STUDER REVOX PR99 Bedienungsanleitung Seite 39

TECHNICAL SUPPLEMENT
CARE
AND MAINTENANCE OFTHE
REVOX PR99
The maintenance
work
is reduced
to
cleaning and demagne-
tizing the tape guidance
elements.
Note:
During the cleaning, take care
that
no cleaner
comes into
the bearing of the capstan
axle.
The
tape guides should
be
cleaned prior to each recording
be-
cause
contaminants
can cause
recording gaps
or so-called
d
rop
outs.
For
optimum
cleaning use
the
Revox
cleaning set (order code
39000). lt
contains all utensils necessary
for cleaning the ma-
chine and a
special cleaning fluid.
Lubrification
of the
sintered bearing bushes
and of the
ball
bearing
is
described
in
the service instructions.
Procedure
Dip
a
felt swab into the cleaning
fluid
and clean
alltape guidance
elements. Dry the cleaned surfaces with
a
new
dry felt swab.
Demagnetizing
After
approx. every 100
hours
of
operation
(or prior
to
a
record-
ing). demagnetize the soundheads and tape
guidance
elements.
Use a
demagnetizer (order
no. 10.042002.01)
Procedure
(Tape deck switched off.
no
tape
on
the spindles). Slowly bring
the
tip
of the
demagnetizer
in
close proximity
to the component
to
be demagnetized.
After a
few
seconds, retract
the
choke
slowly. This
procedure should
be repeated for alltape
guidance
elements
and
heads
shown in the corresponding
illustration.
The demagnetizer can be switched of
in a distance of approx.
50
cm
(20")
CALIBRATION
AND
RECALIBRATION
OF
THE REVOX PR99
General
The adjustments based on NAB or
CCIR
test tapes are different
in
the
following
details:
NAB:
Operational
level approx.
6
dB
below peak
recording
level.
The intensity of magnetization is
250 nWb/m
and
500
nWb/m
at
peak recording
level. The
machine
is
fac-
tory-adlusted to these
values.
CCIR:
Reference level
+peak
recording
level.
Magnetizing
force is (factory
adjusted) 51OnWb/m.
To
simplify the instructions, the reference
is
the operating le-
vel
(o0VU
resp.
6
dB
below
peak recording
level).
Calibration of input circuit:
1.
Remove machine
from housing (case) (undo 4 screws
on
back of unit).
2.
ConnectAF
millivoltmeterto
monitor connector pin 3 (CH1)
/
pin 5
(CH2)
and pin 2
(GND).
3.
With
AF
generator, apply
1
kHz
signal
of
desired
operating
le-
vel for
0VU.
4.
Switch on machine.
5.
Release
UNCAL button
[21]
and SYNC button
[31]
6.
Set OUTPUT
switch [20] to the INPUT/
SYNC
position.
7.
Adjust monitor output
Io
0.775V
with potentiometer
RB
(CH1)
or R16
(CH2)
respectively
(PCB LINE INPUT CIRCUIT)
B
The sensitivity can be increased
for small levels by replug-
ging
lumpers
S
1/S2. located behind
potentiometers
RB/Rl6,
to position A or
B
(sequence
viewed from
potentiometers:
CBA)
9.
Switch machine off and reinstall
in housing.
ORIGI
NAL
REVOX ACCESSORIES
PR99 MIC
INPUT BALANCED
(Retrofit
kit)
Remote control unit,
incl.
10
m cable
Capstan motor.control
-F7
semitones
Tool
set
PR99
NAB adapter (black)
NAB
adapter (professional)
AEG flange
for
single sided spool
(horizontal operation
only)
Cleaning
set
Demagnetizing
choke
Revox
microphone M3500
Revox
headphones
RH310
14
Order code:
1
.177.885
34227
?L)2-7
20.020.00110
45001
4501 0
34501
39000
10.042.002.01
30450
3201 0