Amstrad Ms-45/f User manual

MIDI

SYSTE

TS46/F

TOWER

SYSTEM

SERVICE

MANUAL_

tl

CONTENTS

Technical

Specification

Safety

Test

Alignment

Instructions

Alignment

Points

Troubleshooting

Guide

Record

Oeck

&

Parts

List

Cassette

Decks

&

Parts

List

Circuit

Diagram

1646

Cabinet

&

Parts

List

Function,

Stereo

LED,

Standby

LED

P.C.B.s,

Top

&

Bottom

Views

Tuner

P.C.B.,

Top

&

Bottom

Views

Terminal

Chassis,

Deck

&

Power

Supply

P.C.B.s,

Top

&

Bottom

Views

Amp

P.C.B.,

Top

&

Bottom

Views

Rectifier

&

Bias

&

Level

LED

P.C.B.s,

Top

&

Bottom

Views

Volume

P.C.B.,

Top

&

Bottom

Views

Electrical

Parts

List

Wiring

Diagram

Chassis

Drawing

&

Parts

List

SAFETY

All

units

are

tested

to

the

following

safety

specification

during

manufacture:-

TECHNICAL

SPECIFICATION

‘

AMPLIFIER’SECTION

Power

Output

Frequency

Response

Distortion

Tone

Controls

TUNER

SECTION

FM

Band

Freq.

Range

AM

Band

Freq.

Range

FM

Sensitivity

FM

Aerial

Input

CASSETTE

SECTION

Tape

Speed

Tracks

Wow

&

Fiutter

Frequency

Response

Microphone

Sensitivity

PHONO

SECTION

Transmission

Cartridge

Type

Turntable

Control

Speed

Control

-

2.5W/Channel

@

1%

THD

:

10

Watts

Total

@

10%

THD

:

20Hz

to

20,000Hz

:

1%

@

Full

Power

:

Bass

(20-200),

Mid

(200-2k)

&

:

Treble

(2k-20k)Hz

+10dB

:

86.5

-

109MHz

:

525

-

1650kHz

:

SuV

:

75

ohms

unbalanced

:

Compact-Cassette

Type

:

4.75cm/sec

:

4

Track,

2

Channel

Stereo

:

0.2%

:

BOHZ

-

12kHz

:

0.6mV

@

600

ohms

:

Belt-Drive

:*

Ceramic

:

Manual

with

Auto-Stop

:

Electronic

DIMENSIONS

AND

WEIGHTS

MS45

Main

Unit

(mm)

Weight

Speakers

(mm)

Weight

:

360(w)

x

320(h)

x

330(d)

:

7.25Kgs

>:

180(w)

x

260(h)

x

140(d)

:

3.6Kgs

each

DIMENSIONS

AND

WEIGHTS

TS46

Main

Unit

(mm)

Weight

Speakers

(mm)

Weight

SUPPLY

DETAILS

Voltage

Frequency

:

397(w)

x

790(h)

x

370(d)

:;

21Kgs

>

260(w)

x

390(h)

x

140(d)

:

4Kgs

each

:

240

Voits

A.C.

only

;

:

50Hz

only

Flash

Test:

Tested

at

2.2kV

between

live

and

neutral

of

the

mains

lead

joined

together

and

all

accessible

metal

points

on

the

exterior

of

the

set.

Insulation

resistance

test:

Tested

between

the

live

and

neutral

of

the

mains

lead

joined

together

and

all

accessible

metal

points

on

the

exterior

of

the

set

to

show

a

resistance

of

at

least

4Mohms

at

500V

DC.

Earth

lead

continuity

test:

Tested

fora

continuity

of

less

than

0.5ohms

at

10

Amps

between

the

earth

of

the

mains

lead

and

the

record

deck

transit

screw.

if

there

are

any

doubts

about

continued

electrical

safety

after

servicing,

the

above

tests

should

be

carried

out.

:

Telephone:

0277

230222.

Telex:

995417

AMSELE

G.

AMSTRAD

PLC

BRENTWOOD

HOUSE,

169

KINGS

ROAD,

BRENTWOOD,

ESSEX

CM14

4EF.

ALIGNMENT

INSTRUCTIONS

Equipment

Required:

1.

AM

signal

generator

6.

Nonmetallic

alignment

tool

2.

FM

signal

generator

7.

AF

oscillator

3.

IF

sweep

generator

with

marker

capabilities

8.

Frequency

counter

4.

Oscilloscope

9.

Distortion

meter

5.

VTVM

Important:

.

Check

line

voltage.

.

Set

function

switch

to

band

being

aligned.

.

Set

the

loudness

switch

to

off.

.

Remove

the

antenna

from

the

terminal.

.

Set

tone

control

to

high.

.

Connect

low

side

of

signal

source

and

output

indicator

to

chassis

ground

(unless

otherwise

specified).

