Tandberg 3500-XD Service manual

IffiEffi

SoooxD

SERVICE

MANUAL

CONTENTS

l. l.l

r.2

,

2.1

99

3.

3.1

3.2

3.3

3.4

c.c

3.6

4.

4.1

4.2

4.3

4.4

4.5

5.

5.1

5.2

5.3

5.4

c.5

6.

6.1

6.2

6.3

6.4

6.5

7.

7.1

19

7.3

8.

8.1

8.2

8.3

8.4

9.

9.1

9.2

10.

11.

11.1

rt.2

11.3

Introduction....

General Removingthe toppanel

Maintenance....

Cleaningthetapepath.. Lubrication

Mechanicalchecksandadjustments.. Checking Adjustingthetake-upforce. Adjustingthe windingforce. Adjustingthebrakes

Rubberdrivebelt .......8

Pressurepadarm ...9 Tapepath

Capstan Headparallelism. Tape guide posts

Pinchroller .......11

Flutterroller. Head

Playbackhead. ....13

Recordhead. .....13

Height Biashead Erasehead

Head Playbackhead. Recordhead. Biashead Erasehead. Aligning the hum shield for the

Headalignment,two Playbackhead. Recordhead. Erasehead

Circuits Oscillator. Photoend-stop

Record Faultinthetotalresponse

Modifications...

Changingthelinevoltageand Changing from four tracks

Blockdiagrams

Electricaladjustments....

Outputamplifiers

Dolby*leveladjustments

Adjustments,allmodels....

Circuitdiagrams

the

take-up

and

alignment

adjustmentby

alignment

and

with

without Tandberg test

playback frequency

..,....3

.

force

and winding

guide

screws.

Tandberg

trackmeasurement... ......13

tracks .....16

(3400X)

test

playback

responses

curve,one channel.....

frequency...

to two tracks version

(3600XD).

force. . . . .

.. ..

tapes,

four

tapes,

head

tracks

four

tracks

. . . . .15

....

......3

...,.,.4

.......4

.......5

.......10

. . .

.......15

........17

........I7

......19

.......20

.......22

from page24

Page

....3

. 5

....5

...6

.....8

...10

.....10

.. . . .11

.....12

. . . .

.13

....I4

...I4

. . .

.15

....15

.....15

....15

...16

.....16

.....77

. . .I7 . . .18

. . .

.20

....20

.....22

...23

-----.....-

-

t

*

The

word Dolby

is a

Mark of Dolby Laboratories Inc.,

Trade

a

USA

1.

-

INTRODUCTION

1.1

Only used tape

To check

l. Remove

-

2.

When

bottom panel must The

after adjustment. until it is

To make the oxide be obtained from

GENERAL

LH

(Low

Noise/High Output) tape

for

recording. Make

path

are clean.

heads:

the

front head

the

spring loaded

cover

the Remove

on its rear

tape path must

tape

straight upwards.

the back cover

side and lifting

electrical

about 3 feet from magnetized parts

in "Magna

powder

and alcohol. Iron

sure that

cover by depressing

buttons at both ends and

by depressing

adjustments are

removed.

be

be degaussed

not

Do

our service

switch

the tape

of the

See". This is a mixture

the heads and

straight upwards.

to be made, the

both

before and

off the

path.

tape visible,

powder

oxide

department.

should

the spring

degausser

the

lifting

dip

of

iron

can

be

1.2 REMOVING THE

Remove knob. Then remove

1.1. necessary and

the head covers and

the

Removal of the top

for

checking and adjustment of

parts

other

in the drive mechanism.

screws

panel

PANEL

TOP

speed selector

the

as

will usually

shown in

Figure

be

only

clutches

A

.HHs..[n

NOTE! Model Model Model

-

All paragraphs 3400X, from 3500X,

3600XD,

all

from

decks

in

this

serial No.

manual are

4300 000

4200

000

valid

for:

Fi4.1.1.

Top panel

screu)s

2.

MAINTENANCE

2.1 CLEANING It is important

adjustments have

been

magnetized.

Cleaning

(Q-tips) moistened with

sticks

methylated spirit. A

"Tandberg also available.

that the tape

are made. If

adjusted,

should be carried

Professional Tape

ffi

TAPE

THE

the

the tape

out with cotton-bud

special

2.1

Fig.

