Sony APR-5001 Series Operation And Maintenance Manual page 21

APR - 5000 ADDENDUM
b
.
Set the
machine power switch to OFF and then
back to ON
.
device to be more closely tailored to a
wide
range
of Master devices ,
covering
a significant latitude of
starting
ballistics as well as starting / stopping
reproduce performances
.
c
.
If the
"
E 004
"
message
remains , a manual read -
justment of the V - F converter may be necessary
.
( Refer to the
APR - 5000
Operation and
Maintenance
manual
,
Section 6.5
.
16 )
.
This
can
be
confirmed
by listening for substantial pitch
changes in
program
material when switching
between fixed
speed
,
and vari - speed operation
at 00.0 %
The Acceleration Allowance can be entered into
Storage Location 50 ,
the maximum argument for this
preset being one Frame less
than 2 seconds
,
i
. e 1 : 29
for
SMPTE or 1 : 24 for EBU . If any presets
exceeding
these are entered ,
they will be truncated
to the max -
imum allowable value
.
Once entered , the Acceleration
Allowance is retained through power - down and
will remain in effect until either changed by the
user or disabled
.
It
should be noted that , where the new firmware is
installed on machines previously used with earlier
firmware
revisions , this also may cause the " E 004 "
message to
appear
on initial power - up
.
1
The Acceleration Allowance is disabled by storing a
0 : 00 in memory location
50
.
While disabled
,
the
machine will use default values of 18 frames for
the 7.5 and 15 ips speeds , or 19 frames for the 30
ips speed
.
Should significant hardware
problems exist in the
V - F
circuit , this diagnostic may not
provide
a
consistently
reliable indication
.
If difficulties remain ,
the need for
a
hardware service check is indicated .
In a
related enhancement
, a received external LTC
( Longitudinal Time Code ) reference , which con -
tinuously repeats the same Time Code Frame Data
,
now causes the
APR - 5003
to locate to the Accelera
-
tion Allowance ( as described above ) in advance of the
time currently being received
.
With
previous
firm -
ware
,
the machine considered this code to be in error
and reverted to tracking the received sync words
.
When this firmware version is installed in other than
Time Code configured machines , this diagnostic is in -
operative
.
In these machines , a
fourth diagnostic
display count on power - up has no significance
.
4.6 TIME CODE OUTPUT
DURING TIME CODE RECORD
4.8 TIME CODE OUTPUT OPTIONS
The Time Code output from the
APR - 5003
was
previously coincident with the advanced Time Code
head
.
However , difficulties arose
when using this
output to record Time Code simultaneously on
another device
.
This operation would result in an
off -
set between the two devices , the offset being equal
to the delay time between the Time Code and Audio
Record heads
.
Three mutually exclusive modes of supplying
Time Code during High Speed Wind modes now
are
provided
.
4.8
.
1 Direct Time Code from Tape
This mode is invoked by setting Storage Locations 35
and 36 to 0
,
and is primarily intended for use when
the APR
-
5003 is
controlled by external synchronizers
.
Many of these devices read Time Code directly at
moderate speeds
,
and
,
where conditions prohibit Time
Code validation
,
they default to tape tach and direc
-
tion outputs
.
This function
was available with
previous
firmware
.
Time Code
can now be
striped simultaneously
on
any other longitudinally corrected
device without
the need for a
subsequent OFFSET adjustment to
achieve
synchronization
.
This holds true for Time
Code from the internal generator , as
well as any ex -
ternal Time Code which may be '
' daisy chained "
through the machine
.
4.8
.
2 Wind Speed Limit
4.7 CHASE POSITIONING OPTIMIZATION
Intended primarily for use when the
APR - 5003
is us -
ed as a Master ,
this mode
,
which is invoked by setting
Storage Location
36 to 1 , was available in
previous
firmware revisions
.
It
provides
a means of limiting the
maximum wind speed in such
a manner that simple
,
Time Code - only , CHASE
synchronizers
are able to
follow the APR
-
5000
.
During
CHASE
operation , parking the APR - 5003 to a
stopped Master position is now user - adjustable by
means of the
' Acceleration Allowance "
.
This Accelera -
tion Allowance is the distance in advance of the stop -
ped
Master device at which the
transport positions
itself in CHASE mode
. Its use
allows the Slave
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