Revox A77 TECHNICAL SERVICES

Service

Manual

S03i't-6o

RE.Vax

For

Service

Manuals

MAURITRON

Tel:-011144-351694

Email:-

TECHNICAL

8 Cherry

Tree

Oxon

enquiries@mauritron.co.uk

Contact

SERVICES

~d.

Chinnor

OX94QY

F~x:-01844-352554

_3LJ~

A77

-

I

1.

CONTENTS

r

'

.l

2.

GENERAL

Front

3.

DISMANTLING

3.1.

3.2.

3.3.

3.4.

3.5.

3.6.

3.7.

3.8.

3.9.

3.10.

3.11.

3.12.

3.13.

4.

MECHANICS

4.1.

4.2. Tape Tension

4.3.

4.4.

4.5.

4.6.

4.7. Lubrication

4.8.

Removal Removal Removal Removal Removal Removal

Removal Removal Removal Removal Removal Removal Removal

Headblock

4.1.1.

4.1.2.

Brakes ( Stop )

4.3.1.

4.3.2.

Pressure

4.4.1.

4.4.2.

4.4.3. Exchange

4.4.4.

Capstan

4.5.1.

Exchange

End-of-Tape Switch

Panel

Rear

Panel

of

Housing

of

Cover

Panel

of

Front

Panel

of

Power Switch

of

Brake

Unit

of

Reel

Motors

of

Capstan

of

Control Board

of

Power Transformer

of

Amplifier

of

Potentiometer

of

Switch Board

of

Frame ( Removal

Tape Guides Head

Brake Torque Measurement Brake Adjustment

Roller Pressure Pressure

Pressure

Motor

Removal

of

Reel

Motor

Cards

of

Mounting

Measurement Solenoid Readjustment

of

Pressure

Lever Readjustment

of

Capstan

Motor

Roller

Axis, Ball

Bearings

Rotary Switches)

Bearings

Page

4

5

6

6 7 7

8

9

10

11

12

12 12 13 13 13 13 14 14 14 14 14

15

15 16 16 16

t

•

' 2.1.

-

f

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]~

......

I

I I

I

ELECTRONICS

5.

5.1.

5.2.

5.3. Record

5.4.

5.5.

5.6.

5.7.

5.8.

5.9.

5.10.

6.

ELECTRICAL

6.1.

6.2.

Switch Board Input

Amplifier

Oscillator Record Relay Playback Power Power Supply Drive Control

5.9.1. Photoelectric End-of-Tape Switch

Speed

Demagnetizing Tape

Speed

6.2.1. Pick-up

6.2.2.

6.2.3. Tacho Adjustment

and

VU-Meter Board

Amplifier

Regulation,

ADJUSTMENTS

Tacho Adjustment

( Loudspeaker

Capstan

Head

• Adjustment

Amplifier)

Motor

AND

MEASUREMENTS

with

Cathode-Ray Oscilloscope

18

19

20 20

20 21 21 22 23 23

26

26 26 26 26 26

r-

•

I

..,.

'

L

~

'

•

6.3. Playback Adjustment 26

6.3.1. Azimuth Adjustment, Playback Head, Coarse (Max

Level

) 27

6.3.2. Azimuth Adjustment, Playback Head, Fine (Phase Method) 27

6.3.3. Playback

6.3.4. Frequency Characteristic, Playback

Level

from Test Tape 27

(from

Test Tape) 27

6.4. Oscillator and RF-Adjustment 28

6.4.1.

RF-

Voltages and Frequency Checking 28

6.4.2. Dummy Load 28

6.4.3. AF-Traps, Record 28

6.4.4. RF-Traps, Playback 29

6.5.

Record·

6.5.1. Azimuth Adjustment, Record

Adjustments 29

Head,

Coarse 29

6.5.2. RF-Bias 29

6.5.3. Azimuth Adjustment, Record Head, Fine 30

6.5.4. Record

Level

30

6.5.5. Record Equalization 30

6.5.6. Frequency Characteristic

via

Tape 30

6.6. Distortion Factor Measurement 30

6.6.

1.

Distortion Factor (via Tape), VU-Meter Calibration 30

6.6.2. Noise Voltage (and External Voltage)

6.6.3. Noise Voltage, External Voltage

via

"Before

Tape

Tape"

(Check)

31 31

6.6.4. Erase Attenuation 32

6.6.5. Crosstalk, Mono 32

6.6.6. Crosstalk, Stereo 32

6.7. Output Voltage Check 33

6.8.

Wow

and Flutter 33

7.

ACCESSORIES

8.

7.1.

7.2.

MODI

8.1.

8.2.

8.3.

8.4.

8.5.

8.6.

Remote Control Timing Switch Operation

Fl

CATIONS

Rewind

Switch Noise

RFI Transfer Play Sensitivity Replacement of Capstan Motor Capstan Motor with Sleeve Bearings

8.6.1.

9.

TROUBLE SHOOTING

10.

9.1.

9.2.

DIAGRAMS

Faults Faults

Tape Drive VU-Meter Board Switch Board Input Amplifier Record Amplifier Oscillator Record Relay Playback Amplifier Loudspeaker Amplifier

Speed Control

Removal of Capstan Shaft and low-friction Thrust Washer

in

the Drive

in

the

Circuitry

1.077.100

1.077.480

1.077.435

1.077.700

1.077.705

1.077.712

1.077.715

1.077.720

1.077.850

1.077.725

Diag. Diag. Diag. Diag.

Oiag.

Diag.

Diag. Diag. Diag. Oiag. Diag.

34

34 34

35

35 35

35 35 35

36

36 39

1

2 3 3 4

5

6a 7

8

9

10

11.

REPLACEMENT PARTS LIST

12. SPECIAL VERSION

12.1. Revox A77 -

DOLBY

For

Service

MAURlTRON

8

Cherry

Tel:·

01844-351694

Email.-

Manuals

TECHNICAL

Tree

OxonOX94QY

i::~x:-

enqumes@maumron.co.uk

Rd,

Chinnor

01844

Contact

SERVICES

• 352554

2.GENERAL

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l

The Stereo-Recorder can be obtained as CHASSIS, NUT CABINET, and CARRYING are

the

applicable codes ( order numbers I

With 2 Output Amp

Wood Cabinet Wood Cabinet Carrying Case Chassis Chassis

Outline and Installation Dimensions, see : S 1

Following codes apply

Output Walnut Cabinet 1950 Carrying case, incl. Cover and

The basic configuration

A pressure cast aluminum alloy chassis supports drive, one All

Amplifier

amplifiers are plug-in modules.

(per

is

the

electronically regulated capstan motor.

With 2x2

Loud-

I.

speakers 2-Track

x 1122 x x 1222

x

to

accessories only :

Channel ) 1900

2x2

is

identical for

CASE

1102

1302 1304 1322

Loudspeakers 1960

all

models.

WAL-

models. Here

Codes

4-Track

1104 1124 1224

1324

the

3-motor

An

exchange service

Faulty cards will be exchanged factory representatives applies board, regulator, motor control, switch board

This permits a very efficient service, limiting, repair work

to

etched circuit boards with connectors ( control

to

finding the faulty module.

is

organized for the circuit cards.

at

minimum charge by

in

the respective country. The same

}.

in

most cases,

i

'

-

I

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-

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1.

-

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•

2.1. Front

Panel,

(Numbering corresponds

manual)

Rear

Panel

to

REVOX

Fig.

2.1-1

A

I

08 09

For

MAUAITRON

8

Tel:·

Email:-

10

Service Manuals Contact

TECHNICAL

Cherry

Tree

Oxon

01844-351694

OX940Y

Fax:-

enquiries@mauritron.co.uk

SERVICES

Rd,

Chinnor

01844-352554

8

07

A

Push

buttons

< <

>>

PLAY STOP

REC

VU-Meters, record pre-selector buttons

B

Record Depress

Record

Depress

Record Stereo ( both tracks ) :

Depress

Fast

rewind

Fast

forward Playback Stops all operating functions Record (depress simul· taneously

CH

I ( upper track ) :

left record pre-selector button

CH

2 ( lower track ) :

right record pre-selector button

both record pre-selector buttons

PLAY)

Fig.

11

2.1-2

25

2.1-3

12

26

13

14

27

28

15 16

29

30

17

31

18

07 Power switch, tape 08 09 Microphone socket,

25

26 27 28 29

30 31

Headphone socket ( 200 • 600 Ohm )

Microphone socket,

10

11

Playback volume control

Playback mode switch

12

Balance control

13

14 Before-and-after tape switch

15 Record volume control,

16

Input

selector, 17 Record volume control, 18 Input selector,

Remote control plug Loudspeaker socket ( DIN, 4 ·

AUXILIARY -Input Microphone RADIO, DIN connection: Input 2,5

Output 1,2 V OUTPUT ( 2.5 V I 600 Ohm ) Socket

for

power cable

CH

Input

speed,

CH CH

CH

1

CH

2

( 35

( .15/2,5

tape tension

1

2

1

2

16

Ohm}

mV)

mV

3. DISMANTLING

Table

of

Wire Colors

3.2.

- Undo screw A (fig. 3.2

Removal

Tilt access

rim, 3 retainers).

of

lid

down. Pull

Cover Panel

off

head cover.

-4

).

Pull cover panel

off

(Upper

-

!

red red org yel yellow jaune grn green vert blu blue bleu vio brn gry blk black wht

3.1.

- Set instrument face down control

- Remove housing fasteners. Pull housing carefully upward. Disconnect loudspeaker connectors ( fig. 3.9

- Reinsert remote control plug.

- Bridge power disconnect jack ( 2-pole protective disconnecter

orange

violet brown gray

white blanc

Removal

dummy

-13

l with

of

Housing

plug.

)

two

rouge

orange

violet brun Braun gr is noir

on

soft basis. Remove remote

in

the

carrying case.

insulated banana plugs.

Rot Orange Gelb

Grun

Blau Violett

Grau Schwarz Weiss

on

regulator card

Fig.

3.2-4

3.3. Removal of

Undo screws B ( knob

as well

ring

of

power switch.

- Pull up monitor panel ( 4 retainers).

3.4. Removal

- Disassemble retaining ring switch)

- Unfasten 3 screws. Remove power switch carefully.

- Take

off

plug connectors.

Front

Panel

fig.

3.2

-4

).

Pull

out

power switch

as

all

rotary knobs and discs. Save retaining

of

Power Switch

of

slide switch ( equalization

1

i

I

I I

Fig.

3.4-5

(

View

from

below )

..-------------

~--------

brn

blu

red

CD

CF

1

2

1

I

F

D

Fig.

3.5-6

3.5. Removal of Brake Unit

- Remove cover panel per 3.2.

- Remove reel plates { 3 screws

- Brake drums: Undo center screws A (

loosen brakes and lift drums carefully upward.

Be

careful

linings. Grease traces reduce braking effect.

- Remove connections B (fig. 3.5

- Separate cable bundle (shielded wires)

- Remove 3 chassis screws D (fig 3.5 carefully out.

0

..

0

:E

iii

blu (grn/blk)

Ill

a:

bm (yel/blk)

...

~

.E'

a:

not

yel grn

to

kink brake bands. Don't touch brake

013 014

-

015

-

016

-

c:::a

c:::a c:::a

c:::a

c::i

c:::I

c::i

each).

-6

).

-6)

fig.

3.5

at

C (fig. 3.5

and lift chassis

c

-6

-6)

For Service

MAURITRON

8 Cherry Tree Rd, Chinnor

Tel:-

01844·351694

Email:·

3.6. Removal

- Remove brake drums per 3.5.

- Remove frame screws E ( fig.

),

- Unplug

- Unplug motor cable connectors; right reel motor, regulator card ( (

fig.

output

3.6-8

Manuals

OX94QY

Fax:-

01844-352554

);

Contact SERVICES

3.5-6

(if

present).

left reel motor, control card

TECHNICAL Oxon enquiries@mautitron.oo.uk

of

Reel Motors

amplifiers

fig.

3.6-7

).

E

n

0 D

0111

...

LI. LI.

a.

Left

:!!!

.Cl

......

E

E)

:I

:is

Reel

IN M Lt:I LI.

LI. LI.

G:i'

>:is

......

!

c

...

.Cl

Motor

c

15.

Fig.

3.6-8

······'

-~

..,

u. c -

~

Fig.

3.6-7

- Remove 4 reel motor screws F each ( fig. 3.5 lower motors carefully.

-6

) and

3.1. Removal

-

Remove Disconnect capstan-motor tions

are Note: For improved signal

motor

connections may the following manner: Carefully note wire colors before disassembling.

- Undo

-

cable

Remove Unscrew The other they retain the headblock itself. Remove lutely against bumping (axis run-out .001

mm =

of

Capstan

output

amplifiers (

on

control card ( fig.

clamps A ( fig.

cover

and

monitor

motor

fasteners B (fig.

screws

on headblock

capstan

motor

40

micro - inch ! )

Motor

if

present).

and

pick-up cables; connec-

3.

7

-9

).

to

noise

performance, the capstan

be

reversed

E3

= gry,

3. panels

carefully downward. Guard

7 - 9

3.7 -10)

on

E4

).

per 3.2.

shall

some

yel,

and

not

is

recorders in

E5

= grn.

3.3. on headblock. be

touched

better than

as

abso-

//

!

IE)--A

//!//

Fig.

3.7-9

Capstan Pick-up

Motor

B

,....N

ww

c

:I

.C:E

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-

I

i

3.8. Removal Remove

- Undo

-

Photoelectric I

End-of-Tape Switch

screws

ward.

Remove

of

Control Board

cover

and

A( fig.

connectors

front

grn

grn FH2 •

vioOF4 •

yel DF2 -

panels

3.8-11

as

needed.

FH1

per 3.2.

).

Pull control board down -

•

and

3.3.

blu FG6

bm

FG1

lorgFM1D

I blk

I blu

Fig.

