HP 3000 Series Installation And Service Manual page 48

Maintenance
5-9. Chip Tests
The fifth portion of the self-test program performs tests on the
remaining portions of the PCA boards, namely the communication
chips and the I/O controllers. LED indicator 4 is lighted at the
start of these tests. As each individual test in this group is
completed, the LEDs are incremented. If all of the tests are
successful, LEDs 0 and 7 are lighted. If any one fails, the
tests are not halted, but the appropriate LEDs are lighted.
5-10. BISYNC TEST. The first part of the Universal Synchronous/
Asynchronous Receiver /rransmi tter (BI SYNC) Test sets up the com-
munications interface and then transmits and receives 100 data
characters. Errors detected will be data overruns, data parity
errors, and any differences between data transmitted and data
received.
The second part of the BISYNC Test takes the data written in low
memory and transmits it to higher memory via the BISYNC chip and
DMA. At the successful completion of this test, LED indicator 5
is
1
igh ted.
5-11. SDLC TEST. The first part of the Universal Synchronous
Receive and Transmit (SDLC) Test sets up the communication inter-
face and then transmits and receives 100 data characters. Errors
detected will be receive errors, receive overruns, and receive
ab or ts.
The second part of the SDLC Test takes the data written in low
memory and transmits it to higher memory via the SDLC chip and
DMA. At the successful completion of this test, LED indicator 5
is turned off. If it fails, LED indicator 5 is left on.
5-5