Tandberg 6000-X Service manual

JANDBERG

Serles

6OOOX

SER\/IGE

MANUAL

TANDBERGS

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RADIOFABRIKK

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CONTENTS

7.0

Mechanical

1.0

1.1

1.2 Brakes

I

tt

I

t'>,

1.3 Pressure Pad Adjustment

1.4

2.0

Alignment

2.1 Demagnetizing

2.2 Bias-

Tape Path

3.0

3.1 Visual

3.2 Mechanical Adjustment of Tape Head Alignment

4.0

Model

4.1 Playback Head

4.2

4.3 Bias Head

4.4 Erase Head

4.5 Model6021X Head Alignment

5.0

Model

5.1

5.2

5.3 Bias Head

5.4 Erase Head

5.5 Model

6.0 Track

6.1 Model

6.2

Adjustments

Clutches

1.1.1 Take-up T\rrntable

1.1.2

Supply

End

Stop

1.4.1 Tape Feeler Tension

1.4.2 Adjustment

and

2.2.1 Oscillator Frequency

2.2.2

Erase

2.2.3 Bias

6041X

Height

4.1.1 Azimuth

4.1.2

Record

4.2.1 Height Adjustment by

4.2.2

4.3.1 Vertical Adjustment Height Adjustment

4.3.2

4.3.3

4.4.1 Height Adjustment

4.4.2

6041X

Playback

5.1.1 Height Alignment

5.1.2 Azimuth Alignment Record

5.4.1 Height Adjustment

5.4.2 Azimuth Adjustment Control

6.1.1 Record Head

6.1.2

6.1.3 Playback Head

Model

6.2.1 Erase Head

6.2.2

6.2.3 Playback tlead

T\rrntable

Mechanism

of Tape Feeler

Erase Circuits

Voltage

Current

Check

Tandberg Test Tapes

with

Adjustment

Head

Visual Inspection Height

Adjustment

Measurement

Track

Horizontal Adjustment

Azimuth Adjustment

Without

Head

6021X 6041X

Erase Head

6021X

Record

Head

by

Tandberg Test Tapes,

Path

Adjustment

7.1.1 Playback Level

7.1.2

7.1.3

7.1.4

7.1.5

7.1.6 Distortion

7.1.7

7.1.8

7.2

Tape Speed

7.2.1

7.2.2

8.0

9.0 Modifications

10.0 Lubrication

11.0 Illustrations

12.0

13.0 Transistor

14.0 Block

15.0

7.2.3

Adjustment

Tandberg

8.1 Playback Record/Playback Curves

8.2

8.3

Readjustment Indicators

8.4 Distortion

8.5

Control

8.5.1 Playback Amplifier

8.5.2

8.6 Pick-up

8.7 Limiter

8.7.1

8.7.2

9.1 Modification

to 230/115V Modification

9.2

to Two-Track

9.3 Important Introduced

Spare Parts Tape

12.1

12.2

12.3

Printed Wiring Boards and

and Control of the Amplifiers

Adjustment Record Level Record/Playback Curves Indicator Adjustment

Indicator Adjustment and Amplifier Modes Control of the Playback

Using Frequency Meter Using Transformer Voltmeter Using Tape of Known

of the Amplifiers, without

Test Tapes

and Record Level

of Playback and Record Amplifiers

Record Amplifier

Amplifier

Adjustment of Limiting Threshold

Adjustment of Release Time

with

List for Tandberg

Recorder 6000X Mechanical Parts Screws, Electrical Components

12.3.1 Transistors

12.3.2 Diodes

12.3.3 Rectifier 1

12.3.5 Poientiometers

12.3.6 Heads

12.3.7 Transfonners

Washers, Nuts and Circlips

2.3.4

Trimming

and Diode

Diagram

Adjustment

of Bias Current

Adjustment

in Record Mode in Playback

Control 10

Record Levels

of

Curve

230/115V

from

Hz

60

operation

from Four-Track

Venion

Electrical Modifications

in

Series 6000X

Reference

Capacitor

Identification 6000X

Series

Amplifier I

or Counter 10

and Vacuum

Length

Adjustment

and

50 Hz

Part

Numbers

lViring Diagram

Ttrbe

9 I 9 9 I 9 I

9

10 10

10 10 10

10 10 11 11 11 11 12 72 12

t2 13 13

13 I4

1.7 77 2L 21 2L 22 22

9'

,t

22 22

23 23 24

^

1.0

MECHANICAL ADJUSTMENT

1.1

Clutches

1.1.1

Take-up Turntable

Normal

Set

the operating

with

the motor running. between the table

and friction disc (0.02"-0.035"). fig.

1.1.

Forward

polyurethane

drive

lever

to

991009 lays between

If necessary, adjust

normal forward

Ensure that

friction

drive

pads

the clearance

under

screw A as

position

the turn-

0,5-0,9

shown in

mm

0,5-0.9

mm

{0.02"-0.35")

1

991 034

L

-

I

Control Note:

The presents

of Winding

All

controls

with the tape recorder

tion

control is

with

and

accomplished

two

optional modes

Torque

and measurements

empty

30 mm

reels

as

of

radius

placed

only.

shown

control.

must be carried out

in

horizontal

in

fig.

Force:

4O-80g

posi-

1.2, which

991017

Fig.1.1

il

-

991013

80

.rl

mm radius

Force:

15-30g

.arl

4

While measuring,

rotation. The instrument should

slow movement in a straight

der.

Fig. 1.2 Control of winding force.

Fast Forward

Control of Fast Winding Set

the operating lever The control is presents

Winding

two optional

the reel should be allowed

line

Torque

fast

to

accomplished as

modes of control,

forward

shown

follow the

tape

towards

Normal forward

the

winding

in fig.

1.3, which

to have a

recor-

drive

position.

Notc:

mode.

After a operation, 20-30V"

longer

an increase

considered

is

period

normal.

as

of

the

continuous

torque by

+i

I

mm radius

\

30

80 mm radius

^

Force:

90-2509

\

\F

't\

Fig. 1.3 Control of

If the torque deviates figure, check and, if

2673738.

spring

fast winding

necessary, alter the

torque. Fast forward winding mode

from

the specifications in the

pressure

of

Ensure that there is a clearance between the studs on friction disc 991010

and

lever

991013.

See fig. 1.4.

min 0,1 (0.091")

mm

1.1.2 Supply Turntable Tape

Control

of

Set the operating The

control

presents

is accomplished optional modes

two

Tightening

lever to normal

Tension

forward drive

as shown

of

control.

30 mm radius

in

fig.

position.

which

1.5,

991017

Fig. 1.4

991013

991OlO

261805

80 mm radius

Force: O-99o

the

While measuring, movement in a

straight

reel should

the

line towards

be

allowed

the tape recorder.

to

have a slow

rotation. The

instrument should

follow

F

Fig. 1.5 Control of tape

tightening tension.

Normal forward drive mode.

Fast

Reverse

Control Set

the

The

control

presents

Winding

of Fast

operating

is

accomplished

two

optional

Force:

240-67

Reverse

lever

modes

0g

Winding

to fast

as

of

30

Torque

reverse

shown in

control.

mm radius

winding position.

fig.

1.6,

which

Force:

90-250g

80 mm

J

radius

1F{

Fig.

1.6 control

If the figure, spring 261805.

The reverse measured

1a--dius! (fig.

1.2

See Set the

Check tumtable

screw Set the

reverse between parts (0.02"-0.04").

The

torque check

difference

Winding

at

30 mm

If

necessary,

1.7),

or spring

Brakes

fig.

1.8. operating

that the

is

approx.

D.

operating

winding

screw

on

operating

adjustment prosedure

of fast

reverse

deviates

and, if

See fig.

between

Torque

clearance

respectively.

C If

necessary,

1.7.

should

radius),

alter

2673738

lever

to

1 mm

lever

to fast

and the

arm

991012

necessary,

winding

from

the specifications

Fast

Winding

be lesi

g (measured

or 50

p.esiu.e

the

(fig.