FB1

FM2

3.7-10

I org

FG3 I -+-----l'wht

I I I blk FG10

grn

FGS

.

D

Remote Control

FG9

vio

FG7

I I I

I

11

I

Fig.

3.8-11

I

u..

""'

Cl

>

&

I I

M

u..

0

..

.t:.

J

...

u..

(,J

]

I

...

..,

u..

~

I I I

...

u..

""'

c

:i'

...

Cll

:i5

--

E

.!!J

:I

:a

...

N M

u..

l.

I I

u..

:i'

:a

......

q;

..?;

c

...

.a

..

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u..

c

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3.9.

Removal

- Remove

- Disconnect brake solenoid cables ( unsolder I per fig.

3.5-6,

- Disengage cable

board ( fig. 3.6 - 7

Disengage cable

control Note: For

improved signal

motor

connections may

the

following

Carefully

Right

yol

grn blu (grn/blk) brn (yel/blk)

yel

010 e

red

011

grn

09

brn

012

of

Power Transformer

output

amplifiers

B.

to

board

(fig.

manner: E3 = gry, E4 = yel,

note

wire colors before disassembling.

Reel

Motor

013 \ ....---.......,

014

015 016

yel

017

blk

gry OF4 •

brnCD1 • bluC02

----11--e

wht

----11--•

vio

-

DFJl

•

OF3

-

OY1

-

• I I •

•

(if

present).

right-hand

).

capstan

3.7

-9

to

noise performance, the capstan

be

ewht

wht

__J

reel

motor

).

reversed on

04

• gry

03 • gry

motor

on regulator

and pick-up on

some

recorders in

ES

Switch

01•

02••

L

1·

L.

motor

= grn.

eo

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Built-in

Fig.

3.9-13

Loudspeaker

Fig.3.9-12

-

c:

..

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<(

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2!

-

0

w

o;

>

-

N

w w

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2i

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Pick·up

o:1

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UAURITRON

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Capstan

Motor

Service

Manuals

8 Cherry

TECHNICAL Tree

0YonOX94QY

01844-351694

enquiries@maulitron.ro.uk

Rd,

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Output

Contact

SERVICES

Chinnor

01844-352554

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OG2

Unscrews transformer fasteners and remove entire

bly

carefully downward.

Pull

off

circuit

cards and corresponding connectors

needed (fig. 3.9 - 12 and

3.9-

13).

~

II

D

lo

..

"'

~

c..

E

...

<(

a

Q,

c:

...

-

Q.

Fig.

~

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3.10-14

assem-

as

111

3.10. Removal

- Mark record and playback amplifiers before removing. The amp I ifiers places

to

- Remove cover panel on the cards.

I

of

Amplifier

have

maintain correct level settings.

I

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lol

Cards

to

be

reinserted in their respective

front

I

D

side

I

and

pull amplifier

I

3.11. Removal

- Unsolder wires.

- Unscrew fasteners from below ( fig.

of

Potentiometer

3.11

-15

.,

r

)

VOLUME

yel

P

301

CH

I

P 302

CH

II

red grn

Fig.

3.11-15

3.12. Removal

- Remove plug-in amplifiers (fig. 3.10

- Remove pusher mechanism (screws

- Remove shield (screws B Remove

- Connectors:

Fig.

3.12-16

of

reset

spring C ( tape

disengage

Switch Board ( fig. 3.12

).

lift

lever

headblock-VU-meter board.

B

).

A).

).

vio HB7

blu HB6 grn HB5

yet HB4 org HB3 red HB2 brn

HB1

c

grn

--....::::;:;---;==:i==:- blu

P 303

CH

-16

)

---

-

BALANCE

I

brn org

E

red

LEVEL

yel

blk

P 306

P 307

CH CH

I

II

blk

red

org

-

I

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IX)

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11

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3.12-17

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For

Service Manuals Contact

MAURITRON

Tel:-01844-351694

Email:-

TECHNICAL

8 Cherry Tree Rd, Chinnor

Oxon

OX94QY

Fax:·

enquiries@mauritron.oo.uk

I

SERVICES

01844-352554

Playback

Head

CH

II

~

,._..__

l:

~

!:

~

D

Playback Head CH I

c

..0

"Cc

...

---

!

...

..c

~

OUTPUT

-

,..,

en

o:i

CJ

CJ CJ

<(

<t

<t:

0

E

·;;;

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Switch Speakers Off

"'

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Cl

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- Remove power switch retaining rings and fasteners Lower power switch carefully ( avoid linkage rod

- Disconnect all terminals on the switch board ( fig.

3.12-17

- Unscrews 5 fasteners E ( complete assembly forward.

- Disengage remaining VU-meter connections.

Position

at

reassembly. Adjust screws F (fig. 3.12

(see also

).

fig.

of

the equalizing slide switch has

5.

1.

).

3.12

-16

) and remove

to

-16)

be checked if necessary

D.

Observe, furthermore,

).

( trip lever of playback cut-off

lever).

3. 13. Removal

- Unscrew VU-meter carrier; lift off carefully ( observe playback cut-off contact S 5 behind VU-meter

- Pull connectors from Jacks. (

- Unscrew rotary switch fasteners from above. Disconnect ground strap ( brown

that

pressure roller

contact

of

Frame ( Removal of Rotary Switches l

fig.

).

Remove carrier.

S 5, left

3.13-18

is

in

rest position

).

of

release

board).

Fig.

3.13-18 Phones

red

Mic

I

brn red

Mic

II

4.

MECHANICS

The

three-motor service urements

of

the

mechanical section.

are limited

drive assures almost maintenance-free

to

the

few movable parts.

Adjustments

and meas-

4.1. Headblock

Tape guides

Special

Retaining ring pliers

Spring scales av}.

B

Azimuth Adjustment Azimuth Adjustment Don't disturb ! Record Head Playback Head

c

tools

needed ;

or

contactors

200 g ( 7 oz.

A

@

) =

av),

2000 Q ( 4.4 lb.

I

...

-

I

Fig.

4.1-19

4.1.1.

- Clean tape

( near

Height Adjustment

Tape

guides

(fig

tape

guides;

don't

guide A, unscrew

upper

end

of

4.1

-19)

disturb

only

capstan

B

tape

the

axis

guide

fastener

}.

A!

to

c

To

the

remove

block

Height Adjustment

4.1.2. Head Mounting

Record

base plate which

3 screws A.

Don't

can

If

setscrews D are

B

c =

and

playback heads are

is

fastened in

disturb

be

removed while base plate

height

setscrews D (height adjustment). The heads

adjustment

turned

Azimuth Azimuth

adjustment, record head adjustment, playback head

is

( fig. 4.1

required

by a like

mounted

turn

is

off

after

amount

-20

}

to

the

headblock with

(fastening change,

front

on a common

E).

the

respective

and back.

(per 6.5.1.)

(per 6.3.1.)

I I I

T

.l

Fig.

4.1-20

E

Once adjustments are made on the headblock,

screws must

Note:

For improved signal

to

both playback head channels may recorders from the wiring shown the colored conductors terminal.

4.2.

- Cover light

Measurement values are taken on a core of diameter

115 mm ( 4,5 "

- Load and lock empty reel.

- Wind several turns of thread on empty

thread

the following values:

be

resecured with lacquer.

When

replacing heads, re-wire

Tape Tension

at

the optical end-of·tape switch.

off

slowly

to

noise performance the connections

be

in

Diag.

will

be

soldered

).

in

the sense indicated, resulting

the

loosened

reversed on some

3, in

other

to

the right-hand

in

the same manner.

reel

and pull

words

in

Check operating voltages of reel motors and phase shift capacitors and section " Modifications " per 8.1.( Rewind

4.3. Brakes ( Stop l The stop brakes are effective with solenoid de-energized.

- Push STOP button.

4.3.1. Brake Torque Measurement Preparation for measurement per 4.2.

Correctly set brakes have following torques:

60-90g (

2.1

if

- 3.2 oz.av)

these values

aren't

attained; see table 5.9

).

60-90g

( 2.1 - 3.2

oz.av

-46

)

l

I

A

~mm

Fig.

4.2-21

Function

PLAY

PLAY tape tension,

« »

Table

7 .5 ips

tape tension,

4.2-22

: ( 4.5" ) ( 4.5" ) :

c = = = =

I I

-:..

= ·::::::i

L--------J

or

3.

75

ips

high

low

A

70

gr

( 2.5 oz.av)

30 :ir

( 1 oz.av)

210

gr

( 7.4 oz.av)

about

20

(.7

oz.av)

B

( 3 oz.av)

( 1.75 oz.av)

about 20

( .7 oz.av)

gr

( 8.1 oz.av)

B

85 gr

50

230

gr

: ( 4.5" I ( 4.5" ) I

140 · 175 g

( 5 • 6.2 oz.av }

Fig.

4.3.2. Brake Adjustment Check brake system

reached. Brake linings and bands must be absolutely clean and free lay up full-width on lining.

Details on the modified brake system (brake return spring attached page PL 7a of the parts list. Brake mechanism and solenoid stroke are reset after exchanging band and/or linings.

J_ --- - - - - -

I-

- - - - - - -

I I

1...--------'

4.3-23

of

grease. Brake bands must be devoid of kinks and

to

both ends of

~

-,

For

Service

MAURITRON

8 Cherry Tree Rd,

Tel:-01844·351694

Email:-

if

above mentioned torques are

Manuals

TECHNICAL

Oxon

enquiries@maurilron.oo.uk

the

brake-band) are shown on

Chinnor

OX940Y

Fax:-

01644-352554

140 175 g ( 5 -6.2

oz.av

Contact

SERVICES

I

not

Fig.

4.3-24

Brake

Adjustment

( Brake

Adj

Lever )

-------.

- Loosen brake manually

- Check if crew till

- If necessary, bend

The solenoid has

- Cover light

- Depress " Reel Motors ( fast rewind

- Loosen fastening clear rollers by from Secure solenoid during this adjustment. Braking can be varied by hooking springs the

both

brakes clear simultaneously; if

the

3 chassis fasteners partly, slide chassis around

both

bands are clear.

to

at

the

).

brake adjustment lever.

(push

in solenoid

one

brake adjustment lever.

be

energized for adjustment.

optical end-of-tape switch.

off

" ( 42

),

depress

of

solenoid

.1

and

·.2 mm ( .

reset so

040"

to

at

different places on

core).

4.4. Pressure Roller

The pressure lever is

is

set

by

the

variable spring force {fig. 4.4

actuated

electromechanically. Pressure

-25

4.4.1. Pressure Measurement

- Load

- Switch on PLAY.

- Tie nylon

- Screw C sets pressure force.

tape

with 1 kHz record.

thread

to

pressure roller axis ( affixed and pull with a spring scale sound volume The spring scale must show 1.5

thereto

)

drops

(or

noticeably.

contactor)

kg

( 3.3 lb.

not

button

that

the

bands

.

080")

torque

).

or

to

a pin

in sense A till

av).

uns-

<<

4.4.2. Pressure Solenoid Readjustment

- Switch instrument light

at

optical end-of-tape switch.

- Slide pressure solenoid is

.3

mm

(.

- Block pressure solenoid. Check

if

.solenoid core

not

move if

axis.

- Secure fasteners Check pressure, reset screw C if necessary.

4.4.3. Exchange

Hold pressure roller axis

4.4

-25)

and remove bolt fastening E

- Pull pressure roller axis sembly

Make sure while cleaning

is

explained

that

to

PLAY.

to

012")

the

lever

of

Pressure Roller

no cleaning fluid gets

the

roller.

the

is

in

end position. The core shall

is

pulled slightly from

solenoid with a

at

up

and roller

in

the

replacement parts list.

If

no

tape

is

loaded, cover

right gap B (fig.

the

drop

of

lacquer.

groove from above I fig.

to

the

side.

to

the

to

the

sintered bearing

4.4.4. Pressure Lever Readjustment

After exchanging

just

it

with respect

lever

is

stopped ( solenoid core fully

between capstan axis and pressure roller shall be

(.4").

the

pressure lever, it

to

lever F I

fig.

is

necessary

4.4

-25

out

).

),

the

4.4-25)

capstan

side. Reas-

to

read-

When

the

distance

10

mm

l I

Fig.

E

---

4.4-25

A

1,5

kg

( 3.3 lb.av)

-(§>

-~:

B

0,3mm

(

D12"

I

l

0

I

(;.~1

If

II

''#

,.,.A

I

~-,

I {t

..

'\

~

I

\.

,

-----

:I--~

/!

i

I

,::-,

l

1 t } l I

-t-~'::,,1

!

I I

\ _ _,;

I

--

1

I

~/

l

0

'

-

c~~~~-1-------1..-1-~~~~-t-t---

0~~~~1---+--1-~~~~.

Fig.

4.5-26

ATTENTION Capstan Motor with Sleeve Bearings

Modification effective from

serial

Nr. S 60483

G

78003

see section 8.6./page

35

For

Service

MAURITRON

8

Cherry

Tel:-01844-351694

Emal!:-

Manuals

TECHNICAL

Tree

Oxon

OX94QY

f'lx:-

ellQuiries@mauritron.co.uk

Contact

SERVICES

Rd,

Chinnor

01844-352554

- Unfasten securing clip

- The axis can be taken

A.

Lower capstan rotor.

out

through the top if the tape guide between playback head and capstan axis has been screwed off

-

If

the

be lowered with bearing

(don't

disturb guide setting).

retaining ring B

is

removed, the capstan axis can

C.

4.5. Capstan Motor (with

Ball

Bearing)

Fig.