PATH

path is clean before

heads

and guide

path must be

pure

alcohol

cleaning

Head

kit

Cleaner"

posts

de-

or

called

is

--=

o

Cleaning

taPe

the

The runs unevenly the even that

2.2

Path

pinch roller

(4

roller

if

the tape

pinch

the

LUBRICATION

A should

if

or

6 times

to

recorder

roller

be cleaned

there are

year should

a

much used).

is

after

dry

if the tape

visible deposits

be sufficient,

Make sure

cleaning.

on

Aerosol may be used, the

Obstinate well removed

sprays

parts; cotton-bud sticks

softened

indented for

but it is not

deposits on

with the cleaning

with the aid of a

video tape recorders

sufficient

must also

guide

toothpick.

posts

just

should be

agent

to

be

and

spray

used.

first

then

NOTEI each bearing, the drive

The

mounted

need

some use

The motor should

3000 Teresso

Do not usc

as excessive

mechanism

turntables,

attention under

reason lubrication

Teresso

hours of

oil No.

flywheel and transfer

in selflubricating

No

oil

operation.

43 or

more than one

may penetrate

oil

and

disturb

normal conditions.

appears to

43

47 from Esso.

or

lubricated after

be

Apply

47 from Esso.

friction

bearings

only

drop of oil

wheel

and should not

necessary,

be

every one

on

into

conditions.

are

If for

drop

of

t

3.

A

MECHANICAL

CHECKS

ADJUSTMENTS

AND

3.1

CHECKING WINDING

THE

FORCE

O

TAKE-UP

FORCE

AND

3.2

ADJUSTING

THE

TAKE-UP

FORCE

Fig.

3.1

Checking

A 7"

reel

with a hole

hub

hole

is required

Insert

the leg

hole.

The

in the

direction

measurements

fied

values.

Turntable

Rieht Right >> Left

Table

3.2

x

is

It

normal

]

20-30% operation

of the

reel

see

Operating

position

Clutch

after

for

the winding

drilled

together

torque

should

are performed

for

be

allowed

of the clutch

table 3.2.

lever

torque

the

winding force

the machine

some time.

force.

in it

80 mm

with

gauge

to rotate torque to obtain

Playback wind force

25-

9o-2so

90-250

has

been

from

a torque

into

the

while the

the

or

30

e*

g*

p*

to

increase

in conrinuous

the

gauge. drilled slowly

speci-

Fig.

3.3 Adjusting

NOTE ! belt

The forward vides behind

Adjust Figure

If the

adjusted

Do

not touche

with your fingers. rubber

drive.

the

take-up

the take-up

the

take-up force

3.3.

winding force

explained

as

drive

This

the take-up

the

textile

belt

does not move

is

because

force

via

a drive

turntable.

by moving

is not

correct

on the next page.

force.

side of the

during

a textile

wheel

the

it should

normal

belt pro-

mounted

spring, see

be

3.3 ADJUSTING

THE

WINDING FORCE

!

f-x

&t

..d5"

tl

U,

Fig,

3.4 Checking

Adjusting the

The

winding force is

See

Figures 3.5 and 3.7.If the tension and the springs do mined by the

clutch leaver. If the

adjusting With

on

the

as

shown in Figure 3.4. The play table turntable spindle. The can be adjusted

NOTE! must glued

not change, the

the play,

joystick

the

turntable should

can be adjusted

If the

unscrewed

be

into

position after the

turntables.

reel

determined

play

on the

tension

replace

in

by turning the

turntable pulley (right turntable)

FREE

the

be between 0.5

by turning the nut

play on

from

the

by the

winding

reel

is

the

turntable

play

force

turntable and the

not correct after

still

spring

position,

the

turntable pulley.

A.

on the left

right

has

been adjusted.

springs

deter-

is

play

the

1 mm

and

turn-

on the

turntable

it

should be

A.

the

play

on

the

turntables

!

[-r

vd

A\

//\L\\

lV

\ *.-<^t ,/

-'-AE-/

A

W

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\\ - \i)+Z- //

-:

6

w

"

-

nWZ

d

A.t?

d\?=

,^

EH

-€ R

\vl

a-l

==-'*\

@9':'

€

a

)

\\

Fig.

fil

3.5

The

supply turntable

-

Adjusting With

position, left, To

adjust

Figure

When levers be

correct. Check table page.

the clutch

joystick

the

play

the

should be between

this

3.6. play

the has

been adjusted,

page

on

Fig.

3.6

Checking the

lever.

NEUTRAL (middle)

in the

on the clutch

0.5 and 1 mm.

play,

turn

the

on

the turntable and the clutch

the winding forces

forces

these

5. Adjusting

levers, right and

screws

the brakes -

B

with

the aid of the

shown

in

will

play

on the

clutch leaers

A

K

d

^W

^r7?

d\F

4

A

(ffi)

-S:._LZ,/

B

a

w

-t^]-

EE

€

€e\

A)

Fig.

3.7 The take-up

turntable

3.4 ADJUSTING THE

BRAKES

This

adjustment turntables, but referende is table.

