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.

TANDBERG 6000X Series User manual

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