4.5.-26

(Control circuitry see 5.10 & 6.2. )

The capstan axis goes complett:ly through the motor. is

held by a sintered bronze bearing ( D ) and below by a

ball bearing. Both bearings are lubricated for their life and should normally require no service. Capstan axis and ball bearing can be exchanged very easily. A defective sintered bearing ( Disassembly see para

4.5.1. Removal of Capstan Axis, The capstan motor need not

hP:lrinn

is

n11T

to

be sent

to

the nearest factory representative.

3.

7.

)

Ball

Bearings

be

removed to get

ax.is

and

It

Bearing C

is

a special tight tolerance part and shall be

exchanged only with an original bearing.

Special care must be taken with handling axis and bearings

to

avoid demage or entry of dust into

the precision parts ( run-out better than

40

micro - inch !

).

the

1/1000

capstan

·mm =

Instructions for installation of the new no-turn device A in

conjunction with old rotors are given on page PL 9 of

the parts I ist.

4.6. Exchange

- Remove

- Remove brass sieve A. Open clip B and retaining ring C

with retaining pliers, open only wide enough to pull them away. Lower rotor with axis

The belleville springs (see parts list

shaft.

of

reel

motor per 3.6.

Reel Motor Bearings

out

PL

of motor frame.

8)

remain on the

•

Fig.

4.5-27

In

addition justment of these parts on The original bearings.

4.

7. Lubrication

All

bearings are lubricated for their life and should normally require no service. They shall original bearings, in case axis

is D ( MOBIL

to

reel

motor

exchanged,

fig.

4.5

DTE

sleeves A there are washers 0 for height

the

brake drum ( reel plate

the

same motor axis at assembly.

ball bearings shall exchanged only with

be

of

malfunction. If

the

upper felt washer

-26

)

is

to

be lubricated with some drops

extra heavy.

).

Be

sure to put

exchanged only with

the

of

sintered bearing

I

11

I I

I

ad-

l

capstan

End-of-Tape Switch ( Operation: per 5.9.1. )

4.8. The light source

removed by lifting it upward.

of

the

optical end-of-tape switch can be

-'-

l

}

J

1

I

5. ELECTRONICS

The electronic circuitry

modules for the most part. There are etched circuit card

plug-in modules for :

- Input amplifier, record amplifier, playback amplifier, oscillator, and record relay.

- Output amplifier.

There are several etched circuit boards, rigidly mounted but

with plug-on connectors for:

- Regulator

- Drive control with photoelectric end-of-tape switch.

- Capstan motor control.

is

divided into groups, plug-in

Plug-in Output

Ampl.

Plug-in Amp!. Capstan Motor

Regulator

Control

Power Supply

Drive Control

Block Diagram ( Amplifiers ) The block diagram shows the relationships between the

plug·

in

amplifiers.

B•ior.tAf\'l!l'T~Swiieh

!EC

INPUT

1S"IV

NAB

,,.,

Fig.

5.-28

For

Service

MAURITRON

Cherry Tree Rd, Chinnor

6

Oxon

Tel:·

01844-351694

Email:·

enquiries@mauntron.oo.li!.

SPEAKERS

o"

,.....

______

I

~-Amfl!'•h"'

.....

'---------(

....

j t

-!(

I I

'-------

,.---M,-----l

.....

-------.

I

ro-

-il

H

I I

'-------

~..,....

1-4.....__

Manuals

TECHNICAL

OX940Y

Fax:·

01844·352554

.....

I

8W

I

r---<

.....

Ampht.tr

I

3-W

l---c

.....

Contact

SERVICES

SPEAKER I

RAOIO

I

OUTPUT l 2,S

~AK~R

ll

Y

MtC

"""

f

>--+-1--el

:-----

'

i-~-~~

e

5.1. Switch Board and VU-Meter Board Diagram

( Removal per 3.

The switch board carries plug-in amplifiers

amplifiers

balance and volume. The shielded inputs can be plugged on

the

amplifiers as well as

amplifiers can also be plugged

The equalization slide switch

power switch. It has to be readjusted This The switch terminal contact areas for input selector, before· and-after tape switch, and playback functions are printed directly on the board. The rotary switches are encased and

indexed against misorientation. Check fig. and spare parts I ist.

No.

1.077.435 & 1.077.480 )

12

)

(without

),

control switches and potentiometers for inputs,

switch board (below, left-hand). Inputs for playback

is

done with screws F (

contact

configurations. Assembly information

outputs

for OUTPUT and

in

( right-hand

is

controled through the

in

case

fig.

3.12

-16

).

5.1

).

of

exchange.

-32.

for case

is

output

in

the

Fig.

5.1-30

0 0 0 0

o_

r1

f

j

•

nn

-

I

Inputs

I I I I I I

D

Fig.

5.1-31

CH

II

Playback

Head

CH

II

~

"

,....,._

~]

~

....

I I I I

I I I

-

Lamp, end·of·tape switch

Playback

Head

CH

_,.,___

"

c:

~li

..ci

c:

....

I

...

]

OUTPUT

~

en

co

(!)

t:l

<(

c

0

·:;;

Jj

.....

(!)

<(

E

c:n

>

.....

N

+

....

a

<(

"C

~

I

l

I

D

. I

Switch Speakers Off

r

..

l

1

Before I After Tape switch ( Playback selector )

Fig.

5.1-32

The VU-meter board

connectors. It carries the preselector buttons for

and

CH

2; they switch the record-erase signals. ( Note the audio signal has amplifier when neither button

is

linked

to

the switch board by

to

be switched inversely on the record

is

depressed ! )

For

MAURITRON

8 Cherry Tree Rd, Chinnor

Tel:-01844·351694

Email:-

D

Fig.

5.1-33

Playback

Mode Switch

Service

Manuals

TECHNICAL

OxonOX94QY

enquiries@maurilron.co.uk

CH

1

that

Contact

SERVICES

Fax:-

01844-352554

Resistor R 406 I R

parallel resistors for this purpose. shorted, amplification of the whole stage with 1 K resistor A = 1.2 approximately. Parallel resitors R 316 I

R

317 ( CH

board 1.077.435. The advantage

Output

up

to This corresponds than sensitivity matching

has

the

Input selector

426

( 100K )

in

parallel A = 1 ) and R 321 I R 322 (

that

the supply voltage can be fully modulated.

voltage

6 Vac undistorted.

40

the

advantage

series-connected voltage divider.

is

to

dB. Aside from the overmodulation stability,

20

output

nominally 50 mVac,

an overmodulation stability of more

of

the

in

that

is

bridged or reduced by If

R 406 I R 426

is

A=

approx, and without parallel

CH

2)

stage configuration

but

input stage through feedback

input noise

is

not worsened by

460

approx

are on switch

has

the

it can deliver

is

5.2. Input Amplifier ( 1.077.700)

l~~csj@I

9

~olo~~~~

I

Fig.

5.2-34

The input amplifier card contains the pre-amplifiers for both channels.

Input sensitivity feedback (d.c. feedback fixed) AUXILIARY ( 2,5

mV

),

low ( .15

rnV

is

matched through a stepped variable

at

(35mV),

MICROPHONE high ( 2,5

).

track transfer ( 8

~

II

the signal source voltages

mV

np

~

D

),

D

~

mV

), RADIO

MICROPHONE

I_

5.3. Record Amplifier

Fig.

The record amplifier cards contain an equalization pre-

amplifier ( Q 501, Q 502

and a driver amplifier ( Q 504. 0 505

of about 25

regulator fully opened

( 1.077. 705 )

~D

CH

I

5.3-35

),

a VU-meter amplifier ( 503

the equalization pre-amplifier

mV

{ at 1

kHz

and nominal input signal, record

).

CH

is

II

a bus

D

).

At the input

vo~tage

level

),

of

Recording tion series-connected C 504 and trimpotentiometers P

P 502. Highs equalization can speeds;

is

equalized per NAB standard. Lows equaliza-

( 3180 µsec )

P 502

for

is

accomplished by feedback through

be

set

separately

7.5ips,

P501

for

3.75ips.

501

for

and

both

5.5. Record Relay

r

!

( 1.077.715)

Trimpot fiers are laid sistor Q 505 supplies the necessary collector d.c. for

Q 505 represents high impedance

the entire Modulation reserve with

ding feedback in the

( L 502 interfere

point of shorted by the record relay during playback. Amplification

p 504.

To protect the VU-meter indicators against

frequency interference

stage

5.4.

P 503

serves

out

for

modulation.

output

a resonant frequency

IC

with

and record

120 kHz ( L

is

decoupled

Oscillator

a.c.

is

514)

for

the

erase head 501

of

the VU-meter

for

voltage balance. The driver ampli-

high overmodulation stability. Tran-

for

AF

which furnishes

for

modulating the record

·better than of

emitter

pilot

carrier remainders which could

frequency. Between the decoupling

is

another tank

I C 517

),

resulting in misindication, the

RF

15

38 kHz

circuit

).

The decoupling

stage

with

C 508.

( 1.077.710)

dB. A tank

causes

current depen-

of

the driver

circuit

can

be

calibrated on

to

for

RF

I ( radio

Q 504

head.

circuit

stage

the bias point

11

Fl

Fig.

D

5.5-37

D

t

is

Purpose to curve sistor )

+~

of

the record relay

turn

on the oscillator " softly

of

the switching voltage, Q

is

delayed by

REL

601

2-5

3-6

R602

C602

with

an

electronic switch

".

To

601

an

RC

- network ( R 603, C 602

get

an

integral

( switching tran-

.-----.OV

osc.

R603

is

).

l

I

Fig.

5.4-36

The push-pull collector harmonics. interfering d.c. components can't arise. 120 kHz erase ration, load ( para 5.5. ) which proves advantageous frequency stability. Bias tely

Symmetry

is

high enough

frequency

is

current can for

CH

1 and

is

held constant by the compensation coil

be

circuit

guarantees

of

sinusoidal

to

prevent their interfering. The

symmetrically decoupled. In mono-ope-

set

with

trimpots

CH 2 as

well

as

waves

P 707 for

minimum is

assured

Erase

and bias

for

voltage and

to

P 710

both tape

odd and

of

separa-

speeds.

Fig.

5.5.-38

C 602 is close, bias voltage ration. When contacts 2/3, over R 602. The as during mono-operation. The compensation coil balances out Resistor R 604 corrects Q - factor

voltage

( exchange

5.6. Playback

is

discharged at the start and the

at

OV.

If

contacts 2/3,

head

compensation coil

dummy

inductive strays

load

jump

between monaural

of

erase

rises

for

Amplifier

5/6

of

with

the charge on C 602

5/6

has

two

the inactive half

of

the

erase

head

may require resetting

( 1.077.720)

LJd0fjl

0 I

base

of Q 601

record relay REL

open, C 602 discharges

winding halves acting

of

the

head.

and

assures

and

binaural operation

"n,

601

till

satu-

erase

head

minimum

).

n n

I

r

l

I

L

ro

~

I

Fig.

D D

5.6-39

~

0

~

~ ~

ID

CH

I

II

CH

I

Playback amplifier cards each contain one playback ( pre-)

amplifier and

is

d.c. coupled

back from goes over lizes its quiescent point.

1 µA which avoids magnetization

AF-components C 803. Its capacitive resistance becomes effective low frequencies ( less than 20 Hz) so

are fed back. Playback equalization

IEC ( CCIR

branch collector Q 802 I emitter Q 801. The RC-member

R 808

IC

µsec).

one

drive amplifier. The playback head

to

the

input stage ( Q

the

emitter

the

playback head

).

The equalization circuit

805 I takes care

of

the

voltage divider

The

feedback are shunted through

of

801

).

of

stage ! Q 802 )

to

base ( Q

feedback current

the

lows equalization ( 3180

801

of

the

playback head.

that

these frequencies

is

switchable

is

in

) and stabi-

is

the

D.c. feed-

less

than

at

very

NAB

feedback

The power amplifier cards have separate rectifiers and filters for each channel. separate windings ( 32 Vac ) for

The

entire amplifier ended push-pull cally free of d.c., in the diagonal

Q 905 and Q 906

C 907 and C 908. Q

amplifiers. Series connected D 901, R 911, D 902 are used

-

the

no-load current

independent back ( 100 % point

of

the

plification

output

of

temperature.

),

collector Q 906 emitter a 901, the zero

loudspeaker

is

set

by

The

power transformer has

the

power amplifiers.

is

d.c. coupled and works with a single-

stage. The loudspeaker

of

as

well as

901

of

the

electrolytic capacitors

and

Q 902 operate as voltage

the

output

By

strong d.c. depending feed·

output voltage ratio R 905

is

held constant. AF-am-

a bridge formed by

transistors constant,

is,

to

R 906.

two

practi-

keep

Basic time ing

7.5 ips

3.75 ips

At bias frequency and of

the and mode switch (channel selector) The drive amplifier fies headphones, power amplifiers. D.c. feedback,

Q 804 I base Q 803 stabilizes

three tiometers P 303, P 304 ( coupled ) in feedback branch emitter

In

STOP position, when put contact

5.7.

constants

the

partial resistors

NAB IEC NAB

the

pre-stage

bus voltage. The signal

after -tape

the

signal

as

stages. Balance regulation

of

equalization are obtained by short-

of

the

circuit. For :

( 50

µsec

) 3 - 4 · 5

( 70

µ.sec

)

I IEC

exit

switch, volume

to

the

well as for

( 90 µsec l

is

a 120 kHz tank circuit for

trimpot

is

P

801

for setting

is

conducted over

control,

to

the

drive amplifier.

three-stage d.c. coupled. It ampli-

level

of

the

terminals OUTPUT,

the

modulation

emitter

the

quiescent points

is

accomplished with poten-

0 805 I emitter Q 803.

the

pressure lever

of

the

playback pre-amplifier ( 13 )

S 5

(switch

Power Amplifier ( 1.077.850)

board 1.077.435

is

).

3 - 4

4 - 5

the

level

the

before-

and playback

of

the

plug-in

voltage divider

of

all

is

at

rest, out-

shorted through

5.8. Power Supply

( Diagram Tape Drive 1.077. 100, No. 1.077 .540)

( Removal, per 3.9.)

