Tandberg TCD-340-A Service manual

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TANDBERG

TCD

34OA-

Circuit

A

Mechanical

gnrn

li

adjustments,

DagraTs

en

see

tTn

Service

Manual

st

r

u

for

TCD

wrth

cti

330,

o

n

Ordering

s

No.

714021

Electrical

adjustments

for

the

TCD

3404

General Before

adjusting,

tape path must be cleaned

the and demagnetized. It is path is manual

Carry

correctly adjusted, consult the service

for

out

TCD

the

adjustments

the

330, part

because the adjustments the top

Equipment

-

panel, base

panel,

required

volt

2

meters Audio Frequency

signal

counter

generator

Distortion meter

Wow Tandberg

-

No.

- No.

-

No.

-

No.

flutter

and

meter

test cassettes (Speed check, 1000 Hz)

21

(Wow

22 23 24

and (Azimuth (Playback

Measuring cassettes

-

Maxell Maxell

-

UD UD

I (Type I)

XL

Il

XL

flutter

adj. playb. head, 6300 Hz)

level

(Type

necessary

No.

order described

in the

affect

each other.

right side

and

check, 3150 Hz)

adj., 1000 Hz)

II)

that the tape

714021.

Remove

panel.

Oscillator The

oscillator

The

voltage

between

Sensitivity

- Set

the Monitor

Input and Output Level

-

Apply

80

or from

-

Adjust the

obtain 77 5 mY measured on a voltme

to nected

Figure

see Move

output,

- Adjust

R218

-

Check the

frequency

is

between

measured on the erase

and 32 volts.

25

adiustment

button to Source position,

controls

8mV,1000

mV,l000

Hz

Hz to the INPUT sockets

the audio signal

to the

generator.

RADIO socket

SENSITIVITY ADJ. pots. Rl01-R201

to the

Dolby

encoder output,

1.

measure

the

Figure

see

SOURCE

the

to obtain 7 7 5

probe

to the

2. LEVEL ADJ. pots.

mV

.

frequency response in

80 and

head should

100

kHz.

be

and

maximum.

to

(DIN)

(Phono)

con-

ter

Dolby decoder

Rl18-

Source.

Before adjusting,

MPX-FILTER (situated

OFF.

to

-

Dolby

-

Tape to

-

Output Level

*

The word

of Dolby

NR stands

NR*

Type

"Dolby" is registered trade marh

Laboratories

for

the

set

to Off.

I. controls to

l'{oise Reduction.

buttons

to:

at the back of the deck)

max.

USA.

Inc.,

Dolby

Right channel meas.point

RroBP I Prosr.

L

| I RTL LLvtL

J-

- - -l

R2oq Ra

REc LEV€L aoJ TYPE

_

.:.,

P)lI P

REc METER

R2rg R RrrB

aori*aa a?ura

encoder output

T'Pf

I TAPI

agrog

!

tl TAPE

Left channel

meas.point

Figure

1 Trimming

TRIMMING

pots.

POIS

MAIN AOARD SE€N FAOM SOLOER

ON

and Dolby

SIDE

encoder rneasurement

points

Left channel

Or measure

Dolby decoder outpul

point

meas,

on 81303

Right

channel meas.

Or measure on

R1403

point

Azimuth

-

Use Maxell UD XL I or an

and

height,

record head

equivalent

tape.

-

Applf'

channels.

-

Set the

voltmeter to the OUTPUT sockets both

Figure

..

^O

2 Dolby

decoder measurern,ent points

Playback, azimuth

Playback, height Record,

azimuth

o^v^

^Va

.J n.': \

-v/-

o<-o

i^

Figure

3 Adjustments

Azimuth adjustment,

Record, height

the heads

for

playback

head

channels.

-

Press

the head height amounts the maximum reading OUTPUT

-

Adjust the azimuth (10 alternatively,

-

Azimuth control oscillator

NOTE! The by

equal amounts

lelism does

Overall

frequency response with Type

Hz

1000

Monitor

Record

screws shown

(the

sockets, or

can also be adjusted

record height screws

not change.

the INPUT

to

button to Tape and connect

button

same number of

on

the best compromise.

until the head sits correctly.

(10 kHz).

ensure

to

sockcts

and

turn the two record Figure

in

degrees) to obtain

both

channels

kHz)

and the

with

must be adjusted

that the

both

3 by equal

of the

height

built-in

the

head paral-

I Tape

(bias)

a

Insert a Tandberg

standard azimuth

- Set the

Monitor button

voltmeter to

test cassette

cassette.

each

channel of

to

No.

