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Teac MT-20D-IO - Page 73

Teac MT-20D-IO
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3-7-1
Functions
of
test
points
The
PCBA
Drive
Control
and
PCBA
Interface
Control
are
provided
with
the
following
test
points
to
facilitate
observing
the
waveforms
required
during
MTU
adjustment
and
test.
(1)
TPl
(GND)
PCBA
Drive
Control
This
point
is
connected
to
0 V.
(2)
TP3
(output
of
read
preamplifier)
PCBA
Drive
Control
Test
point
for
measuring
the
output
of
the
read
preamplifier.
TP3
is
used
to
adjust
the
level
of
the
read
preamplifier"
,and
check
the
various
characteristics
of
the
head
Ass'y,
etc.
Signal
level:
200
to
600
mVp-p
Fig.
337
Example
of
waveform
at
TP1
(3)
TP4
(6
V
bias)
PCBA
Drive
Control
This
test
point
is
connected
to
the
6 V
bias
power
supply
generated
within
MTU.
TP4
is
used
to
measure
the
various
characteristics
by
using
SOA
(Simulator
OA).
(4)
TP5
(AGC
output)
PCBA
Drive
Control
Test
point
for
measuring
the
output
of
the
AGC
amplifier.
TP5
is
used
to
check
the
operation
of
the
AGe
amplifier.
Since
TP5
is
a
test
point
used
during
manufacturing
of
MTU,
it
is
not
used
for
maintenance
usually.
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361
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