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Md
7. MEASUREMENT
AND
ADJUSTMENT
-ELECTRICAL-
GENERAL
NOTICE
Before
performing
any
maintenance
on
this
unit,
all
metal
parts
that
the
tape
will
come
into
contact
with
must
be
cleaned
and
demagnetized.
It
is
important
that
the
unit
is
set
for
the
proper
voltage
and frequency
for your
locality.
Standard
test
tapes
and
test
equipment
must
be
used
when
per
forming
maintenance
to
insure
reliable
results.
Procedures
for
checks
and
adjustments,
unless
otherwise
indi-
cated,
are
for the left channel
at 7~1/2ips.
The same
pro-
cedures
are
to be applied
to the right channel
and the other
tape speeds.
All controls
mentioned
in this book will be. printed
in bold
letters
and will
be exactly as they appear
on the unit.
Double
designated
symbol numbers
refer to left
channel/right
channel.
THD:
Yhird
harmonic
distortion.
Value of "dB" in the text
refers
to 0dB=0.775V,
except
where
specified.
If a level meter or an AC VIVM calibrated
to 0dB
=1V is to be used,
appropriate
compensation
should be made
by adding
approximately
2 dB.
When
not
using
the
TEAC
test
set
M-826A,
connect
a 10 kn
load
across
the OUTPUT
jacks
to assure
that 0dB=0.775V
with
the
VIVM.
POWER
SUPPLY CIRCUIT
CHECK
Measure
DC
voltage
of
rectifier
circuit
at R-309
for approximately
23
volts.
If
proper
voltage
is
not
present,
adjust
VR~304.
71
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