IBM 3270 Maintenance Manual page 473

Top View
Option Adapter
Expansion Board
Expansion Board
Expansion Unit
Expansion
Slots
I
Receiver Card
Slot for
Fixed Disk Drive D
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Fixed Disk Drive C
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UL1
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LI6
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J8
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LlOr_Expansion Board
Power Connectors
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4-1800-2 Maintenance Information