
Chapter 3 59
Troubleshooting
Self-Test Diagnostics (Step 1)
Figure 3-8 First LED Patterns
If the first LED
pattern displayed is...
Then the failure is...
Microprocessor
ROM Checksum (See note 1.)
RAM (See note 2.)
RAM (See note 3.)
Timer
Real-Time Clock
Keyboard (stuck key or faulty key-down detector)
Control Interface, A2A70 (See note 4.)
Serial Bus Communication (see figure 3-9 on page 60)
Signaling Board Self Test
Display Drive Self Test
Miscellaneous Hardware (see figure 3-10 on page 61)
NOTES
1. Second and third LED failure patterns:
0001 and 0001 for any main ROM failure
0001 and 0002 for boot ROM failure
2. Second and third LED failure patterns:
0001 and 0001 for A2A30 Memory/SBRC board RAM failure
0001 and 0002 for A2A31 Controller board RAM failure
3. Second and third LED failure patterns:
0001 and 0001 for A2A30 Memory/SBRC board RAM failure
0001 and 0010 for A2A30 Memory/SBRC board RAM failure
4. Second and third LED failure patterns for Control Interface:
0001 and 0001 for Serial Port 9 failure
0001 and 0010 for Serial Port 10 failure
321
0
= off
= rapid blink
= steady on or slow blink
LED Legend
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