TANDBERG 6000X Series User manual

JANDBERG
Serles 6OOOX
SER\/IGE MANUAL
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CONTENTS
1.0Mechanical Adjustments
1.1 Clutches
1.1.1Take-upT\rrntable
1.1.2
Supply
T\rrntable
1.2 Brakes
1.3 PressurePadAdjustment
1.4 EndStop
Mechanism
1.4.1TapeFeelerTension
1.4.2Adjustment
of TapeFeeler
Alignment
2.1 Demagnetizing
2.2 Bias-
and
EraseCircuits
2.2.1OscillatorFrequency
2.2.2
Erase
Voltage
2.2.3Bias
Current
TapePath
3.1 Visual
Check
3.2 MechanicalAdjustmentof Tape
Path
HeadAlignment
with TandbergTestTapes
Model
6041X
4.1 PlaybackHead
4.1.1
Height
Adjustment
4.1.2
Azimuth
Adjustment
4.2 Record Head
4.2.1HeightAdjustmentby
VisualInspection
4.2.2
Height
Adjustment
by
Track Measurement
4.3 BiasHead
4.3.1VerticalAdjustment
4.3.2
HeightAdjustment
4.3.3
HorizontalAdjustment
4.4 EraseHead
4.4.1HeightAdjustment
4.4.2 AzimuthAdjustment
4.5 Model6021X
HeadAlignment
WithoutTandbergTestTapes,
Model
6041X
5.1 Playback Head
5.1.1HeightAlignment
5.1.2AzimuthAlignment
5.2 Record Head
5.3 BiasHead
5.4 EraseHead
5.4.1HeightAdjustment
5.4.2AzimuthAdjustment
5.5Model
6021X
7.0 Adjustment
andControlof theAmplifiers 9
7.1.1PlaybackLevel
Adjustment I
7.1.2
Adjustment
of BiasCurrent 9
7.1.3
RecordLevel
Adjustment 9
7.1.4
Record/PlaybackCurves I
7.1.5
IndicatorAdjustment
in RecordMode 9
7.1.6Distortion I
7.1.7
IndicatorAdjustment
in Playback
andAmplifier Modes 9
7.1.8
Controlof the Playback
Amplifier I
7.2 TapeSpeed
Control 10
7.2.1
UsingFrequencyMeter
or Counter 10
7.2.2
UsingTransformer
andVacuum
Ttrbe
Voltmeter
7.2.3
UsingTapeof Known Length
8.0 Adjustment
of theAmplifiers,without
Tandberg
TestTapes
8.1 Playback
andRecordLevel
Adjustment
8.2 Record/PlaybackCurves
8.3 Readjustment
of RecordLevels and
Indicators 10
8.4 Distortion 10
8.5 Controlof PlaybackandRecordAmplifiers11
8.5.1PlaybackAmplifier 11
8.5.2 RecordAmplifier 11
8.6 Pick-up
AmplifierCurve 11
8.7 Limiter 12
8.7.1
Adjustmentof LimitingThreshold 72
8.7.2
Adjustmentof ReleaseTime 12
9.0 Modifications
9.1 Modification
from 230/115V
50Hz
to 230/115V
60Hz operation
9.2 Modification
from Four-Track
to Two-Track
Venion
9.3 ImportantElectricalModifications
Introduced
in Series6000X
10.0Lubrication
11.0Illustrations
with Reference Part
Numbers
12.0 SpareParts
List for Tandberg
Tape
Recorder6000X
12.1MechanicalParts
12.2Screws,
Washers,NutsandCirclips
12.3ElectricalComponents
12.3.1Transistors
12.3.2Diodes
12.3.3Rectifier
1
2.3.4
Trimming
Capacitor
12.3.5Poientiometers
12.3.6Heads
12.3.7Transfonners
13.0 Transistor
andDiode
Identification
14.0 BlockDiagram Series
6000X
15.0 PrintedWiringBoardsand
lViringDiagram
2.0
3.0
4.0
I
I
I
tt
I10
10
10
10
10
t2
13
5.0 13
13
I4
1.7
77
2L
21
2L
22
22
9'
,t
22
22
23
23
24
6.0 Track
Control
6.1 Model
6041X
6.1.1RecordHead
6.1.2
EraseHead
6.1.3PlaybackHead
6.2 Model 6021X
6.2.1EraseHead
6.2.2
Record
Head
6.2.3Playbacktlead
^

1.0
1.1 MECHANICALADJUSTMENT
Clutches
1.1.1
Take-upTurntable
Normal Forwarddrive
Set the operating lever to normal forward drive position
with the motor running. Ensure that the clearance
between the polyurethane friction pads under the turn-
table and friction disc
991009 laysbetween
0,5-0,9 mm
(0.02"-0.035"). If necessary,adjust
screw
A as shown in
fig. 1.1.
1
991034
0,5-0.9 mm L
{0.02"-0.35") I -
Control of Winding Torque
Note: All controls and measurements
must be carried out
with the tape recorder placed in horizontal posi-
tion and with empty reels
only.
The control is accomplished as shown in fig. 1.2, which
presents
two optional modes of control.
Fig. 1.2 Control of winding force. Normal forward drivemode.
FastForwardWinding
Control of FastWinding Torque
Set the operating lever to fast forward winding position.
The control is accomplished asshown in fig. 1.3, which
presents
two optional modes of control,
-
il
991017 991013
Fig.1.1 .rl
30 mm radius
Force:
4O-80g
80 mm radius
While measuring, the reel should beallowed to havea
slow rotation. The instrument should follow the
movement in a straight line towards the tape recor-
der.
Notc: After a longer period of continuous
operation, an increase of the torque by
20-30V" isconsidered as normal.
Force:
15-30g
.arl
4
+iI

30 mm radius
Fig. 1.3 Control of fastwinding torque. Fastforward winding mode
80 mm radius
\^
\'t\
If the torque deviates
figure, check and, if
spring
2673738.
from the specifications in the
necessary, alter the pressure of
Ensurethat there is a clearancebetweenthe studson
frictiondisc991010
and
lever
991013.
Seefig.1.4.
1.1.2SupplyTurntable
Control
of Tape
Tightening
Tension
Settheoperating
leverto normal
forwarddrive
position.
Thecontrol isaccomplished
asshown
in fig. 1.5,
which
presents
two optionalmodes
of control.
min0,1 mm
(0.091")
991017991013 991OlO 261805
Fig. 1.4
\F
Force:
90-2509
30 mm radius
Force:
O-99o
80 mm radius
While measuring, the reel should be allowed to have a slow rotation. The instrument should follow the
movement in a straight line towards the tape recorder.
F
Fig. 1.5 Control of tape tightening tension. Normal forward drive mode.

