3.
Buffer meter calibration: Another trimmer
on the
keyboard
PCB controls
the buffer meter
calibration. Press SHIFT/SPACE(bar)
to
place
the
unit
in a
preload position.
Then
type
keys
at random
until the buffer
fills and the DVERFLDN NARNING
lamp
lights.
Hit three more
keys
to
completely
fill the
buffer,
then
adjust
the trimmer marked
"b"
on
the
keyboard
PCB until
the buffer meter
indicates "I00". Press
the SYSTEM RESET to reset the
unit. Note that this
trimmer is also
accessible from the
top
or bottom of
the PCB.
I bl CIKXESEE EJF7 I I F7F='I CZLJL_1'\’-
- - - - - - - - _ - - _ _
Field trouble
shooting
is best
accomplished by
substitution of
IC‘s based on an educated
guess
of
possibility.
Or
just
blind
substitution if
no
localization can be made. The
only component
not available in the field is the EPRDH which
must be ordered from
the
factory.
The B044
may
also be
obtained from the
Factory.
D4
course,
any component may
be ordered from us if
desired.
If
you
can’t locate the
problem,
call or
write us for
help.
we'll
suggest
the
best
way
to
proceed, possibly
requiring
the return of the
unit.
L. IP4 I'TEEI) UJ€§F?F?£§hJ1'\(_ - -
- - - - - - _ -
- - - - - - - - -
He will
repair any
defect caused
by components
or
workmanship
without
charge
for labor or materials for a
period
of 90
days
after
you
receive
the unit. You will be
responsible
for
shipping
both
ways
from our
factory.
After 90
days,
we can
quote
the estimated
repair
cost after
examining
the unit
according
to
prevailing wage
and
material costs.
Although complicated
in
Function,
the KB—4900 is
quite
simple
in
execution so
repairs
should not
be too difficult. In
addition,
all lC’s are
socketed for
ease of
servicing.
The one
event which ruins a lot
of amateur
equipment
is the
electrical storm.
This sometimes turns
part
of the
circuitry
into soot
and
invariably
burns out
every
semiconductor. If not too
severe,
we can
sometimes
repair
the
unit
at an
acceptable
cost. In
any event,
see
if
your
homeowner’s insurance
covers such
things
so
you
can
easier
decide what
you
can bear. The best
insurance
against
electrical
damage
is to
disconnect the ac
power
from the
station
completely
(Pull the
main
plug,
don’t
depend
on
the switch) and
ground
and
disconnect
your
antennae from
your
equipment.
F’F?(3(3F?¢§r4
C:F1£\PJC5EEE3 FNPJI)
F?EE\J I 53 I
CJPJES - - - - - -
The
program
in
your
KB-4900 is
contained in an EPRGH.
This device can
be
erased
with
ultraeviolet
light
and
reprogrammed quite
easily.
If
we
make
product updates
of the
program,
we will
correspond
with
you
to ascertain
if
you
desire
the
update.
If the
update
is a
correction o6 a
problem,
the
only
cost would
normally
be a
small
mailing charge.
If
the
update
is
a
signiicant
improvement,
there
may
be some
reasonable
charge
depending
on the
nature of the
change.
You
may change
the (socketed)
EPRDH
yourself
or if
you
don’t
feel
up
to
it, you
can
always
have
us do it. The
only
difficulty
is
inserting
the
device into the
24
pin
socket without
mashing
the
pins.
Otherwise,
it’s a five
minute
job.
CURTIS ELECTRD
DEVICES, lnc.,
Box
4090,
Mountain
View,
CA
94040
Tele: 415 494
7223 TNX: 910 373 2017
Cable:
CURTIS,
PALD
ALTO,
CA
Shipping
address: 4140
Transport
Ave.,
Palo
Alto,
California
94303
(16)
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