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MAINTENANCE
SYSTEM
TROUBLE
REPORTED
USER-REPORTED
DISCUSS THE TROUBLE
WITH SYSTEM USERS
CAP ALARM
REPORTED
CAP ALARMED
READ PERMANENT
SYSTEM ALARMS
TABLE IN ERROR
LOG:
AND CHECK
CIRCUIT BOARDS
AND POWER LED
STATUS
SYSTEM OR CANNOT
ACCESS ERROR LOG
DEFECTIVE
POWER
SUPPLY
CHECK POWER
LED AND FANS
READ (1) PERMANENT SYSTEM
ALARMS, (2) TRANSIENT
SYSTEM ERRORS TABLE,
AND/OR (3) MOST RECENT
SYSTEM ERRORS IN TABLE
ERROR LOG ;
AND CHECK CIRCUIT
BOARDS AND POWER SUPPLY
LED STATUS
CPU/MEMORY
CIRCUIT FRONTPLANE/
BACKPLANE DIAGNOSTIC
REPLACE
POWER
SUPPLY
TYPE OF TROUBLE INDICATED
BY THE LEDS AND ERROR LOG
ERROR LOG CONFIRMS
USER-REPORTED TROUBLE
PORTS
POWER
SUPPLY
CABINET
OR FANS
CPU/MEMORY
SERVICE CIRCUIT
FRONTPLANE/
BACKPLANE
DIAGNOSTIC
NO ERROR LOG
RESULTS
RECREATE USER-REPORTED TROUBLE
STATIONS TRUNKS OTHER
ISOLATE TROUBLE TO
REPLACEABLE MAINTENANCE
UNIT (SEE TEXT)
RUN
STATION
TEST (S)
SEQUENCE
RUN
TRUNK
TEST (S)
SEQUENCE
(DEPENDING
ON PROBLEM,
SEVERITY)
FIRST. WARM
START. IF
PROBLEM PERSISTS
RESTORE
TRANSLATIONS
FROM TAPE. IF
PROBLEM PERSISTS
ESCALATE.
Figure 4-1. Response to System 25 Trouble Report
4-10