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• •
NOTE
:
If
you
cannot obtain a Frequency Selective
Voltmeter :
Adjust
RV
1
,
on the MST card for
8.5 Vp
-
p
for
glass
diodes
or 11.5 Vp
-
p
for silver
epoxy
diodes
.
Skip
all
subsequent
STEPs marked with
an asterisk
tt
g
tl
^
•
STEP 6
Load a
degaussed tape on
the unit
.
Adjust
the
oscilloscope
time / div to 5 msec and volt / div to 50
mv
.
Press RECORD READY for all channels
.
STEP 7
Monitoring
channel
1 with the
oscilloscope
( via
CAL
OUT or LINE OUT )
,
"
punch
" channel 1 in and out of
RECORD and
adjust
RV 4
on the
CNL for the minimum
LFA
.
STEP 8
*
Set
up
Frequency Selective Voltmeter as follows
:
Resolution Bandwidth
Frequency Span
Input Sensitivity
Scale
Amplitude
Ref Level
AFC
3
Hz
1
kHz
+
10
90 db
Normal
out
Input
a 1 kHz
+
10 db sine
wave
( 510 nWb / m )
on
all
tracks
.
1 evel
.
minute
.
Adjust
Frequency on voltmeter for maximum
Press the AFC button
.
Record tone for 1
STEP
9
*
Turn
signal generator
OFF and
rewind
tape
to the
beginning
of the tone
.
STEP 10
*
Connect Frequency Selective Voltmeter
to
CAL OUT
or
to the
line
output
of channel
#
1
.
STEP 11
*
Put all channels in RECORD
READY
and
press
RECORD
.
STEP 12
* Ensure
depth
of erase of
-
75 db or better
.
Reduce
the Master
Erase ( RV
1 on the MST ) to the minimum
amount needed to achieve Depth of Erase
.
Depth
of
Erase
on Channel 2
.
Check
NOTE
:
Master Erase should NOT be
adjusted
to a level
greater
than the minimum
required
for all tracks
to
satisfy
the
Depth
of Erase
specification
.
STEP 13
»
Re
-
examine the LFA on channel
#
1 and
adjust
CNL
Erase
symmetry
control RV 4 for minimum
LFA
.
Typical
LFA
amplitude
is 75 mv or
less
.
STEP 14
Turn APR
-
5000
OFF
.
r
\
6
-
68
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