Tape

and connect a

the OUTPUT

23

sockets. Press

azimuth screws

the

Play

button.

shown in

Adjust the playback

Figure

3

to

maximum reading on each channel.

Playback

- Insert Connect

Dolby

level

test cassette

No.

a voltmeter to

decoder output

24. each

shown

channel in Figure

- Adjust the PLAYBACK LEVEL pots. until

you

read 775 mV

playback

R219

Level meter adjustment,

-

Insert Tandberg test cassette No.

on

each

24.

or a

obtain

of

the

2.

Rl19

and

channel.

-

Set the

- Apply of the

- Re duce the or reduce Input Level controls.

- Press ADJ. TYPE I TAPE, C1502 and Cl602 to maximum reading at the

- Sweep the audio quency is correct.

- If necessary, C1602

30 to 18000

Monitor button to

1000 Hz

inputs.

the

range

to

-'.\

from

level at the signal

level

the

Record button, and adjust

obtain

by a similar

generator

and check

adjust

the correct

Hz.

Tape.

signal generator to one

the

generator by 35 dB

amount on the

outputs.

throush the

that

the curve with C1502 and

response

the

response,

the BIAS

obtain

full fre-

curve

t

dB,

3

When the playback meter to 0

dB with

and R214.

level is

correct, adjust the

PLAYBACK

METER Rl14

level

Bias adjustments

^

Adjusting Type

- Use ment

- Adjust REC. LEVEL obtain the on

Then depress

the

Overall

-

Use

-

Insert a Maxell UD

- Set the

press

-

check adjust the Rl

the record

I Tape

same input

the

(- 35 dB)

the record current

same output

Monitor

the

overall

the

508

frequency response.

frequency response

same

Tape button

Record

the

the frequency response, and if

BIAS ADJ. TYPE II TAPE, pot.

to obtain the correct

current

level as

and

ADJ. pots. Rl08

butron.

the Dolby

procedure as

XL

button.

(Source/Tape)

for

1000 Hz.

by

level

NR

button and check

with Type ll Tape

for

II or an

Type

to

bias adjust-

the

means for both

response.

of

the

R208

and

positions

Type I

the

cquivalent tape.

position,

II

necessary,

to

(bias)

tape.

and

Distortion Record 1000

The max. distortion for

Erase

test

Connect a microphone record an overload the overload signal cannot be

imuth

Az

-

the

Set

-

Set the Output

- Insert

-

Adjust ff.or:"r:t-"tely

_

Check also that the meter Type II

Hz

at 0 dB

overload signal. Record again

recording

meter

adjustment

oscillator Level

(AZIMUTH METER

-

within

built-in

aType I tape and

p.Z2Z

tape is

deflection on record/playback

to the TCD 3404 and

and play

controls

press

3

dB deflection on the right

the meter

back to

heard.

ON.

to

maximum.

to

the

deflection

scale.

the meters.

is 3%.

erase

to

ensure

Record

button.

ADJ.)

with a

I

\

the

that

c

/

to

Adjusting the Type ll Tape

- Use the ment

-

Adjust the record current by means of LEVEL ADJ. pots same output Monitor

R1101 and

frequency region 15-18 kHz on the playback

the curve forall types of

Level

meters

-

Set the Monitor button to Tape'

-

Apply channels)'

Press

Level OL-rTPI-IT

record current

same input

(-

dB)

35

button.

R1201 affect the treble

adjustment,

1000 Hz

Record button and adjust the

the

controls

sockets.

level

and

Rl09

for

level

the INPUT

to

for 1.5 volt ,.uiing on

(Source/Tape)

as for the bias adjust-

1000IIz.

R209

and

both positions on

tapes.

record

to

response

sockets

REC.

the

obtain

the

(both

Input thi

the

in

Speed Play

check counter

<!

Wow Play

(3150 meter

weighted RMS: ( 0.09% Weighted Peak

Record/prayback

flutter weighted RMS:

check

back Tandberg

1000 Hz)

on the

(995

03%

and flutter back a Tandberg test cassette No.

Hz)

on the OUTPUT sockets:

Record frequency

from a generator 31b0 Hz

meter on the OUTPUT sockets.

and measure with a frequency

OUTPUT sockets:

1005 Hz).

to

measure with

and

DIN 45511 10.2%

.or,ni., and measure

(

0'12%

cassette

test

No.

21

a wow

and

(check

with the wow

(speed

22

flutter

with

and

I

a

- Adjust the to

obtain

0 dB

g

REC. METER pots.

the level meters.

on

Rl13 and

R213

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Tandberg TCD-340-A Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual