)
)
)
Service Administrative Support
1800
SERIES
TEST
STATION,
SIGNAL
SENSE
~
MANUAL
CORRECTION
(CONT.)
1807
Test Station
Manual
070-4134-00
Schematic
Diamond
48
The
pin
numbers
on
the optical iso-
lator
P/N
156-0109-00
are
not
shown
on
the schematic.
On
the
670-3782-00
the
!C's are
U21,
U22, U23,
U24,
U44,
and
U34.
On
the
670-3782-01
the
!Cs
are
U21,
U23, U24,
U25,
U44,
and
U34.
Below
is a
drawing
of the
IC
pin
configuration.
~-['2-:;
I I
3...J,... 4
L
__
J
156-0109-00
w2
Issue
13-21
1910
+5V
POWER
SUPPLY
FAILURES
REF:
1910
Service
Manual
070-4523-00
Two
1910's recently received in a
Service Center
had
the emitter lead of
Q20
shorted to
ground
(Schematic 14).
This
was
caused
by
the
screws
holding
the
rackmount
latches.
These
screws
had
penetrated too far into the
chassis, shorting
an
adjacent cable.
Further investigation revealed the
absence of the
lock
washers
that
were
intended to
be
used
with these screws
(see
items
71
&
72
on
Figure 1 in the
manua
1).
Please inspect
any
rackmount
1910's
for these
washers
and
install
where
necessary.
Use
P/N
210-0008-00.
The
washer
should provide adequate
clearance
behind
the screw, thus
preventing
this
type of
failure.
w2
Issue
13-21
·-17-
October,
1983
laaue
31
1980
PRINTER
PATCH
REF:
1980
Terminal
Driver
manual
070-2922-00
When
a
printer
is attached to
one
of
the
RS-232C
ports
on
the
1980
with the
intention of using
it
as
the report
generator for scheduled or
out-of-limits data,
many
parameters
can
be
defined
by
the operator for the
interface.
The
Application
Programs
also predefine these parameters to a
set
of default values,
some
with
user-definable alterations available
during
initialization.
Careful attention to the default
parameters,
and
how
they
may
or
may
not apply to the line printer
you
are
using is important.
For
example:
The
Option
1 application
firmware
puts 0.02
(20msec)
into the value
for
NLDLY,
which
is the delay
that
comes
after
transmitting
an
EOL
(End
of Line).
Printers
such
as
the Tektronix
4641
require
somewhat
longer delays to
insure
that
the carriage
has
sufficient
time to return.
In
the
4641's case, a delay of
about
200msec
is
desirable.
In
order to
institute
this
delay
as
a
matter of routine
power-up
initiatization,
a
small
"patch
program"
for the
"START.BAS"
program
can
be
written
as
shown
in
diagram
on
the following page.
Line
1060
sets
up
several parameters
should a printer get selected
as
the
output device.
The
variable "I"
defines the desired delay
as
a
function of
baud
rate
(BR).
By
setting
I equal to
600/BR,
a delay of
250msec
(assuming
BR=2400)
will
be
set
(ARTICLE
CONTINUED
ON
THE
NEXT
PAGE)
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