Tandberg Tcd 340 a User manual

ARARBSBEER

ee

——

~

TCD

340A

Circuit

Diagrams

with

Alignment

Instructions

Mechanical

adjustments,

see

Service

Manual

for

TCD

330,

Ordering

No.

714021

‘Right

Channel

Electrical

adjustments

for

the

Tep

340A.

eee

General

Before

adjusting,

the

tape

path

must

be-cleaned

and

demagnetized.

It

is

necessary

that

the

tape

path

is

correctly

adjusted,

consult

the

service

manual

for

the

TCD

330,

part

No.

714021...

Carry

out

the

adjustments

in

the

order

described

because

the

adjustments

affect

each

other.

Remove

the

top

panel,

base

panel,

and

right

side

panel.

©

Equipment

required

—

2

volt

meters

—

Audio

signal

generator

—

Frequency

counter

—

Distortion

meter

~—

Wow

and

flutter

meter

—

Tandberg

test

cassettes

—

No.

21

(Speed

check,

1000

Hz)

—

No.

22

(Wow

and

flutter

check,

3150

Hz)

—

No.

23

(Azimuth

adj.

playb.

head,

6300

Hz)

—

No.

24

(Playback

level

adj.,

1000

Hz)

—

Measuring

cassettes

—

Maxell

UD

XLI

(Type

I)

~

Maxell

UD

XL

II

(Type

II)

Before

adjusting,

set

the

buttons

to:

—

MPX-FILTER

(situated

at

the

back

of

the

deck)

to

OFF.

—

Dolby

NR*

to

Off.

—

Tape

to

Type

I.

~—

Output

Level

controls

to

max.

*

The

word

“Dolby”

is

registered

trade

mark

of

Dolby

Laboratories

Inc.,

USA.

NR

stands

for

Noise

Reduction.

Figure

1

Oscillator

The

oscillator

frequency

is

between

80

and

100

kHz.

The

voltage

measured

on

the

erase

head

should

be.

between

25

and

32

volts.

Sensitivity

adjustment

—

Set

the

Monitor

button

to

Source

position,

and

Input

and

Output

Level

controls

to

maximum.

—

Apply

8mV,1000

Hz

to

the

RADIO

socket

(DIN)

or

80

mV,1000

Hz

to

the

INPUT

sockets

(Phono)

from

the

audio

signal

generator.

—

Adjust

the

SENSITIVITY

ADJ.

pots.

R101-R201

to

obtain

775

mV

measured

on

a

voltmeter

con-

nected

to

the

Dolby

encoder

output,

see

Figure

1.

—

Move

the

measure

probe

to

the

Dolby

decoder

output,

see

Figure

2.

—

Adjust

the

SOURCE

LEVEL

ADJ.

pots.

R118-

R218

to

obtain

775

mV.

—

Check

the

frequency

response

in

Source.

Dolby

encoder

output

Right

channel

meas.point

Left

channel

meas.point

Gace

SS

esate

PLAYS.

TREBLE

ADJ.

Ri207R

=

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ee

R21

1

aR

RIEL

ernz19R

|

ORIOL

PLAYS.

LEVEL

PLAYB.

METER

@

R223

AZIMUTH

METER

ADJ.

.

{

r28R

I

rose,

R213R

1

Rec.

cever.

thre

s

TAPE

REC.

METER

4.

2

RUSE

e

R2BR

ORTBL

A209R@®

09

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Al

SOURCE

LEVEL

REC.LEVEL

ADS.

TYPE

11

TAPE

R201

8

RIOTL

e

SENSITIVITY

ADJ.

MIC,

LINE

AMP.

OUTPUT

TRIMMING

POTS

ON

MAIN

BOARD

SEEN

FROM

SOLDER

SIDE

Trimming

pots.

and

Dolby

encoder

measurement

points

ay

C

(

Dolby

decoder

output,

Right

channel

meas.

point

Or

measure

on

R1403

Left

channel

meas.

point

Or

measure

on

R1303

oR

ao.

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FE

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Playback,

azimuth

Playback,

height

Record,

azimuth

Record,

height

Figure

3

Adjustments

for

the

heads

Azimuth

adjustment,

playback

head

—

Insert

a

Tandberg

test

cassette

No.

23

ora

standard

azimuth

cassette.

—

Set

the

Monitor

button

to

Tape

and

connect

a

voltmeter

to

each

channel

of

the

OUTPUT

sockets.

—

Press

the

Play

button.

Adjust

the

playback

azimuth

screws

shown

in

Figure

3

to

obtain

maximum

reading

on

each

channel.

Playback

level

-

—

Insert

test

cassette

No.

24.

—

Connect

a

voltmeter

to

each

channel

of

the

Dolby

decoder

output

shown

in

Figure

2.

—

Adjust

the

PLAYBACK

LEVEL

pots.

R119

and

R219

until

you

read

775

mV

on

each

channel.

Level

meter

adjustment,

playback

—

Insert

Tandberg

test

cassette

No.

24.

When

the

playback

level

is

correct,

adjust

the

level

meter

to

0

dB

with

PLAYBACK

METER

R114

and

R214.

Azimuth

and

height,

record

head

.

—

Use

Maxell

UD

XL

I

or

an

equivalent

tape.

—

Apply

1000

Hz

to

the

INPUT

sockets

both

channels.

—

Set

the

Monitor

button

to

Tape

and

connect

a

voltmeter

to

the

OUTPUT

sockets

both

channels.

