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RV
2
• o
'
c : : :
(
Ground
)
TP
3
CMISS
R
22
Figure 6
-
13
.
DVM
Connection to the
HMD
Board
6.5
.
6.2
RMD DC Offset
Adjustment
Procedure
n
Adjust
RV 2 on
the
RMD board (
refer to
Figure 6
-
12 )
so
that the voltage reading across
R 18
equals +
0.001
volts DC
.
machine
is
in EDIT mode and no tension or reel motor
rotation is
occurring
( refer
to Figure 6
-
12 for DVM
probe attachment points
)
.
STEP 1
This
adjustment
must be made vrhen the
Adjust
RV 4
on the
RMD board ( refer
to Figure 6
-
13
)
so
that the voltage
reading
across R 17
equals +
0.001
volts DC
.
machine is in
EDIT mode
and no tension or reel motor
rotation is
occurring
( refer to
Figure 6
-
13 for
DVM
probe
attachment
points
)
.
STEP 2
This adjustment must be made when the
6.5
.
6.3
RMD Tension
Check Procedure
The
microprocessor
controlled
tape
tension servo
system
feeds
the tension data from a
ROM
table to the motor drive
system
.
The
physics of
tape
tension dictates that the
torque
on the
reels
necessary
to maintain constant
tape
tension will
vary
as
the amount of
tape on
the reels (
tape
mass
radius ) varies
.
The ROM table in the software of the APR
-
5000
is
programmed
to compensate for
this
.
o
6
-
26
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