Fast
Reverse
Winding
Control of Fast Reverse
Winding Torque
Set the operating leverto fast reverse
winding position.
The control is accomplished
as
shown in fig. 1.6, which
presents
two optional modes
of control.
30 mm radius 80 mm radius
Force:
90-250g
Force:
240-67 0g
Fig. 1.6 control of fast reverse
winding torque. Fast reverse
winding mode
J
1F{
If the torque deviates from the specifications in the
figure, check and, if necessary, alter the pressure of
spring261805.
Seefig. 1.7.
The difference between Fast Winding Torque and Fast
reverse
Winding Torque should be lesi than 180 g (force
measured
at 30 mm radius),
or 50 g (measured
at g0 mm
1a--dius!
If necessary,
alter the p.esiu.e of spring 261g0b
(fig. 1.7),or spring2673738 (fig. 1.1).
1.2
Brakes
See
fig. 1.8.
Set the operating lever to normal forward drive position.
Check that the clearancebetween the brake pad^
and the
tumtable is approx. 1 mm (0.04"). If necesiary,
adjust
screwD.
Set the operating lever to fast forward winding or fast
reverse winding respectively. Ensure that the clearance
between screw C and the bottom of the hinged delrin
partson operatingarm 991012 lays between 0,b-1 mm
(0.02"-0.04"). If necessary,
adjust
screw
C.
The adjustment prosedure isequal for both turntables.
1.3
Pressure
Pad
Adjustment
Set the operatinglever
to neutral position. The clearance
between the pressure pad 990325 and the tape rest
254844 should be approx. 6,5 mm (1/4") as
shown in
fig. 1-.!. If necessary,
adju,st
the clearanceby bending the
arm 254025with a pair of pliers.
Seefig. 1.10.
Set the operating lever to normal forward drive position.
The pressure of the pad against the tape rest slould be
80 g (2.8 oz) ! tO 7o, measured on the end of the
pressure pad arm 254025. See fig. 1.11. If necessary,
adjust the pressureby bending the spring 268062 with-a
pair of pliers. Seefig. 1.12.
Fig. 1.7
.)fl
Fig. 1.8 991Ol7(0.02"-0.04") i)c

I
-
;
251489
A
6,5
mm
(1/4").
Fig. 1.9
Fig.
1.10
1.4 End StoP Mechanisrn
1.4.1
TaPe
Feeler
Tension
The feeler
tension
against
the tape
shouldlay.between
8
;; i;'; to.ie-o.fs o') in a'ii" and.
windingmodes'
Adiustment of the tensioitii accomptishgd-u.v
tightening
;'"i;t;;;iline.p'l"g 243eeo'
see
fig' 1'14'
1.4.2
Adlustment
of TaPe
Feeler
See
fig.
1.13
and
1.14'
S.; il: operatinglever in normal forward driveposition'
or forward or reverse
winding' Th-e
mains.switch
issetto
bN."ff;di .r'"ura ;;-;;e;hd' rhe tape reeler
will
ir,i;"i';" "T;-i; *,J-poiiti"rr Yh:T"--ll3 motor is
ffi;; oii. p.ro tt'" t!"tet slowlv-through the guide
oost. Whenthe rear tla" "f the feeler-is
min' 0'5mm
id;t";'ii"* ttt" porislea-"ontact surface
of the guide
i"".","1t*'-"";#qt.l""F*iml*n3iiil".n';"i
not, loosen screw r'.i
until the motor startJ- when the tape feeler is in the
",i.iirJii""i""iri"a "u"u"' irten tighten
-
the
screw'
When
fi;;';;;; ii"r"t it released,
the
microswitch
should
open'
and stop the motor when the spacing.
between the tape
feeler and the arm 244694A- is minimum ( 0'5 mm
(0.02").
See
fig. 1.14.
80g (2.82
oz)1 t0%
@
Fig.
1.11
Min0,5
mm
{0.02")
F\ !f Fig.
1.13
DF Fig.
1.12 Fig. 1.14

