TANDBERG 6000X Series User manual

TANDBERG
Series GOOOX
SERVICE MANUAL
TANDBERGS RADIOFABRIKK A/S
“Ay

1.0
2.0
3.0
4.0
5.0
6.0
CONTENTS
Mechanical Adjustments
1.1 Clutches
1.1.1 Take-up Turntable
1.1.2 Supply Turntable
1.2 Brakes
1.3 Pressure Pad Adjustment
1.4 End Stop Mechanism
1.4.1 Tape Feeler Tension
1.4.2 Adjustment of Tape Feeler
Alignment
2.1 Demagnetizing
2.2 Bias- and Erase Circuits
2.2.1 Oscillator Frequency
2,2.2 Erase Voltage
2.2.3 Bias Current
Tape Path
3.1 Visual Check
3.2 Mechanical Adjustment of Tape Path
Head Alignment with Tandberg Test Tapes
Model 6041X
4.1 Playback Head
4,1.1 Height Adjustment
4.1.2 Azimuth Adjustment
4.2 Record Head
4.2.1 Height Adjustment by
Visual Inspection
4.2.2 Height Adjustment by
Track Measurement
4.3 Bias Head
4.3.1 Vertical Adjustment
4.3.2 Height Adjustment
4.3.3 Horizontal Adjustment
4.4 Erase Head
4.4.1 Height Adjustment
4.4.2 Azimuth Adjustment
4.5 Model 6021X
Head Alignment Without Tandberg Test Tapes,
Model 6041X
5.1 Playback Head
5.1.1 Height Alignment
5.1.2 Azimuth Alignment
5.2 Record Head
5.3 Bias Head
5.4 Erase Head
5.4.1 Height Adjustment
5.4.2 Azimuth Adjustment
5.5 Model 6021X
Track Control
6.1 Model 6041X
6.1.1 Record Head
6.1.2 Erase Head
6.1.8 Playback Head
6.2 Model 6021X
6.2.1 Erase Head
6.2.2 Record Head
6.2.3 Playback Head
OOOOW MOD WO DOOD OMOOO AINIIIITQ AW ANAVA ARMAMAG®OEGQeOATAHONIN
7.0 Adjustment and Control of the Amplifiers
7.1.1 Playback Level Adjustment
2 Adjustment of Bias Current
3 Record Level Adjustment
4 Record/Playback Curves
6 Distortion
.7 Indieator Adjustment in Playback
and Amplifier Modes
7.1.8 Control of the Playback Amplifier
7.2 Tape Speed Control
7.2.1 Using Frequency Meter or Counter
SRAszs
7.2.2 Using Transformer and Vacuum Tube
Voltmeter
7.2.3 Using Tape of Known Length
8.0 Adjustment of the Amplifiers, without
Tandberg Test Tapes
8.1 Playback and Record Level Adjustment
8.2 Record/Playback Curves
8.3 Readjustment of Record Levels and
Indicators
8.4 Distortion
8.5 Control of Playback and Record Amplifiers
8.5.1 Playback Amplifier
8.5.2 Record Amplifier
8.6 Pick-up Amplifier Curve
8.7 Limiter
8.7.1 Adjustment of Limiting Threshold
8.7.2 Adjustment of Release Time
9.0 Modifications
9.1 Modification from 230/115V 50 Hz
to 230/115V 60 Hz operation
9.2 Modification from Four-Track
to Two-Track Version
9.3 Important Electrical Modifications
Introduced in Series 6000X.
10.0 Lubrication
11.0 Dlustrations with Reference Part Numbers
12.0 Spare Parts List for Tandberg
Tape Recorder 6000X
12.1 Mechanical Parts
12.2 Screws, Washers, Nuts and Circlips
12.3 Electrical Components
12.3.1 Transistors
12.3.2 Diodes
12.3.3 Rectifier
12.3.4 Trimming Capacitor
12,3.5 Potentiometers
12.3.6 Heads
12.3.7 Transformers
13.0 Transistor and Diode Identification
14.0 Block Diagram Series 6000X
15.0 Printed Wiring Boards and Wiring Diagram
5 Indicator Adjustment in Record Mode

