Revox B150 Service Manual

5TUDER R^OX
B250/B250-S/B150
E2/5
2.5.5
MICROCOMPUTER
BOftRD
Unfasten
the
screws
<37)
Starting
-from
the
outside
of
the
chassis,
consecutively
pry
away
all
plastic
clips
<-j3)
from the
circuit
board so
that it
can
eventually
be
lifted
off.
[38]
[37]
Fig.2.11
Important!
After
the
board
has
been
reinstalled
make
sure
that it
is
firmly
seated.
An
LC
display
that
indicates
only
weakly
or
nothing
at all
means
that
this is
no
longer
the
case.
ijL.7-^.jL2:IlS.jLSl.
The
following
processors
are
used:
B250
B250-S
to
No.
5300
from
No.
5301
from No.
100001
(IC 2)
1.725.290.05
1.725.295.05
Input/Output
(IC 1)
1.725.290.07
1.725.290.08
If the
1.725.29D.05
is
replaced
by a
1.725.295.05,
the
connection to
pin
19
ICl must
be
interrupted.
In
addition
the
following
equipment
functions must
be
reprogrammed;
-
Sensitivity
nominal,
store
-
Ma>!.
volume,
store
-
Set
balance to
center
position
-
Set
bass
and treble
to
center
position
If the
input/output
processor
is
replaced by
the
version 1.725.290.05,
also
the
equipment
processor
must
be
replaced by
a
type
1.725.295.05.
For
operation
with
the B200
controller
the
amplifier
must be
equipped
with
the
processors
for B250
amplifiers
starting
with
serial
number
5301.
For
amplifiers up
to
serial
number
5300 the
rating of
resistor R7B
must be
lowered
from
3.3
kohm
to 1.8
kohm
<microcomputer
board)
or
a
3.9
kohm
resistor
should
be
soldered in
parallel
to
R7S.
2_...5j.,_4:
_KBjy.s
The
microcomputer
board
of
the
front
panel
must
be
removed.
Only
for
the
upper
metallic
keys
is a
tool
required
-for
removing
them
from
the
operating
chassis;
Lift
off
the
corresponding
rubber
switch
mat.
Introduce
a
screwdriver
perpendicularly
into
one
slot
of
the
desired
key.
Now
carefully
tilt the
screwdriver
away
from
the
-to
be
removed.
The key
comes
lose and
drops
out
completely
after
this
procedure
has
been
repeated
with
the
second
slot.
2_..5._5
Glas
s
p
an
els
Remove
the
MICROCOMPUTER
board.
Remove
the
two
circlips
(39)
of
the glass
panel
to
be
removed.
Remove
the
glass
panel
together
with the
circlips
from
the
front.
Important!
Do not
press
against the
glass
panel
visible
from
the
inside.
This
is not
an
additional
glass
panel
but
the
LC
display
as
well
as
a
protection
and
filter
glass
of the
VF
display!
When
inserting
a
new
panel
make
sure
that
the
rubber
rings
of
the
circlips
are also
installed.
2_..5_,,6
QELer.atJ.na_XhaLSS
» Remove
the
two
glass
panels
and
the
microcomputer
board.
Set
the
front
panel
on a
soft
base.
Separate
the
operating
chassis
from
the
front
section
(24)
by
unfastening
the six
mounting
screws
(41).
[41]
Fig.2.12

Revox B150 Specifications

General

Brand	Revox
Model	B150
Category	Amplifier
Language	English