2.0
ALIGNMENT
It is-important that the contact between the tape and the
heads on.the tape recorder is good. To obtain optimum
resultson new tapes, the tape should be run through the
tape recorder approx. 5 times at normal speed to have
the tape polished before measuring the friquency res-
ponse
and the signal-to-noise
ratio.
2.1Demagnetizing
Demagnetizethe heads
and adjacent parts before aligning
the heads.
2.2
Bias-
and
Erase
Circuits
2.2.1 Oscillator Frequency
Connect a calibrated long wave receiver (tuned to 256.5
kHz), frequency meter or frequency counter to the
oscillator by means of a pick-up loop placed around the
erase
head. Adjust the oscillator frequency to 8b.b kHz
by mensof C404.
2.2.2 Era* Voltage
Set the tape recorder for stereo recording and connect a
VTVM to upper half of the erase head by means of a
low-capacitance
probe. The voltage should be 80-120V.
Then check that the same voltage appears across lower
headhalf.
Set the tape recorder for recording on channel L and
check the voltage across upper half of the erase head.
The deviation from the voltage measured in stereo
recording should not exceed 10V. Proceed similarly for
recording on channel R.
2.2.3 BtasCurrent
Set the tape recorder for stereo recording and measure
the voltage across upper half of the bias head by means
of a VTVM. Adjust the voltage to 22Y by means of
R407. Check the voltage across lower head-half and
adjust to 22Y by means
of R410. Demagnetizeheads
and
tape path.
3.2 Mechanical
adjustment
of tape
path
Prior to the electrical adjustment of the heads, it is
essential to make the tape run without sideways move-
ment through the path.
Set the operating lever to neutral position. Unscrew the
screw holding latch 215563 to allow the latch to settle in
the position determined by spring 284478. Then tighten
the screw. The spring pressure will now be equal against
the_ upper and lower points of pressure roller pivot
247941.
Put a tape free from damages on the recorder in normal
way and set the operating lever to normal forward drive
position, Adjust the azimuth position of pressure roller
99033.1with a screw driver asshown in fig. 3.2, until the
tapg ls running evenly through the rest of the tape path,
$ightly touching on-e of the flanges of the tape post 1
located adjacent to the capstan.
Align guide post 2, 3, and 4 similarly. If necessary,
adjust
pressure roller spring 234478 to make the tape run
perfectly.
-
-<l
3.0TAPE
PATH
3.1
Visual
Check
Load the recorder with a t-ape,and move the operating
lever dowly to the normal forward drive position. Checi
that the bias head neither touches the height adjustment
screws(C) on the record head base
plate, nor presses
the
tape against the record head. Also check thit the bias
head is parallel to the record head.
Operate the start/stop button, and check that the tape
runs within the rims of the pressure wheel rubber
without flickering on neither side of the pressure
wheel.
Check that height positioning of the guide posts is
cor:ect. It can be tolerated that the tape touches the
flanges of the guide posts when the recorder is in normal
forward drive, or as the drive mechanism isengaged.
The
tapemust, however, by no meansbulge at the flanges.
ln
IHMD
Fig. 3.1 Tape path adjustment screws
Fig. 3.2 Azimuth adjustment of pressure
roller
rll'\

--
(?4;
4.0 HEADALIGNMENTWITH TANDBERG
TESTTAPES,MODEL
6041X
4.1Playback
Head
Set the recorder for stereo playback and connect a
VTVM to eachone of the phono outputs.
4.1.1 HeightAdiustment
Play Tandberg test tape No. 1. This is a full track
prerecorded tape with 1.000 Hz recorded at 7 ll2 ips,
and with the area corresponding to track 3 reduced by
approx. 30 dB. Adjust the height of the playback head
by means of the screws (A) until minimum output is
obtained from track 3 (channel R), while endeavourlng
to maintain the headfront parallel to the tape.
4.1.2 Azlmuth Adjustment
Play Tandberg test tape No. 2. This is a full track
prerecorded tape with 10 000 or 15 000 Hz recorded at
7 tl2 ips. Adjust the azimuth position of the playback
head by means of the screw (B), until maximum
indication on the VTVM is obtained.
4.2 Record Head
4.2.1 Height Adiustment by Visual Inspection
Insert a new tape, and start the recorder in normal
forward drive. Check visually that the tape appears to
run parallel with the upper track of the record head, with
a play of approx. 0,1 mm (4 mils). If necessary,
adjust
the height with screws
(C) fig. 3.1, while endeavouring to
maintain the headfront parallel to the tape.
4.2.2Heighl Adiustment by Track Meaurement
Record in stereo, well above normal level, first in one
direction, then in the opposite. Cut off a length of tape
and dip it into a solution of fine grained iron oxyde
powder and alcohol (Magna See). The tracks will then be
visible as four dark stripes with spacingsin lighter shade.
Fig.6.1 shows the correct pattern on the tape and the
patterns obtained when the head is positioned either too
high or too low.
Adjust as above and perform a new track measurement.
4.2.3 Azimuth Adiustment
Load a new tape into the tape recorder and record at
tape speed 7 Ll2 ips, a 15 000 Hz signal in stereo.
Depress
both playback buttons and turn both playback
volume potentiometers to maximum. Adjust both Line
Record l,evel knobs for approx. 150 mV at the outputs.
Adjust the record head azimuth screw for maximum
output from both channels simultaneously or best
compromise.
4.3
Bias
Head
4.3.1 Vertical Adiustment
Move the operating lever slowly to the normal forward
drive position and check that the head fronts of bias-and
record heads are parallel. If necessary, bend the arm of
the biasheadasrequired.
4.3.2 HeightAdjustment
Set the tape recorder in record mode, and unscrew the
locking screw (H) fig. 3.1, about 1/2 turn. Connect a
VTVM acrosseach one of the record head halves.Move
the bias head up or down by means
of adjustment screw
M for the highest possible reading on the voltmeter.
Check that the tape runs freely in the groovein front of
the bias head and that there is sufficient clearance
between the bias head and the mounting plate for the
record head. The height position of the bias head is not
critical, and if the clearance between the bias head and
the mounting plate for the record head is insufficient,
raisethe biashead slightly.
4.3.3 Horizontal Adjustment
Connect a VTVM across each one of the record
headhalves, and set the tape recorder for stereo record-
ing. Insert a screwdriver in groove I, ref. fig. 3.1, and pull
the bias head to the right.
Then pull the bias head carefully by means of the
screwdriver towards the left hand side.
Induced voltage (bias) in recording head increasesto a
maximum. Continue pulling the head towards left side
until the bias is reduced by 10-15 7o
below maximum.
When the position has been found, thigthen the screw
(H) while maintaining correct horizontal position of the
head. Then recheck the output voltage. If a noticeable
change has occured, the horizontal procedure has to be
repeated.
4.4EraseHead
4.4.1 Height Adjustment
By visual inspection, check that approx. 0,25 mm (10
mils) of the upper half of the erasehead isvisible above
the tape. Insert Tandberg test tape No. 9 and record a
4OO Hz signal at 7 Ll2 ips well above normal level on
channel R (track 3). Dip the tape in a solution of fine
grained iron oxyde powder and alcohol (Magna See
solution). Check that the recorded track is positioned in
centre of the erasedtrack. Make surethat no parts of the
adjacent tracks are erased, see fig. 6.2. If necessary,
adjust the height of the erase head by means of the
screws (K) and (L) ref. fig. 3.1, and repeat the above
check.
4.4.2 Azimuth Adlustment
Check that the head front of the erase head is
perpendicular to the mounting plate. If necessar5r,
adjust
azimuth position by meansof the screws
(K) ref. fig. 3.1.
This adjustment is not critical.
4.5Model6021X
The alignments specified in para. 4.0 are valid for the
model 6021X with the exception of paragraph 4.1.1,
which is supensededby 5.1.1 and paragraph4.2.1, which
issuperseded
by 6.2.2.
$'rF
D{^