—

Press

the

Record

button

and

turn

the

two

record

head

height

screws

shown

in

Figure

3

by

équal

amounts

(the

same

number

of

degrees)

to

obtain

the

maximum

reading

on

both

channels

of

the

OUTPUT

sockets,

or

the

best

compromise.

—

Adjust

the

azimuth

(10

kHz)

and

the

height

_

alternatively,

until

the

head

sits

correctly..

.

—

Azimuth

can

also

be

adjusted

with

the

built-in

control

oscillator

(10

kHz).

NOTE!

The

record

height

screws

must

be

adjusted

by

equal

amounts

to

ensure

that

the

head

paral-

lelism

does

not

change.

Overall

frequency

response

with

Type

|

Tape

(bias)

—

Set

the

Monitor

button

to

Tape.

—

Apply

1000

Hz

from

the

signal

generator

to

one

of

the

inputs.

—

Reduce

the

level

at

the

signal

generator

by

35

dB

or

reduce

the

level

by

a

similar

amount

on

the

Input

Level

controls.

—

Press

the

Record

button,

and

adjust

the

BIAS

ADJ.

TYPEI

TAPE,

C1502

and

C1602

to

obtain

maximum

reading

at

the

outputs.

—

Sweep

the

audio

generator

through

the

full

fre-

quency

range

and

check

that

the

response

curve

is

correct.

—

If

necessary,

adjust

the

curve

with

C1502

and

C1602

to

obtain

the

correct

response,

+

3

dB,

30

to

18000

Hz.

C1602

BIAS

ADJ.

TYPE!

TAPE

R

1502

BIAS

ADJ.

TYPE}

TAPE

1

A108

BIAS

ADJ.

TYPE

1!

TAPE

&-R

Fig.4

Bias

adjustments

Adjusting

the

record

current

(Source/Tape)

Type

|

Tape

—

Use

the

same

input

level

as

for the

bias

adjust-

ment

(—

35

dB)

and

1000

Hz.

—

Adjust

the

record

current

by

means

of

the

REC.

LEVEL

ADJ.

pots.

R108

and

R208

to

obtain

the

same

output

level

for

both

positions

on

the

Monitor

button.

—

Then

depress

the

Dolby

NR

button

and

check

the

overall

frequency

response.

Overall

frequency

response

with

Type

||

Tape

(bias)

—

Use

the

same

procedure

as

for

the

Type

I

tape.

—

Insert

a

Maxell

UD

XL

II

or

an

equivalent

tape.

—

Set

the

Tape

button

to

Type

II

position,

and

press

the

Record

button.

—

Check

the

frequency

response,

and

if

necessary,

adjust

the

BIAS

ADJ.

TYPE

II

TAPE,

pot.

R1508

to

obtain

the

correct

response.

Adjusting

the

record

current

(Source/Tape)

Type

Il

Tape

—

Use

the

same

input

level

as

for

the

bias

adjust-

ment

(—

35

dB)

and

1000

Hz.

—

Adjust

the

record

current

by

means

of

the

REC.

LEVEL

ADJ.

pots

R109

and

R209

to

obtain

the

same

output

level

for

both

positions

on

the

Monitor

button.

R1101

and

R1201

affect

the

treble

response

in

the

frequency

region

15—18

kHz

on

the

playback

curve

for

all

types

of

tapes.

2

Level

meters

adjustment,

record

—

Set

the

Monitor

button

to

Tape.

—

Apply

1000

Hz

to

the

INPUT

sockets

(both

channels).

—

Press

the

Record

button

and

adjust

the

Input

Level

controls

for

1.5

volt

reading

on

the

OUTPUT

sockets.

—

Adjust

the

REC.

METER

pots.

R113

and

R213

to

obtain

0

dB

on

the

level

meters.

Distortion

Record

1000

Hz

at

0

dB

deflection

on

the

meters.

The

max.

distortion

for

record/playback

is

3%.

Erase

test

Connect

a

microphone

to

the

TCD

340A

and

record

an

overload

signal.

Record

again

to

erase

the

overload

recording

and

play

back

to

ensure

that

the

overload

signal

cannot

be

heard.

Azimuth

meter

adjustment

—

Set

the

built-in

oscillator

to

ON.

—

Set the

Output

Level

controls

to

maximum.

—

Insert

a

Type

I

tape

and

press

the

Record

button.

—

Adjust

R223

(AZIMUTH

METER

ADJ.)

to

approximately

—

3

dB

deflection

on

the

right

meter.

—

Check

also

that

the

meter

deflection

with

a

Type

II

tape

is

within

the

meter

scale.

Speed

check

Play

back

Tandberg

test

cassette

No.

21

(speed

check

1000

Hz)

and

measure

with

a

frequency

counter

on

the

OUTPUT

sockets:

<+

0.5%

(995

to

1005

Hz).

Wow

and

flutter

Play

back

a

Tandberg

test

cassette

No.

22

(3150

Hz)

and

measure

with

a

wow

and

flutter

meter

on

the

OUTPUT

sockets:

Weighted

RMS:

<

0.09%

Weighted

Peak

DIN

45511:

<

0.2%

Record/playback

Record

from

a

generator

3150

Hz

(check

with

a

frequency

counter

and

measure

with

the

wow

and

flutter

meter

on

the

OUTPUT

sockets.

Weighted

RMS:

<

0.12%

(Se

ae

ea

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A

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1-4)

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ENCODER

TANDBERG TCD 340 A User manual

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