Ground

connection

should

be

kept

close

to

high

side

connection.

7.

Signal

input

should

be

kept

as

low

as

possible

to

avoid

AVC

and

AFC

action.

(Set

output

indicator

to

high

sensitivity.)

8.

Standard

modulation

is

1000Hz

at

30%

amplitude

for

AM

(1000Hz

at

22.5kHz

deviation

for

FM).

OmA

Gh

—

AM

IF

Speaker

output

LorR

4

ohm

load

Figure

1

AM

Section

Circuit

Alignment

|

Equipment

Connection

Dial

Setting

Adjustments

465

kHz

Tuning

gang

T3

(AM

IFT)

IF

a

niGae.

fe

(1000

Hz

Mod.))

fully

closed

Adjust

for

maximum

output.

(See

Fig.

1)

Repeat

until

no

further

improvement

can

be

made.

AM

BAND/TRACKING

I

‘a

hs

2feet

——

1

t

(60cm)

AM

SG

Speaker

G

A

output

s

poninidiene

|

jack

GO

Loop

Ant.

D>

ea

AM

Ant.

Figure

2

TRACKING

MW

WwW

FM

IF

FM

Section

LOCAL

OSCILLATOR

(BAND)

RF

AMPLIFIER

(TRACKING)

Circuit

Alignment

BAND

Circuit

Alignment

|

Equipment

Connection

|

Step

|

Gen.Freg.

|

Dial

Setting

:

Adjustments

Equipment

Connection

AM

Signal

Geneator

with

loop

antenna.

VTVM

across

4

ohm

load.

(See

Fig.

2.)

Dial

Setting

1

520

kHz

Tuning

gang

LS

(MW

Ose,

coil)

(1000

Hz

Mod.)!

fully

closed

Adjust

for

maximum

ouptut.

1650

kHz

Tuning

gang

TC6

(MW

Osc,

trimmer)

(1000

Hz

Mod.){

fully

open

Adjust

for

maximum

output.

i

ee

NS

Pa

600

kHz

Tune

to

L3

(MW

Ant.

coil)

AM

signal

Generator

(1000

Hz

Mod.)}}

signal

Adjust

coil

on

ferrite

core

for

maximum

output.

with

loop

antenna.

VTV

1000

kHz

Tune

to

TC3

(MW

Ant.

trimmer)

Macross

4

ohm

(1000

Hz

Mod.)|

signai

Adjust

for

maximum

output.

load.

(See

Fig.

2.)

2

an

Repeat

steps

4

and

5

several

times.

[BAND

«dts

280K

[Cid

TRACKING

|

t60/250kHz

|

Sweep

Generator

Step

|

Gen.Freq._|

Dial

Setting

T1,

T2

(FM

IFT)

1

|

10.7MHz

mang

9279

Adjust

for

maximum

symmetrical

response.

y

(10.7

MHz

at

the

center

point)

IF

sweep

Marker

generator

to

FM

Antenna

Terminal

TP1,

TP2.

Oscilloscope

from

“TP3

to

tc

TP4"

(See

Fig.

3.)

FM

signal

generator

to

antenna

terminals

(TP1,

2)

through

75

ohm

antenna

matching

network.

VIVM

across

4

ohm

load.

(Fig.

4)

1

87

MHz

Tuning

gang

L2(FM

OSC.

coil)

~

stretch

or

squeeze

(Mod.)

fully

closed

Adjust

for

maximum

output.

109

MHz

Tuning

gang

TC2

(FM

OSC.

Trimmer)

(Mod.)

fully

open

Adjust

for

maximum

output.

,

3

{|

«|

~—

J

Repeat

steps

1

and

2

several

times.

4

90

MHz

Tune

to

L1

(FM

RF

coil)

{Mod.)

signal

Adjust

for

maximum

output

—

stretch

or

squeeze.

5

106

MHz

Tune

to

TC1

(FM

REF

Trimmer)

(Mod.)

signal

Adjust

for

maximum

output.

Same

as

"LOCAL

OSC"

Repeat

steps

4

and

5

to

obtain

suitable

sensitivity

at

90

MHz

and

106

MHz.

FM

MPX

Frequency

counter

i

ass

5

IC3

12

gC

Hz

AMP.

Figure

5

FM

MPX

Circuit

Alignment

|

Equipment

Connection

Freq.

Counter

from

TPS

98

MHz

IEEE

to

ground

(Fig.

5)

(Mod.)

TAPE

SPEED/AZIMUTH

Dial

Setting

First

make

sure

FM

section

is

properly

aligned.

Adjust

R24

for

frequency

counter

indication

of

19

kHz.

Scope

Frequency

Counter

L131010/0]

|

a

Speaker

output

See

tien

tiie

ite

a)

Figure

6

HEAD

AZIMUTH

ADJUSTMENT

SCREW

Figure

7

Alignment

of

tape

speed

a.