5.0 HEAD ALIGNMENT WITHOUT
TANDBERG
TEST
TAPES,
MODEL
6041X
5.1Playback
Head
5.1.1 HeightAlignment
The height of the playback head is aligned by the height
adjustment screws
(A), ref. fig. 3.1. The upper edgeof
the tape shall run flush with the upper part of the head
lamination for channelL.
5.1.2Azimuth Alignment
Play back a standard azimuth alignment tape with a
VTVM connected to each output. Adjust the position of
the playback head by the azimuth adjustment screw (B)
ref. fig. 3.1, until maximum reading is obtained on the
output meters.
5.2Record
Head
Follow the instructions given under paragraph 4.2.
5.3Bias
Head
Follow the instructions givenunder paragpaph
4.3
5.4Erase
Head
5.4.1 Height Adjustment
The height of the erase head is aligned by the height
adiustment screws (K and L) ref. fig. 3.1. Approx. 0'25
min tfO mils) of the ferite core for the upper track of
the erasehead should be visible above the tape.
5.4.2 Azimuth Adjustment
Align the azimuth position of the erase head by the
azimuth adjustment screws(K). The erasehead should be
parallel with the mounting plate for the heads. The
azimuth position of the erase
head is not critical.
5.5
Model6021X
The alignments specified in paragraph 5.0 are valid for
model 6021X with the exception of paragraph
5.2 which
is superseded by 4.2. Paragtaph 4.2.1 is superseded by
6.2.2.Paragraph
5.4.1issupersededby 6.2.1.
6.0
TRACK
CONTROL
6.1
Model6041X
6.1.1 RecordHead
Record a 1.000 Hz signalfrom a generator well above
optimum recording
levelin stereoA-test
on tracks1 and
3 for approx. 5 seconds.
Turn the tape around and make
a similar recording on tracks 4 and 2. Cut the tape and
dip it into amixture of fine glained iron oxyde powder
and alcohol (Magna
Seesolution) to make the recording
visible. The spaces
between the recorded tracks should be
distributed equidistant across the tape, ref. fig.6.1.
Readjust the height position, if necessary,
and recheck
the azimuth alignment.
6.1.2The Erase
Head
Insert a full-track prerecorded tape and record a 1'000
Hz signal from a generator, well above optimum record'
ing level in mono on track 3 (channel R). Cut the tape
and dip it into the Magna Seesolution. Check'that the
prereeorded track is in the centre of the erasedarea,
ref'
fig.6.2. Adjust the vertical position of the erasehead if
necessarv.
6.1.3 Playback
Head
Record a 1.000 Hz signal on track 1 (channel L) and a
500 Hz signal on track 3 (channel R) at optimum
recording levels. Turn the tape around and play back
track 2 (channel R) at maximum volume. No signal
should be heard. Raise
the playback headif the 1.000 Hz
signal is heard. Lower the playback head if the 500 Hz
signalis heard. Recheck the azimuth position.
,-t
tn
-
-
Too high
Correct
Fig. 6.1 Track measurement of record head
-
-Too high
Correct
:
:
Too low
Fig. 6.2 Track measurement of erase
head
Too low
tro

l)a
6.2
Model
6021X
6.2.1Erase
Head
The height of the eraseheadisalignedby the adjustment
screws
(K and L) ref. fig. 3.1. Record a 1.000 Hz signal
in stereo well above optimum recording level on a
full-track prerecordedtape. Dip the tape in the Magna
See solution and check that the tracks are distributed
symmetrically acrossthe tape. Readjust the erase and the
record heads,if necessary.
6.2.2RecordHead
The height of the record head is aligned by the height
adjustment screws (C). Record a 1.000 Hz signal in
stereowell aboveoptimum recording level on a full-track
prerecordedtape. Dip the tape in Magna See
solution and
check that the tracks are distributed symmetrically
acrossthe tape. Readjust the eraseand the record heads,
6.2.3
Playback
Head
The height of the playback head is aligned by the height
adjustment screws (A). The tape shall run parallel with
the upper edgeof the lamination for channel L. Readjust
the azimuth position if necessary.
7.0ADJUSTMENTAND CONTROLOF THE
AMPLIFIERS.
7.1.1PlaybackLevelAdiustment
Connect a VTVM to eachone of the phono ouq)uts, and
tum the playback volume controls to maximum. Set the
recorder for 7 tl2 ips playback of Tandberg test tape
No. 4 and adjust R150 (L) and R250 (R) for 1.5V
readingon both vacuum tube voltmeters.
7.1.2Adlustmentof BiasCurrent
Insert a new reel of good quality tape (Low Noise).
Connect a VTVM to Line Output terminals, and signal
generator to Line Input terminals and set the generator
for 1.000 Hz and 0.5 volt. Set the Output Level Controls
to maximum and adjust the Record Level Controls to
150 mV deflection on VTVM. Set the tape recorder for
stereo recording. Adjust R407 to maximum deflection
on left channel VTVM, and R410 to maximum on right
channelVTVM.
Note: The 2-track model is also equipped with individu-
^ ally tuned bias- and erase heads. The values of
il {T--\ C40?, C408 and C126. C226 are labelled on the
' bias- and erase heads, respectively. The capaci-
tances are given in pF. Upper number refers to
uppertrack.
7.1.3RecordLevelAdjustment
Inserta new tape and record a4OOHz signa.latT l12ips
in A-test. Adjust the recording levels for a VTVM
indication of 1.5V at both phono outputs. Depressthe
playback buttons (B-test) and adjust the recording
current by meansof R108 (left channel)
and R208 (right
channel)
until anoutput voltage of 1.5 V isobtained.
7.1.4 Record/Playback
Curves
Ref. para. 8.2 for adjustment
playback curves. and control of record/
7.1.5 Indicator Adjustment in Record
Mooe
Setting of levels,the sameasin paragraph 7.1.3.
Adjust R124 for a 0 dB reading on left record level
indicator and set F-224 for the same reading on right
indicator.
Release both playback buttons and check that the
output voltage isstill 1.5 V for both channels.
7.1.6 Distortion
Connect signal generator 400 Hz, 0.5 V and distortion
meter to outputs. Record in B-test on both channels.
Adjust Record Level controls to 0 dB deflection on
indicators. Check distortion to be less than 37o. lf
distortion exceeds 37o, readjust recording level and
indicator,ref. paras.
7.1.3and 7.1.5.
7.1.7 Indicator Adjustment in Playback and Amplifier
Modes.
Set the tape recorder in stereo preamplifier mode, and
check that the vacuum tube voltmeters read 1.5V on
phono output. Adjust P"422
(L) and R445 (R) until both
level indicators read 0 dB.
7.1.8 Control of PlaybackAmplifier
Play back Tandberg test No. 3. This is a full track
prerecorded tape with the following frequencies:
250-10.000-5.000-
1.000-
10O-5O-
25OHz
recorded
at 7 7
|
2
ips tape speed. The tape conforms with the N.A.B.
standard.
The output tolerances
are:
10 kHz: 0 - + 4 dB,
5 kHz: + 1 - + 3 dB. The other frequencies have
tolerances t 2 dB. The difference in levelbetweenthe
two channelsshouldbelessthan 3dB.
rF

