^
TANDBERG
TCD
34OA-
Circuit
A
Mechanical
gnrn
li
adjustments,
DagraTs
en
see
tTn
Service
Manual
st
r
u
for
TCD
wrth
cti
330,
o
n
Ordering
s
No.
714021
Electrical
adjustments
for
the
TCD
3404
General
Before
adjusting,
tape path must be cleaned
the
and demagnetized. It is
path is
manual
Carry
correctly adjusted, consult the service
for
out
TCD
the
adjustments
the
330, part
because the adjustments
the top
Equipment
-
-
-
-
-
-
-
panel, base
panel,
required
volt
2
meters
Audio
Frequency
signal
counter
generator
Distortion meter
Wow
Tandberg
-
No.
- No.
-
No.
-
No.
flutter
and
meter
test cassettes
(Speed check, 1000 Hz)
21
(Wow
22
23
24
and
(Azimuth
(Playback
Measuring cassettes
-
Maxell
Maxell
-
UD
UD
I (Type I)
XL
Il
XL
flutter
adj. playb. head, 6300 Hz)
level
(Type
necessary
No.
order described
in the
affect
each other.
right side
and
check, 3150 Hz)
adj., 1000 Hz)
II)
that the tape
714021.
Remove
panel.
Oscillator
The
oscillator
The
voltage
between
Sensitivity
- Set
the Monitor
Input and Output Level
-
Apply
80
or
from
-
Adjust the
obtain 77 5 mY measured on a voltme
to
nected
Figure
see
Move
output,
- Adjust
R218
-
Check the
frequency
is
between
measured on the erase
and 32 volts.
25
adiustment
button to Source position,
controls
8mV,1000
mV,l000
Hz
Hz to the INPUT sockets
the audio signal
to the
generator.
RADIO socket
SENSITIVITY ADJ. pots. Rl01-R201
to the
Dolby
encoder output,
1.
measure
the
Figure
see
SOURCE
the
to obtain 7 7 5
probe
to the
2.
LEVEL ADJ. pots.
mV
.
frequency response in
80 and
head should
100
kHz.
be
and
maximum.
to
(DIN)
(Phono)
con-
ter
Dolby decoder
Rl18-
Source.
Before adjusting,
MPX-FILTER (situated
OFF.
to
-
Dolby
-
Tape to
-
Output Level
*
The word
of Dolby
NR stands
NR*
Type
"Dolby" is registered trade marh
Laboratories
for
the
set
to Off.
I.
controls to
l'{oise Reduction.
buttons
to:
at the back of the deck)
max.
USA.
Inc.,
Dolby
Right channel meas.point
RroBP I Prosr.
L
|
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J-
- - -l
R2oq Ra
REc LEV€L aoJ TYPE
_
.:.,
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REc METER
R2rg R RrrB
aori*aa a?ura
encoder output
T'Pf
I TAPI
agrog
!
tl TAPE
Left channel
meas.point
Figure
1 Trimming
TRIMMING
pots.
POIS
MAIN AOARD SE€N FAOM SOLOER
ON
and Dolby
SIDE
encoder rneasurement
points
Left channel
Or measure
Dolby decoder outpul
point
meas,
on 81303
Right
channel meas.
Or measure on
R1403
point
Azimuth
-
Use Maxell UD XL I or an
and
height,
record head
equivalent
tape.
-
Applf'
channels.
-
Set the
voltmeter to the OUTPUT sockets both
Figure
..
^O
2 Dolby
decoder measurern,ent points
Playback, azimuth
Playback, height
Record,
azimuth
o^v^
^Va
.J n.':
\
-v/-
o<-o
i^
Figure
3 Adjustments
Azimuth adjustment,
Record, height
the heads
for
playback
head
channels.
-
Press
the
head height
amounts
the maximum reading
OUTPUT
-
Adjust the azimuth (10
alternatively,
-
Azimuth
control oscillator
NOTE! The
by
equal amounts
lelism does
Overall
frequency response with Type
Hz
1000
Monitor
Record
screws shown
(the
sockets, or
can also be adjusted
record height screws
not change.
the INPUT
to
button to Tape and connect
button
same number of
on
the best compromise.
until the head sits correctly.
(10 kHz).
ensure
to
sockcts
and
turn the two record
Figure
in
degrees) to obtain
both
channels
kHz)
and the
with
must be adjusted
that the
both
3 by equal
of the
height
built-in
the
head paral-
I Tape
(bias)
a
Insert a Tandberg
standard azimuth
- Set the
Monitor button
voltmeter to
test cassette
cassette.
each
channel of
to
No.
Tape
and connect a
the OUTPUT
23
sockets.
Press
azimuth screws
the
Play
button.
shown in
Adjust the playback
Figure
3
to
maximum reading on each channel.
Playback
- Insert
Connect
Dolby
level
test cassette
No.
a voltmeter to
decoder output
24.
each
shown
channel
in Figure
- Adjust the PLAYBACK LEVEL pots.
until
you
read 775 mV
playback
R219
Level meter adjustment,
-
Insert Tandberg test cassette No.
on
each
24.
or a
obtain
of
the
2.
Rl19
and
channel.
-
Set the
- Apply
of the
- Re duce the
or reduce
Input Level controls.
- Press
ADJ. TYPE I TAPE, C1502 and Cl602 to
maximum reading at the
- Sweep the audio
quency
is correct.
- If necessary,
C1602
30 to 18000
Monitor button to
1000 Hz
inputs.
the
range
to
-'.\
from
level at the signal
level
the
Record button, and adjust
obtain
by a similar
generator
and check
adjust
the correct
Hz.
Tape.
signal generator to one
the
generator by 35 dB
amount on the
outputs.
throush the
that
the curve with C1502 and
response
the
response,
the BIAS
obtain
full fre-
curve
t
dB,
3
When the playback
meter to 0
dB with
and R214.
level is
correct, adjust the
PLAYBACK
METER Rl14
level
Bias adjustments
^
Adjusting
Type
- Use
ment
- Adjust
REC. LEVEL
obtain the
on
Then depress
the
Overall
-
Use
-
Insert a Maxell UD
- Set the
press
-
check
adjust the
Rl
the record
I Tape
same input
the
(- 35 dB)
the record current
same output
Monitor
the
overall
the
508
frequency response.
frequency response
same
Tape button
Record
the
the frequency response, and if
BIAS ADJ. TYPE II TAPE, pot.
to obtain the correct
current
level as
and
ADJ. pots. Rl08
butron.
the Dolby
procedure as
XL
button.
(Source/Tape)
for
1000 Hz.
by
level
NR
button and check
with Type ll Tape
for
II or an
Type
to
bias adjust-
the
means
for both
response.
of
the
R208
and
positions
Type I
the
cquivalent tape.
position,
II
necessary,
to
(bias)
tape.
and
Distortion
Record 1000
The max. distortion for
Erase
test
Connect a microphone
record an
overload
the overload signal cannot be
imuth
Az
-
the
Set
-
Set the Output
- Insert
-
Adjust
ff.or:"r:t-"tely
_
Check also that the meter
Type II
Hz
at 0 dB
overload signal. Record again
recording
meter
adjustment
oscillator
Level
(AZIMUTH METER
-
within
built-in
aType I tape and
p.Z2Z
tape is
deflection on
record/playback
to the TCD 3404 and
and play
controls
press
3
dB deflection on the right
the meter
back to
heard.
ON.
to
maximum.
to
the
deflection
scale.
the meters.
is 3%.
erase
to
ensure
Record
button.
ADJ.)
with a
I
\
the
that
c
/
to
Adjusting the
Type ll Tape
- Use the
ment
-
Adjust the record current by means of
LEVEL ADJ. pots
same output
Monitor
R1101 and
frequency region 15-18 kHz on the playback
the
curve forall types of
Level
meters
-
Set the Monitor button to Tape'
-
Apply
channels)'
Press
Level
OL-rTPI-IT
record current
same input
(-
dB)
35
button.
R1201 affect the treble
adjustment,
1000 Hz
Record button and adjust the
the
controls
sockets.
level
and
Rl09
for
level
the INPUT
to
for 1.5 volt ,.uiing on
(Source/Tape)
as for the bias adjust-
1000IIz.
R209
and
both positions on
tapes.
record
to
response
sockets
REC.
the
obtain
the
(both
Input
thi
the
in
Speed
Play
check
counter
<!
Wow
Play
(3150
meter
weighted RMS: ( 0.09%
Weighted Peak
Record/prayback
flutter
weighted RMS:
check
back Tandberg
1000 Hz)
on the
(995
03%
and flutter
back a Tandberg test cassette No.
Hz)
on the OUTPUT sockets:
Record
frequency
from a generator 31b0 Hz
meter on the OUTPUT sockets.
and measure with a frequency
OUTPUT sockets:
1005 Hz).
to
measure with
and
DIN 45511 10.2%
.or,ni., and measure
(
0'12%
cassette
test
No.
21
a wow
and
(check
with the wow
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22
flutter
with
and
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to
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REC. METER pots.
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IN OHMS.
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2-eaue
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Part No.714092
-78
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