Play

a

standard

test

tape

recorded

with

3

kHz

signal

(or

1

kHz).

(Equipment

connection:

See

Figure

6.)

b.

Adjust

variabie

resistor

in

motor

or

Deck

PCB

R113

to

provide

3

kHz

(1

kHz)

frequency.

Alignment

of

Had

azimuth

a.

Play

a

standard

test

tape

recorded

with

8

kHz

signal

such

as

TEAC

MTT-113CN.

(See

Fig.

6)

b.

Adjust

the

azimuth

adjustment

screw

for

maximum

output.

(See

Fig.

7)

Frequency

Counter

7

{2}0}0}0)

Hz

Figure

&

BIAS

FREQUENCY

Alignment

of

recording

bias

OSC

frequency.

a.

Connect

frequency

counter

to

VTVM

OUTPUT,

connect

VTVM

to

TP6

and

Ground.

(See

Figure

8.)

b. In

record

mode,

record

bias

OSC

frequency

must

be

72

kHz;

adjust

with

L7,

if

necessary.

c.

In

record

mode,

record

bias

voltage

must

be

E3=510,A;

adjust

with

R117,

if

necessary.

(See

Figure

9]

E3=(E1+E2)/2.

SW3-3

¢3

O

O~t—

Bias

R/P

R

®

fet

HEAD

®

A

VTVM

reading

Bias

Voltage

for

L

or

R

(E1

or

E2)

Set

Figure

9

ALIGNMENT

POINTS

SIMMS

5H

SEE

GT

SOR

OME

TS

TN

RS

©

my

“ae

th

a

we.

_

iar

%

ee

ia

whe

ME

ony

+

®

Sean,

a

‘

ware

OS

aa

*

lew.

[vy

ae

TROUBLESHOOTING

GUIDE

RECEIVER

SECTION

CIRCUIT

SYMPTOM

CAUSE

REMEDY

GENERAL

|

Inoperative

Defective

power

switch

(SW4)

Replace

as

necessary.

Open

circuit

in

transformer

(T601)

Check

current

and

voitages.

Replaces

as

necessary.

AM

Defect

in

power

supply

circuit

Check

current

and

voitages.

Replace

as

necessary.

Defective

volume

control

Check

volume

control

resistance

for

continuous

operation.

—

Replace

as

necessary.

Defective

function

switch

(SW2)

Replace

or

repair

switch.

No

sound

Defective

detector

Check

voltages

in

this

circuit.

Repair/Replace

as

necessary.

Open

circuit

in

AM

IFT

ANT

Check

voltages

and

resistance.

Coil

or

Osc.

coil

(T3,

L4/MW,

L5/LW)

Replace

as

necessary.

IF

misaligned

Re-adjust

(See

Alignment

Instructions).

Weak

sound

(low

sensitivity)

RF

misaligned

Re-adjust

(See

Alignment

Instructions).

Defective

IC2

Check

voltages.

Replace

as

necessary.

Resoider

and/or

repair.

Replace

as

necessary.

Poor

contact

in

Antenna

circuit

Defective

Band

switch

(SW1)

Repair

or

replace

switch.

Defective

in

Detector

Check

voltages.

FM

Open

circuit

in

FM

IFT

Check

voltages

and

resistances.

Antenna

coil

or

Osc.

coil

(L1,

L2)

Replace

as

necessary.

Weak

sound

Defective

FM

tuner

Check

RF,

IF

and

Detector

circuits.

(low

sensitivity)

Check

voltages

of

1C1

and

!C2.

Replace

parts

as

necessary.

RF

misaligned

Re-adjust

(See

Alginment

Instructions).

Defective

IC1,

1C2

Check

voltages

and

replace

as

necessary.

Poor

contact

in

FM

Ant.

Resoider

or

replace

as

necessary.

Defective

IC3

Check

voltages

of

C3.

Replace

as

necessary.

improper

adjustment

of

VCO

Re-adjust

R24.

(See

Alignment

Instructions).

MPX

Poor

separation

No

stereo

Indicator

|

Faulty

D4

Check

indicator

D4

and

circuit.

Replace

as

necessary.

continued

over......

SYMPTOM

CIRCUIT

REMEDY

on

both

channels

Power

supply

Check

voltage

of

transformer

of

Q7.

Replace

as

necessary.

on

Reh

(Lch)

Check

voltage

at

motor

(9V).

If

not

proper

voltage,

change

motor.

Pre-amplifier

Check

voitage

of

IC5

(Pin

11,

15).

Replace

as

necessary.

4

on

both

Lch

&

Rech

Power

supply

Check

voitage

of

C5

(Pin

2

or

14).

Replace

as

necessary.

Distortion

on

Reh

(ich)

Pre-amplifier

Check

voltage

on

6

of

IC5.