Both lines Switches disconnect tape core power transformer has five windings for following units :

Capstan and reel motors:

Relay control : Amplifier

Output Output

For

Service

MAURITRON

8 Cherry Tree

Oxon0X94QY

Tel:-01844-351694

Email:-

enquiries@maurilron.co.uk

of

the

).

In

addition there are

upon

supply:

amplifier : amplifier :

Manuals

TECHNICAL

Contact

SERVICES

Rd.

Chinnor

Fax:-01844-352554

power supply can be switched off ( Micro-

two

break-contacts which

removal

of

the

housing. The sectional

130 Vac (150 Vac) with 4 taps

22 Vac 24

32 Vac

32

(supply

Vac

(supply regulated)

(CH

Vac (CH

voltage voltage

1)

2)

27 21

Vdc) Vdc,

Fig.

5.7-40

C)

0

C)

Fig.

5.8-41

Power supply connectors. The electronically regulated voltage (and oscillator)

acts as a series regulator, whose conductivity

by Q 101. The zenerd iode D 104 provides a 12 V reference

for

the

Diode D 103

Q 101 from overload

amplifier section.

emitter

board

1.077.540 carries

is

adjusted

of

this latter transistor.

protects

at

the

base-emitter diode

in

case

of

the

output

amplifier

(21

V)

for amplifiers

P 106. The transistor Q 102

is

controlled

of

transistor

possible

short

circuit in

the

A

+

27

v

10

8

6

•

~

'

J

B

5.9. Drive

( 1.077.370, Diagram Tape Drive 1.077.100}

( Removal per 3.8. )

Fig.

5.9-42

The drive push

1.077.370. Remote

these have a minimum The

principle

for

better relay A is

closed. This corresponds

without

Control

buttons

control

contacts ( remote

of

relays,

of

their

understanding.

is

energized

current,

and

contact b 6/10

0

C)

operate

control

A119

contacts

their

control

is

In

the

contact a 8/12

to

+27V

r------

I

0 0

can

is

explained by an example

circuit

mode PLAY. Relay B

is

open.

11

a

0

on

control board

be paralleled

F3

to

locked by diodes.

of

fig.

( self-holding )

Rt

t t

4

~--+--+--

8

3

7

F 10

5.9

).

To

-43,

to

Fig.

If

Simultaneously relay B

self-holding by switch. The following table indicates which relays noids are energized

Table

I

•

I

To the about

must

the

is

R113 2 tO

...

6 c

RELC

PHOTO-ELECTRICAL

END-OF·TAPE SWITCH

5.9-43

button

< <

is

depressed, relay A

is

contact

the

STOP

5.9-44

STOP PLAY

>> <<

REC x

avoid loose

right-hand reel

0.3 sec ( winding reversal voltage 105 V

be

energized a

following circuit :

D120

b 6/10. Self-holding can be interrupted

button

or

by

for

corresponding functions.

A 8

x x

c

•

x

tape

loops

motor

short

period for this, accomplished by

0121

Ct

11

is

shorted and drops off.

energized and holds itself over

the

photoelectric end-of-tape

Record Relay

x x

at

record and playback starts,

receives elevated voltage for

ROLLER SOLENOID

0123

and

Roller Brake

Solenoid

x x

x

).

Relay C

BRAKE SOLENOID

sole-

I

..

1

I

r

f

-

I

1

..

Fig.

5.9-45

1

REL.A

If

the

instrument

current

5.9 hold over self-holding A charging

This energizes relay C

motor

interrupted by with increasing charge When switching back and capacitor C 111 discharges over and

and

-45

).

to

105

roller solenoids.

is

contacts

If

relay A

current

to

V over

contact a 12

in

the

STOP mode, relay A

a 12 and a

is

energized { PLAY mode

contact a 8/12.

capacitor C 111 flows over

and

contact c 5/9

on

to

STOP mode,

11

switches

).

The charging

C 111 and relay C drops off.

is

without

are

in

rest positi0n (

),

it will

Contact

( self-holding relay C

contact

the

a 7 /11 closes.

the

right-hand reel

current

a 7 /11 opens

windings

the

of

relay.

falls

brake

fig.

The

process on R 119 despite the gliding resistance change inertia). The trigger conditions light · dark, generate voltages To

is

check

must be disconnected from FH2 ( green ) on switch board ( fig. 3.8 pulled for this. The resistances are: light, less dark more (Don't it

is

heat sensitive ) .

is

accelerated by

(feedback),

at

collector Q 111: light, 1

the

than

solder

at

so

that

photoresistor, for light and dark values, it

20

kOhm.

the

soldering terminal

the

falling

emitter

a pulse-type transcient occurs

of R 155

V;

dark

the

circuit. Connections

-11

of

the

voltage

( sensitivity

the

following

about

22

FH1

) have

to

than

2 kOhm;

photoresistor,

V.

I

be

The following table summarizes modes.

Mode Rewind Motor

0

PLAY/REC

>> <<

Table

5.9-46

5.9.1.

The

working self-holding emitter end-of-tape switch ( Schmitt-trigger ) does depressing As

soon as light falls

drops

and

at

Q 111 drops

55-6=

49

21

99

Photoelectric End-of-Tape Switch

current

contacts,

path

of

the

STOP

base voltage

loop

the

switching transistor Q 112. Triggering

button.

on

and

cuts

motor

voltages

Motor Voltages in Vac

Winding Motor

0

42·6

Tel:·

of

the

STOP

photoelement

at

Q 111 rises. Collector voltage

off

Q 112.

0

36

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relays

button

R 155, its resistance

for

'

55

105

15

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is

closed over

and

the

same thing as

the

drive

0

42

Contact

SERVICES

the

collector·

the

5.10. Speed Regulation, Capstan Motor (

(Removal per

The

electronically regulated tape drive uses a is

why this technology rather detailed. Checks and electronics are done per 6.2.

_J

Fig.

5.10-48

method

3.9.)

unknown

of

00000

so far

in

regulation

adjustment

tape recording.

7.077.725)

of

REVOX A77

is

described here

of

the regulation

That

:::::

Fig.

5.9.-47

+27V

R155

Rl 16

0111

TO

RELAYS A,

SELF-HOLDING CONTACTS

BAND

FG1

FG2

0112

R119

C

The

capstan continously regulated. The driving element unpretentious outer

rotor

in

scant wow To measure cut

into

tively

counted transformed into a proportional frequency which yzed for ation

from

for

3.

75

changes

The

actually regulating network ( fig.

of

a bridge rectifier

is

loaded more

transistor with nearly a genuine resistance characteristic ( I V as

current

motor

speed

is

electronically measured and

asynchronous motor, whose homogeneous

generates a minimum

or

flutter.

the

speed, a 120-teeth high-precision gear

the

outside surface

by a special pick-up head. The speed

momentary

the

ips,

the

voltage applied

control element.

value in an electric circuit. Any devi-

nominal,

is

detected as

in

series with

or

less by a power transistor. A power

constant

of

1600

of

torque

pulses, reflected

the

rotor. They are induc·

Hz

for 7.5 ips

to

magnitude

to

the

motor.

5.10-49

the

supply, whose diagonal

base

current

is

a robust and

and

doesn't

),

for

is

then

is

anal·

800

Hz

sign, and

) consists

show

it

acts

130

CAPSTAN MOTOR

ov-

Fig.

5.10-49

Circuit 1.077.

( Q

201

with

power

signal amplifier amplifies, makes symmetrical

the

pick-up frequency discriminator. D.c. cent

points

sists

of

due

to characteristics mum

speed variation

The discriminator to

800

diode D requiring it also decouples

v

725

consists

to

Q 205

),

stage ( Q 206

dependent

of

the

amplifier stages. The discriminator

an

LC-series-resonance circuit

type

of

circuit

are

essential

frequency

Hz

by

switching in

201

is

polarized in conductive direction,

at

the

control

the

of

the

discriminator, and d.c. amplifier

to

supply

and

to

of

.2 % !

can capacitor

side

control

tachometer

to

Q 209

square wave pulses

feedback stabilizes

components

guarantee

be

signal amplifier

).

The

of

utmost

used. Best

the

required maxi-

changed from 1600

C 207.

but

one

low

current

line ideally.

v-

(150

3.5µF

tachometer

and

limits

to

the

quies·

con·

constancy

drift

In

addition,

thus

contact,

V-)

the

Hz

The

series

potentiometer

nant

frequency speed separately. rily

the voltage characteristic as a whole discriminator. d.c. amplifier

The

discriminator the

entire characteristic climatic

1596

Fig.

The signal, delivered

of

tegration ( C 210 & C

corrects stability. D.c. amplifier Q 206 · Q 207, whose operating

range

amplification

needed

stage Q 208 has little amplification. Power stage 0 209 consists

that power

chamber

I 1

Mt

I

1------------------....L-

7118

1--------~----------'--

-+----~-----.-----~---~-

15

5.10-51

a.c.

components

phase

is

shown

for

of

can

loss, generated during

slightly. This permits calibration of

The

circuit's inductivity. Fig. 5.10

is

given for clarification.

circuitry. Fig. 5.10

of

the

while

•5

error

in

of

40

power

a transistor which resists

occur

during

P

201

allows detuning

high speed

is

set

by

adjusting prima-

-50

function

The

operating range

is

temperature

-51

whole system, measured inside

motor

•2S

from

the

from

the

211

).

in

the

control

the

discriminator characteristic, has an

dB.

It

brings

amplifier Q 209.

cut·off

operation,

of

frequency

of

the

compensated

shows

the

typical thermal

was running.

discriminator,

tachometer

The

and

frequency

R 215 · C 209 member

circuit

the

is

and

signal

The

phase inversion

those

peak voltages

able

to

onto

the

to

conduct

the

reso-

the

shows

the

for

the

following

along with

the

-0,2%

T

1·c1

is

stripped

by

in·

improves

the

value

the

heat

sink.

r

.

"

I

[

•2

Fig.

5.10-50

Some

I[

Ht!

interesting system

1.

Steepness of

the

traverse within 3

meter

signal frequency. This means

ves fu

II

of

the

following amplifier cause

from

Hz

frequency deviation

or

no voltage

2. Line voltage variations

speed

of

the

3. Variations ± 10 %

deviation tionally regulated

of

speed

data

discriminator

0 Vac

for

order

of

in

by

).

:

and

amplification factor

the

motor

to

the

maximum value 130 Vac

at

the

that

a percentage deviation

of

20

% cause a deviation in

± .04

%.

operating voltage

±.1

% ( operating voltage

1600

the

21

motor

voltage

V, cause a

Hz

of

tacho·

recei·

±.1

is

addi-

to

%.

1

!

t

4. Changing motor Point 4 shows 50 The motors soft

speed

and

new

were

clutch.

the

supply frequency from

by

less

than

.05

that

the

supply can be alternated between

60

Hz

with absolutely no changes

motor

is

considerably lighter

to

date. It has neither flywheel mass

The

capstan axis

%.

is

rigidly fixed

50

than

to

60

Hz

in

circuitry.

synchronous

to

the

making interchanges very easy. The relatively low speeds

of

the

capstan

diameter

motor

capstan axis.

( 400 and

800

rpm ) provide a large

Notes

varies

nor

rotor,

a

For Service

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SERVICES

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6. ELECTRICAL ADJUSTMENTS AND MEASUREMENTS

Measurement Instruments and Aids

- Demagnetizing coil

- AF-millivolt meter or

-

AF

·generator

- Distortionfactor meter

- Oscilloscope

-

Wow

- Test Tapes ( Reference Tape)

or

and flutter meter

VTVM

digital counter

(vacuum tube voltmeter)

6.2.3. Tacho Adjustment with Cathode-Ray Oscilloscope If

need be, adjustments can be made with an oscilloscope referenced to the 50 ( diagram 1.077. 725 ) there

of

100

Hz

of the following shape :

Hz

network frequency test point D

is

( closed to

OV)

an a.c.

signal

Test tapes per ( 1966 ) and

tive speeds.

7.5 ips

3.75 ips

- Adjustment Tape 4 · track ( for height adjustment of the magnetic head on 4-track

instruments.

All

AF and RF measurements are

shielded cables.

6.1. Demagnetizing

- Magnetic heads and tape guides are before any measurement or adjustment with running

tape.

Strong d.c. · magnetization disimproves signal-to-noise ratio and frequency response. It can also permanently damage

NAB

( 1965

3.

75 ips ( 1967) are equalized alike for respec·

3180 µsec, (from

AGFA

3180 µsec, (from

AGFA or BASF) or

(

90

µsec).

).

50

µsec test tape

or

BASF) or

90

µsec test tape

.25"

and

the

DIN

Heimton 7.5 ips

DIN

45513 I 19 H

NAB

7.5

DIN

45513 I 9

NAB

3.75 ips

l

to

be taken with

to

be demagnetized

test tapes.

ips.

The superposed frequency comes from the regulating tem and is 1600 Hz for 7.5

3.75

ips.

Measurement

tape

in ding with respect to the base frequency frequency). (Adjustment procedure per 6.2.2.)

6.3. Playback Adjustment Preparation :

Check regulated supply voltage ( tions

to

Check

of

- Connect AF-generator

- Parallel the signal voltage on both inputs by bridging

the solder terminals of the alligator clamp.

is

accomplished

place. The superposed frequency must remain stan-

P 106 ( Power Supply Card 1.077 .540

Balance Adjustment :

ips,

in

to

AUX-input.

AUX

800 Hz respectively for

the

PLAY

mode with

(at

50 Hz network

21 V ).

cinch-connectors with

Apply correc-

sys-

).

