TM 5-6675-320-14
Table 4-26. HP-IB ERROR DISPLAYS AND POSSIBLE CAUSES - Cont
D i s p l a y o r P r i n t o ut
Possible Causes
“ INTERFACE DOES PASS CONTROL,
F a i l u r e o f c o m p u t e r i n t e r r u p t c i r c u it
BUT DOES NOT ITSELF RELIN-
on PCA A1 or processor interrupt circuit
QUISH CONTROL”
on PCA A2.
“ INTERFACE DOES NOT PASS
(1) Cable is disconnected or loose.
CONTROL, BUT DOES ITSELF
RELINQUISH CONTROL. CHECK
( 2 ) F a i l u r e o f i n t e r r u p t c o n t r o l c i r-
TO BE SURE CABLE IS CONNECTED”
cuit on PCA A2.
“INTERFACE NEITHER PASSES
( 1 ) F a i l u r e o f i n t e r r u p t c i r c u i t s on
NOR RELINQUISHES CONTROL”
both cards.
(2) Failure of microprocessor.
“IUT CANNOT BE ADDRESSED AS
(1) Failure of output data or control
A TALKER BY ANOTHER CONTROL-
bus latch circuits on PCA A2.
LER. STATUS BYTE IS
(2) Failure of microprocessor .
“IUT CANNOT BE ADDRESSED AS
( 1 ) F a i l u r e o f d a t a i n p u t m u l t i p l e x e r,
A LISTENER BY ANOTHER CON-
c o n t r o l b u s l a t c h , o r i n t e r r u p t c i r-
TROLLER. STATUS BYTE IS
cuits on PCA A2.
(2) Failure of microprocessor.
4-248
PASS CONTROL FAILURES
EXTERNAL ADDRESS FAILURES
