Teac A-4010GSL User manual

SALES

OFFICE:

TEAC

HONGKONG

LIMITED

A-4010GSL

STEREO

TAPE

DECK

SERVICE

MANUAL

U.S.

DISTRIBUTOR:

TEAC

CORPORATION

AlERICA

TEAC

CORPORATION

;

7733

TELEGRAPH

ROAD

SHINJUKU

BUILDING

One

8-1,

NISHI-SHINJUKU,

SHINJUKU,

TOKY

S.A.

one

pee

EUROPEAN

DISTRIBUTOR:

TEAC

EUROPE

MELBOURNE

PLAZA,

QUEEN'S

ROAD

LANG

45-47,

AMSTEIDAM-W.

MAIN

OFFICE:

HONG

KONG

Ee]

PRINTED

JAPAN,

072°

005

MT4014E100

adjustments

repair

procedures

are

not

clear

seem

diffi-

cult

accomplish

should

you

desire

detailed

technical

information,

please

contact

your

nearest

TEAC

dealer,

TEAC

Corpo-

ration

affiliated

corporations

address's

which

are

printed

this

manual.

WONAMNPWN-

This

service

manual

provides

adjustment

and

alignment

procedures,

schematic

diagram

and

parts

replacement

information

and

the

prop-

procedures

for

obtaining

necessary

repair

parts.

SCOPE

TABLE

CONTENTS

GSL

FUNCT

IONAL-COMPARISON

CHART

SERVICE

DATA

TEST

EQUIPMENT

PARTIAL

DISASSEMBLY

HEADS

ALIGNMENT

-MECHANICAL-

MEASUREMENT

AND

ADJUSTMENT

-MECHANICAL

MEASUREMENT

AND

ADJUSTMENT

-ELECTRICAL-

PREVENTIVE

MAINTENANCE

TROUBLE

SHOOTING

“WARRANTY

AND

.SHIPPING

INSTRUCTIONS

EXPLODED

VIEW

AND

PARTS

LIST

PRINTED

CIRCUIT

BOARD

AND

PARTS

LIST

SCHEMATIC

DIAGRAM

MANUAL

CHANGE

SHEET

GENERAL

DESCRIPTION

The

TEAC

A-4010GSL

two

speed,

four

heads

(Forward;

erase,

record,

playback.

Reverse;

playback),

three

motors,

solenoid

operated,

quarter-track

stereo

open

reel

tape

deck

with

automatic

reversing

during

playback.

The

A-4010GSL

also

designed

for

LOW

NOISE/HIGH

OUTPUT

tapes.

The

TEAC

A-4010GSL

modernized

version

the

A-4010SL.

The

electronics

section

and

deck

mechanism

are

highly

similar

the

preceding

model.

Primary

differences

are

shown

below.

1ECHANICAL

Heads:

Tape

Width:

Tape

Speed:

Motors:

Wow

and

Flutter:

Fast

Winding

Time:

Operating

Position:

Power

Requirements:

Weight:

ELECTRICAL

Transistors:

Diodes:

Frequency

Response:

Equalization:

Minimum

Input:

SERVICE

DATA

Four

track

channel

stereophonic.

Erase,

1.8k2/100kHz,

erase

current

approx.

30mA

Record,

100Q/1kHz,

bias

current

approx.

2mA

Playback,

3kQ/1kHz

-53dB

Standard

1/4inch

tape

3-3/4ips

and

7-1/2ips

(+1.0%)

4/8-pole

dual

speed

hysteresis

synchronous

motor

for

capstan

drive.

6-pole

eddy

current

motors

for

reel

drive.

0.07%

7-1/2ips.

0.09%

3-3/4ips.

Wow

and

flutter

measured

according

weighted

NAB

standard

using

TEAC

flutter

free

tape.

Approx.

100

second

less

for

1,200

feet.

Horizontal

vertical.

100/117/200/220

100/117/200/240V

(US

Model,

117V

60Hz

only)

50/60Hz

110W

max.

20.5kg

(45.2

lbs)

2SA494(Y)

2SC971(Y)

2SC732(BL)

28C733(Y¥)

x12

$1B01-06

x12

$1B02-01

Refer

frequency

response

limit

NAB

equalization

7-1/2ips

3,180usec.

50usec.

3-3/4ips

3,180usec.

90ysec.

MIC:

Input

impedance

30k2

70dB/6002

LINE:

~18dB/100k2

Maximum

Output:

LINE:

Approx.

-2dB/10k2

HEADPHONE:

-24dB/82

Bias

Frequency:

100kHz

push-pull

oscillator

Signal

Noise

Ratio:

50dB

more,

peak

record

level

unweighted

noise

Cross

Talk

Rejection:

40dB

channel

1kHz

35dB

adjacent

track

100Hz

Erase

Efficiency:

7OdB

7-1/2ips

These

specifications

are

indispensible

information

and

are

required

service

the

equipment

properly.

They

may

differ

slightly

from

those

printed

the

advertising

brochures

the

operation

manual.

Fig.

