Self-Test Controls And Indicators - HP 7925D Service Manual

TEST RESULT
Appendix A
4
--=------0
o
o
o
S.T. FAILED
01-------=---5
7925
TEST NUMBER OP START
I
~ ~ ~ ~
~
~
SERVICE
I
2 3
1. TEST NUMBER switches
2. OP/SERVICE switch
3. START switch
4. TEST RESULT LED's
5. S.T. FAILED LED
7300-99
A·40
Select desired self-test test number in octal when OP/SERVICE switch (2) is in
SERVICE position.
Selects self-test mode of operation. When OP position is selected, controller
executes self-test routine at power turn-on, on HP-IB command, or when
START switch (3) is activated. Switch must be in OP position for disc drive
to operate normally. When SERVICE position is selected, controller will loop
continuously in self test until a fault is detected.
Initiates self-test operation. Switch is spring-loaded in off position.
Provides a readout of self-test operation. At beginning of self-test routine, LED's
will flash briefly, indicating controller activity and testing of LED's. If a test
fails, the LED's indicate the number of the failed test in octal. If self test passes,
the LED's remain unlit.
Indicates a self-test (S.T.) failure. Result is duplicated by SELF TEST FAILED
indicator on disc drive operator panel.
Figure A-12. Self-Test Controls and Indicators