TANDBERG TCD 340A User manual

TANDBERG
^ TCD
34OA-
Circuit
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Mechanical
adjustments,
see
Service
Manual
for TCD
330,
Ordering
No. 714021

Electrical
adjustments
for the TCD 3404
General
Before
adjusting,
the tapepath mustbe cleaned
and demagnetized.It is necessary that the tape
path is correctly adjusted, consult the service
manual
forthe TCD330,part No. 714021.
Carry
out theadjustments
in theorderdescribed
becausetheadjustments
affect
eachother.Remove
thetop panel,base panel,
and
right side
panel.
Equipment
required
- 2volt meters
- Audio signal
generator
- Frequency
counter
- Distortionmeter
- Wowand
flutter meter
- Tandberg testcassettes
- No.21
(Speedcheck,1000Hz)
- No.22(Wow
and
flutter
check,3150Hz)
- No.23(Azimuth
adj.playb.head,6300Hz)
- No. 24 (Playback
level
adj.,1000Hz)
- Measuringcassettes
- Maxell
UD XL I (TypeI)
- Maxell UD XL Il (Type II)
Beforeadjusting,
set
the buttons to:
- MPX-FILTER (situated at thebackof the deck)
to OFF.
- Dolby NR* to Off.
- Tapeto Type
I.
- Output Level
controlsto max.
* The word "Dolby" is registeredtrade marh
of Dolby Laboratories
Inc., USA.
NR stands
for l'{oiseReduction.
Oscillator
The
oscillator
frequency
is
between
80and
100
kHz.
Thevoltage
measuredon theerase
headshould
be
between
25 and32volts.
Sensitivity
adiustment
- Set
theMonitor button to Sourceposition,
and
Input andOutput Level
controls
to maximum.
- Apply 8mV,1000 Hz to the RADIO socket
(DIN)
or 80mV,l000 Hzto theINPUTsockets
(Phono)
from the audiosignal
generator.
- Adjustthe SENSITIVITYADJ.pots.Rl01-R201
to obtain 775 mY measuredon avoltme tercon-
nected
to theDolby encoderoutput,
see
Figure
1.
- Move
themeasure
probe
to theDolby decoder
output, see
Figure
2.
- Adjust the SOURCE
LEVEL ADJ. pots.
Rl18-
R218
to obtain775 mV .
- Checkthe frequencyresponsein Source.
Dolby encoder output
Rightchannelmeas.point Left channel
meas.point
_ | RroBP I Prosr.
.:.,
P)lI P I RTL LLvtL T'Pf I TAPI
REc METER J- - - -l
R2rg
R RrrBL R2oqRa agrog !
aori*aa a?ura REcLEV€LaoJ TYPE
tl TAPE
TRIMMING POIS ON MAIN AOARD SE€N FAOM SOLOER SIDE
Figure
1 Trimming
pots.
andDolby encoderrneasurement
points

Figure2 Dolby decodermeasurern,entpoints
Playback,azimuth
Playback,height
Record,
azimuth
Record,height
Figure3 Adjustmentsfor the heads
Azimuthadjustment,
playback
head
- Inserta Tandberg test cassette
No. 23 or a
standardazimuth
cassette.
- SettheMonitor button to Tape andconnecta
voltmeter to each channel of the OUTPUT
sockets.
- Press
the Play button. Adjust the playback
azimuth screws
shown in Figure 3 to obtain
maximumreadingon eachchannel.
Playback
level
- Insert
testcassette
No. 24.
- Connect
a voltmeterto each channel
of the
Dolby decoderoutput shown
in Figure
2.
- AdjustthePLAYBACKLEVEL pots.
Rl19 and
R219until you read775mV on each
channel.
Levelmeteradjustment,
playback
- InsertTandbergtestcassetteNo. 24.
Whenthe playback
leveliscorrect,adjustthelevel
meterto 0 dB with PLAYBACKMETER Rl14
andR214.
Azimuth and height,record head
- UseMaxell UD XL I or an equivalent tape.
- Applf' 1000 Hz to the INPUT sockcts both
channels.
- Set the Monitor button to Tape and connect a
voltmeter to the OUTPUT socketsboth
channels.
- Press
the Record button and turn the two record
head height screwsshown in Figure 3 by equal
amounts (the samenumber of degrees)to obtain
the maximum reading on both channels
of the
OUTPUT sockets,or the best compromise.
- Adjust the azimuth (10 kHz) and the height
alternatively, until the head sitscorrectly.
- Azimuth can alsobe adjusted with the built-in
control oscillator(10 kHz).
NOTE! The record height screws
must be adjusted
by equal amounts to ensure that the head paral-
lelism doesnot change.
Overall
frequency responsewith Type I Tape (bias)
- Set the Monitor button to Tape.
- Apply 1000 Hz from the signalgeneratorto one
of the inputs.
- Reducethe levelatthe signal
generatorby 35 dB
or reduce the levelby a similar amount on the
Input Level controls.
- Press
the Record button, and adjust the BIAS
ADJ. TYPE I TAPE, C1502andCl602 to obtain
maximum readingat the outputs.
- Sweep the audio generator throush the full fre-
quency rangeand check that the response
curve
is correct.
- If necessary,
adjust the curve with C1502 and
C1602 to obtain the correctresponse,
t 3 dB,
30 to 18000 Hz.
-'.\
Dolby decoderoutpul
Left channel
meas,
point
Or measure
on 81303 Right
channelmeas.
point
Or measureon R1403
i^
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^Biasadjustments