1-1

Dimensions

TEST

EQUIPMENT

For

proper

adjustment

and

measurement,

recommended

that

the

following

test

equipment

available:

FOR

MECHANICAL

MEASUREMENT

SPRING

SCALE:

TEST

TAPE:

FLUTTER

METER:

DIGITAL

FREQ.

COUNTER:

TOOLS:

FOR

ELECTRICAL

MEASUREMENT

TEST

TAPE:

EMPTY

REEL:

TEST

SET:

BAND

PASS

FILTER:

AC/DC

VTVM:

RESISTOR:

OSCILLOSCOPE:

Use

the

TEAC

M-826A

test

set

0v4

kilo-grams

(08

1bs)

#5086025000

0v300

grams(0V10

oz)

#5086026000

TEAC

YTT-2003

(7-1/2ips)

TEAC

YTT-2002

(3-3/4ips)

Meguro

Model

MK665B

(preferred)

Sentinel

FL-3D-1

Capable

5kHz

indication

General,

2mm

nut

driver

#5086014000

Hex

head,

Allen

wrench

#5086021000

TEAC

YTT-1003

for

7-1/2ips

TEAC

YTT-1002

for

3-3/4ips

SCOTCH

203 and

150

for

recording

test

TEAC

RE~702

(2"

hub)

TEAC

RE-701

(4"

hub)

TEAC

M-826A

test

set

TEAC

M-206A

(1kHz)

General

purpose

Non

inductive

type

82/1W

General

purpose

recommended.

This

set

incorporates

LEVEL

METER,

Audio

Oscillator,

Channel

Selecting

Switch,

Variable

Attenuator,

Monitor

Speaker

and

Cables.

TEAC

M-826A

measures

the

RMS

value

the

Voltage

dB=0.775V).

Characteristics

this

test

set

are

similar

the

standard

VU-meter.

TEAC

Test

Set

(M-826A)

PARTIAL

DISASSEMBLY

TAPE

TRANSPORT

REMOVAL

(WITH

FRONT

PANEL

INSTALLED)

Lay

the

unit

face

down

soft

mat.

With

rear

cover

removed,

loosen

and

remove

three

screws

rear

sides

chassis.

Carefully

slide

transport

from

wooden

case.

AMPLIFIER

REMOVAL

Remove

four

screws

from

amplifier

front

panel.

Slide

amplifier

forward,

remove

four

screws

from

amplifier

cover,

remove

cover.

Disconnect

the

cables

connecting

the

tape

transport

and

amplifier.

NOTE:

Edge

connectors

are

held

board

two

retaining

nuts.

reinstall

the

amplifier,

reverse

the

procedure,

sure

reconnect

the

cables.

FACE

PLATE

REMOVAL

Place

the

unit

horizontal

position.

Pull

off the

pinch

roller

and

unscrew

capstan

dust

cap.

—

Remove

head

assembly

cover

after

re-

moving

mounting

screw

top

cover.

Remove

retaining

screw

left

tension

arm

and

lift

tension

arm

upward.

Loosen

and

remove

the

reel

height

ad-

justment

screw

each

reel

turntable.

Lift

off

the

reel

tables.

—

Remove

small

Phillips

screws

from

the

front

panel

each

corner,

above

and

below

each

reel

motor).

Front

panel

may

now

removed.

Reverse

the

procedure

for

reassembly.

Fig.

3-1

Unit

Disassembly

REEL

HEIGHT

ADJUSTMENT

NOTE:

Reel

height

adjustment

required

only

motor

has

been

replaced

when

the

tape

rubs

excessively

against

the

reel

flanges.

Load

unit

with

tape

(standardized

and

start

the

tape.

Adjust

turning

the

screw

the

reel

table

until

the

tape

does

not

rub

against

the

reel

flanges.

REEL

TABLE

ASSY

REPLACEMENT

Remove

reel

table

loosing

the

reel

height

adjustment

screw.

Reel

table

will

slide

off

upward.

Remove

the

two

allen

screws

lower

end

brake

drum.

Pull

out

the

brake

drum

the

direction

the

motor

shaft.

Reverse:

the

procedure

for

reassembly.

Position

the

brake

drum

from

the

edge

the

brake

band

shown.

REEL

HEIGHT

REEL

TABLE

ASSY

9339

M-O333

Fig.

3-2

Reel

Table

Assy

Replacement

CAPSTAN

MOTOR

REPLACEMENT

Slide

out

the

capstan

belt.

Loosen

the

two

set

screws

pulley

and

lift

off

pulley.

Unsolder

the

six

wires

connecting

the

capstan

motor.

Remove

four

screws

located

around

capstan

shaft

front

panel,

tak-

ing

care

that

the

motor

does

not

drop

onto

other

components.

Reinstall

reversing

above

procedure.

Adjust

capstan

belt

tension

loos-

ening

the

four

screws

the

motor,

position

motor

for

proper

belt

ten-

sion,

then

re-tighten

screws.

Apply

drop

LOCTITE

the

screws

when

adjustment

complete.

Fig.

3-3

Capstan

Motor

Wiring

TAPE

SPEED

100V

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