1.0 MECHANICAL ADJUSTMENT
1.1 Clutches
1.1.1 Take-up Turntable
Normat Forward drive
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 dise 991009 lays between 0,5—0,9 mm 991034
(0.020.035). If necessary, adjust screw A as shown in E (|
fig. 1.1. ce
Contro! of Winding Torque = “ :
991009 2673738
Note: All controls and measurements must be carried out 991017 991013
with the tape recorder placed in horizontal posi
tion and with empty reels only. Fig 1.1
The control is accomplished as shown in fig. 1.2, which
presents two optional modes of control.
30 mm radius 80 mm radius
[f
’
Force:
15—-30g
Force:
40-80g
While measuring, the reel should be allowed to havea Note: After a longer period - of continuous
slow rotation, The instrument should follow the operation, an increase of the torque by
movement in a straight line towards the tape recor 20-30% is considered as normal.
der.
Fig. 1,2 Control of winding force. Normal forward drive mode.
Fast Forward Winding
Control of Fast Winding Torque
Set the operating lever to fast forward winding position.
The control is accomplished as shown in fig. 1.3, which
presents two optional modes of control,

30 mm radius 80 mm radius
J Bs
Force:
90-2508
Force:
240-6 70g
Fig. 1.3 Control of fast winding torque. Fast forward winding mode.
If the torque deviates from the specifications in the
figure, check and, if necessary, alter the pressure of
spring 267373B.
Ensure that there is a clearance between the studs on
friction disc 991010 and lever 991013. See fig. 1.4.
1.1.2 Supply Turntable
Control of Tape Tightening Tension
7 ae
Set the operating lever to normal forward drive position. 991017 ../ /
The control is accomplished as shown in fig. 1.5, which $P10%D: . “sot o.201808
presents two optional modes of control. Fig. 1.4
Force:
022g
While measuring, the reel
movement in a straight line towards the tape recorder.
30 mm radius 80 mm radius
/
Mae
|
should be allowed to have a slow rotation. The instrument should follow the
Fig. 1.5 Contro! of tape tightening tension. Norma! forward drive mode.
eiieaia ae

Fast Reverse Winding
Control of Fast Reverse Winding Torque
Set’ the operating lever to fast reverse winding position.
The control is accomplished as shown in fig. 1.6, which
presents two optional modes of control.
30 mm radius
Force:
240-670g¢
80 mm radius
Fig. 1.6 Control of fast reverse winding torque. Fast reverse winding mode
Af the torque deviates from the specifications in the
figure, check and, if necessary, alter the pressure of
spring 261805. See fig. 1.7.
The difference between Fast Winding Torque and Fast
reverse Winding Torque shouid be ess than 130 g (force
measured at 30 mm radius), or 50 g (measured at 80 mm
radius). If necessary, alter the pressure of spring 261805
(fig. 1.7), or spring 26737 3B (fig. 1.1).
1.2 Brakes
See fig. 1.8.
Set the operating lever to normal forward drive position.
Check that the clearance between the brake pad and the
turntable is approx. 1 mm (0.04”). If necessary, adjust
screw D.
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
parts on operating arm 991017 lays between 0,5—1 mm
(0.02"—0.04”). If necessary, adjust screw C.
‘The adjustment prosedure is equal for both turntables.
1.3 Pressure Pad Adjustment
Set the operating lever 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, 1.9. If necessary, adjust the clearance by bending the
arm 254025 with a pair of pliers. See fig. 1.10.
4
Set the operating lever to normal forward drive position,
The pressure of the pad against the tape rest should be
80 g (2.8 oz) + 10 %, measured on the end of the
pressure pad arm 254025, See fig. 1.11. If necessary,
adjust the pressure by bending the spring 268062 with a
pair of pliers. See fig. 1.12.
7 ==
Fig. 2.7 261805
991034
{ 05-tmm
991017 (0.02"-0.08")
Fig. 1.8

251489 A 252784 2548448
Mst4 268062 284025 990325
254025 268062
Fig. 1.10
2514804 252754
80 g (2.82 oz) + 10%
314 268062 254025 2548444 = 990325
Fig. 1.11
254025 = 268062 990325
Fig. 1.12
1.4 End Stop Mechanism
1.4.1 Tape Feeler Tension
The feeler tension against the tape should lay between 8
and 10 g (0.28—0.35 oz) in drive and winding modes.
Adjustment of the tension is accomplished by tightening
or slackening the spring 248990. See fig. 1.14.
1.4.2 Adjustment of Tape Feeler
See fig. 1.13 and 1.14.
Set the operating lever in normal forward drive position,
or forward or reverse winding. The mains switch is set to
ON. No tape should be inserted. The tape feeler will
therefore rest in the position where the motor is
switched off, Push the feeler slowly through the guide
post. When the rear side of the feeler is min. 0,5 mm
(0.02”) from the polished contact surface of the guide
post the microswitch should close and start the motor. If
not, loosen screw F, and move the microswitch slowly
until the motor starts when the tape feeler is in the
position specified above. Then tighten the screw. When
the tape feeler is 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.
14,
AAA
Min 0,5.mm.
(0.02"")
Fig. 1.13
Adjustment distance minimum 0,5 mm (0.02)
2646944
F 243990
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
results on 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 frequency res
ponse and the signal-to-noise ratio.
2.1 Demagnetizing
Demagnetize the heads and adjacent paris 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 85.5 kHz
by mens of C404,
2.2.2 Erase Voltage
Set the tape recorder for stereo recording and connect a
VTVM to upper haif 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 Bias Current
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 22V by means of
R407. Check the voltage across lower head-half and
adjust to 22V by means of R410. Demagnetize heads and
tape path.
3.0 TAPE PATH
3.1 Visual Check
Load the recorder with a tape, and move the operating
lever slowly to the normal forward drive position. Check
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 that the bias
head is parallel to the record head.
Operate the start/stop button, and check that the tape
rans 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
correct. 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 is engaged. The
tape must, however, by no means bulge at the flanges.
6
ie) B
Fig. 3.1 Tape path adjustment screws
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 215568 to allow the latch to settle in
the position determined by spring 234478. 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
990334 with a screw driver as shown in fig. 3.2, until the
tape is running evenly through the rest of the tape path,
slightly touching one 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.
247941
990334 275563
Fig. 3.2 Azimuth adjustment of pressure roller