I

I I I

I

6.2. Tape Speed (Regulator Card 7.077.725)

6.2.1. Pick · up Head • Adjustment

The air-gap between pick-up head and rotor shall

.4

mm

( .012" ·

50

mV

tachometer signal voltage

on connections blu

6.2.2. Tacho Adjustment Exact adjustment of

capstan motor speed, can be accomplished only with a

digital counter.

Connect digital counter Switch recorder

- For 7.5 Measurement time 10 sec. minimum. Apply corrections

to core of discriminator coil T 201.

- For

3.

75 ips, the frequency must

( 7.5 ips adjustment has

corrections

.016"

).

Adjustment

E2

and brn E 1 of the regulator card.

the

discriminator, respectively of

to

PLAY

ips,

the frequency must be 1600 to 1601

to

trimpot P 201.

is

correct when a 35 -

is

measured ( at

blu

E2,

brn E

( with tape

be made first ! ) · Apply

be

in

800

1. place

to

be

3.

75 ips)

).

801

.3 -

the

Hz.

Hz

Set controls per

fig.

6.3-52

I

ii

"""''"'

~- ~f

Fig.

6.3-52

- Supply about 30

- Measure signal voltages Both outputs shall have same signal voltages. Apply

correction with the balance control for voltage diffe· rences at fier channels

- Don't readjust the balance control

mV

I 1000

less

than 3

dB

if

the voltage differences are larger.

Hz.

at

the OUTPUT ( 2 V approx

at the outputs. Check the ampli-

..

r·

i 1 I

I

j

•

).

6.3.1. Azimuth Adjustment, Playback Head, Coarse

( Max. Level )

( Assembly and coarse adjustment

per 4.1.2. ) Check

- Mark polished face with grease pencil. Let

-

short Set

of

gap centering with respect

time.

The

gap

must

controls

per

fig. 6.3

-53.

be

in

center

It

after

head exchange

to

polished face :

of

worn area.

I

RECORD

tape

run

It

I

- Switch ( sharp ) with screw

Secure screw C with a

6.3.3. Playback Level from Test Tape

-

Set

to

PLAY and set

C.

controls per fig. 6.3

drop

-56.

output

of

voltage

lacquer.

It

MONITOR

I

to

a maximum

REC~O

It

I

Fig.

6.3-53

- Load 7.5"

portion

-

Connect

- Switch

with screw C

( 10 kHz

AF-millivoltmeter

to

test

PLAY

(fig.

tape

and advance

).

and

6.3

@-@s

...

to

an OUTPUT terminal.

set

output

-54

voltage

).

azimuth

to

adjustment

a maximum

~(ill)

w·@-

...,

Fig.

6.3-56

- AF-millivoltmeter remains connected

( 3 V range

- Advance test tape

Set

playback mode switch

- Set

output

(fig. 6.3

).

to

voltage 2 V with

-57).

level portion.

to

trimpot

---

'"'

''·

"'·0

~o

•

0

Fig.

6.3-57

QNODUCl~•

•

0

lllllJ!TER

'""

...

....

0

to

CH

1.

REPR LEVEL

..

o

...

·~o

··O

--

=-0

''0

one

output

--

c":~o

-

~o

=O

=-0

CH1

..

,~o

Fig.

6.3-54

6.3.2.

-

Fig.

-

It

ment errors larger

Azimuth

Set

controls

6.3-55

is

absolutely essential

per 6.3.1. before using this

Adjustment, Playback Mead, Fine

( Phase Method )

per

fig.

6.3-55.

For

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I~

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@J-

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method

Contact

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enquiries@mauritron.co.uk

to

accomplish

..

cOOD

It

@"

...

coarse adjust·

to

avoid phase

I

- Set playback mode switch

- Set

output

voltage 2 V with

6.3.4. Frequency Characteristic, Playback

(from

Test

Tape)

-

Set

controls

per fig.

to

6.3.-58.

CH

2.

trimpot

I

REPR LEVEL

ti

""'"'""

@J@J

Fig.

6.3-58

Advance band.

- AF-millivoltmeter, range 300 mV ( -20

Both channels can be measured simultaneously by chang· ing back CH

2).

to

frequency run portion

or

forth between each frequency section (

of

DIN

dB

).

or

NAB

CH

2.

It

test

1 I

i

6.4. Oscillator and RF - Adjustments

6.4.1. RF - Voltages and Frequency Checking

~~··Jll.Jf

··O

~JI-II'

'"'

3~0

r

s.

..

Set controls per fig. 6.4

Fig.

6.4-59

Load tape and switch

A. - Measure erase head voltage against ground with

at

VU-meter board (fig. 6.4

blue HB6 (CH 1

Track

2 -

4 -

B.

- Load tape, switch

Track

blu

org

Fig.

6.4-60

Oscillator Frequency

lamp

at tape. Oscillator frequency oscilloscope. The frequency is

measured

against ground. ( Oscilloscope: 12 oscillations per 100

µsec

).

21

16 Vac each

HB6

HB3

optical end-of-tape switch

at

orange HB3 and blue HB6 (fig. 6.4

-59

It

I

to

RECORD

Vac each

I

-

I

-

I

-

I

-

I

-

I

-

I

-60)

6

3

(STEREO).

orange

HB3

D

LJI

to

RECORD { STEREO

if

measuring without

is

measured with digital counter

is

120 kHz ( ± 5

Rt:CORO

(CH

).

!Or

Pull

kHz)

If

VTVM

2)

and

out

or

and

-60)

I

··o

~o

0

itf:"U!VU

AIMOOllet

·~·

0

Fig.

6.4-61

- Depress record pre-selector Connect oscilloscope or digital counter

- Correct

- Repeat adjustment procedure until any remaining frequency deviations are symmetrical around frequency ( e.g.

6.4.3. RF - Traps, Record

- Set controls per

DUMMY

MON!lOR

0

LOAD

CH

1 + 1 kHz,

fig.

6.4

=O

if necessary.

-62

··o

··O

'"'

"'0

CH

2 and disengage

I

ti

CH

2 - 1 kHz

1 l l

lllOOllO~•

:nO

,

...

--··

to

RtCORO

=O

...

....

CH

orange HB3.

the

nominal

).

''0

0

If

It

@Y@J

Fig.

6.4-62

Load tape, switch

- Connect

record amplifier ( fig. 6.4

705.

VTVM

to

MlN

to

RECORD ( STEREO

test

point

C 515

-63

),

see also diagram 1.077.

of

).

the

Mlfrf

respective

1.

i

I

it

.,

J.

""

-

I

6.4.2. Dummy Load

The dummy load compensation

erase head

erase head during MONO operation

- Load tape, switch

- Connect digital ( fig.

- Measure RF-frequency in stereo mode.

- Disengage record pre-selector LOAD till same frequency

is

replaced (balance of inductive strays from

to

RECORD.

counter

6.4

-60

).

is

or

oscilloscope

CH

is

reached as

needed only when the

).

2 and balance

to

blue H

DUMMY

in

stereo mode.

the

86

Fig.

6.4.-63

Record Amplifier

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SERVICES

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Set

minimum voltage

Less

than < 300

at

BIAS TRAP

mV ( fig. 6.4

CH

-64

).

··O

·~o

1 and

CH

2:

~;11,W'l".

'"'

.,.o

l!QW.l.11

··O

-

Set

AF-generator

- Load tape and switch

- Adjust for maximum signal with screw B (fig. 6.5

( turn slowly - indication delay !

to

10 kHz ( see 6.5. preparations).

to

RECORD.

).

-67

),

0

.....

,

...

...__

L__

• •

Fig.

6.4.4. RF - Traps, Playback

- Under same conditions

Playback

6.4-64

OUTPUT terminals of

playback amplifier

< 50 mV ( fig.

6.5. Record · Adjustments

Preparations :

Following measurements ( 6.5.1.

with a record level

(To

avoid over-modulating high frequencies).

-

Set

controls

----1

CH

6.4-64

of

-

per fig. 6.5

to

20

-65.

__

as

6.4.3. but,

1 and

CH

a voltage minimum : Less

).

to

dB below full modulation level.

.-o

-

'""

--·

Record

__

__,

connect

2 and set BIAS TRAP

6.5.6. ) are

VTVM

to

be

than

taken

to

Fig.

6.5-67

6.5.2. RF - Bias Since

the

high frequency playback voltage

in

a curve with distinct maximum, a relationship which can be used The measurement Controls OSCILLATOR

( fashion until maximum AF back mode switch by choice

fig

to

6.5

determine

-68

) are

the

operating point (fig. 6.5

is

per 6.5.1. ( 10 kHz,

CH

1 and

turned

from

the

output

CH

1 I

MCOlm Alillll'lP.

,

..

is

bias dependent

-20

CH

2, 3.75 and 7.5

left limit

voltage

is

CH 2 ).

.,.

-69

dB).

in

clockwise

reached (play-

).

......

....

c~:.~o

It

I

MONITOR

-~

Fig.

6.5-65

- Connect AF-millivoltmeter

- 300 mV range

- Adjust AF-generator ( 3 - 4 mV ) 200 back

6.5.1. Azimuth Adjustment, Record Head, Coarse

-

Set

controls

...

mV

from

@

at

the

OUTPUT terminal (voltage as for play-

test

tape

per 6.3.3,

per fig. 6.5

-66.

~s

to

OUTPUT terminal.

but

I~

...

~.@

(~Y

RfCORO

at

1000

Hz

20

dB lower

I I

AEC°"O

It

I

~y

0

-·

0 0

Fig.

to

obtain

).

Note turning in by

V(AFI

10 kHz

Jl

~y

-""'"

~~

6.5-68

the

pointer deflection

the

amount ( ;::.,,

0

....

same sense till

V ) shown

max

'"·0

~.o

=O =O

at

the

AF-output

in

the

•••

,,.

'"'

=O

·~·

maximum

voltage has dropped

following table.

and

~lo

U<a

"'""0

.

..

~

continue

0

Fig.

6.5-66

Fig.

6.5-69

Type

of

Tape

AGFA

PE

31

REVOX REVOX REVOX

AGFA

BASF

SCOTCH SCOTCH

Table

6.5.3. Azimuth Adjustment, Record Head, Fine

Set controls per fig.

Fig.

- The balance regulator

- Set

-

- Control possibility :

- Secure setscrew with a

PE 207

601

PE

36

PES

35

202/203

150/215

6.5-69

""''"""

6.5-70

preparations). Other

conditions as

- 20

dB).

output

(fig.

6.5

-67)

It

is

absolutely essential

ment per 6.5.1. before using this method

errors larger

Pass through lower frequencies with sound generator.

Output

voltage shall remain constant.

36

RX

(LH)

voltage

than

6V

· 3.75

ips

!:N

· 7.5 ips

3dB

4dB

5

dB

It

I I

6.5

4dB

5

dB

5dB

-70

~y

must

be

set

accurately ( per 6.3,

up

to

now ( Record, Stereo, 10 kHz,

to

a maximum ( sharp ) with screw B

turn

slowly • indication delay !

to

90°.

accomplish

drop

of

the

lacquer.

LiV-15

2dB

Rf:COM>

~J

).

coarse adjust-

to

avoid phase

ips

I

Tel:-01844-351694

JI

....

- Load tape, switch

- Before-and-after-tape switch from AF-generator, set generator level such PUT terminal voltage

- Switch

For

Service

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...

to

NAB

6.5-72)

back mode switch

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to

Manuals

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~---.···

0 0

Fig.

6.5-72

6.5.5. Record Equalization

- Switch AF-generator

-

Set

controls per fig.

to

RECORD

is

200

and adjust REC LEVEL

obtain

200

mV

at

to

CH 1 or

Contact

SERVICES

:fu

CH

•

0

=O =O

at

same voltage

6.5-71

(NAB)

--·

c~:,.

•••

MC

0

Llvft

0 0

...

l!ltll'lllOl:IUCt •

...._.IC•

0

Fig.

6.5-73

- Adjust

output

EQUALIZ. ( 0 back mode switch speeds.

'"'

voltage from 0 dB = 200

=O

0

=O

CH 1 both

mV I

(Stereo).

to

INP. Supply

mV.

OUTPUT terminal, play· >

2 respectively. i

"o

"'

"·0

...

o

··O

(-20 .

1000

that

trimpots

=O

dB)

to

Hz

OUT-

(fig.

~~e,o.o-

..

··O

IOUAUZ

"·0

~~l·

.....

0

......

12 kHz.

......,_,,.

,

..

··O

··•

··O

"·•

·~O

---·

··O

=O

to

+ 1 dB with trimpots

1000

Hz

per

speeds, likewise

~~o

=O =O

6.5.4

). Play-

CH 2 both

_1

j I

.

(

'

I

r

6.5.4. Record

- Set controls per fig.

level

6.5

-71.

I~

I

MCOAI)

it

@-@-

MA>

Fig.

6.5-71

- Playback level ( per 6.3.3. ) and balance adjustment ( per

6.3. preparations) must be set.

- AF-generator

- AF-millivoltmeter mV.

to

AUX-input

to

(connect

one

OUTPUT terminal, range

in

parallel).

300

6.5.6. Frequency Characteristic via Tape

-

Set

controls per fig.

- Calibrate AF-millivoltmeter { change slightly voltage till 0

- Measure frequency characteristics

I

( by changing playback function switch both

channels can be measured,

6.6. Distortion Factor Measurements

VU-Meter Calibration Noise Measurement Erase

Attenuation

Crosstalk Attenuation

6.6.1. Distortion Factor

-

Set

controls per fig. 6.6

6.5

-71

(NAB).

dB

or

even-numbered indication

(via

Tape),

-74.

the

is

reached).

7.5

ips and

one

after

VU-Meter Calibration

CH

the

1 I

other

3.75 CH

signal

ips

2,

).

1

l

i

Effective values (weighted,

external voltages can be seen for the

the followin!I table:

CCI

F filter) of the noise and

REVOX

601 tape

in

Fig.

6.6-74

AF-generator ( 500 respect

- Connect distortion factor meter to

- Load tape, switch Measure distortion factor (CH 1 and

- Set input the worse channel

- Repeat procedure with 3.75 be 3

to

previous setting ( input voltage about 40

level

%.

tn case of higher values, reduce input

3 % distortion factor

- Distortion factor control

after-tape switch to I maximum!

- Switch back

- Adjust METER CALIB ( CH

1 and

to

CH

Hz

).

Switch 20

to

RECORD (Stereo) 7.5

so

that

the distortion factor

at

7.5

ips.

is

achieved.

"Before-tape":

NP.

Distortion factor shall

NAB

lower input

fig.

6.6

2, VU-meter indication 0

dB

higher with

mV)

an

OUTPUT terminal.

ips.

CH 2 ).

is

2 % on

Distortion factor may

level

till

Set before-and

be

1 %

level

by 6 dB.

-75)

with trimpots

dB

( 100 %

2 Track

7.5 ips

Noise Voltage

Ext. Voltage

Table

6.6-77

If

these noise and external voltage separations are not attained, the tape guide elements and magnetic heads are, once more,

6.6.3. Noise Voltage, External

(

Check)

- Switch recorder to STOP.

- Before-and-after-tape switch to

).

>66dB >58dB

to

be demagnetized carefully.

3.75 ips

>63dB >57dB

Voltage"

!NP

4 Track

7.5

ips

3.75

ips

>

62dB

>56dB > 54dB

Before-Tape"

( fig. 6.6

59dB

-78

).

..

c.

0

'""

.......

~

....

=O

Fig6.6-75

6.6.2.

Moise

Voltage ( and External Voltage )

Noise voltage measurements refer to full-modulation (dis-

tortion factor 2 % at 7.5 ips, 3 % at 3.75 ips resp. per

6.6.1.)

- To avoid RF-interference errors, a tape erased on the recorder

is

measured

in

the

PLAYBACK

mode.

via

Tape

It

MOf'«tTOflt

I

C"'

CH•

@_@)

Fig.

6.6-78

The noise and external voltage separation shall than 75 dB, referred to full-modulation.

Check of Input Amplifier :

Set controls per

- To avoid hum interference during this procedure, the microphone inputs ( jacks or cinch connectors ) are to

be

terminated with 200 ohm.

_,

""'""°

@S@S

MIN Mlllf

fig.

6.6 - 79

be

It

more

I

Fig.

6.6-76

Fig.

6.6-79

The noise and external voltage separations shal I than

45

dB

referred

to

full-modulation.

be

more

6.6.4. Erase

Following Measurements: Erase and stereo ( VTVM ( band

Attenuation

6.6.4

- 6.6.6. I can be taken with a selective

width

less

than

attenuation,

100

Hz

).

crosstalk,

mono

Set

playback function switch talk separation 1 - 2 and bring with crosstalk compensation

trimmer ( fig. 6.6

60

dB

I.

-83

to

CH

2, measure

)

to

best value ( more than

the

cross-

r

;

•

To measure erase Hz

is

recorded

ning

on

the

-

Set

controls

- Record

1000

attenuation,

and

consecutively erased.

tape

is

then

measured.

per fig. 6.6

Hz, full-modulation.

a frequency

-80

"""''"'"

Fig.

6.6-80

- STOP, rewind tape.

- Close record volume controls (fig.

For

Sa!Vice

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6.6-81

8

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SERVICES

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of

about

1000

The

record remai-

It

I

6.6-81

).

I J l

I I I :

"''"'""

@-@-·

w•

Fig.

6.6-83

Advance

-

Set

talk separation 2 - 1,

For strong corrections, repeat crosstalk 1 - 2 measurement

and adjust for mean value.

6.6.6. Crosstalk, Stereo Measure and if necessary adjust

per

6.6.5. before checking

Don't following measurements.

-

The while measuring stereo crosstalk attenuation. Close input

-

Set

tape

to

recording on channel 2.

playback function switch

correct P 305

the

stereo crosstalk attenuation.

disturb P

generator

to

controls per fig. 6.6

the

305

is

switched

channel

compensation

in

to

be measured.

-84.

to

CH

1, measure cross-

if necessary.

( selective 6.6.4. )

mono

crosstalk

trimmer

parallel on

attenuation

during

the

AUX-inputs

the

r

t

- Switch recorder nuation.

The remainders under

the

level

6.6.5. Crosstalk, Mono

A mono-recording

taken 1 min on

measurement on

the

unused channel

Set

controls

Fig.

6.6-82

to

on

the

of

full-modulation.

1000

CH 1 and

on

a factory-tape. Note

per

fig.

Record and measure

tape

shall be

( selective per 6.6.4. I

Hz

full modulation

afterwards 1 min on

is

disengaged.

6.6

-82.

It

I

better

that

the

erase atte-

than

75

is

appropriately

CH

2 for this

the

record

dB

butt

Fig.

6.6-84

- AF-generator

Measurement 1 - 2 :

AF frequency millivoltmeter volume control volume control

r.lleasurement 2 - 1 :

- AF frequency millivoltmeter at volume control volume control

- Crosstalk attenuation shall be

1000

Hz, full modulation, record stereo.

CH

1 fully open (

CH

2 fully closed

CH

2 fully open (

CH

1 fully closed ( left limit

--

better

It

I I

"'c"""

@f@f

MIN

at

1-11

output at

right limit

(left

output

at

right

than

limit).

CH

limit),

45

dB.

- 11·1

2, record

),

record

1, record

record

).

JI

MM

r

l

t

6.7.

-

Set

Fig.

Output

controls

6.7-85

Voltage Check

per

fig.

6. 7 -85

Load tape, switch

to

Record

(Stereo).

- AF-generator 500 Hz, full modulation.

- AF frequency millivoltmeter Output

voltage shall remain

before and-after-tape switch I back mode switch STEREO I switched around. the

indicated tolerance, proceed per 6.5.4.

6.8. Wow and

The

values given in

wow

and

flutter

by a

different

If

the

Flutter

the

meter

standard

output

technical data are measured with a

per

can't

at

output

constant!

NP I NAB

voltage

CH

± 1

I I

1 I

doesn't

Std DIN 45507. Values

be compared.

CH

dB

EC

and

CH

2 I MONO

1

or

CH

),

when

the

play-

stay within

obtained

2.

is

For Service

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8

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Tet-

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SERVICES

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enquiries@maurilron.co.uk

7.

ACCESSORIES

7.

1. Remote Control

All

push

button MOTE shielding and its length The remote control unit circuitry

CONTROL. The remote control cable needs no

<<

I

functions can be accomplished by

is

not critical.

PLAY

STOP

I

I .

I

,.i.

;;

~

I

•:

•

!Xi Ot 0

L

__

..

li

a

*"'

~

• E i

..

...

-

RE-

is

per

fig.

7.1-86.

I

Amk:ht

auf

Stitcket

I

LOtteiw

ye!

4

-

>

I

_

..

__

J

REMOTE CONTROL PLUG (HIRSCHMANN

Fig.

7.t-86

The 27 Vdc on terminal 7

(load 150 mA maximum).

The dummy connector must be inserted for operation with· out

the

REMOTE CONTROL unit (this dummy connector

shorts terminals 1 & 2).

7.2. The timing device

in

REVOX A77 during predetermined intervals only. For operation with a timing clock, selector remains continuously tape speed.

Operation with a Timing Clock

is

to

a manner which will provide electric current to the

is

for use with slide projectors

be wired into

the

in

the position of the desired

power switch and speed

WIST

10)

the

electric power feed

1

I

I·

l

T

8. MODIFICATIONS

8.1.

Rewind

For bad rewind with 18 cm (

7")

reels:

Replace resistor R 125 ( 820 Ohm ) by resistor 1.2 kOhm,

9 Watt (drive control 1.077.370

).

8.2. Switch Noise The following change can improve

operation of the STOP button

the

situation where

out

of

RECORD and PLAY

modes causes clicks : Ground connection brn (

the printed side and resoldered

at

playback switch S5 ( switch board 1.077.435

fig.

3. 13

-18)

is

unsoldered from

to

the ground conductor

).

Another improvement results from replacing the diode D 601 ( record relay card ) by an RC-network: C = 50 µF I 30

V,

R

100

Ohm I 1

polarity

8.3.

).

RFI

Interference from strong radio an

removed by

Solder 1500 ·

the

following measures :

5000

connection shield ( shielded cable )

/8

W ( series connected, observe

TV

transmitters can be

pF ceramic capacitors from ground

to

chassis ( tubular

rivet of connector fasteninQ ) at the disturbed inputs ( see

example C 154 OUTPUT terminal).

Powerful UHF television transmitters may the playback head cables. If an interfering buzz occurs, following change shou

Id

be

effected

be

picked up by

in

the playback

the

amplifier:

Connect a capacitor of 100 pF (maximum 220 pF) from base

to

emitter of Q

803

(similar

to

C 803 on Q 801

8.4. Transfer Play Sensitivity Resistor R

lot

1.

sensitivity (gain

316

and R 321 are 10 kOhm

in

recorders

of

Substitution with 3.3 kOhm resistors ups recording

10

dB

approx).

8.6.

Capstan Motor with Sleeve Bearings Modification effective from serial Nr. S 60483 and G 78003

for illustration see parksl ist page E 10.

The capstan shaft extends through the full length of the motor and

The lower bearing

ment of the shaft by means (low-friction) washer. life and

is

supported by two sintered-bronze bearings.

is

designed

All

will

normaly not require any service.

to

restrict the axial

of

a plastic coated thrust

bearings are lubricated for their

Capstan shaft and low-friction washer may be replaced the

field.

If

a bronze bearing has become defective,

be sent

to

the

nearest factory service-center. (For disas·

sembly instructions see section 3.7.)

8.6.1.

Removal

of

Capstan Shaft and low-friction Thrust Washer

Removal of capstan shaft and low-friction washer

while the motor remains installed in

the

recorder.

Carefully remove shaft lock A by pulling it sideways with a pair attend

of

angled pliers. DANGER!

to

pry the lock loose with a screw-driver etc.

because it will fly off quite forcefully. Slide off the

rotor portion

of

the

capstan motor.

After removal of the tape quide between the back head and the capstan shaft, pulled up and

out

of the motor. (Take care not

the

disturb the setting of the adjusting quide.)

).

To remove the low-friction washer take out the circlip B with parts can now be disassembled order: Springwasher thrust bearing

the

aid of special pliers.

E,

low-friction washer F and

G.

in

The capstan shaft may now be removed by pulling it downwards and

out

of the motor.

When re-assembling the lower bearing, apply one drop of lsoflex PDP65 oil

to

the low-friction washer.

When handling shaft and bearing, extreme care must be exercised, dust particles from entering

so

as

to

avoid damaging them and

the

precision bearings. (runout

accuracy 1/1000 mm).

the

motor must

is

possible

Do

shaft can be

nut

on the tape

The

bearing

the following

to

prevent any

move-

in

not

play-

to

8.5. Replacement

Starting with Serial Nos. Capstan-Motor was installed which operates

of

Capstan Motor

$15500

and G16150 a new

on a 20

type

of

V higher supply voltage and therefore requires a modified power-transformer. The voltage appearing

(speed control board 2.077.725} now measures 150

at

point

ES

blu

V.

For

Service

MAURITRON

8 Cherry

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SERVICES

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01844-352554

9. TROUBLE

Pre·

Check:

r

J

SHOOTING

Check network voltage.

9.1. Faults

Capstan Motor fails

in

the

Drive

to

run :

Allowable deviation ( also for short periods ) settings

110

130 150 220

240 250

Use ators have a marked leakage field

Check or replace diode D 104,

Check Check regulation electronics, test points ( diagram 1.077.

725

If

stopping, the regulator pre-amplifier

A 206 ( 100

of

the

voltage selector :

Vac: Vac: Vac: Vac: Vac: Vac:

a regulator

).

the capstan

min min min 130 Vac, max min 190 Vac,

min

min 225

if

of

regulated supply voltage

motor

capacitor C 151.

motor

Ohm)

96

Vac, max

112 Vac,

210 Vac, max

Vac,

the deviations are higher. Note

if

necessary.

does

not

against

330

125 Vac

max 145

165

max

245 270 Vac

max

290 Vac

(keep

21

Vdc. Adjust on P 106

start by itself after manual I

is

oscillating. Exchange

Ohm.

at

respective

Vac Vac Vac

that

regul·

far from recorder).

l I

Capstan

Capstan motor whistles :

motor

rumbles :

Check capstan bearings, exchange ball bearings against fac· I

tory

new original ones.

I

Exchange bearings against factory - new original ones.

Check gap rubber

surface for vibration isolation.

Unpotted pick-ups are

rotor

to

pick-up ( per 6.2.1

or

equivalent between pick-up and its mounting

to

be exchanged for potted ones.

}.

Put a strip

of

Tape Speed

too

low :

Check pick-up separation. Measure pick-up frequency ( per

6.2.2

}.

Check regulation electronics, test points.

Wow

and

Flutter:

Mechanical causes :

Periodic wow and flutter whose origm

is

in

a defective pressure roller or whipping capstan axis can be recognized by observing the rotating element's rythm ( pressure roller

or capstan axis might be marked with felt tip

pen).

Pressure

roller, see also 4.4.1. If

rythm

of

wow

is

identical with the rotation of the left-

hand reel motor, the origin may be either mechanical or

electrical. The mechanical cause may be defective bearing or misadjusted brake.

Electrical causes:

Overly strong counter torque of left-hand

be cause for wow; check motor voltages, see table 5.9

If

wow occurs only

large a distance of pick-up or

6.2.1

).

Wow

at

both speeds may

in

the RC-network R 215/

at

3.75

ips,

it may have its origin

in

the regulation circuit,

be

caused by a defective capacitor

.C209

in

reel

motor can

the

regulation circuit.

