dock contains CMOS devices that are very susceptible to ESD damage. Review the ESD precautions in Bulletins Safety. Note You can add a Motorola 68882 math coprocessor to the logic board of the original Duo Dock, thereby increasing the overall performance of the Macintosh Duo System. Note The Duo Dock II includes a math coprocessor and therefore does not need this upgrade. 1 Position the math coprocessor with the beveled edge of the chip toward the front of the dock. 2...

Power Supply

Powerbook 100

Before you begin, remove the following Caution The PowerBook Duo Dock contains CMOS devices that are very susceptible to ESD damage. Review the ESD precautions in Bulletins Safety. 1 Depress the two plastic latches and push in the power supply at the receptacle. 2 Remove the power supply from the base. Replacement Note When replacing the power supply, you must first hook the cutouts in the bottom of the power supply over the three mounting tabs in the base. Then firmly push the power supply...

Release Mechanism

Note The following tools are required to disassemble the PowerBook Duo Dock Small flat-blade screwdriver Caution The PowerBook Duo Dock contains CMOS devices that are very susceptible to ESD damage. Review the ESD precautions in Bulletins Safety. Using a small, flat-blade screwdriver, release the latch and disconnect the two-wire motor cable from connector J18. Remove the four long screws that secure the release mechanism to the logic board. 3 Raise the motor end of the release mechanism and...

SCSI Devices

The PowerBook Duo Dock supports up to six SCSI devices. To avoid conflicting SCSI ID numbers, assign external SCSI devices numbers between 2 and 6. The hard drive inside the PowerBook Duo has SCSI ID number 0, and, if installed, the hard drive inside the Duo Dock has ID number 1. Note You must use an HDI-30 SCSI system cable to connect external SCSI devices to the Duo Dock. Caution When making SCSI connections, always switch off power to all devices in the chain. The PowerBook Duo Dock has a...

Hard Drives May Not Spin Up

Quadra 800 Scsi Chain

When inserted into a Duo Dock or Duo Dock II , your PowerBook 200 Series computer may not start from its internal hard drive. The conditions that can cause the problem include The PowerBook 200 Series Duo computer and Duo Dock hard drives have been formatted with different versions of HD SC Setup. Enough VRAM is installed to allow the option of thousands of colors when the PowerBook 200 Series computer is inside the Dock unless thousands of colors are selected, the problem does not occur . It...

NuBus Adapter Card

Before you begin, remove the following Modem interface card if installed Caution The PowerBook Duo Dock contains CMOS devices that are very susceptible to ESD damage. Review the ESD precautions in Bulletins Safety. Gently rock the NuBus adapter card from side to side and disconnect it from logic board connector J1 2.

Repair Strategy

Service the PowerDuo Dock, Duo Dock II, and Duo Dock Plus through module exchange and parts replacement. Customers can request on-site service from an Apple Authorized Service Provider Plus AASP Apple Assurance US only , or request a courier through the Apple Canada Technical Answerline Canada only . They can also choose carry-in service from an AASP. Apple Service Providers planning to support the products covered in this manual may purchase Service modules and parts to develop servicing...

Modem Interface Card

Cube Jumper Diagram

Note The modem interface card provides telephone line interface DAA circuitry for a PowerBook Duo with an internal modem. To address the differences between telephone interfaces and specifications, Apple provides both domestic and international versions of the modem interface card. Caution The Duo Dock contains CMOS devices that are very susceptible to ESD damage. Review the ESD precautions in Bulletins Safety. 1 Remove the modem port cover from the subassembly. 2 Insert the modem interface...