4.0 HEAD ALIGNMENT WITH TANDBERG
TEST TAPES, MODEL 6041X
4,1 Playback Head
Set the recorder for stereo. playback and connect a
VTVM to each one of the phono outputs.
4.1.1 Height Adjustment
Play Tandberg test tape No. 1. This is a full track
prerecorded tape with 1.000 Hz recorded at 7 1/2 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 endeavouring
to maintain the headfront parailel to the tape.
4.1.2 Azimuth Adjustment
Play Tandberg test tape No. 2. This is a full track
prerecorded tape with 10 000 or 15 000 Hz recorded at
71/2 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 Adjustment 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.
4.2.2 Height Adjustment by Track Measurement
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 spacings in 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 Adjustment
Load a new tape into the tape recorder and record at
tape speed 71/2 ips, a 15 000 Hz signal in stereo.
Depress both playback buttons and turn both playback
volume potentiometers to maximum, Adjust. both Line
Record Level knobs for approx. 150 mV at the outputs.
Adjust the record head azimuth serew for maximum
output from both channels simultaneously or best
compromise.
4.3 Bias Head
4.3.1 Vertical Adjustment
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 bias head as required.
4.3.2 Height Adjustment
Set the tape recorder in record mode, and unscrew the
locking screw (H) fig. 3.1, about 1/2 tun. Comnect a
VTVM across each 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 groove in 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,
raise the bias head slightly.
4.3.3 Horizontal Adjustment
Connect a VTIVM 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 increases to a
maximum, Continue pulling the head towards left side
until the bias is reduced by 10-15 % 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.
4.4 Erase Head
4.4.1 Height Adjustment
By visual inspection, check that approx, 0,25 mm (10
mils) of the upper half of the erase head is visible above
the tape. Insert Tandberg test tape No. 9 and record a
400 Hz signal at 7 1/2 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 erased track, Make sure that 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
serews (K) and (L) ref. fig. 3.1, and repeat the above
check.
4.4.2 Azimuth Adjustment
Check that the head front of the erase head is
perpendicular to the mounting plate. If necessary, adjust
azimuth position by means of the screws (K) ref. fig. 3.1.
This adjustment is not critical.
4.5 Model 6021X
The alignments specified in para. 4.0 are valid for the
mode! 6021X with the exception of. paragraph 4.1.1,
which is superseded by 5.1.1 and paragraph 4.2.1, which
is superseded by 6.2.2.

5.0 HEAD ALIGNMENT WITHOUT
TANDBERG TEST TAPES,
MODEL 6041X
5.1 Playback Head
5.1.1 Height Alignment
‘The height of the playback head is aligned by the height
adjustment screws (A), ref. fig. 3.1. The upper edge of
the tape shall run flush with the upper part of the head
lamination for channel L.
5.1.2 Azimuth 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,
5.2 Record Head
Follow the instructions given under paragraph 4.2.
5.3 Bias Head
Follow the instructions given under paragraph 4.3
5.4 Erase Head
5.4.1 Height Adjustment
The height of the erase head is aligned by the height
adjustment screws (K and L) ref. fig. 3.1. Approx. 0,25
mm (10 mils) of the ferrite core for the upper track of
the’erase head 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 erase head should be
parallel with the mounting plate for the heads. The
azimuth position of the erase head is not critical.
5.5 Modei 6021X
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, Paragraph 4.2.1 is superseded by
6.2.2. Paragraph 5.4.1 is superseded by 6.2.1.
6.0 TRACK CONTROL
6.1 Model 6041X
6.1.1 Record Head
Record a 1.000 Hz signal from a generator well above
optimum recording level in stereo A-test on tracks 1 and
2 for approx. 5 seconds, Turn the tape around and make
8
a similar recording on tracks 4 and 2. Cut the tape and
dip it into a mixture of fine grained iron oxyde powder
and alcoho! (Magna See solution) 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.
6.1.2 The 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 See solution, Check-that the
prerecorded track is in the centre of the erased area, ref,
fig. 6.2, Adjust the vertical position of the erase head if
necessary.
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
oom: pe Dee: Raise the playback head if the 1.000 Hz
heard. Lower the playback head if the 500 Hz
ea is i heard Recheck the azimuth position.
S————— SSS
st
SSS
Too high Too low
el
ms
eee
esr
Correct
Fig. 6.1 Track measurement of record head
Too high Too low
Correct
Fig. 6.2 Track measurement of erase head

