TANDBERG TCD 340A Alignment Instructions

TANDBERG

^

TCD

34OA-

Circuit

DagraTs

wrth

A

li

gnrn

en

tTn

st

r

u

cti

o

n

s

Mechanical

adjustments,

see

Service

Manual

for

TCD

330,

Ordering

No.

714021

Electrical

adjustments

for

the

TCD

3404

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

XL

I (Type I)

-

Maxell

UD

XL

Il

(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 marh

of Dolby

Laboratories

Inc.,

USA.

NR stands

for

l'{oise Reduction.

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

adiustment

- 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,l000

Hz to the INPUT sockets

(Phono)

from

the audio signal

generator.

-

Adjust the

SENSITIVITY ADJ. pots. Rl01-R201

to

obtain 77 5 mY measured on

a

voltme

ter

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.

Rl18-

R218

to obtain 7 7 5

mV

.

-

Check the

frequency response in

Source.

Dolby

encoder output

Right channel meas.point

Left channel

meas.point

_

|

RroBP

I

Prosr.

.:.,

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J-

- - -l

R2rg

R

RrrB

L

R2oq Ra

agrog

!

aori*aa a?ura

REc LEV€L aoJ TYPE

tl TAPE

TRIMMING

POIS

ON

MAIN AOARD SE€N FAOM SOLOER

SIDE

Figure

1 Trimming

pots.

and Dolby

encoder rneasurement

points

Figure

2 Dolby

decoder measurern,ent points

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

or a

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.

Rl19

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 Rl14

and R214.

Azimuth

and

height,

record head

-

Use Maxell UD XL

I

or an

equivalent

tape.

-

Applf'

1000

Hz

to

the INPUT

sockcts

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 equal

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

I Tape

(bias)

-

Set the

Monitor button to

Tape.

- Apply

1000 Hz

from

the

signal generator to one

of the

inputs.

- Re duce 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. TYPE

I

TAPE, C1502 and Cl602 to

obtain

maximum reading at the

outputs.

- Sweep the audio

generator

throush 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,

t

3

dB,

30 to 18000

Hz.

-'.\

Dolby decoder outpul

Left channel

meas,

point

Or measure

on 81303

Right

channel meas.

point

Or measure on

R1403

i^

..

^O

o^v^

^Va

.J n.':

\

-v/-

o<-o

^

Bias adjustments

Adjusting

the record

current

(Source/Tape)

Distortion

Type

I Tape

Record 1000

Hz

at

0

dB

deflection on

the meters.

I

- Use

the

same input

level as

for

the

bias adjust-

The max. distortion for

record/playback

is 3%.

ment

(- 35 dB)

and

1000 Hz.

- Adjust

the record current

by

means

of

the

Erase

test

REC. LEVEL

ADJ. pots. Rl08

and

R208

to

obtain the

same output

level

for both

positions

Connect a microphone

to the TCD 3404 and

\

on

the

Monitor

butron.

record an

overload signal. Record again

to

erase

the

overload

recording

and play

back to

ensure

that

-

Then depress

the Dolby

NR

button and check

the overload signal cannot be

heard.

c

the

overall

frequency response.

Az

imuth

meter

adjustment

Overall

frequency response

with Type ll Tape

(bias)

-

Set

the

built-in

oscillator

to

ON.

-

Use

the

same

procedure as

for

the

Type I

tape.

-

Set the Output

Level

controls

to

maximum.

-

Insert

a

Maxell UD

XL

II or an

cquivalent tape.

- Insert

aType I tape and

press

the

Record

button.

- Set the

Tape button

to

Type

II

position,

and

/

press

the

Record

button.

-

Adjust

p.Z2Z

(AZIMUTH METER

ADJ.)

to

-

check

the frequency response, and if

necessary,

ff.or:"r:t-"tely

-

3

dB deflection on the right

adjust the

BIAS ADJ. TYPE II TAPE, pot.

Rl

508

to obtain the correct

response.

_

Check also that the meter

deflection

with a

Type II

tape is

within

the meter

scale.

Adjusting the

record current

(Source/Tape)

Type ll Tape

Speed

check

- Use the

same input

level

as for the bias adjust-

ment

(-

35

dB)

and

1000IIz.

Play

back Tandberg

test

cassette

No.

21

(speed

check

1000 Hz)

and measure with

a

frequency

-

Adjust the record current by means of

the

REC.

counter

on the

OUTPUT sockets:

LEVEL ADJ. pots

Rl09

and

R209

to

obtain

the

<!

03%

(995

to

1005 Hz).

same output

level

for

both positions on

the

Monitor

button.

Wow

and flutter

R1101 and

R1201 affect the treble

response

in

I

the

frequency region 15-18 kHz on the playback

Play

back a Tandberg test cassette No.

22

curve forall types of

tapes.

(3150

Hz)

and

measure with

a wow

and

flutter

meter

on the OUTPUT sockets:

Level

meters

adjustment,

record

weighted RMS:

(

0.09%

Weighted Peak

DIN 45511 10.2%

-

Set the Monitor button to Tape'

Record/prayback

-

Apply

1000 Hz

to

the INPUT

sockets

(both

Record

from a generator 31b0 Hz

(check

with

a

channels)'

frequency

.or,ni., and measure

with the wow

and

flutter

meter on the OUTPUT sockets.

-

Press

the

Record button and adjust the

Input

Level

controls

for 1.5 volt ,.uiing on

thi

weighted RMS:

(

0'12%

OL-rTPI-IT

sockets.

- Adjust the

REC. METER pots.

Rl13 and

R213

to

obtain

0 dB

on

the level meters.

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1658-9

-78

Part No.714092

-

TANDBERG TCD 340A Alignment Instructions

TANDBERG TCD 340A Alignment Instructions

in altre lingue

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