Dell OptiPlex 990 Desktop Service Manual page 81

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Service manual (94 pages)

Technical manualbook (50 pages)

Setup and features information (14 pages)

Table Of Contents

100

101

102

103

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Cause

Microprocessor register failure

Code

Cause

Code

1-1-4

Cause

ROM BIOS checksum failure

Code

1-2-1

Cause

Programmable interval timer

Code

Cause

Code

1-2-3

Cause

DMA page register read/write failure

Code

1-3-1 through 2-4-4

Cause

DIMMs not being properly identified or used

Code

Cause

Code

3-1-2

Cause

Master DMA register failure

Code

3-1-3

Cause

Master interrupt mask register failure

Code

3-1-4

Cause

Slave interrupt mask register failure

Code

3-2-2

Cause

Interrupt vector loading failure

Code

3-2-4

1-2-2

DMA initialization failure

3-1-1

Slave DMA register failure

1-1-3

NVRAM

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Optiplex 790 D05d

Dell OptiPlex 990 Desktop Service Manual page 81

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