6.2 Model 6021X
6.2.1 Erase Head
The
height
of
the
erase
head
is
aligned
by
the
adjustment
screws
(K
and
L)
ref.
fig.
3.1.
Record
a
1.000
Hz
signal
in
stereo
well
above
optimum
recording
level
on
2
fulltrack
prerecorded
tape.
Dip
the
tape
in
the
Magna
See
solution
and
check
that
the
tracks
are
distributed
symmetrically
across
the
tape,
Readjust
the
erase
and
the
record
heads,
if
necessary.
6.2.2 Record Head
The
height
of
the
record
head
is
aligned
by
the
height
adjustment
screws
(C).
Record
a
1.000
Hz
signal
in
stereo
well
above
optimum
recording
level
on
a
full-track
prerecorded
tape.
Dip
the
tape
in
Magna
See
solution
and
check
that
the
tracks
are
distributed
symmetrically
across
the
tape.
Readjust
the
erase
and
the
record
heads,
if
necessary.
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
edge
of
the
lamination
for
channel
L,
Readjust
the
azimuth
position
if
necessary.
7.0
ADJUSTMENT
AND
CONTROL
OF
THE
AMPLIFIERS.
7.1.1 Playback Level Adjustment
Connect
a
VT'VM
to
each
one
of
the
Phono
outputs,
and
turn
the
playback
volume
controls
to
maximum.
Set
the
recorder
for
7
1/2
ips
playback
of
Tandberg
test
tape
No,
4
and
adjust
R150
(L)
and
R250
{R)
for
1.5V
reading
on
both
vacuum
tube
voltmeters.
7.1.2 Adjustment of Bias Current
Insert
a
new
reel
of
good
quality
tape
(Low
Noise).
Connect
a
VI'VM
to
Line
Output
terminals,
and
signal
generator
to
Line
Input-terminals
and
set
the
generator
for
1.000
Hz
and
0.5
voit.
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
channel
VTVM.
Note:
The
2-track
model
is
aiso
equipped
with
individu-
ally
tuned
bias-
and
erase
heads.
The
values
of
C407,
C408
and
C126,
C226
are
labelled
on
the
bias»
and
erase
heads,
respectively.
The
capaci-
tances
are
given
in
pF.
Upper
number
refers
to
upper
track.
7.1.3 Record Levet Adjustment
Insert
a
new
tape
and
record
a
400
Hz
signal
at
7
1/2
ips
in
A-test.
Adjust
the
recording
levels
for
a
VTVM
indication
of
1.5V
at
both
phono
outputs.
Depress
the
Playback
buttons
(B-test)
and
adjust
the
recording
current
by
means
of
R208
(left
channel)
and
R208
(right
channel)
until
an
output
voltage
of
1.5
V
is
obtained.
7.1.4 Record/Playback Curves
Ref.
para.
8.2
for
adjustment
and
control
of
record/
playback
curves,
7.1.5
Indicator
Adjustment
in
Record
Mode
Setting
of
levels,
the
same
as
in
paragraph
7.1.3.
Adjust
R124
for
a
0
dB
reading
on
left
record
level
indicator
and
set
R224
for
the
same
reading
on
right
indicator,
Release
both
playback
buttons
and
check
that
the
output
voltage
is
still
2.5
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
3%,
If
distortion
exceeds
3%,
readjust
recording
level
and
indicator,
ref.
paras.
7.1.3
and
7.
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
R422
(L)
and
R445
(R)
until
both
level
indicators
read
0
dB.
7.1.8 Control of Playback Amplifier
Play
back
Tandberg
test
No.
3.
This
is
a
full
track
prerecorded
tape
‘with
the
following
frequencies:
250-10.000-5.000-1.000-100-56-250Hz
recorded
at
7
1/2
ips
tape
speed.
The
tape
conforms
with
the
N.A.B.
standard.
The
output
tolerances
are:
10kHz:0~
+4
db,
5
kHz:
+
1
—
+
3
dB.
The
other
frequencies
have
tolerances
+
2
dB.
The
difference
in
level
between
the
two
channels
should
be
less
than 3dB.

