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APPENDIX A
DIAGNOSTIC MODE SELF TEST
The ACB- 5500 oper at ing microcode con ta ins a d iagnost i c routi ne
that is run when the DIAG jumper is installed.
The primary
purpose of this self test is to improve the reliability,
maintainability and serviceability of the ACB-5500.
The self
test per form s opera tiona 1 tests on the controller's maj or VLS I
devi ces and has the abi 1 i ty to read/wr i te disk da ta and reports
errors by flashing the on-board LED.
Self test is initiated upon reset or power-on of the ACB-5500
when the DIAG jumper is installed.
The self test is repeated
allowing for the isolation of hardware problems in a customer
environment.
Six possible error states can occur as a result of the self test.
The
LED signals
indicating each
error state are shown in Table
A-I.
Table A-I.
Self Test Error States
LED Flashes
Error Source
Solid Light
1
2
3
4
5
Board/8085 Microprocessor
27218 EPROM
8156 Local RAM
6116 Working RAM Failure
AIC-0l0 SERDES
AIC-300 Buffer Controller
The lack of any error states indicates successful passage through
the controller self test.
500504-00
A-I
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