TANDBERG 64 series User Manual

lor
channel 1.
rcul
Tandberg
rterminal. The
3h
level
inputs
rcording A-test
ith
the
operat-
on) at 7tlu
i.p.s.
ding tape.
il the readings
the
playback
ith a distortion
/
(B-test
CHl).
until the read-
h
the
distortion
/
(B-test
CH2).
until
the
read-
ntil
the electro-
rminal
and
pro-
tve in
stereo B-
(CH2)
until
the
.5 V.
Make
sure
are set to
max.
(stereo
A-test)
rtput meters
still
)n8e.
recording
B-test
,p.s.
tape
speed,
I
tape
inserted.
5-10
times
be-
ished.)
rut
terminal.
The
r
Hl-level
inputs
r to
400 c/s
and
Inerator
30
dB
readings
on the
e
points.
Check
ds according
to
20
000 c/s)
15
000 c/s)
9 000
c/s)
r two
channels
ency.
response is too
iH2)
for
7t/zi.p.s.
or 7?e i.p.s
until
ed.
amplifiers.
stand up to the
tolerances
given
above, one
should check
the
play-
back
and
record
amplifiers.
8.1.1
The
playback
amplifier:
Insert
a
100
ohm resistor
in
series with
the
playback
head for
the upper
track
(CH1)
to
ground
(red
wire).
Connect
a signal
generator
across the resistor.
De-
press
the
push-button
lV
(monaural
plaback
CH1)
and
set the
operating
lever
to normal
forward
drive with
the
playback
volume
control to
maximum.
The
signal
generator
is
tuned
to
400 c/s with
an
output level
of
2
mV. The
reading
on the
output
meter is
the
0 dB
reference
point,
at 7tlz i.p.s. tape
speed.
Check the
frequency
response
according to
fig.
6.
Repeat
the measurements
for the lower
track
(CH2).
The
oulput
tolerance
is
-+2
dB
for
all
frequencies.
The
difference
in level
between
the two
channels
should
be maximum
3 dB at
any frequency.
8.'1.2 The
record
amplifier.
Insert a
1000
ohm
resistor in
series
with the
record
head for
upper
track
(CHl)
to
ground
(black
wire).
Connect
a V.T.V.M.
across the
resistor. The
signal
generator
is
connected to
the Hl-level
input
of
CH1.
Depress
the
push-button
|
(monaural
recording
CH1)
and
set the
operating
lever
to
normal forward
drive.
Tune the
signal
generator
to 400
c/s
and
set
the
output
from
the
generator
30 dB below
maximum
recording
level.
The reading
on the
output
meter is
the
0 dB reference
point.
Check
the frequency
res-
ponse
according
to
lig.
5.
Repeat
the
measurements
for
the
lower
track
(CH2).
The
output tblerance
is
-+2
dB
for
all frequencies.
The
ditference
in level
between the
two
channels
should
be less than
3 dB
at
any trequency.
9.0 Adjustment
ol the FM-muttiptex
titter.
Feed
a 19 000
c/s
signal to
both FM-MX inputs
and
depress the
push-buttons
I and ll.
Set the
S-on-S
switch to
A-B test
and the
playback
volume
controls
to
maximum.
The recording
gain
controls
should be
set
to
maximum
recording level.
Connect
a V.T.V.M.
to
each
cathode
follower
output.
Adjust the
core
of
L4
(CH1)
and L5
(CH2)
for minimum
reading
on
the
output
meters.
10.0
Adiustment
ot the microswitches.
The
bias is
reduced
in
17e i.p.s.
tape
speed
to
obtain
correct
frequency
response.
The microswitches
(Ret.
fig. 2
and 4) is
introduced
in the
bias
regulating
circuits
and
activate
the
potentiometers
R
607
(CH1)
and R
610
(CH2)
in
17/e
i.p.s.
tape
speed
onty.
The
microswitches
are
located
at the
rear
of the recor-
der, ref.
fig.
4.
Set the
speed
selector
to 17e
i.p.s.
and loosen
the
two
screws holding
the microswitch
bracket. More
the bracket
slowly towards
the
activating
arm until
the
switches
operate
and tighten
the
two
screws.
Check the.
adjustment
by moving
the speed
selector
knob
slowly
lrom
17/e
to 33/+ i.p.s.
and back.
The
switches
shall now
operate
properly.
RECORD
HEAD
FIXING
SCREW FOR
HORIZONTAL
AOJ.
PLAY
BACK
HEAD
ERASE
HEAD
Fig. 1.
The
tape
path,
with
location
of the
bias head.
HEIGH T ADJ.
SCREW

TANDBERG 64 series Specifications

General

Brand	TANDBERG
Model	64 series
Category	Voice Recorder
Language	English