1.1).

normal

between

is

(0.04").

forward

Ensure

bottom

lays

adjust

equal for

forward

the

of

screw

torque.

alter the

Torque

than

of

brake

If

necesiary,

that

the

between

both turntables.

pressure

180 g (force

spring

drive

pad^

winding

the hinged

0,b-1

C.

Fast

at

position.

clearance

reverse

in

the

and Fast

g0

mm

261g0b

and

the

adjust

or fast

delrin

mm

of

winding

Set

the operating

pressure

The

g (2.8

80 pressure adjust pair

of

Fig.

1.7

mode

pad

pressure

the

pliers.

of the

oz) !

arm

See fig.

lever

pad

tO 7o,

254025. by

bending

1.12.

to

normal forward

against

the

measured

See fig.

the

tape rest

on

the

1.11.

spring

position.

drive

slould

end

If

necessary,

268062

be

of the

with-a

.)fl

1.3

Pressure

Set the between 254844 fig.

1-.!. If

arm

254025

Pad

operating

pressure

the

should

be approx.

necessary,

with

Adjustment

lever

to neutral position.

pad

990325

6,5 mm

adju,st

of

the

pliers.

a

pair

and

(1/4")

clearance

See fig.

The

clearance

the

tape rest

as

shown in

by bending

1.10.

the

Fig.

1.8

991Ol7

(0.02"-0.04")

i)c

Mechanisrn

StoP

End

1.4

A

251489

-

(1/4").

mm

6,5

1.9

Fig.

;

I

TaPe

1.4.1 feeler

The

i;';

;; Adiustment ;'"i;t;;;iline.p'l"g

Adlustment

1.4.2

1.13

fig.

See S.; or bN."ff;di

ir,i;"i';"

ffi;; oost.

id;t";'ii"*

i"".","1t*'-"";#qt.l""F*iml*n3iiil".n';"i

operating

il:

forward

"T;-i;

When

loosen

not,

the

until

",i.iirJii""i""iri"a

fi;;';;;;

and feeler

(0.02"). See

stop

fig.

ii"r"t

and

1.14.

Tension

Feeler

the

of

and

reverse

or

.r'"ura

p.ro

the

ttt"

screw

against

of

1.14' lever

rear

startJ-

tension

to.ie-o.fs

oii.

motor

it

motor

the

arm

the

tape

the

a'ii"

in

o')

tensioit

porislea-"ontact

released,

ii accomptishgd-u.v

243eeo'

Feeler

TaPe

normal

in

winding'

;;-;;e;hd'

*,J-poiiti"rr

tt'"

tla"

r'.i

"u"u"'

when

244694A-

t!"tet

"f

when

irten

the

Th-e

slowlv-

the

microswitch

see

forward

tighten

spacing.

shouldlay.between

winding

and.

1'14'

fig'

mains.switch

tape

rhe

Yh:T"--ll3

through

feeler-is

surface

feeler

tape

the

-

between

minimum

is

tightening

drive

reeler

min'

of

screw'

should

modes'

position'

set

is

motor

guide

the

0'5

guide

the

is in

When open'

the

(

0'5

8

to

will

is

mm

the

tape mm

F\

1.10

Fig.

1

80

g

(2.82

oz)

t0%

Min 0,5 {0.02")

mm

@

1.13

!f

1.11

Fig.

DF

Fig.

1.12

Fig.

1.14

2.0

ALIGNMENT

-

It is-important heads

on.the

results

on tape recorder the tape ponse

2.1

Demagnetize the

2.2

2.2.1

Connect kHz), oscillator erase by mens

2.2.2

Set the

VTVM low-capacitance Then headhalf. Set check The recording

recording

2.2.3

Set the of a VTVM. R407. adjust tape

new

polished

and the

Demagnetizing

heads.

