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2.
OMRATING CONSIDENATIONS
The HitachL 5O5 (F:-gure 2'1-1)
is shipped complete with all
components in place except porrer supply and
DVM' Each unit
is com-
pletely
cafibrated
and adjusted at the time of manufacture '
After
perforrning the sirople installation
and check procedure outfined
in
the maintenance marulal , md connecting
the unit
to a suitable
polJer
sour€eo the computer is ready for operation'
The current hmiting
circuits
proi;ect the reference supplies
a n d a l l a c t i v e o p e r a t i o n a l e l e n e n t s f r o m d a m a g e d u e t o s h o r t i n g t . o
g r o u n d , o r t o e a c h o t h e r . T h u s a n e r r a n t p a t c h i n g c o r r ' n e c t i o n ( s h o r t -
i n g t h e p l u s r e f e r e n c e t o g r o u n d f o r e x a m p l e ) w i ] - l n o t a d v e r s e l y
effect
the supplies
(output current' drops to zero) nor will
the re-
ference supply fuse blow.
In addition,
the surface of ?re-Patch Panel
is covered with coloured plastic
plates
(except' frarne and handles) re-
clucing shorting-out
of ha-nging pat'eh cords.
a.
?reliminary
Operating Considerations
The following
sreps are recommended prior
to operating
the Hitachi
505 to prevent possible false trouble
indications.
(f)
Ascertain that each operational
amplifler
has a six connector
bottle
plug or a combination of bottl-e plugs equal to a six connector
b o t t l e p l u E : p r o p e r l y p l a c e d a n d s e a t e d a s s h o w n i n F i g u r e 2 . 2 _ I .
This provides the amplifiers
r^rit,h feedbaek artd prevent them from
overloading
during the problem solution.
L *
t
r
r
(
c
c
4
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