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Erase
head (15B)
should
be so positioned
that
its
face
ia
parallel
with
the
holes in mounting
bracket
(15C)
andparallel
to the
tape.
The
vertical
height
of the
head
should
be
0.584",
measured
from
the mounting
bra-
cket
to the
top
of
tle
erase head
gap. If
the
head
is
too
high,
the
recording
may not be erased
completely;
if
the
head
is
too low, part
of the
lower
track
may
be
erased.
Record-Playback
Head
l.
Threadastandardfrequency
tape (RCA 12-5-
61T
or equivalent)
on
the
tape
recorder.
Con-
nect output
meter acrosg
left-channel
speaker
lead
terminals.
2.
Record-playbackhead(i5A)
shouldbe so pos-
itionedthatthe front
of the head
is
parallel
to the
edge
of
mountlng
bracket
(l5C).
3. Adjust right-hand tape
guide
post
(18)
for
maximum
output
while
playlngthe
1,000-cycle
portion
of the tape.
Adjust left-hand
tape
gutde
post
(18) so
that
the
tape
is approximate
-
lylevel
across
front
of
head.
Repeat
right-
hand
tape guide
post
(18)
adjustment.
4.
AdJust
right-handhead
mounting
screw
(15R)
for
maximum
output.
Left-hand
head
mount-
ing screw
(l5L) must
be
tight.
Recording Level
I
ndicator
Recording level settings are
obtained
by
two neon
bulbs, Type NE-51. .Adjustment
of
tlrese
bulbs are
necessaryonlywhenthe
bulbs
or
components
in
these
circuitsarereplaced. Thefiringlevelon
the
record-
ing indicator
is
adjusted by means of
two
adjustable
controls
(R3)
and
(R4).
The
controls
are
accessible
aJter
tlte
cabinet bottom
cover
1g
removed.
To
adjust
firing level
of recording
indicators,
the mechanism
must
be
in
the
cabinet. Refer
to
Fig.
3
for
location of
adjustments.
l.
Connectan audio
signal generator to the
ra-
dio-Phono
jack.
Set
generator frequencyto
approximately
l,
000
cycles.
2.
Connect
a
VTVM to teet point TP-3.
3.
Depress Monitor
push button.
4.
Ground
test point
TP-I.
Adjust generator
output and,/or
tape
recorderLoudness
con-
trolto
provide approximately
2.
3
volts rms
reading
on
the
VTVM.
ELECTR
ICAL
ADJU
STMENTS
5.
Bemove ground
from test point
TP-l
and
ad-
justNormal lndicator control
(Ra)
by
turning
counterclockwise and
then clockwise until
the
Normal
neon
bulb
barely lights.
6.
Ground
test
point
TP-I.
Adjust
generator
output
andr/
or
tape
recorder
Loudness
control
toprovide approximately
6. 8
volts rms read-
ing
on
the
VTVM.
7.
Remove ground
from
test point
TP-l
andad-
just
Overload
indicator control
(R3)
byturn-
ing
counterclockwise and
tlen
clockwise
until the
Overload
neon
bulb barely
lights.
Gain Control
Gain
control
(R5) enablesthe
volume
levelof
the
external
speakers
to be
equallzed
with
the
volume level
of the
internal
speakers.
To
set the
gain control:
1. Thread
a
standard
frequency tape
on
the re-
corder.
2.
Connectanoutputmeter across
the
terminalg
of the
left
channel
speaker contained
in
the
recorder.
3. Turn
on
recorder
and allow to warm
up
for
geveral
minutes.
Set
volume
control at
nor-
mal
playrng
position. Set switch (M9)
to
Stereo-Single.
4.
Depress
the
Stereo and
Play
push
buttons
and, while playing
the
1,000-cyclepartof
the
tape, note the
output
meter
reading.
5.
Depress Stop
bar
and reverse
tape
reels to
turn
tape upside
down.
6.
Disconnect
the output
meter from the re-
corder
and
connect
to
the terminal
of
right
channel
speaker contained
in the
companion
speaker
unit.
7.
Depress
the Stereo
and Play push
buttons
and,
while playing
the
l,000-cycle
part
of
the
tape,
note the output
meter
reading.
8. Adjust gain
control
(Rb)
to
obtain the same
indicatlon on
the
output meter
as
$/as
noted
in
Step
?.
For locationofgaincontrol,
refer
to Fig.
B.
t/r-
P'3
,.6
<
u!a
-lJ
PO
a-
A=
ro
PH
UIF
LUI
$F
--6
la
ata
dt"
\@
TT
o
a-
(D
l\t
TP-I^
osc (D
,?0,
tl'i3o
TP
-
3Ci)
AUD
IO-
OVER-LOAD
NORMAL
ee
RECORDING
INDICATOR
A
RIGHT CHAN.
-
GAtN
EQUALtzER
FIG.
3
AMPLIFIER
ADJUSTMENTS
Page
5
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