TM 5-6675-320-14
Table 4-26. HP-IB ERROR DISPLAYS AND POSSIBLE CAUSES
D i s p l a y o r P r i n t o ut
Possible Causes
“HP-IB IDENTIFIER BYTE IS
NOT CORRECT-- IT IS
IT SHOULD BE 60(OCT)”
“ERROR BYTE IS NOT CORRECT
- - I T I S
, IT SHOULD BE O“
“ADDRESS BYTE IS INCORRECT
- - I T I S , IT SHOULD
BE 325(OCT)"
“CHECK SWITCH
SETTING”
“CONTROL BYTE IS NOT RESET
CORRECTLY--IT IS , IT
SHOULD BE 100(OCT)"
“STATUS BYTE IS NOT RESET
CORRECTLY--IT IS
, IT
SHOULD BE 14(OCT)”
“TRIED TO CLEAR (SRQ, REN,
ATN, IFC or EDI) BUT
COULD NOT”
STATUS TEST FAILURES
(1)
( 2)
( 1)
( 2)
( 1)
(2)
( 3)
( 4)
(1)
(2)
(1)
( 2 )
Failure of PCA A2.
Bus ADDRESS switch set incorrectly.
Failure of ROM.
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 .
Improper select code switch setting .
Failure of select code switch.
Failure of select code decoders .
Improper ADDRESS switch
F a i l u r e o f
F a i l u r e o f
F a i l u r e o f
F a i l u r e of
c i r c u i t s .
CONTROL BYTE TEST FAILURES
( 1 ) F a i l u re
( 2 ) F a i l u re
( 3 ) F a i l u re
o f
o f
o f
c o n t r o l l o g ic
interrupt logic.
setting.
c i r c u i t r y .
m i c r o p r o c e s s o r.
computer interrupt
HP-IB transceivers .
c o n t r o l b u s l a t c h .
c o n t r o l l o g i c .
4-245