7.2 Tape Speed Control
7.2.1 Using Frequency Meter or Counter.
Connect a frequency meter or counter to phono Output
and play back Tandberg test tape No. 11 (1.000 Hz) at
71/2 ips tape speed. Difference from correct tape speed
is indicated in %.
Tolerance: +1%
7.2.2 Using Transformer and Vacuum Tube Voltmeter
Connect a transformer 115/0.5 V or 230/0.5 V, 50/60
Hz and a VEVM to the phono Output and the mains as
shown in fig. 7.1. Play back Tandberg test tape No. 10 a
(mains frequency 50 Hz) or No. 19 a (mains frequency
60 Hz) at 7 1/2 ips tape speed.
Deviation from correct tape speed will give a beat across
the VTVM, Turn the Output Level Control to obtain
adequate meter deflection.
Clock the time for 10 complete excursions of the meter
needle,
Read the speed deviation in per cent corresponding to
this particular Lime from the nomogram in fig. 7.2.
Brake left hand turntable slightly to decide if tape speed
is too high or too low. Increased deviation indicates too
low tape speed.
At 3 3/4 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: + 1%.
V.T.V.M
118, 60 H2
or oy ie i
50 or 60Hz ouTEY
230V, SOHz
°
Fig. 7.1
30 3 os gt 93 :
vanes ara f {AP speed ceviationttet
\ n Licetbastiud 1 LL LLL ford” copete
6 0 i820 25-0 a 80 BORD excursions.
Fig. 7.2
7.2.3 Using Tape of Known Length
Insert a tape of known length 450” (1144 em) and play
it back. Time taken for the whole length should be:
7 1/2 ips: 60 seconds
8 3/4 ip
17/8 ip.
Tolerance: 1 %.
10
8.0 ADJUSTMENT OF THE AMPLIFIERS
WITHOUT TANDBERG TEST TAPES
8.1 Playback and Record Level Adjustment
Connect 2 VTVM to each output terminal. The signal
generator is connected to the Line Jnput of both
channels and tuned to 400 Hz.
The tape recorder is set up for stereo recording A-test, at
71/2 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 meter and depress the playback push button
(B-test). Adjust the recording current by R108 until the
reading shows 3 % distortion.
Replace the VTVM for channel R with the distortion
meter and depress the push button playback ‘R (B-test).
Adjust the recording current by R208 until the reading
shows 8 % distortion. Connect a VTVM to each output
terminal and proceed the recording as discribed above in
stereo B-test.
Adjust R150 (channel L) and R250 (channel R) until the
reading on the output meters are 1.5 V, Make sure that
the playback volume controls are set to maximum,
Release the push-buttons Playback L and R (Stereo
A-test) and check that the reading on the output meters
still are 1.5 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 pass filter tuned to 85.5
kHz must be inserted between the output and the
voltmeters.
Set the tape recorder for 3 3/4 ips stereo recording, level
30 dB below optimum (0 dB). Use the output VTVM
reading as reference levels.
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 channe) L and R410 for channel R.
If the voltage is too low, alter the input signal frequency
to 1.000 Hz and adjust for maximum output voltage by
means of R407 and R410 for channels L and
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 deviate more than
+ 2 dB from reference level.
Perform the same check for 71/2 ips 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 400 Hz.
The output levels of the two channels should 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 7.1.3 and 7.1.4.
8.4 Distortion
Ref. para. 7.1.6 for adjustment and controi of distortion.

8.5 Control of Playback and Record Amplifiers
If the specified tolerances for frequency response are
exceeded, check the playback and record amplifiers.
8.5.1 Playback Amplifier
Connect a signal generator in series with a 1 kohm
resistor and a 100 uF capacitor and playback head, see
fig. 8.1.
33127)
Playb.
head
R135 (R235)
{ex}
Te
34(28)
Fig. 8.1
Connect also VTVM to each of the Line Outputs and set
playback volume control to maximum,
Set the tape recorder for stereo playback. To ensure
correct signal level, apply oscilioscope. Tune the gene-
rator to 400 Hz and adjust the level to 20 dB below 1.5
Vv, ie: be mV, Check the frequency response according
to fig. 8.2.
7
¢ pal
who Lt
(me i "
|e | i
a a a
Fig. 8.2 Playback curves
8.5.2 Record Amplifier
Connect a VTVM to each one of the head-halves as
shown in fig. 8.3 and a signal generator to Line Input for
each channel. Short-circuit trimming capacitor C404 in
oscillator. Set the tape recorder for stereo recording,
with input selectors to Line position. Set the level 30 dB
below 0 dB indicator deflection ic. 20 dB down on
signal generator, and 10 dB down by means of Record
Level Controls. Use 400 Hz as reference on VTVM
deflection. Check the frequency response according to
fig. 8.4.
R126(R226)
|—| l
er)
Fig. 8.4 Recording curves
8.6 Pick-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 10 400 Hz.
Adjust with Record Levei Controls to 150 mV output on
VTVM (2.6 V — + 20 dB). Check by means of
voltmeters connected to the phono output that the
frequency response conforms within a tolerance of 2 dB
with the RIAA curve shown in fig. 8.5.
Fig. 8.5 RIAA curve for magnetic pick-up
11

