HP 3000 Series Installation And Service Manual page 49

Ma intenance
Table 5-1. Meanings of Self-test LED Indicator Patterns
LED PATTERN
BEING DISPLAYED TEST FAILURE SIGNIFIED
BY LED PATTERN
7 6 5 4 3 2 1
0
(WHICH TEST FAILED)
* *
None
* * *
Basic Instr uction Set Test
* * * ROM Test
* * * SDLC Test
* *
* *
SDLC Test with DMA
* * *
BISYNC Test
* *
* *
BISYNC Test with DMA
0 0 0 0 * * *
RAM Test
* * * *
RAM Test Par ity
Er
ror
* * * *
Timer Interrupt Test
*
*
* * *
BISYNC and SDLC Tests w/DMA
Legend:
* =
LED 1 ighted
0
=
When 1 ighted, the coded pattern signifies which
chip (bit) has failed (see table 5-2)
5-8