-46.

in

too (see

Replace capacitor.

Inadequate Starting Behavior, Slow Rewind :

For

Service

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Push Buttons

Don't

Hold :

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8

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SERVICES

Chinner

Reels smaller than if

at

all

possible.

60

mm

( 2 - 3/8" ) should not be used

Optimum behavior can be expected only at nominal line

voltage.

Check reel motors with loosened brakes for light run (axial play

of

reel motors .2

Increase R 125

Dummy connector REMOTE CONTROL End-of-tape switch

to

to 1 or

.3 mm ( .008

1.2 kOhm.

to

.OJ2"

is

defectife, see 5.9.1, or strong light

).

missing.

incident on photoresistor.

Check relay operating voltage ( 27 Vdc

).

is

End-of-Tape Switch Doesn't Function :

Lamp defective. Check photoresistor and trigger, see 5.9.1.

Pressure Solenoid Doesn't Function :

I

rl

1 I

Check drive control, relay contacts, and diode.

Brake Solenoid Doesn't

Brakes ( STOP )

too

weak,

Function

too

strong, irregular :

:

Check solenoid coil. Clean core. Check relay operating voltage ( 27 Vdc ).

..

Check brake bands, check brake lining. Clean and Measure brake tension per 4.3.

degrease.

f

i

..

l

I

For

Service

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8

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Manuals

TECHNICAL

Cherry

Tree

Oxon

OX94QY

enquirlas@mawilron.co.uk

Contact

SERVICES

Rd,

Chinnor

Fax:-

01844-352554

I

T

l

I

r

9.2.

Faults

in

Circuitry

Pre-Check:

Playback Amplifier Hums :

Playback Amplifier Noisy ( Drive Amplifier )

See Pre-Check

Break

in

9.

playback head windings.

Flap shield doesn't close adequately. Supply voltage

Capstan motor leakage field 1 00 V

eff

max.

21

Vdc, hum voltage too high.

too

high, check supply voltage,

Possibly strong interference from UHF·TVtransmitters, see. 8.3.

Line voltage

too

low, see 9 ( pre-check

).

with closed volume control :

Defective transistor Q

Amplification

803

or

Q 804.

too

high from defective balance potentio·

meter. Noisy zener-diode Inadequate matching to following amplifier. Open

LUME

control completely, adjust volume

in

power supply, replace with planar type.

in

amplifier.

VO-

Playback Amplifier Noisy :

Recording Noisy :

with open volume control :

Condition: Function PLAY; without tape in place (optical

end-of-tape switch: Cover light I; before-and-after-tape switch position

NAB

I I

EC.

Defective transistor Q 801 or Q 802.

Check tantalum capacitors.

with closed record volume control :

Check playback amplifier. Clean and demagnetize magnetic heads.

Procedure with pulled record amplifier, once fault

is

correc-

ted, record amplifier found defective :

Replace transistor Q 501

or

Q 502.

Check C 515 for leakage current, check tantalum capacitors.

If

fault persists with pulred record amplifier :

Defective oscillator

or

erase head replace.

with open record volume control :

If

noise occurs only with open record volume control, check

input amplifier.

Check Q 401 I Check tantalum capacitors.

421

and Q 402 I 422.

r

i

Highs Playback

No

Record:

Inadequate Erase:

Weak

or

Variable :

MAURITRON

Tel:·

For

Service

Manuals

TECHNICAL

8

Cherry

Tree

Rd,

OxonOX940Y

01844-351694

Email:·

Fax:·

enquiries@mauritron.co.uk

Contact

SERVICES

Chinnor

01844-352554

Dirty magnetic heads.

Tape

is

not

of type pre-scribed by manufacturer.

Wrong bias ( record equalization

Playback head misadjusted, see 6.3.1.

Record head misadjusted,

Worn magnetic heads.

Check relays. Check relay Q 601.

Replace oscillator.

Dirty erase head. Measure RF-voltage;

at

oscillator. Defective erase head. Tape extremely over·modulated.

if

it

),

see 6.5.2.

see

6.5.1.

is

too

low, check supply voltage

to

6.6.

r

I

VU-Meter, None

Switching Clicks :

RFI ( Radio Frequency Interference):

Transfer Play Sensitivity

or

Faulty Indication :

Too

Low:

Defective VU·meter.

Calibration misadjusted, P 504. Defective rectifier D 351 - D 354 ( VU·meter board 1.077.

480). Defective amplifier, Q 503 (record amplifier card 1.077. 705)

see Modifications 8.2.

see Modifications 8.3.

see Modifications 8.4.

[

~

T

REVox

TECHNICAL DETAILS

Tape

transport

Tape speeds : Wow

and

{weighted) Tape

slip:

Tape

spool

Operating position :

flutter

diameter

:

A77

Measured with REVOX

3 -

motor

Electronic speed change .

3 3/4

max. ± .08 % max.±

less max. Horizontal

deck. Electronically governed capstan-motor.

and

7 1 /2 ips.

at

.1

%at

than

.2

%

10.5"

or

7 1 /2 ips.

3

3/4

ips.

vertical

601

±

DIAGRAMS

tape

.2%

Amplifiers :

Frequency

Distortion via tape,

peak level

Equalization :

Signal weighted as

Cross

Oscillator

Inputs

Outputs

Remote

Output Output

(8S1

Output

response via

and

at

to

noise ratio, via tape,

per

ASA A

talk

at

1 kHz :

frequency

per

channel : Cinch I Jack

per channel : Cinch

control :

amplifiers :

power :

load)

impedance :

tape

:

at

1 kHz

0 VU respectively

:

5 -pole DIN

Cinch

5-

pole DIN

Jack

Equipped

circuit cards

30

50

30

50 7 1

3 3/4 ips: max. 3 %

Record:

Playback: 7 1/2 ips: min. 66 dB

3

Mono

120 kHz, push pull oscillator

Microphone, switchable LO/HI LOW: HIGH: RADIO: 33

AUX: OUTPUT max. 2.5 V I

RADIO max. 1.2

PHONES 200 600 n

Fully electric for all operating functions

Plug - in optional Music power

( 8 W per channel ) Distortion

with

Hz

20 kHz

Hz

15 kHz

Hz

- 16 kHz

Hz

- 10 kHz

/2

ips: max. 2 %

NAB NAB

3/4

ips: min. 63 dB ( 4

better

than

50-60011

up

to

kn

1Mn

20

silicon transistors

+ 2

± 1.5

+

± 1.5 dB

or

0.6

or

1.0 % resp.

and IEC

(4

60 dB, stereo

100

kn

VI

throughout.

/-

3 dB }

dE\

21-·3

dB

% resp.

(switchable)

track min. 62 track

min. 59

better

.15mV

2.5 mV

2.5

mV

35 mV

Rs

600

Rs

2.5

W ( 10 W per channel )

better

n

kS1

than

4-16!1

Plug·in

at

}

dB) dB)

than

Continuous

1 %

printed

7

112

ips.

3 3/4 ips.

45 dB

power 16 W

Built -

in

portable

consumption

reserve

loudspeakers :

model )

the

(

Transistors, etc.

Power supply : Mains voltages :

Power

Mains fuses :

Weight:

We

:

right

to

make technical alterations

Two loudspeakers

a plug

is

inserted into

per

channel ( automatically disconnected

the

DIN loudspeaker

54 transistors, 32 diodes, 4 silicon rectifiers,

1

photo

resistor, 4 relays

Electronically stabilized

110, 130, 150, 220, 240, 250

Without

output

With

output

220 250

110 -

Approx. 34 lbs.

in

amplifiers 70 W

amplifiers

V-

I .5 A

150V-/

the

interests

1 A

of

V-/

50

· 60 Hz

approx.

70 100 W

technical improvements.

when

sockets)

INDEX

QTY

PART

NAME

ORDER

NUMBER

A

01 02 03

04 05 06 07 08 09

10 11

Chassis

1

1 Frame,

1

Chassis,

Frame,

Chassis, Panel, shield 1.077.114

tape drive left right

switch board

1.077.100

1.077.100. 02

1.077. 100 . 03

1.077.430.

1 Rail, terminal 1.077.550.

16

4

4 8 Screw, sheet metal

2

Snapnut Screw, sheet metal Washer 1.010.008. 23

22. 16.2021

20. 21.7312

20. 21.7308

Bracket, double angle

1.077.100.

01

18

Plastic Cover, Knobs

1

2

Cover, drive

Cover, drive,

Panel,

front,

Panel,

front,

Panel,

front,

Lid, assembled

Lid,

for

MK

Spring,

lid

1 Cover, head

4 4

Knob, rotary, gray

Skirt,

knob,

Skirt,

knob,

for

MK

with

lid

VU-port

for

MK

Ill

clear

for

MK

111

bridged

111

J II

For

Service

MAURITRON

8

Tel:·

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Manuals

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Tree

Oxon

OX94QY

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Contact

SERVICES

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Chinnor

Fax:·

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1.077.600

1.077.650

1.077.603

1.077.604

1.077.652

1.077.609

1.077.660

1.077.603.

1.077.665

1.077.632

1.077 .625 .

1.077 .626 .

01

1

Knob, switch, POWER

Knob, switch, POWER,

for

MK

111

1.077.635

1.077.636

OJ

,----

I

=.------,

For

Service Manuals Contact

MAUAITAON

Tel:-01844-351694

Email:·

-~

-~-----

TECHNICAL

8

Cherry

Tree

OxonOX94QY

enquiries@mauritron.co.uk

~-·-·-·---~-~

SERVICES

Ad,

Chinnor

Fax:-01844-352554

<(;

U)

co

U)

N

v

......

""'

0

""'

0

"

.-:

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...

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t:!

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...

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HOI

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ION

PART

NAME

TYPE I REMARKS

Unspez1fied

ca~bon

resistors: 1

SPECIFICATIONS

mm

/8

W

5%

..

Commercial

ORDER

NUMBER

types

IDENTI· FICATION

PART

NAME

TYPE I REMARKS

Unspezified carbon film

resistors: 1

/8

W - 5 %

SPECIFICATIONS

..

Commercial wpes

ORDER NUMBER

L303

303

L303

VU-Meter Board

VU-Meter

Lamp Socket Spring Contact Spring Contact

Lamp

Diode

Ge Ge-

Diode

Ge

- Diode

Ge-

Diode

Resistor

Capacitor Capacitor

assembled

2 pieces

AA

116

AA

116

AA

116

AA

116

carbon film carbon film carbon film carbon film carbon film carbon film

carbon film

carbon film carbon film carbon film

polyester polyester

36V-50mA

100 100

2.7 k

4.7 k

2.7 k

3300 pF 3300 pF

400 400V

1.077.468

1.077.470-02

1.077 .480-02

1.077.480-03

1.077.480-04

51.02.0104

V

.

•

.

*

.

*

•

*

. .

.

•

.,

*

.

*

.

•

.

. .

.

* * *

.

*

s 1

s 2

S3 S4 S5

p

301 P302 P303 p

304 P305 P306 p 307

c

301

C304

c 305 c 306

c 307

Switch Board

Connector

Connector Connector Connector Connector Coding Piece Switch Slide

Circuit Board Switch,

Circuit Board Switch, Circuit Board Switch,

Playback Cut-Off Switch

Potentiometer

Potentiometer Potentiometer Trim-Potentiometer

Potentiometer

Capacitor

4/9

3/10

5/8 5/8

assembled

l piece

(for

2 pieces (for 1.077.705)

1 piece (for 1.077.715) 1 piece (for 1.077.710) 2 pieces

7 pieces

Playback mode switch,

assembled

Before/ After-tape switch, assembled Input selector, assembled Input selector, assembled

assembled

Volume, assembled Volume, assembled

Balance, assembled Balance, assembled Ruwido S 76 K Input Level, assembled Input Level, assembled

elektrolytic tantalum tantalum electrolytic electrolytic

1.077.700)

(for

1.077. 720)

20%-0.15W

250 k

100µF-25V

3.3 µF

3.3 µF - 15 V 250µF 250µF

-15

- 25 V

25 v

V

1.077.426

1.077.435-05

1.077.435-03 1 .077.435·06

1.077.435-04

1.077.435-02

1.077.435· 10

1.077.435-07

1.011.400

1.011.300

1.011.500

1.011.500 1-.077.437

1 .077 .430·09

1.077 .430-09

1.077.430-08

. .

1.077.430-07

. .

•

*

. .

.

*

. .

1

INDEX

B

01 02 03 04 05

06 07

08 09

10

11

12

13

14

15

16

QTY

Push

Button,

1 5 4

1

Bearing strip, push Bracket, plastic I clear)

Push

button,

Push

button,

Unit

gray

red

1 Shield plate

1 Spring, tension, tape I

Bar

1

3 2

2 VU-Meter

1

switch,"

Socket Socket, Jack,

Shield plate

VU·

Meter

VU-Meter Bracket

Speakers

assembled

for

MK

1 Support

Push

2 2

1

button,

Switch, slide,

Lamp socket

7 Socket, plug,

red

with

for

assembled

7 Sleeve, spring

button

111

push

MK

( incl. 5 bars)

ift

Off

" "

button

111

PART

Reel

NAME

Motors

Off

",

assembled

ORDER NUMBER

1.077.490

1.077.490. 04

1.077 .490 • 05

1.077.490 . 06

1.077.100-14

1.077. 100 •

11

1.077 .355 . 03

1.077.500

1.077 .430 . 06

1.077.470. 03

1.077

.470.

04

1.077.485

1.077.470.

1.077.475.

01

1.077.475

1.077.471

1.077.115

1.077 .100 -

21

17 17 17 18

19

20

21

1

2

4 4 4

13 Contact

Switch, Boatd

Housing, switch ( Before I after tape switch ) Housing, switch ( Playback mode Housing, switch (

Rotor, incl. Spring, compression ( indexing) Ball ( indexing)

hollow

Input

shaft

selector J

switch)

For

MAURITRON

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Manuals

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Tree

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Fax:-

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Contact

SERVICES

1.011.300.

