HP 8924C Assembly page 545

If the first LED pattern
displayed is ...
1
4 3 2
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 A17 Memory board RAM failure
0001 and 0002 for A16 Host Controller board RAM failure
3. Second and third LED failure patterns:
0001 and 0001 for A17 Memory board RAM failure
0001 and 0010 for A17 Memory board RAM failure
Figure 50 First LED Patterns
N:\mkt\MANUALS\HP8924C\ALR\diagnos.fb
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)
RS-232 I/O
Serial Bus Communication (see
Signaling Board Self Test
CRT Controller Self Test
Miscellaneous Hardware (see figure 51.)
Chapter 14, Diagnostics Descriptions
Description Of Self-Test Diagnostic
LED Legend
= off
= rapid blink
= steady on or slow blink
)
figure 51
545