Apple 230, DUO 280C, DUO 27C, 250, POWERBOOK DUO FLOPPY ADAPTER manual Memory, Rom

Page 16

Specifications	Memory - 4

Memory

RAM 210/230/250

4 MB RAM soldered on the logic board Expandable to 24 MB

Requires 70 ns or faster RAM chips

RAM 270c	4 MB RAM soldered on the logic board
	Expandable to 32 MB
	Requires 70 ns or faster RAM chips

RAM 280/280c

ROM

4 MB RAM soldered on the logic board Expandable to 40 MB

Requires 70 ns or faster RAM chips

1 MB

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Contents PowerBook 200 Series Basics System Overview SystemDuo Docks, or the Duo Repair Strategy OrderingUSA Ordering Canadian Ordering Warranty/AppleCare/ARIS US OnlySelf-Threading Screws Page CPU Speciﬁcations Introduction Processor Addressing Memory ROMPram Disk Storage Floppy DriveInterfaces Devices KeyboardSound and Video Sound GeneratorVideo Display Video Display 280c Main Battery 250/ 270c ElectricalMain Battery Physical Environmental Other Express ModemTroubleshooting General Power Manager Reset Symptom Charts Startup Power Power Power Power Power Power Video Video Video Video Video PowerBook Duo 270c/280c Video Video Video Video Video External Floppy Drive TroubleshootingSymptom Charts/External Floppy Drive External Floppy Drive Troubleshooting Symptom Charts/External Floppy Drive Hard Drive Peripherals TroubleshootingSymptom Charts/Peripherals Peripherals Peripherals Peripherals Peripherals Peripherals Troubleshooting Symptom Charts/Peripherals Peripherals Internal Modem TroubleshootingSymptom Charts Internal Modem Internal Modem Internal Modem Internal Modem Miscellaneous TroubleshootingSymptom Charts/Miscellaneous Replace speaker assembly Take Apart Main Battery Keyboard Page Page Replacement Caution Don’t overtighten the keyboard screws Cables Palm Rest Release Tabs Cables End Clutch Covers End Clutch Cover Top Case Page Interlocking Tabs Notch Rubber Bumper Hard Drive Page Replacement Note Before Take Apart Hard Drive Pull back the EMI shield Units, Phillips screws Backup Battery Page Backup Battery Cable Trackball Page Trackball Assembly Trackball Cable Replacement Note When Center Clutch Cover Page Page Take Apart Center Clutch Cover Before reattaching Door before snapping Display Assembly CPU Stiffener Page Replacement Note Route Important Follow thisPage Take Apart EMI Clip Replacement Note After Display Assembly Page Page Take Apart Display Assembly Display Mounting Clip Display Legs Take Apart Display Assembly Place the display assembly Face down, with the display Open Position Center Clutch Bottom Case Cover You reassemble the unit Page Take Apart CPU Stiffener Page Display Switch Cable Microphone Display Switch Cable Microphone Replacement Note Page Replacement Note Move If you are replacing a Replacement CPU stiffeners Replacement Caution If you Duo 210, 230, 250, 270c Duo 280, 280c Heatsink Logic Board Page Page Board or modem board Replacement Note If you Case Bottom Page 270c Case Bottom Gaskets Logic Board Support Replacing the case bottom on Replacement Caution Do Display Housing Page Page Take Apart Display Housing Screw covers are disposable Side Tab Latch Take ApartDisplay Housing Remove the display housing Replacement Caution Replacement Caution Make sure the display cable clears280c display housing kit 210/230/250/280 Dsply CablePage Page Place the display Take Apart 210/230/250/280 Dsply Cable Actuator and the inverter Brightness Actuator Assembly Tape Replacement Note Check Inverter Board Tape Replacement Note If Remove the ground screw Release Tabs Display Cable Torsion Bar Installing the new display 270c/280c Display Cable Page Page Display cable is available to Mounting Screw Inverter Board Shield Display Shield IC Extractor Display Cable Connector Inverter Board Take Apart 270c/280c Display Cable Cable connector from Display cable is attached to Page 270c/280c Inverter Board Page Inverter Board Inverter Cable Connector IC Extractor Display Cable Board Locking Tab Actuator 270c/280c Actuator Page Inverter Board IC Extractor Display Cable Locking Tab Actuator Assembly Actuator Assembly Button Cover 270c/280c Speaker Page Disconnect the speaker Feet Foot Cap Rear Cover Rear Cover & I/O DoorDon’t overtighten Display Mounting Clip Top Cover Metal Link Door Upgrades Modem Page Upgrades Modem Page Modem Card Memory Expansion Page Upgrades Memory Expansion Page Floppy Adapter Upgrades Floppy Adapter Upgrade Page Page 270c Upgrade Page Page Page 280/280c Upgrade Page Case Bottom CPU Stiffener Logic Board Display Assembly Cable Upgrading a Duo Side Latch Display Assembly Upgrades280/280c Upgrade To avoid losing the latch Release Tabs Display Cable Torsion Bar Additional Screw Length on Hole 280/280c Display Cable Upgrades 280/280c Upgrade Upgrading a Duo 250 or 270c Series Upgrade Page Page Page Page Page Page Page Page Page Page Replacement Note After Page Additional Procedures Battery Recharger Additional Procedures Battery Recharger Type Battery Recharger Page Page Battery Handling ±Warning Return Page Extension. Before Page Partially-charged Page Page Align Battery Contacts Page Two outer battery contacts so Offer resistance to Page Battery Verification Page Battery. If the reading AC Adapter Verification Positive Probe Negative Probe Page Exploded View PowerBook Duo 200 Series

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