Bias-

Oscillator

head. Adjust

Era* Voltage

check that

the

deviation from

Btas Current

the voltage

path.

the

and

calibrated

a

frequency

by

means

of C404.

tape recorder

to

upper

tape recorder

the voltage

should

on

channel R.

recorder

tape

across

Adjust

Check

to 22Y

by

the

that

tape

tapes,

approx.

signal-to-noise

Erase

Frequency

probe.

the

contact

recorder

the

tape should

5 times

before

heads

measuring

and

Circuits

long

meter

half of

the same voltage

across

not exceed

upper

means

wave receiver

or frequency

pick-up

of

a

the

oscillator frequency

for

stereo recording

the

The

for recording

upper half

the voltage

for

stereo recording

half of the

the

voltage

of R410. Demagnetize

between

good.

is

ratio.

adjacent

voltage

across lower

To

be run

at normal

the

parts

placed

loop

erase head

should appears

on channel

of the erase

measured

10V.

Proceed

bias head

to 22Y

the

tape

obtain

optimum

through

speed

friquency

before

(tuned counter

to

around

to 8b.b kHz

and connect

by

means

be 80-120V.

across lower

in

similarly

and measure

by means means of

by

head-half

heads

and

the

to

have

res-

aligning

256.5 the

to

the

of a

L

and

head.

stereo

for

and and

IHMD

Fig.

3.1 Tape

3.2

Mechanical

Prior essential ment

Set the operating screw holding

position

the

a

the

screw. The

the_ upper

247941. Put

a tape free

way and

position,

99033.1 tapg

ls

$ightly located

Align pressure perfectly.

path

to the

through

running

guide

electrical

to make the

the

latch 215563

determined

spring

and lower

from

set the operating

Adjust the

with

a screw

touching

adjacent to the

evenly through

post

roller

spring

2, 3,

adjustment

screws

adjustment

tape

path.

lever

on-e of the

run

to neutral

to

by

spring

pressure

points

damages

lever azimuth driver

as shown in fig.

capstan.

and

4 similarly.

234478

flanges

of tape

without

allow the latch

will

of

on the

to normal forward

position

the

to make

path

of the

sideways

position.

284478. now

be equal

pressure

recorder

pressure

of

rest of

the tape

of the tape

If necessary,

the

Unscrew

Then tighten

roller

3.2, until

heads,

it

move-

to settle in

against

pivot

in

normal

drive

roller

path,

post

adjust

tape

-<l

is

the

1

run

3.0 TAPE

3.1

Visual

Load

the recorder

lever

dowly

that

the screws (C) tape

head

Operate runs

without Check cor:ect. flanges forward tape

bias

against

parallel

is

the start/stop

within

flickering

that

It

of

the

drive,

must,

however,

PATH

Check

with

normal

record

button,

of the

on

neither

tolerated

posts

drive

by

no means

a t-ape,

head

head.

when

to

the

head neither

on

the record

the

record

to the

the rims

height positioning

can

be

guide

or

as the

and

forward

touches

base Also

head.

and check

pressure

side

of

that

the recorder

mechanism

bulge

move

position.

drive

the height

plate,

nor

check

pressure

of the

guide

the

the tape

is

at the

the

operating

adjustment

presses

thit

the

that the

wheel

rubber

wheel.

posts

touches

is in

normal

engaged.

flanges.

Checi

the

bias

tape

the

The

ln

is

rll'\

Fig.

3.2

Azimuth

adjustment

pressure

of

roller

--

(?4;

$'rF

4.0

HEAD ALIGNMENT WITH TEST TAPES, MODEL

4.1 Playback

Set

the

VTVM to

4.1.1

Height Adiustment

Play

Tandberg

prerecorded and with the approx. by means obtained from

to

maintain the headfront

4.1.2

Azlmuth

Play

Tandberg

prerecorded

7 tl2

ips. Adjust

head

by means

indication

4.2 Record

4.2.1

Height

Insert a new forward

parallel

run

play

a

of approx.

the

height with screws

maintain the headfront

4.2.2Heighl

Record direction, then and

dip

powder visible

Fig.6.1 patterns

high Adjust

and

as

or too low.

as

Head

recorder

each one of the

30 dB.

of

on

drive.

in

stereo,

it

four

shows

obtained

above

for stereo

phono

test tape No.

tape with

area corresponding

the

track 3

Adjustment

tape with 10

the VTVM

Head

Adiustment

tape, and start the recorder in

Check visually that

with the upper

Adiustment

in the opposite. Cut

into

alcohol

dark stripes

the

1.000 Hz recorded

Adjust the

screws

test tape No. 2.

the azimuth

of the

0,1 mm

well above

a solution

(Magna

correct

when the head is

and

height of

(A)

(channel

parallel

000 or 15

screw

is

obtained.

by Visual Inspection

track of the record head,

(4

(C)

fig.

parallel

by Track Meaurement

See). The

with spacings in lighter

pattern

perform

TANDBERG

6041X

playback

outputs.