a a i ee ee ee
Fig. 8.6 Total frequency response tolerances according
to DIN 45511
8.7 Limiter
Set both volume controls to maximum.
8,7.1 Adjustment of Li ing Threshold
Set the input and outputcontrolsto maximum. Feed 400
Hz signals into the Line Inputs in amplifier mode and set
the level to 0 dB on the indicators. Depress LIMIT
button and adjust both R320 for + 1 dB reading on the
indicators. Increase the input 20 dB and check that
indicator reading does not increase by more than approx.
2 dB.
8.7.2 Adjustment of Release Time
Connect an oscilloscope with calibrated time scale to the
phono output. Feed 400 Hz signals into the line input,
and set signal levels for 0 dB reading on the indicators.
Depress LIMIT button, and increase the signal level by
20 dB.
Then abruptly decrease the level by 20 dB, and deter-
mine by means of the oscilloscope pattern the time taken
for the output signal to retum to approx. 1 dB below
norma! level on indicator.
See fig. 8.7. Adjust the time to 0.7 s by means of R311.
a
ae
gash
208
Fig.
8.7
9.0 MODIFICATIONS
9.1 Modification from 230/115V 50 Hz to
230/115V 60 Hz operation
The transformer must be rewired when changing from 50
Hz to 60 Hz or 230V to 115V operation, while motor
pulley and motor capacitor have to be changed. Connect
as shown in fig. 9.1—9.2 and description below,
230V connections
230V, 50 Hz: Motor puliey, part No.: 245771. Motor
capacitor: 2 uF, oil paper 5% 320V. Champ
for motor capacitor, part No. : 263184.
230V, 60 Hz: Motor pulley, part No.: 247452. Motor
capacitor: 1,5 uF, oi! paper 5% 320V.
Clamp for motor capacitor, part No.:
263184.
Motor enpacties
“to mans power sion
Fig. 9.1 230 V motor and transformer connections

115V connections
115V, 50 Hz: Motor pulley, part No.: 245771. Motor
capacitor: 8 uF, oil paper 5 % 220V. Clamp
for motor capacitor, part No.: 991040.
115V, 60 Hz: Motor pulley, part No.: 247452. Motor
capacitor: 6,5 uF, oil paper 5 % 220V.
Clamp for motor, part No.: 206713,
When ordering motor pulley or clamp for motor capaci-
tor, specify the part number.
287746
panne 20502
"To rainy power waitoh
Fig. 9.2 115 V motor and transformer connections
9.2 Modification from Four-Track to Two-Track
Version
The following components have to be changed when
modifying from four-track to two-track. The value of
total capacitance is labeled on two-track heads.
10.0 LUBRICATION
The Motor:
The motor should be lubricated after approximately
every 3000 hours of use.
The upper and the lower bearing should be lubricated
with a Teresso oil 43 or 47 from Esso.
Part Four-Track Two-Track
Record head C04-11R F82-07R
Playback head | C03-10P F83-11P
Erase head D84-18E D87-20E
Bias head D90-03B D92-04B
C126 250 pF Add capacitance
226 250 pF until value
C407 3300 pF labeled on head
C408 3300 pF is obtained
The numbers indicating the heads are ordering numbers
for the heads.
9.3. Important Electrical Modifications
Introduced in Series G000X
From serial number 2803700 output impedance were
altered from 10 kohm to 5 kohm to meet DIN
specifications 45511. The following components were
modified:
R423 changed from 22 kohm to 10
R428 changed from 22 kohm to 10
R429 changed from 22 kohm to 10
R432 changed from 22 kohm to 10 kohm
R434 changed from 82 kohm to 47 kohm
R435 changed from 10 kohm to 5,6 kohm
R436 changed from 82 kohm to 47 kohm
R437 changed from 10 kohm to 5,6 kohm
kohm
kohm
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 base to emitter of Q305,
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
Teresso oil 43 or 47 from Esso.
Noie: 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.
13