Replace

as

necessary.

Poor

high

frequency

|

on

Ach

(Lich)

Tape

head

Check

head

azimuth.

Re-align

as

in

the

alignment

instructions.

Replace

if

there

are

scratches.

Equalizer

amplifier

|

Check

voltage

of

IC5

(Pin

4

or

12)

Replace

as

necessary.

No

erasing

or

on

both

Lch

&

Reh

Bias

oscillator

Check

erase

head.

(Open

or

defective.)

no

recording

Check

erase

head

lead

wires.

Check

Osc.

output

voltage.

(72kHz

15V

rms.)

if

not,

reptace

Osc.

coil

L7

as

necessary.

Defectin

recording

|

on

Rech

(Lch)

Record

amplifier.

|

Check

that

rec-signal

is

supplied

to

R/P

head.

(no

recording,

weak

If

not

check

mic

Jack,

R/P

slide

switch

and

IC4

voltage.

recording

or

excessive

recording

Check

bias

current.

level)

If

not,

replace

Osc.

coil

L7.

DIAL

CORD

STRINGING

NOTE:

To

restring

the

dial

cord

set

the

tuning

gang

to

fully

closed

position.

nb

OWOONMAMAWN—

_—b

tb

nN

=

~

2d

RECORD

DECK

PARTS

LIST

Description

45

Adaptor

E-Ring

|

Turntable

Belt

Nylon

Washer

Spindle

Push

On

Retainer

Trip

Pawl

Clutch

Ptate

Slider

Catch

Motor

Base

(Plinth)

Cushion

Lifter

Lock

Bracket

Fixing

Screw

Motor

Pulley

Motor

9V

Plain

Washer

Lock

Washer

Nut

M4

Washer

Spring

Push

On

Retainer

Leaf

Switch

Tapping

Screw

M2

x6

Slider

Switch

Trip

Rod

Control

Lever

Assembly

Tapping

Screw

M3

x

10

P.C.

Board

Assembly

Bracket

Fixing

M3

x

10.5

Cue

Rod

Assembly

Pivot

Gimble

Tone

Arm

Cable

Wire

AWG

32

x

2C

Cartridge

CZ800-{

Hinge

Rivet

Stylus

ST800-1

Part

No.

200103

200213

200790

200122

200791

200841

200217

200218

200219

200842

200843

200821

200715

260229

200844

200788

200787

200223.

200776

200845

200772

200846

200847

200778

200768

200769

200770

200108

200785

200109

‘

age

EXPLODED

VIEW

(Cassette

Deck

1)

CASSETTE

DECK

PLAY

Main

Base

Assy

201151

Switch

201152

Push

Button

Actuator

201153

|

Play

Button

Lever

201154

!

RWD

Button

Lever

201155

|

FF

Button

Lever

201156

Stop

Button

Lever

201157

Pause

Button

Lever

Assy

201158

RWD

Lever

201159

Pause

Lever

201160

Pause

Lever

Spring

201161

Pause

Stopper

201162

Button

Lever

Spring

201163

Sub

Chassis

201164

Play

Button

Lever

Spring

201165

E

Kick

Lever

201166

Actuator

Spring

201167

Auto

Lever

201168

Auton

Lever

Spring

201169

Button

Lever

Spring

201170

Leaf

switch

LSA-115R

201171

Switch

Actuator

Spring

201172

Metal

Guide

201173

Head

panei

201174

Head

Bash

201175

Sensing

Plate

Assy

201176

Head

Pane!

Spring

201177

PR

Stopper

201178

PME

Screw

201179

Spring

201180

Pinch

Roller

Assy

201181

Pinch

Roller

Spring

201182

RF

Pulley

Arm

Assy

201183

RF

Puiley

Arm

Spring

201184

RF

Beit

201186

Fiywheel

Assy

201187

Reei

Base

Assy

201188

Take

Up

Gear

Plate

Assy

201189

Take

Up

Roller

Gear

201190

T.G.

Plate

Spring

201191

FF

Gear

201192.

Back

Tension

Spring

201193

Supply

Reei

Assy

201194

Take

Up

ree!

Assy

201195

Back

Tension

Spring

201196.

Motor

Pulley

201200

Main

Beit

201201

Eject

Slide

Lever

201202

Eject

Slide

Lever

Spring

201203

Pack

Spring

201204

Play

Head

201205

Erase

Head

201219

Motor

201206

Operation

Lever

201207

Button

Frame

201208

Button

Lever

Shaft

201209

CASSETTE

DECK

RECORD/PLAY

Button

Lever

Spring

Erase

Head

Spring

Record

Safety

Lever

Leaf

Switch

MSW-1373NBK

201170

201211

201212

201213

EXPLODED

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Deck

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AMSTRAD MS-45/F User manual

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