HP 3000 Series Installation And Service Manual page 52

Maintenance
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)
I
* *
None
l
r
* * *
Basic Instruction Set Test
I
* * *
ROM Test
* * *
SDLC Test
* *
*
*
SDLC Test with DMA
* * *
BI SYNC Test
*
*
*
*
BI SYNC Test w· ith DMA
!
0 0 0
0
* * *
RAM Test
*
* * *
RAM
Test Parity Error
* * * *
Timer Interrupt Test
* * * * *
BISYNC and SDLC Tests w/DMA
Legend:
* =
LED 1 ighted
0 =
When 1 igh ted, the coded pattern signifies which
l
chip (bit) has failed
(see table 5-2)
5-9