See

joystick

the

Set

the

(0.4")

joystick

between the

clearance.

clearance is I mm Set check the

procedure

Figure 3.8.

the ) position.

to

approx.

(

to

brake

If necessary

alternatively

,

the same for

is

to

made

Check

pad and

adjust screw

the

D

both

right

turn-

that

turntable

and

the

D.

Fig.3.8. ,ldjustirtg

the brakes on

the

right

tunttable

<\

3.5 RUBBER DRIVE

The rubber mode. This

the

take-up force

behind the

When

changing the

new

belt sits correctly shown two

Thebelt

pulley.

in

belt

grooves

must

Figure 3.9.

belt does

drive is because a textile belt

via

a drive rvheel mounted

take-up turntable.

belt, make

drive

on the

The

and not

not

cross on the wrons side

BELT

move

not

motor pulley

must

belt in

same groove.

the

PLAY

in

provides

sure that

in

sit

the

as

top

of the

\s

Fig.

3.9 Replacing

=it

the driue

$

belt

T

.A\

The lifting arms adjusted position). pliers the B.

;\

when the

as shown in

for

the drive

joystick

Adjust for I mm clearance with flat

Figure

belt should be

is in NEUTRAL

3.10. Adjust A

first

(nrid-

and

Fi9.3.10.

Adjusting the

clearance on

driue belt

the

a

3.6

With from should should Adjust by pressure pressure bracket.

PRESSURE

the

be be measured

PAD ARM

joystick

pressure

between 80 and

bending spring A

pad

arm

pad

arm

the ) position,

in

pad arm

shown

as

against the

parallel

is

the

tension against the bracket 100

g. This pressure

in Figure

which

head.

when it meets

3.11.

presses

Check that

the the

the

Fig.3.

1. lvleasuring

1

pressure-pressure

the

4.

TAPE

PATH

4N

4.1

Before the Useipecial

three upper dois adjusting.

coioured

three

the touching

NOTE! with

CAPSTAN

the

position

legs of the

mounting

not

legs of

screws

The capstan

normal

heads

of

tool

on the

rest

adjust

To

screws

the

and

the

Plate.

use

and tape

capstan

the

No.

5 special plate.

plate' the

the

adjust

and tool

check

will

and

guide

must

as shown

tool

If one

capstan,

the

on

rest

that

again

not

transit.

posts are

be checked.

Figure

in

should

the

go

rest

more

or

capstan

loosen

capstan

plate. Tighten

legs

the

out of

adjusted,

4.1. All the

on

legs

the

of

needs

three

the

all

until

are all

adjustment

up

Fig. 4.1.

Actjusting

capstan

the

with special

tool

No'

1

5'

4.2

Check tape aflects path, ilignment see

HEAD

that the

path

the

and where

Forwards

PARALLELISM

heads

gauge'

page.

see Figure

passage

the

complete

the

of

parallel

are

the tape

are seriously

heads

tape

Adjust

Backwards

with

This adjustment

4'2.

through

must

path

of

aid

the

tape

the

of

out

checked,

be

r-TIl

L__J

Correct

Zenith

s

a

path gauge'

tape

the

Fig. 4.2.

Adjustirtg

with

(s'

4.3

a

TAPE

GUIDE

SCREWS

POSTS

AND

GUTDE

Fig.

4.3.

Adjustable

tape

guide

posts.

;\

Thread slowly tape

by

a tape

down

rotating

into

the

)

the left

tape path.

position

reel

pull

and

slowly

joustick

the

tishten

cloikwise.

the

Check with adjust

When

tape top under

4.4

The are parallelism

Parallelism.

Push pinch loosen until

Tighten

that

the

edges

the guide

the

machine

is passing

edges

of

no

circumstances

PINCH

two

adjustments

the pressure

roller

is parallel

screw

the

pinch

up

screw

tape

of the

screws

is

the

heads,

the

guide

ROLLER

and

azimuth.

roller

A

and

roller

A.

does

not

tape

guide

shown

in

the playback

the

posts

should

possible

arm

with the

adjust

and

screw

capstan

come

screws.

in Figure

tape

guide

and

it

on the

in

and

capstan.

B

are parallel.

into

mode

may

twist

pinch

check

(Figure

contact If

necessarv,

4.3.

and

touch

screws,

or

distort.

roller

that

To

adjust,

4.4)

the

but

the

Azimuth.

Put

a tape

to

)

it

has

screw

A

tape

.

Check

passed

A

and

runs

properly.

into

the

that

the pinch

move

tape

path

the

tape

rbller.

bracket

Tighten

and

move

does not

To

adjust, loosen

(Figure

C

up

screw

the

distort

4.4) A.

joystick

when

until

the

Fig.

4.4.

Adjusting

the

pinch

roller.

4.5 FLUTTER

Parallelism.

ROLLER

Loosen

into the slot and move

or

screw A

backwards

(Figure

the upper

until

the flutter roller

4.5).

Insert

bearing forwards

the head front.

Azimuth. Set the speed selector

the tape

path,

and move

to 7Vz ips,

the

put

joystick

a screwdriver as shown in Figure 4.6 to move

just

the flutter roller to the left until

touches the top edge

of the

nearest

post.

a screwdriver

parallel

is

with

a tape into

to ) . Insert

and twist it

the tape

tape guide

Fig. 4.5. Adjusting the

parallelisem

of the

flutter

roller.

Move

the screwdriver

Figure to the tape will

of the tape guide

of the tape

This adjustment can be checked with

behind the tape

light

tape

4.7

and move the flutter roller carefully

right.

If the

lift

slowly upwards

guide post

between the tape and the

guide post.

to the position shown in

roller is correctly adjusted the

from the bottom part

post

and touch the upper

curling.

from

the

lower part of the

path.

without

Look

part

a lamp placed front

to

see

Fig.

4.6. Adjusting

Fig.

4.7. Adjusting the

the azimuth of

,----l

17/

azimuth

of

the

flutter

roller.

(R

($

roller.

I

t;

5.

HEAD

TANDBERG

FOUR

ALIGNMENT WITH

TEST TAPES,

TRACK

J^-

"Qf

NOTE!

l--r

t

Height

Lateral Alignment

v

Azimuth Zenith

HEIGHT

MEASUREMENT

stereo

dire

a solution of

and alcohol (Magna

visible as four

be

sholvs

21) patterns

the

high

or too

of the

patters

the

adjustment

the

dcck

LEVEL

reading on a.c. voltmeters connected

LINE

OUT sockets. Adjust the screw

or the best compromise.

ADJUSTMENT BY TRACK

a 1,000 Hz

one direction, then in

ction.

Cut off a length of

fine-grained

the

correct

obtained when the head

low. If necessary,

head

and repeat

are correct.

rvith a new tape and record 13 kHz

to

buttons to TAPE.

potentiometers for

siqnal lvell above

See).

dark

stripes.

pattern

the

signal in

stereo.

output

iron-oxide

The

adjust the measurement

Figure

on the

Adjust

approximately

from

(

the

tape and

tracks

Set

both

10.2 tape

is

at the both

D

will

either

the

to

^

a\

The

tape path adjustments defects. adjustment

Seal

all screws ments have

After replacement of a it may

only. a complete path carried this

often

If, however,

must

out in

section.

5.1 PLAYBACK

Connect OUT

sockets and set the

to TAPE.

Height

Play recorded and by approximately 35

pla,vback

page

track 3,

parallel

Azimuth adjustments

Play

a standard

tion of

Figure the adjust

adjustments

back test tape

with the area

2l

to the tapc.

back

the

10.1 (page

voltmeters

for

must be thoroughlv cleaned

are carried out. Use tape without any

If

the heads have grooves

of

been

check

be

heads

the

the tape path

in

made.

single

necessary to adjust the new part

be

more parts

and

adjustment

performed.

same sequence

the

HEAD

an a.c. voltmeter

No. 1. This is

tape

head until minimum channel R while maintaining the head-front

Tandberg test tape No. 2 at 7tl: ips

azimuth

playback head

the best compromise.

1,000 Hz recorded

with

corresponding

dB. Adjust the

means

by

tape).

until maximum

2l)

is obtained on both

5.2 RECORD HEAD

before

caused by wear,

should

Adjustments

to

SOURCE/TAPE buttons

of scrcw A,

outplrt is

Adjr,rst

by means of screw B,

avoided.

be

after the adjust-

part

in the tape path,

have to be adjusted,

the entire

of

must

be

explained

as

each

of the LINE

full

track pre-

a

at 7/z ips

track 3 reduced

to

height

obtained

the

channels,

of the

Figr-rre

azimuth posi-

10.1,

from

output on

or

in

(or

tape

5.3

Record in normal level, first in opposite dip into powder then (page and too height until

Azimuth Load

33/a, tps a 12 SOURCE/TAPE INPUT 150 mV the (figure 10.1) for maximum channels,

Height

Insert a new forward appears to run parallel the

(0.04") height with taining

^

l

adjustment

drive (

record

head,

see Figure 5.1. If

scrervs C, Figure

the head-front parallel

by visual inspection

tape and set the

Check visually

)

).

n,ithin

deck to

with the upper track

approximately 0.1

necessary adjust

10.1, with the

normal

that the tape

main-

rvhile

tape.

mm

the

on

Fig.

5.1.

-

Four

track record

Approx.0.1 pole

piece

tape.

head.

mm

visible

of upper above

t'Et