7.2Tape SpeedControl
7.2.1
UsingFrequency
Meter
or Counter.
Connect
a frequency
meter
or countertophono Output
and
play backTandberg
test
tapeNo. 11 (1.000 Hz) at
7 ll2 ipstape
speed.
Differencefrom correcttapespeed
isindicated
in %.
Tolerance: 11.7o
7.2.2 UsingTransformer and Vacuum Tube Voltmeter
Connecta transformer 115/0.5 V or 230/0.5 V, 50/60
Hz and a VTVM to the phono Output and the mains as
shown in fig. 7.1. Play back Tandberg
testtapeNo. 10 a
(mains frequency 50 Hz) or No. 19 a (mainsfrequency
60 Hz) at 7 712ipstapespeed.
Deviation from correct tape speed will givea beat across
the VTVM. Turn the Output Level Control to obtain
adequatemeter deflection.
Clock the time for 10 comolete excursionsof the meter
needle.
Read the speed deviation in per cent corresponding to
this
particular
time from the nomogram in |ig.7.2.
Brake left hand turntable slightly to decideif tape speed
is too high or too low. Increased deviation indicates too
low tape speed.
At 3314 ips, play Tandberg test tape No. 10 b (50 Hz
mains frequency). Proceed as for 7 1/2 ips to find speed
accuracy.
Speed
tolerance:t l7o"
Fig.7.1
,0 2,5 2,A 1,5 r,0 0,5 gL 0/3
1,.,,r.,,1,,,,1,, , l, , , , I I I SPeeddeviotion('A)
Ihme rn seconds
.,,J I I I | | | | torr0 complete
l0 40 50 6066 excursrons-
F\9.7
.2
7.2.3 UsingTape of Known Length
Inserta tape of known length 450" (1144 cm) and play
it back. Time taken for the whole length strould be:
7 1/2 ips: 60 seconds
3 3/4 ips:120 seconds
1 7/8 ips:240 seconds
Tnloranne . 'l 7^
8.0
ADJUSTMENT
OFTHE AMPLIFIERS
WITHOUTTANDBERG
TESTTAPES
8.1Playback
andRecordLevelAdjustment
Connect a VTVM to each output terminal. The signal
generator is connected to the Line Input of both
channelsand tuned to 400 Hz.
The tape recorder is setup for stereorecording A-test, at
7 112 ips tape speed. Insert a good quality tape (Low
Noise).
Adjust the recording gain controls until the reading on
the output meters are 1.5 V with the playback controls
to maximum. Replace the VTVM for channel L with a
distortion rneter and depress the playback push button
(B-test).
Adjust the recording current by R108 until the
readingshows 3 % distortion.
Replace the VTVM for channel R with the distortion
meter and depressthe push button playback R (B-test).
Adjust the recording current by R208 until the reading
shows 3 % distortion. Connect a VTVM to each output
terminal and proceed the recording as
discribedabovein
stereo B-test"
Adjust R150 (channet L) and R250 (channel
R) until the
reading on the output meters are 1.5 V. Make sure that
the playback volume controls ate set to maximum.
Release the push-buttons Playback L and R (Stereo
A-test) and check that the reading on the output meters
still are1.5 V.
8.2 Record/Playback
Curves
Connect a VTVM to each one of the phono outputs L
and R. In order to avoid interference from the oscillator
voltage, a band stop or a low passfilter tuned to 85.5
kHz must be inserted between the output and the
voltmeters.
Set the tape recorder for 3 314ips stereorecording, level
30 dB below optimum (0 dB). Use the output VTVM
reading as
referencelevels.
Then record a 16.000 Hz signal at the same level and
check that the output voltage is within ! 2 dB. If the
voltage is too high, increase bias current by means of
R407 for channel
L and R410 for channel
R.
If the voltage is too low, alter the input signalfrequency
to 1.000 Hz and adjust for maximum output voltage by
means of R407 and R410 for channels L and R
respectively. Then go back to 400 Hz, reestablish the
reference level, and recheck the output level at frequen'
cies between 50 and 16.000 Hz do not deviatemore than
t 2 dB from reference level.
Perform the same check for 7 112 tps at frequencies
between 40 and 20.000 Hz, and then finally check for
1 7/8 ips between 50 and 9.000 Hz. Ref. level 4OO
Hz.
the output levels of the two channelsshould not at any
frequency differ by more than 3 dB.
8.3 Readjustment of Recording Levels and
Indicators
For readjustments of recording levels and indicators ref.
paragraph
7.1.3and ?.1.4.
8.4 Distortion
Ref. para. 7.1.6for adjustmentand control of distortion.
^+
I
I
+,1
i
4
20 25
'l
n ( rr lU
-:'- ' nrrreu I
50
or
60Hz
115
V)60 Hz
230V,50H2

