AT&T PC 6300 - Page 8

Service Manual
SYSTEM TEST DIAGNOSTICS (OVERLAY
VERSION) 4-87
Loading System Test (Overlay Version) 4-87
STAND-ALONE MOTHERBOARD DMA
TEST DIAGNOSTICS 4-89
DMATest . . .i . 4-89
STAND-ALONE LOW-LEVEL FORMAT
UTILITY TEST 4-92
General Characteristics 4-93
The Bad Track Table 4-95
List of Operations 4-96
Help 4-101
HDU Configuration 4-102
Low-Level Format .. ... 4-105
Display and Edit Bad Track Table 4-110
Format Bad Tracks 4-119
Verify Surface Test 4-121
Ship the Unit 4-124
Exit Low-Level Format (LLF) Utility 4-125
CUSTOMER AND SYSTEM TEST ERROR
MESSAGES 4-127
100—Motherboard Tests 4-127
300—Memory Tests 4-129
400—Keyboard Tests 4-133
500—Video Tests 4-137
600—Parallel Port Tests • • • 4-144
700—8250 Serial Port Tests — .. 4-145
800-MFD Unit Tests 4-147
900-HDU Tests 4-149
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