11.0 ILLUSTRATIONS WITH REFERENCE PART NUMBERS
262522 991007 260929
262674 261655 260153 261655 991006 2690700
261345,
261655
262674 SS
REBATES
263105
202984 4
261685, H
2629B4—~7 263709
264665
201s
2634937
f
oe
262064
TEAK
264564 ROSEW. .
264355 263026 262584 264665 VERTICAL POSITION 269772 NUT
261460" 260184
262874
Fig. 11.1. Top exterior view
230629B 240275, 259600
263105 ; ¥ x was ey 264786 t
264894 7 ee j @. ee: a 2E4B94
7 at Ae ig
269786 wae a : ; “269786
REOSTSE& 264850 264449
264449 264850 256864 248495 261970 266777A 264190
finely) pecotaanser)
991026 991026
Fig. 11.2. Rear view
14

990305 een77s (BOHz) 262969 991041 991045
* 247452 (EOH2) — / 242533 | 999204
990233
269786 — Ce - Erg 269786
4973
aN
:
i
ae
i
.
497:
264973 -— % re bee y : E 264973
2021514
991034
991014
—
e911
991013
991015
~
990312
264270
265709
260045
RE3932
260155
—~
264595
261345
991050
260828
259881
1 N \
RIOVI104/ — B 201/204/ 228244 | 263493,
106/07 206/207 260828 = 260131 26460 262532 263026
Fig. 11.3. Top view with covers removed
252754 18E-D84 11R-COS — 102-COB 262854 4E94A
BSHBGA | BESHtA: | 25275 252754 | 260735 / 991027, agent
242309
ce aed
Sk a
y z
04B-DS2 \ roost? \ 24ed42a \
219254 264514 230183: 990334
Fig. 11.4. Tape path and pressure roller arm
15

208222 260620 262782 991012 262531 263184 (1,5-2pF) 291000
264542
264003 2635888
211339
263134 257517
991002 991001
260289
265462
269786 + Ne finh | z 269786
991004 991005 262236 257746
Fig, 11.5. Bottom view
991008 213997 245771 (SOH2) 262322 © 262969 990204 991034
990233 247452 (60H2) 990305 | 262854 / 242331 / 991045 202181
264973
264973
991014
991014
262193
—.
991023
265309
264270
= . ; E 5
260124
—
i
{
:
-
263522
. —~ 991017
a
a y,
Riciio4/ 268932 ©
106/107
\ i fe
“204 268932\ 260131 | 261460\ 260131 | BSt4 | 263486 \ 259881
\ : \ 1
206/207 J61453 25988! 263493 255886 990312 261647 264420
Fig. 11.6, Top view with upper mounting plate removed
16

248027. 202151| 207977 260706 261094
262509
991027 242503 244694 A 26393524
Fig. 11.7. Upper mounting plate seen from underneath
12.0 SPARE PARTS LIST FOR TANDBERG TAPE RECORDER 6000X.
The numbers of the mechanical parts on the figures are Note: Apply part reference numbers when ordering spare
identical with the numbers. on the parts in store. Parts parts.
shown on the figures without existing in the parts list are
not available as spare parts.
12.1 Mechanical parts:
Ref.No. | Description [ Usage Notes
201957 | Shaft Pressure pad arm
202008 | Mains cable 115 V, 7FT
202151 | Microswitch
202309 | Shaft Eccentric segment
203250 | Mains cable 230 V 220cm w/plug
206296 Window Counter
206713 | Clamp Motor capacitor 6,5uF
207977 | Roller Eccen. segment
208222 | Transformer Microphone T301
208724 | Clamp Mains cable
209306 | Spring Transfer wheel arm
211339 Pulley Revolution counter
211418 Shaft Lever
212036 | Holder Operating lever
212066 | Nut Cabinet
215953 Pulley Turntable
216599 | Fin Cooling
217783 | Retainer Tape reel
218767 Nut Turntable shaft
219234 | Shaft Pressure roller arm assembly
219816 | Flange Turntabie housing L&R
WwW