A
8.5 Controlof Playback
and RecordAmplifiers
If the specified tolerancesfor frequency respons€are
exceeded,
checkthe playback and recordamplifiers.
8.5.1 Playback
Amplifier
Connect a signal generator in series with a I kohm
resistorand a 100 uF capacitor and playback head,see
fig.8.1.
Signa
generato
Fio A 1
Connect also VTVM to eachof the Line Outputs and set
playback volume control to maximum.
Set the tape recorder for stereo playback. To ensure
correct signal level, apply oscilloscope. Tune the gene-
rator to 4OO
Hz and adjust the level to 20 dB below 1.5
V, i.e. 150 mV. Check the frequency response
according
to fie.8.2.
Fig.8.2 Playback
curves
VTVM
Fig.
8.3
mHr S l@ ?@
Fig. 8.4 Recording curves
8.6Pick-up
Amplifier
Curve
Set the input selector in position PICK UP and the
pick-up selector in position MAGN. Leave
all buttons
unoperated (stereo amplifier mode
). Output Volume
Controls to maximum. Set signal generator
to 4OOHz.
Adjust with Record Level
Controlsto 150 mV output on
VTVM (1.5 V - : 20 dB). Check by means of
voltmeters connected to the phono output that the
frequency responseconforms within a tolerance
of 2 dB
with the RIAA curveshown in fie. 8.5.
Irf
F\,
t
1. +
F
ELEC'IRONIC
SERVICT
CENTER
A DlV. OI t,f,iV;F()T'{(]i-";}JC.
862 Hil-r-t/"'.."-ri: i'-';/').
i',1A5!-ivlLl-
t. i;:
6.t:.t ;:;.{zf
.5.2
Record
AnrPlifier :li . '- f 1-
"i-l
Connect a VTVM to each one of the head-halves as
' shown in fig. 8.3 and a signal
generator
to Line Input for ':- . -+1 ' - -:
, each channel. Short-circuit trimming capacitor C404 in 'i '- - I * --
oscillator. Set the tape recorder for stereo recording,
\ with input selectorsto Line position. Set
the level30 dB -,6i - | 1--- .-i
- below 0 dB indicator deflection i.e. 20 dB down on .,oi-
.- - =1 1., -, I
"l -r-hi-i -: .F"i!.'ulgu.'"'utor'and10dBdownbymeansofRecord
Level bontrols. Use 400 Hz as refurence on VTVM ?0 r'0
" deflection. Check the frequency response according to
' fig. 8.4' Fig. 8.5 RIAA curve
for magnetic
pick-up
R12
6
(R226)
30
(24
)
R'.r3s
(R235)

50 r00 2o 500 rm ?0m 5000 10000 m000 50000
response tolerances according
Fig. 8.6 Total frequency
to DIN 45511
8.7Limiter
Set
both volume controls to maximum.
8.7.1Adjustment of Limiting Threshold
Set the input and outputcontrolsto maximum. Feed400
Hz signalsinto the Line lnputs in amplifier mode and set
the level to 0 dB on the indicators. DepressLIMIT
button and adjust both R320 for +- 1 dB readingon the
indicators. Increase the input 20 dB and check that
indicator readingdoesnot increase by more than approx.
2 dB.
8.7.2 Adiustment of Release
Time
Connect an oscilloscope with calibratedtime scale to the
phono output. Feed 400 Hz signalsinto the line input,
and set signallevelsfor 0 dB readingon the indicators.
Depress LIMIT button, and increase the signal level by
20 dB.
Then abruptly decreasethe level by 20 dB, and deter-
mine by meansof the oscilloscope
pattern the time taken
for the output sigrral to return to approx. 1 dB below
normal level on indicator.
Seefig. 8.7. Adjust the time to 0.7sby meansof R311.
LITIIT
Fig. 8.7
.+
+
9.0
MODIFICATIONS
9.1 Modification
from 23O/115V50 Hz to
2301115V60Hz operation
The transformer must be rewired when changing from 50
FIzto 60 Hz or 230V to l15V operation, while motor
pulley and motor capacitor have to be changed.Connect
as
shownin fig. 9.1-9.2 and descriptionbelow.
230V connections
230V, 50 Hz: Motor pulley, part No.: 245777. Motor
capacitor: 2 uF, oil paper SVo 320V. Clamp
for motor capacitor, part No.: 263184.
230V, 60 Hz: Motor pulley, part No.: 247452. Motor
capacitor: 1,5 uF, oil paper 57. 320V.
Clamp for motor capacitor, part No.:
2631,84.
-t' q
257746
Fig. 9.1 230 V motor and transformer connections
fl

