Service manual

Maintenance
Self Test 4
4-17
9005 Serial Interface Fault Addr id
When this fatal error occurs the system will continuously try to repeat whatever it was
doing - the user interface will be inoperative.
See Tabe 4-6 for descriptions of the serial interface errors.
Table 4-6. Serial Interface Errors
id Fault
01 Phase Error The phase counter is either out of range for the
current sequence or an interrupt from the serial
interface or delay timer occurred the other was
expected. Probably due to corruption of the phase
counter. This could be either a software or a
hardware fault.
02 NOT Transfer Complete a) Tx_complete status was false when "interrupt on
Tx complete" received.
b) Tx_complete did not become true within timeout
period when "on RTx" received.
Both caused by fault in interface hardware, probably
digital ULA fault.
03 True Complement Error True_compl_error was true after a read transfer.
Tested during read sequence on all transfers Can
be because serial data coming from the analog
subsystem to the digital ULA is corrupt. Could also
be a serial clock or enable problem.
04 In Guard Error Indicates in_guard circuit latches corrupted, and
new update required. Reported as fail after 20
consecutive errors. (This signal may be polled
during updates, otherwise it causes an interrupt.)
05 State Change Timeout Interface state change between "read", "wait" and
"write" states did not occur within timeout period.
Interface hardware fault - suggests ULA (or
associated signals) problem.
06 A-D timeout A-D did not produce RTx within hardware timeout
period after CI. A-D or hardware fault. Suggests A-
D not being initiated or RTx not getting back to
digital ULA. Could be an analog problem if the A-D
locks up.
07 No RTx after abort Latched RTx did not appear after abort sent. A-D or
CI hardware fault. Suggests A-D not being initiated
or RTx not getting back to digital ULA Could be an
analog problem if the A-D locks up.
08 Switching counter
inoperative
Switching counter in-operative when tested at
power-on. suggests ULA (or associated signals)
problem.
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