18
Ref. No. Description Usage Notes
224186 Screw Vertical mounting feet
224795 Support Sound-on-Sound switch
228244 Connector Microphone
230183 Shield Playback head
230629B | Roller Stop arm
234960 Washer Speed selector shaft
237482 Spring Support, erase head
240275 Connector Radio — P.up — Line
240276A | Screw End stop
240406 Spring Record-playback head adi.
240879A j Plate Transfer wire
242309 Spring End stop, transfer arm
242331 Spring Cam dise arm
242503 Am End stop
243013 Tape guide Right
243150 Arm Bias head
243990 Spring End stop arm
2448424 | Arm End stop switch
244694A | Lever End stop
245364 Suppressor Start-stop switch
245771 Pulley Motor, 50 Hz
246231 Clamp End stop switch wires
246691 Washer Rec. potm.
247395 Clip 9 mm (3/8")
247452 Pulley Motor, 60 Hz
247941 Shaft Pressure roller
248027 Insulator End stop switch
248157 Bushing Adj. tape guide
248495 Connector 26V
249306 Suppressor End stop switch
249551 Guide End stop lever
249737 Clip 12.5 mm (1/2”)
251130 Link Pressure pad arm
251489A | Arm Tape rest
262115 Switch Equalization
252172 Bearing Flywheel
252496 Clamp
252764 Tape guide Adj.
254025 Arm Pressure pad
254844A | Support Pressure pad/tape
255886 Push button switch Assy.
256864 Connector Remote control
257617 Drive belt Counter
257746 Motor 115/230 V 50/60 Hz
259529 Lamp Counter and meter. 24 V 1W
259600 Selector switch Pick-up
259758 Connector Phono
259773 Plate Fastening, printboard
259881 dack Microphone, US version
260045 Meter Record and playback-level indicator
260124 Transfer arm Input switch
260131 | Button Limiter-playback-stop
260153 Am Input switch control, right
260289 Side plate Right
260290 Tape support Neut. position
260361 Friction ring Clutch LER
260421 Washer Neoprene, start/stop solenoid
260476 Spring Input switch
260577 Bearing Flutter filter
260620 Panel Front
260641 Knob Operating lever
260700 Knob Cueing control
260706 Eccentric arm
260735 Screw Tape guide
260828 Bracket Support, input switchr
260850 Lever Start/stop solenoid
260929 Cover plate Rear
260950 Terminal plug 7 pins

Ref. No. | Description Usage Notes
260965 Spring Cueing arm
261052 Socket Lamp meter
261072 Tension spring Pressure roller cover
261094 Guide Operating lever, pe.
261216 Adj. screw Clutch-and-breake levers
261302 Terminal connector 7 pins
261303 Screw Cover front
261345 Input switch Control arm, left
261453 Input switch Stop control
261460 Button Record, right channel
261525 Stud Lifting arm
261647 Transfer arm Control Sound-on-Sound switch
261655 Screw Cover rear, japanned
261805 Coil spring Left clutch dise
261841 Coil spring Clutch and brake ievers
261885 Screw End stop, feeler arm
261913 Spacer Pick-up switch
261970 Cover Bottom
261992 | Dise ‘Thrust, bearing fly wheel
261999 Spacer post Push button assy.
262064 Cabinet Teak
262157 Spacer Push button assy.
262193 Slide plate Stainless steel
262215 Shield Line input board
262236 Clamp Support, motor
262244 Steel ball Transfer arm input switch
262258 Roller Flutter filter
262322 Knob Speed selector
262402 Contact spring Counterlamp holder
262481 Am Tape brake
262509 | Lamp shield
262531 Armature Start/stop solenoid
262532 Guide plate Push buttons
262645 Holder Speed selector arm spring
262674 Knob Upper, rec/output lever control
262739 Spring Lower, operating lever
262782 Frame Main board holder
262833 Spring Pull rod
262854 Arm Speed selector
262969 Plate Speed selector
262983 Terminal plug 3 pins
262984 Screw Cabinet 5/8”
263026 Control arm Switch, Sound-on-Sound
263105 Side plate Right
263184 Bracket PC boards
263184 Clamp Motor capacitor 1.5—-2uF
263278 Bracket Power switch
268335 Plate Retainer, flywheet bearing, lower
263486 ‘Transfer arm Sound-on-Sound switch
263493 Button Record Jeft
263522 Spring Upper, operating lever
263688 Screw Topplate. 3 x 8 mm countersunk
263709 Button Power switch
263817 Switch Sound-on-Sound
263833 Spacer Function selector switch, small
263874 Bushing Plastic, operating lever
263888 Power switch Without button
263896 Shield Radio connector
263932 Guide Power switch button
264003 Side plate Left
264054 | Spring Bias head arm
264083A | Tube Friction disc.
264126 Spacer Neoprene, start/stop solenoid
264162 Tape brake Insure rubber
264169 Top plate Front
264190 Holder Mains phig, rear panel
264212 Screw Start/stop solenoid adj.
264226 Guide Slidearm
264370 Counter
264355 Knob Lower, rec/out level contr.
264420 Sleeve Slide arm damping
264427 Wafer Sound-on-Sound switch
264485 Insulator Motor terminal
19