v
i
115V connections
115V, 50 Hz: Motor pulley, part No.: 245777. MoLor
capacitor: 8 uF, oil paper 5 % 220Y. Clamp
for motor capacitor, part No.: 991040.
115V, 60 Hz: Motor pulley, part No.: 247452. Motor
capacitor: 6,5 uF, oil paper 5 Vo22OY.
Clamp for motor, part No.: 206773.
When ordering motor pulley or clamp for motor capaci-
tor, specify the part number,
Fig. 9.2 1l-5 V motor and transformer connections
9.2Modificationfrom Four-Trackto Two-Track
Version
The following components have to be changed when
modifying from four-track to two-track. The value of
total capacitanceislabeled on two-track heads.
Part Four-Track Two-Track
Record head
Playback head
Erasehead
Bias head
c726
c226
c407
c408
c04-1
1R
c03-10P
D84-l8E
D90-038
250
pF
250
pF
3300
pF'
3300
pF
F82-07R
F83-11P
D87-20E
D92-04B
I Add capacitance
\ until value
l' labeledon head
J isobtained
The numbers indicating the heads are ordering numbers
for the heads.
9.3 lmportant Electrical Modifications
Introduced
in Series6000X
From serial number 2803700 output impedance
altered from 10 kohm to 5 kohm to meet
specifications 45511. The following components
modified:
R423 changedfrom 22 kohm to 10 kohm
R428 changedfrom 22 kohm to 10 kohm
R429 changedfrom 22 kohm to 10 kohm
R432 changedfrom 22 kohm to 10 kohm
R434 changedfrom 82 kohm to 47 kohm
R435 changedfrom 10 kohm to 5,6 kohm
R436 changedfrom 82 kohm to 47 kohm
R437 changedfrom 10 kohm to 5,6 kohm
From serial number 2803010 the following modifi-
cations were introduced in the limiter circuit:
Restistors R314 (10 kohm) were omitted and replaced
by capacitors C327 (2 uF). Resistors R346 (100 kohm)
were introduced from baseto emitter of Q305.
were
DIN
were
257746
)F 1O.OLUBRICATION
The
l\'lotor:
The motor should be lubricated after approximately
every
3000hours
of use.
The upper and the lower bearing should be lubricated
with aTeressooil 43 or 4?from Esso.
The Self Lubricating Bearings:
The turntables, the flywheel and the speed
transfer-wheel
are mounted in self lubricating bearings and should
usually not be lubricated. If, however, it should be
necessary to lubricate the bearings for any reason, use
Teressooil 43 or 47 from Esso.
Note: Utmost care must be taken while lubricating. Use
only one fractional drop of oil for each bearing.
Excessive oil might seriously affect the friction
drive.
F

1
1.0
ILLUSTRATIONS
WITHREFERENCE
PART
NUMBERS ,a
262674 26'1655 2607QO
264665
991007 260929
264355/
260131 /
261+60'
a. l _-_.
.-.......--..-
26i655
-- -263to9
-- 260641
206296
2629 A1
264169
261303
F /-'
+'r7\
----_ /262061
--_\ ,/
--<-264564
.f EA(
QOSE 'i,
NUT
262674 "62944
\
vEPTlcALPoslTloN'269772
261355 265026
Fig. 11.1.
ToP exterior vtew
2o2E5r r <^A )QR 240275
alal
'1" t' 'g
{N(
259600
l,-
s
1".*.
O
i,@
\-@
I ortouru
t
I
264786
264494
2697A6
264494
2697A6
261149 264E30
+991026
TAfl$StsBrs etortf
\
259754 261A3c- 264119
zsoao+ 218195 261970 2667774 264190 9911u^26
t

!7
^
r
2697EF)
264973 -
991OO8 ----
991Q14 -
991a17 -
260045
260153
261345
250828
99C305 215771
eeo233 \ ,rLsz (5oHz) 262969 991o^41 9?1013
242331 / 99C2C4
p 201/204/
I
206/2C7
228244 12631e3 \250131 D3k
26cJ42A 260131 26116C^ 262532 263c26
Fig. 11.3.Top view with coversremoved
252754 18E-D84 11Q-CO4 10p-CO3 262854 2416944
25i<8eA
\ zs<a<+a\
zszzs, I zszzs+ | zaorz=lggpzrl 24e551
254025 2s'1130
269786
264973
202151
991034
991011
991013
990312
264270
263709
263932
261593
991030
259681
p1o1/1o4
i
I
106/107
265096
990325
"12309
243013
242503
26O290
991A11
c4B-D92 \ 260577
219234 261511 1 2413124 23o185 990334
rs
Fig. 11.4.Tapepath and pressure
roller arm

20E222 260620 262782 991012 262531 263,184 (1,5
-2f f)
991004 262236 257746
Fig. 11.5. Bottom view
9 9100 0
991019
212036
26457E
- <oa)at
)A7AA A
211539
991001
260289
1o51.0<
269786
i:_26a973
t:t
f
991003
264003
263134
991002
2697E6
264973
991014
262193
260124
D_1o1/1O4/
I
1o6/1o7
991004 213997
990233
^ \_'-
r \L.
f
2a5771 (SOHz\
"4rt52 6oHz)
264932
261453 2598
262322 262969
|
,ur"uo
f ,",
lil/
{/t/ '%,
151
034
.l
* "t'1"
991
"/,
990201
u,/ ,r,o,
3
"'df r '
--;:r
9903
.1
?63309
263522
268e3? a 2ol/2o1/
2A6i207
86
26
II
460\ 2601
I ff660
261
93
260131
61 26
259881
120
1
}r
wJ
.l\
p 31-4\ 2634
12 261647
Fig. 11.6.Top view with upper mounting plateremoved
1
(l

,l
J
l
I
I
I
I
I
rn
201957
202008
202t5t
202309
203250
206296
206713
207977
208222
208724
209306
21
1339
21
1418
21
2036
212066
21
5953
216599
217783
2t8767
2L9234
2l
9816
^248cJ27 2c2151 207977 26O706 261c94
990346 214342A 24399o
991027 242sO3 244691 A263952A
^
262509
12.1
Mechanical
parts:
Fig. 11.7. Upper mounting plate seen
from underneath
12.0
SPARE
PARTS
LIST
FOR
TANDBERG
TAPE
RECORDER
6OOOX.
The numbers
of the mechanical
partson the figures
are
identical
with the numbers
"n tfi" p-"rt. i.r'.io.". p""t"
:lgr" 9".thefigures
without e*istin! in-ihe'j*t. ti.t .."
notavailable
as
spareparts.
Note: Appty part reference
numbers
when ordering
spare
parts.
Shaft
Mains cable
Microswitch
Shaft
Mains cable
Window
Clamp
Roller
Transformer
Clamp
Spring
Pulley
Shaft
Holder
Nut
Pulley
Fin
Retainer
Nut
Shaft
Flange
Pressurepad arm
115 V, 7FT
Eceentric segment
230 Y 22Ocmw/plug
Counter
Motor capacitor 6,buF
Eccen. segment
Microphone T301
Mains cable
Transfer wheel arm
Revolution counter
Lever
Operating lever
Cabinet
Turntable
Cooling
Tape reel
Turntable shaft
Pressure
roller arm assembly
Ttrrntable
housingL&R
261865