1. This to track

the

until minimum

R),

while endeavourlng

to

the tape.

This is a full

000 Hz

position

(B),

the tape appears to

If

mils).

while

3.1, to the tape.

normal level, first in

off

grained

fine

of

a

tracks will

on the tape positioned

new track

connect

and

is a full

at

3 reduced

playback

recorded

of the

until

necessary,

endeavouring

a length of tape

iron

measurement.

track

7 ll2

ips,

by

head

output is

track

playback

maximum

normal

with

adjust

one

oxyde

then

shade.

and the

either

too

4.3.2 Height

Set

the locking screw VTVM the

bias

M

a

at

to

be

for the Check that the bias head between the record head. The height critical, and the mounting raise the

4.3.3 Horizontal Adjustment

Connect headhalves, ing. Insert the

bias head to the right. Then screwdriver towards the left hand side. Induced voltage maximum. Continue until the When the (H)

while maintaining correct head. change repeated.

4.4

Erase Head

4.4.1 Height

By

visual inspection, mils) of the the tape. Insert Tandberg

4OO Hz channel R grained solution). centre of the adjacent tracks adjust the height screws check.

Adjustment

tape recorder

(H)

across each one

head

highest

the tape runs freely in

bias head slightly.

a VTVM across each one of the record

and

a screwdriver in

pull

the

bias

position

Then

recheck the output

has

occured, the horizontal

upper half of

signal

(track

iron

Check that

(K)

and

fig.

up or down

possible

and that

head

bias

if the clearance

plate

for

set the tape

bias head carefully

(bias)

pulling

is reduced

has

Adjustment

check that

at 7 Ll2 ips well

3). Dip

oxyde

erased track.

powder

the recorded

are

erased, see fig.

of the

(L)

ref.

in record mode,

3.1, about record

of the

means

by

reading

there

the

and

position

between

record

the

recorder

groove

in recording head

the head towards left side

10-15 7o

by

found,

been

horizontal

the erase head is visible

test tape No.

the tape in

and

Make sure

erase

fig. 3.1,

and unscrew the

turn.

1/2

head

of adjustment screw

on

groove

the

is

sufficient

mounting

of

bias

the

head is insufficient,

for stereo record-

I,

ref. fig.

by

below

thigthen

voltage. If

above

head

position

procedure

approx.

normal

a solution

alcohol

is

track

that

6.2. by means

and repeat the

Connect a

halves. Move

the

voltmeter.

in front

clearance

plate

for

head is

bias

head and

3.1, and

means

increases to

a noticeable

0,25

9 and record

(Magna

positioned

parts

no

If necessary,

pull

of

maximum.

the

screw

of

has to be

mm

above

level on

fine

of

above

of

the

not

the

a

the

(10

a

See

in

the the

D

{^

4.2.3

Azimuth

Load a new tape speed 7 Ll2 Depress volume Record Adjust output from compromise.

4.3

Bias

4.3.1

Vertical Adiustment

Move

the operating

position

drive record

heads are

the bias head as required.

