TM 5-6675-323-14
Table 3-26. HP-IB ERROR DISPLAYS AND POSSIBLE CAUSES
P o s s i b l e Causes
Display or Printout
STATUS TEST FAILURES
( 1 ) F a i l u r e of PCA A2.
"HP-IB IDENTIFIER BYTE IS
NOT CORRECT--IT IS
,
(2) B u s A D D R E S S s w i t c h s e t i n c o r r e c t l y .
I T SHOULD BE 60(OCT)"
( 1 ) F a i l u r e of ROM.
"ERROR BYTE IS NOT CORRECT
, IT SHOULD BE 0"
--IT IS
(2) F a i l u r e o f i n p u t / o u t p u t m u l t i p l i e r s .
(1) Improper select code switch setting.
"ADDRESS BYTE IS INCORRECT
-- IT IS
, IT SHOULD
(2) Failure of select code switch.
BE 325(OCT)" "CHECK SWITCH
SETTING"
(3) F a i l u r e o f s e l e c t c o d e d e c o d e r s .
I m p r o p e r ADDRESS switch setting.
(4)
(1) Failure
of
control
logic
"CONTROL BYTE IS NOT RESET
CORRECTLY--IT IS
, IT
(2) F a i l u r e o f i n t e r r u p t l o g i c .
SHOULD BE 100(OCT)"
(1) F a i l u r e o f m i c r o p r o c e s s o r .
"STATUS BYTE IS NOT RESET
CORRECTLY--IT IS
, IT
(2) F a i l u r e o f
computer
interrupt
SHOULD BE 14(OCT)
circuits.
CONTROL BYTE TEST FAILURES
(1) Failure of HP-IB transceivers.
"TRIED TO CLEAR (SRQ, REN,
ATN, IFC or EDI) BUT
(2) Failure of control bus latch.
COULD NOT"
(3) Failure of control logic.
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