f
224r85
224796
228244
230183
230629B
234960
237482
240275
2402764
240406
2408794
242309
242337
242503
243013
243150
243990
2443424
2446944
245354
245777
24623t
24669L
247395
247452
24794L
248027
248157
248495
249306
249551
249737
251130
2574894
252tt5
252172
252496
252754
254025
2548444
255886
256864
2575t7
257746
259529
259600
259758
259773
259881
260045
260t24
260131
260153
260289
260290
260361
260421
260476
260577
260620
260641
260700
260706
260735
260828
260850
260929
Screw
Support
Connector
Shield
Roller
Washer
Spring
Connector
Screw
Spring
Plate
Spring
Spring
Arm
Tape guide
Arm
Spring
Arm
I-cver
Suppressor
Pulley
Clamp
Washer
Clip
Pulley
Shaft
Insulator
Bushing
Connector
Suppressor
Guide
Clip
Link
Arm
Switch
Bearing
Clamp
Tape guide
Arm
Support
Push button switch
Connector
Drive belt
Motor
Lamp
Selector switch
Connector
Plate
Jack
Meter
Transfer arm
Button
Arm
Sideplate
Tape support
Friction ring
Washer
Spring
Bearing
Panel
Knob
Knob
Eccentric arm
Screw
Bracket
Lever
:","_"i_o]11",..-
Vertical mounting feet
Sound-on-Sound switch
Microphone
Playback head
Stop arm
Speed selector shaft
Support, erasehead
Radio-P.up-Line
End stop
Record-playback head adj.
Ttansfer wire
End stop, transfer arm
Cam disc arm
End stop
Right
Bias head
End stop arm
End stop switch
End stop
Start-stop switch
Motor, 5OHz
End stop switch wires
Rec. potm.
9 mm (3/8")
Motor,60 Hz
Pressureroller
End stop switch
Adj. tape guide
26V
End stop switch
End stop lever
12.5mm (112")
Pressurc pad arm
Tape rest
Equalization
Flywheel
Adj.
Pressurepad
Pressurepad/tape
Assy.
Remote control
Counter
tLll23O V 50/60 Hz
Counter and meter. 24 V 1W
Pick-up
Phono
Fastening, printboard
Microphone, US version
Record and playback level indicator
Input switch
Limi ter-playback-stop
Input switch control, right
Right
Neut. position
Clutch L&R
Neoprene, start/stop solenoid
Input switch
Flutter filter
Front
Operating lever
Cueing control
Tape guide
Support, input switchr
Start/stop solenoid
Rear
? nin<
f,
+
f

260965
261051
26L072
261094
261216
261302
261303
261345
26t453
26t460
261525
261647
261655
261805
261
841
261885
261913
26t970
261992
261999
262064
262157
262153
262215
262236
262244
262258
262322
262402
26248r
262509
262537
262532
262545
262674
262739
262782
262833
262854
262969
262983
262984
263026
263105
263734
263184
263278
263335
263486
263493
263522
263688
263709
263817
263838
26387
4
263888
263896
263932
264003
264054
264083A
264L26
264L62
264769
264L90
2642L2
264226
264370
264355
264420
264427
264485
Spring
Socket
Tension spring
Guide
Adj. screw
Terminal connector
Screw
Input switch
Input switch
Button
Stud
Transfer arm
Screw
Coil spring
Coil spring
Screw
Spacer
Cover
Disc
Spacer
post
Cabinet
Spacer
Slide plate
Shield
Clamp
Steel ball
Roller
Knob
Contact spring
Arm
Lamp shield
Armature
Guide plate
Holder
Knob
Spring
Frame
Spring
Arm
Plate
Terminal plug
Screw
Control arm
Sideplate
Bracket
Clamp
Bracket
Plate
Transfer arm
Button
Spring
Screw
Button
Switch
Spacer
Bushing
Power switch
Shield
Guide
Sideplate
Spring
Tube
Spacer
Tape brake
Top plate
Holder
Screw
Guide
Counter
Knob
Sleeve
Wafer
Insulator
Cueing arm
Lamp meter
Pressureroller cover
Operating lever, pc.
Clutch-and-breakelevers
7 pins
Cover front
Control arm, left
Stop control
Record, right channel
Lifting arm
Control Sound-on-Sound switch
Ooverrear,japanned
Left clutch disc
Clutch and brake levers
End stop, feeler arm
Pick-up switch
Bottom
Thrust, bearing flywheel
Pushbutton assy.
Teak
Pushbutton assy.
Stainless steel
Line input board
Support, motor
Transfer arm input switch
Flutter filter
Speedselector
Counterlamp holder
Tape brake
Start/stop solenoid
Pushbuttons
Speedselector arm spring
Upper, rec/output lever control
Lower, operating lever
Main board holder
Pull rod
Speed
selector
Speedselector
3 pins
Cabinet5/8"
Switch. Sound-on-Sound
Right
PC boards
Motor capacitor1.5-2uF
Power switch
Retainer, flywheel bearing,Iower
Sound-on-Sound switch
Record left
Upper, operating lever
Topplate. 3 x 8 mm countersunk
Power switch
Sound-on-Sound
Function selector switch- small
Plastic,operating lever
Without button
Radio connector
Powerswitch button
Left
Biashead arm
Friction disc
Neoprene, start/stop solenoid
Insure rubber
Front
Mains plug, rear panel
Start/stop solenoid adj.
Slidearm
Lower, rec/out levelcontr.
Slide
arm damping
Sound-on-Soundswitch
Motor terminal