Adjusting
the record
current(Source/Tape) Distortion
Type I Tape Record1000
Hz at 0 dB deflectionon themeters. I
- Use
the sameinput levelas
for thebiasadjust- The max. distortion for record/playback
is 3%.
ment
(- 35dB)
and
1000Hz.
- Adjust the recordcurrentby means
of the Erase
test
REC.LEVEL ADJ.pots.Rl08 and
R208
to
obtainthesameoutput level
for both positions Connect a microphone to the TCD 3404 and \
on theMonitor butron. recordanoverloadsignal.Recordagain
to erase the
overloadrecordingand play back to ensure
that
- Thendepress
theDolby NR button andcheck the overloadsignalcannotbeheard. c
the overallfrequencyresponse.
Az
imuth meter
adjustment
Overall
frequencyresponse
with Type ll Tape
(bias) - Set
thebuilt-in oscillator
to ON.
- Use
thesame
procedureas
for theTypeI tape. - SettheOutput Level
controls
to maximum.
- Insert
aMaxellUD XL II or ancquivalenttape. - Insert
aTypeI tapeand
press
theRecord button.
- Setthe Tapebutton to Type II position,and /
press
the Record
button. - Adjust p.Z2Z
(AZIMUTH METER ADJ.) to
- check the frequencyresponse,andif necessary, ff.or:"r:t-"tely - 3 dB deflection on the right
adjustthe BIAS ADJ. TYPE II TAPE, pot.
Rl 508
to obtainthecorrect
response. _ Checkalsothat the meterdeflection
with a
Type II tapeis within themeter
scale.
Adjustingtherecordcurrent(Source/Tape)
Typell Tape Speed
check
- Usethesameinput level
asfor the biasadjust-
ment
(- 35 dB)
and
1000IIz. Play
backTandberg
test
cassette
No. 21 (speed
check 1000Hz) andmeasurewith a frequency
- Adjusttherecordcurrentby meansof the REC. counter
on theOUTPUTsockets:
LEVEL ADJ.pots
Rl09 and R209
to obtain the <! 03% (995
to 1005Hz).
sameoutput level
for both positionson the
Monitor button. Wow
andflutter
R1101andR1201affectthetreble
response
in I
thefrequencyregion15-18 kHz on theplayback Play back a Tandbergtest cassetteNo. 22
curveforall typesof tapes. (3150 Hz) and measurewith a wow and flutter
meter
on theOUTPUTsockets:
Level
meters
adjustment,
record weightedRMS:( 0.09%
WeightedPeak
DIN 45511 10.2%
- SettheMonitor button to Tape' Record/prayback
- Apply 1000Hz to the INPUT sockets
(both Recordfrom a generator31b0 Hz (check
with a
channels)' frequency.or,ni., andmeasure
with the wow and
flutter meteron theOUTPUTsockets.
- Press the Recordbutton and adjustthe Input
Level controls for 1.5 volt ,.uiing on thi weightedRMS:( 0'12%
OL-rTPI-IT
sockets.
- Adjustthe
REC.METERpots.
Rl13 and
R213
to obtain0 dB on thelevelmeters.
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