Adiustment

tape into

ips, a 15 000

playback

both potentiometers l,evel knobs for

the record head

both channels simultaneously or

Head

lever

and check that

parallel.

the tape

buttons and turn to maximum. Adjust

approx. 150 mV

recorder

Hz

signal in

azimuth

slowly to the normal forward

If

screw for

head fronts of

the

necessary,

and

both

the outputs.

at

bend

record

playback

both Line maximum

bias- and

the arm of

at

stereo.

best

4.4.2 Azimuth Check

perpendicular azimuth This

adjustment

that

the to

position

Adlustment

head

the

mounting

by means

not

is

critical.

front of

plate.

the

of

4.5 Model 6021X

The

alignments specified model 6021X with the exception which is is superseded

supenseded by 5.1.1 and

by 6.2.2.

in

para.

erase

the

If necessar5r,

(K)

screws

4.0

are

paragraph

of

paragraph

ref.

valid

4.2.1,

head is

adjust

3.1.

fig.

for the

4.1.1,

which

5.0 HEAD

ALIGNMENT

TANDBERG

MODEL

5.1 Playback

Head

TEST

6041X

WITHOUT

TAPES,

a similar dip and alcohol visible. distributed

Readjust the the azimuth

recording on

it into a mixture of

(Magna

The

spaces

equidistant across alignment.

between

height

4 and 2.

tracks

glained

fine

See solution)

the recorded

position,

if necessary,

Cut the

iron oxyde

to make

the tape, ref.

the recording

tracks

and

tape

powder

should

fig.6.1.

recheck

and

be

back

meters.

Head

the

Alignment

the

of

screws

run

for channel

Alignment

a standard

head until

Head

instructions

5.1.1 Height

The height adjustment the tape shall lamination

5.1.2 Azimuth Play

VTVM connected

playback

the

fig. 3.1,

ref.

output

5.2 Record

Follow the

5.3 Bias

Follow

playback head

(A), ref. fig. 3.1.

with the upper

flush

L.

azimuth

to each

the

by maximum

given

is aligned by

alignment

output. Adjust the

azimuth

reading

under

the height

The upper

part

adjustment screw

obtained

is

paragraph

paragpaph

edge of

the head

of

tape

position

4.2.

4.3

with

on

6.1.2

Insert a Hz signal ing level in mono and dip

a

prereeorded

of

(B)

the

fig.6.2. Adjust necessarv.

6.1.3 Record a 1.000

500 Hz

recording levels.

track 2

should

signal signal is heard.

The Erase

Playback

be heard. Raise

is heard. Lower

Head

full-track

from a

it into

(channel

generator, well

the

track is

the

Head

Hz signal on

on

signal

Turn the

Recheck the azimuth

prerecorded tape and

on

track

Magna

in the

vertical

track 3

R)

at

the

above

(channel

3

See

solution.

centre of the

position

tape

maximum

playback

of the

1

track

(channel

around

head

position.

(channel

volume.

head

record

optimum

R). Cut

R)

the

Check'that

erased area,

erase head

L) and

at

optimum

play

and

No signal

if

1.000

the

if the 500

a 1'000

record'

tape

the

ref'

if

,-t

a

back

Hz Hz

Head

Erase

5.4

screws

mils)

Azimuth

azimuth adjustment with position

6021X

Adjustment

of

of the ferite

should

Adjustment

the

with the exception of

CONTROL

5.4.1 Height

The height

adiustment

min

tfO

erase head

the

5.4.2

Align the azimuth parallel azimuth

Model 6021X

5.5

The alignments model is superseded by

6.2.2.Paragraph

TRACK

6.0 Model 6041X

6.1

is

the erase

of

specified in

4.2.

5.4.1 is superseded by 6.2.1.

head

(K

mounting

L) ref.

and

visible above

be

position

screws

the erase

Paragtaph 4.2.1

aligned

fig. 3.1.

the upper

for

core

of

(K).

plate for the heads.

head is

paragraph 5.0

the

the erase

The erase head should

not critical.

paragraph

is superseded by

by

Approx.

tape.

head

are

height

the

0'25

track of

by

valid for

5.2 which

the

be

The

-

Fig. 6.1

-

Too

high

Correct

Track measurement

Too high

: :

of record

head

Too

low

tn

low

Record Head

6.1.1

Record a 1.000 optimum

3 for approx. 5 seconds.

Hz signal

recording

level in stereo

from

Turn

generator

a

the

on tracks 1 and

A-test

tape around and

well

above

make

Fig. 6.2

Correct

Track measurement

of erase

tro

head