1.011.400.

1.011.500.

1.011.180

1.011.200. 04

41. 01.0130

1.010.001 - 55

01

gm

FH1

grn FH2

vio DF1

yel DF2

Tape Drive Control Commande du mecanisme

yel

013

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1i

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grn

blu {gm/blk)

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blk OFJ1

gry OF4

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016

017

COl

M

u.

c

...

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~

1.077. 370

For

Service

MAUAITRON

8 Cherry Tree Rd, Chinnor

Tel:·

01844-351694

Email:·

Manuals

TECHNICAL

Oxon

OX94QY

Fax:-01844-352554

enquiries@mauritronJJO,,_.

Contact

SERVICES

.--

u.

~

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Se~ice

MAURITR<!lN

8

Tel:·

01844·351694

Email:·

Manuals

TECHNICAL

Chetry

Tree

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~<?!!...9.X9

enquiries@mauritron.co.uk

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SERVICES

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Designations - Positions

Tape Drive

Mecanisme

C,

D,

F,

G,J, K

1.077.100

( 1.077.370, 1.077.525, 1.077.540)

Unspecified carbon film resistors·

at ion:

" • Commercial

• • Type d'usage

types

courant

fication

m

Part Name Designation

Power Supply Board Plaquette alimentation

Connector Coding Piece

connecteur

piece de codage Transistor transistor Transistor

Si-Rectifier Si-Rectifier Si-Diode Z-Diode

(Planar)

Trim-Potentiometer

transistor

redresseur au silicium

redresseur au silicium diode au silicium

diode Zener (planar)

pot. ajustable Resistor resistance Resistor Resistor Resistor Resistor Resistor

Capacitor

resistance resistance resistance

resistance carbon film a couche

resistance condensateur

Type

I Remarks

Type I Remarques

assembled

complete 1.077.540

';}

i.~

BC

177A,

BC

157A

SOT 9201

B

35 C 800 40

C 2200

BA

127

ZP12

Ruwido P

carbon film

76

K 2 .5 k - 0 .15 w -

a couche a couche

carbon film a couche

carbon film

a couche 4.7 k

carbon film a couche

electrolytic electrolytique

-

'7~

~

•

~s-<

-·"':;,-j-l

i'.foiilPh:::

..,,

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m

Specifications

Order Number

Specifications tJumero de commande

1.077

.540 -03

1.077.435-

..

5

TO

* *

10

* *

35

V-800 40V 50

V 12 V -

1 k 220 820

mA

2.2 A 100

mA -

5% -400

700

mW

20

%

* * * * B

* *

* * * *

* *

5.6 k 1k-5%-0.3 1000

µF - 35 V

w

* *

* * * *

Capacitor condensateur Capacitor

condensateur electrolytic electrolytique

tantalum

Fuse fusible 5 x Fuse

fusible

Drive Control Board Plaquette commande du mecanisme

-

5 x

less

and relays

01"

20

mm, slo-blo retarde

20

mm, slo-blo

push buttons

1f\"'7

fl

au tantale

retarde

sans touches rel a is

ni

3.3µF -35

V 2500µF -35 630mA 2A

V

* *

1.077.370

* *

---

~----~

.

___

,,.,.

..

__

.

Si-Diode

Z-Diode

Trim-Potentiometer

Resistor resistance

Resistor

Resistor Resistor Resistor Resistor

Capacitor

(Planar)

·~-·-----·

diode au siliciurn

diode Zener (planar)

pot. ajustable

resistance resistance resistance resistance carbon film resistance carbon film condensateur

---···-·-,··

µ"TV'-"

BA ZP

Ruwido P 76 K 2 .5 k - 0 .15 w -

carbon film carbon film

carbon film a couche

carbon fi

electrolytic electrolytique

127

12

'-t£.VV

Im

<tU

V -

50

V -

12 V -

a couche

1 k

220

820

a couche 4.7 k

a couche a couche

5.6 k 1k-5%-0.3W 1000µF -35

L.

.L.

100

5%

/-\

-400

mA -700

V

mW

20

%

I

* * * * * *

* *

* * * *

Capacitor conde nsateu r tantalum au tantale Capacitor

Fuse fusible Fuse fusible 5 x 20 mm, slo-blo retarde

Drive Control Board

Plaquette commande du mecanisme

Transistor

Transistor Si-Diode Si-Diode Si-Diode S-Diode Si-Diode

Si-Diode Si-Diode Si-Diode Si-Diode

Si-Diode Si-Diode Si-Diode

Si-Diode Si-Diode

Resistor Resistor

Resistor

condensateur electrolytic electrolytique

5 x

20

mm, slo-blo retarde

less

push buttons sans touches

and relays

BC

107 A

BC

140 C

PAB

diode au silicium diode au silicium diode au silicium diode

au

silicium

diode

au

silicium

diode

au

silicium

diode

au

silicium diode au silicium diode au silicium diode au silicium

diode au silicium diode au silicium diode

au

silicium

diode

au

silicium

resistance

resistance resistance wire - wound bobinee

212

PAB

212

PAB

212 50 V -

PAB

212

PAB

212

BA

127

BA

127

BA

127

BA

127

BA

127

PAB

212

PAB

BA

127

BA

127

wire - wound

(Siemens)

212

rel a is

bobinee 180 - 10 % - 5 w - 70°

bobinee

ni

3.3µF-35 2500µF 630mA 2A

-35

V

I I

I

50 V 50

50 50 50 V 50V 50 50 50 50V 50 50 50

180 - 10 % - 5 w - 70°

180-10%-5W-70°

200

mA - 70°

V -

200

mA - 70°

200

mA - 70° V - 200 mA - 70° V -

200

mA - 70°

100

mA - 70°

100

mAV - 100 rnA - 70° V - 100 mA - 70° V -

100

mA - 70°

200

mA-70 V - 200 mA - 70° V -

100

mA - 70° V - 100

mA-

70°

I

0

I

* * * *

* *

1.077.370

* *

* * * * ** * * * *

* *

* * * *

* *

* * * *

-·-·

.......

_,J

5 Si-Diode

6 7

8

9

0 1 3

4

5

Si-Diode

Si-Diode Si-Diode Si-Diode Si-Diode Si-Diode Si-Diode Si-Diode Si-Diode

Resistor

2 Resistor

3

Resistor

5 Resistor

5

7

3

~

)

I - R

- c 115

123

Resistor Resistor resistance Resistor Resistor

Resistor Resistor

Resistor Capacitor Capacitor

Capacitor condensateur

I

-···-·

-···

diode au silicium diode au silicium diode au silicium diode au silicium diode au silicium

diode au silicium

diode au silicium diode au silicium diode au silicium

resistance resistance resistance

resistance resistance

resistance resistance resistance resistance resistance condensateur condensateur

'

n1.1

~IL.

PAB

212

BA

127

BA

127

BA

127

BA

127

BA

127

PAB

212

PAB

212

BA

127

BA

127 wire - wound wire -

wound

wire -

wound

carbon film wire-wound carbon film carbon film carbon film carbon film

carbon

wireelectrolytic polyester metallized paper

comp.

wound

bobinee bobinee bobinee

a couche

bobinee

a couche a couche

agglomeree

bobinee electrolytique au polyester au papier metallise

bU

V - ;.!UU

50

V -

50

V -

50

V -

50

V-100

SO

V -

50

V -

50

V -

50

V -

50

V -

50

V 180 -10 180 -10 180-10%-SW-70°

1.5 k - 10 % -

470-10%-SW

1.8 k - 10 % -

470

15 -

1 k

4.7

1.2 K - 5 % - 9 W - 70° 500

µF

0.1 µF -

0.47

µF -150

ffiA -/U

200

mA - 70°

100

mA - 70°

100

mA - 70° mA-70°

100

mA - 70°

100

mA - 70°

200

mA -

200

mA

100

mA

100

mA - 70°

% - 5 w - 70° % - 5 w - 70°

10

% -

0.5

-

35

V

20

% -

V

70

- 70°

0.3

w

0.3

w

100

0

V

r

I

* * * *

* *

* * * *

* *

* * * *

* *

* * * *

* *

I

* *

* * * *

'-

RE.LC

re la

Reiay

Socket Strap ressort

Housing,

Slide, Spring, Reset ressort

Lock, spring arrl!t de ressort

Spring,

Contact

is

socle

de

maintien

Slides/battier des curseurs

curseur de

contact

de

rappel

a ressort

4 x switch

4 contacts inverseurs for

relay pour relais

for

relay plexi 5 pieces 5 pieces 5 pieces 6 pieces

contacts

120

pour plexiglas

V-

relais

I 1 A I

12V-180Q,

56.

99.0103

56.

99.0104

56.

99.0105

1.077

.360

- 01

1.077.365 -01

1.077.360 -02

1.077

.360

-

1.010.001.55

03

4 x

"'\

n1-i...v

ne1ay

Socket socle Strap ressort de maintien

Housing,

Slide, Spring, Reset ressort

Lock, spring

Spring, Contact

Contact

re1a1s

Slides/battier des curseurs curseur de

arr~t

contact

de

rappel

de ressort

a ressort

switch

4 contacts inverseurs for relay for relay

plexi

5 pieces

5 pieces 6 pieces

contacts

120

v~

pour

relais

pour

relais

plexiglas

/ 1 A I

12V-18UH

56.

99.0103

56. 99.0104

56. 99.0105

1.077 .360 -

1.077.365 -

1.077 .360 - 02

1.077 .360 - 03

1.010.001.55

01 01

c 153

- R 154

Tape Drive

Power Transformer, assembled Transformateur d'alimentation

Voltage Selector selecteur

Fuse Element Fuse fusible Fuse fusible Capacitor Capacitor Capacitor

Resistor Photoelectric Resistor photoresistance

Lamp Si-Diode Si-Diode

Mecanisme

complet

de

tension

porte

- fusible

condensateur condensateur condensateu r

resistance

lampe diode au silicium diode au silicium

gi;;;

I.-.

:;:- ~

i

m.

ie1;;rxa>

~

to!!1~~

<11~-.<z-·

:ffi::i-i-i~

....

0

':'!

';;~~~

!igo(,i!!!~

oc;e-<:r0Cl

:::i :i;:

~ta

!i-

S!!

ll:

assembled

T 955

Phil berth

5 x 20 mm, slo-blo

MP

( Rita )

MP

(

Rita)

ceramic ceramique

carbon film a couche

LOR (Philips I Valvo)

2322.600.94001

glass socket

PAB

212

BA

127

o:i~6'

o

:D-.

:r

=i

Cl)

Cil

!:!!

s::

::i::ll>

-·mo

8~K:::I

....

C'5

m

complete

retarde retarde papier metallise papier metallise

socle en verre

220 - 250 V - 0.5 A, T

110 - 150 V 1 A, T

3.5 µF - 10 % - 220 V

4.3 µF - 10 % - 220 V

1500 pF -

4.7

k

24

V-30 50 V - 200 50 V 100

10

% - 50 V

mA

mA mA

- 70°

1.077.100

1.077.525

53. 03.0126

53~

03.0113

* *

59. 99.0451

59. 99.0452

* *

57. 99.0135

51. 02.0140

* *

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435

brn

red brn

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1.077.

Ptaybod<

Heod

CHI!

For Service Manuals Contact yel ABB

MAURITRON

Tel:-01844-351694

Email:-

Playback

Head

CH I

TECHNICAL

8 Cherry Tree

Rd,

Oxon0X94QY

enquiries@mauritron.co.l.K

Chinnor

Fax:·

01844-352554

SERVICES

VU Plaquette

• Meter Board des

VU

Color Code: Code

des

couleurs :

red org

yel grn blu

vio

= = violet

• metres

red

orange

yellow green blue

red

AB7

vioAB14

- brn AB12

1.077. 480

rouge

orange

jaune

vert

bleu

violet

10.72

brn gry blk wht

=

brown gray black white

brun gr

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=

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- metres

couleurs:

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gray

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white

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Manuals

MAUAITRON

TECHNICAL

8 Cherry Tree

Oxon0X94QY

-·-··--·--·-

Rd,

Chinnor

...

Contact

SERVICES

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Designations - Positions

VU -

Meter

Board

I :

L..--...J

I

19

1'0

I

l

A,B,H

1.077.480

Plaquette des VU-metres Switch Board

1.077.435

Plaquette des commutateurs

Unspecified carbon film resistors: 1/8

W-

5 % 1

R6sistance a couche sans specification: • * Type d'usaqe courant

1/8 w-5%

·*Commercial

types

'ication

1n

4

Part Name Designation

Switch Board

Connector Connector Connector

Connector

Connector Coding Piece Switch Slide

Circuit Board Switch, 4 I 9 Commutateur pour circuit imprime

Circuit Board Switch, 3 I Commutateur pour circuit imprime

Circuit Board Switch, 5 / 8

I

Commutateur pour circuit imprime

Plaquette commutateurs

connecteur connecteur connecteur connecteur

connecteur

piece de codage

curseur a contacts

10

Type I Remarks Type I Remarques

assembled complete

I

1 piece

2 pieces

1 piece 1 piece 2 pieces 7 pieces

Playback mode switch, assembled Selecteur du mode de reproduction complet

I

Before I After -tape switch, assembled

Commutateur lecture - directe, complet

I

Input selector, assembled

Selecteur d'entree, complet

(for I pour (for/pour

(for I pour (for I pour

(for/pour

1.077.700)

1.077.705)

1.077.715)

1.077.710/712)

1.077.720)

I

Specifications Specifications

i.~

0)~61

0 ::0

-i

••.

<D-l'"Q\1;6<!

-e

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Order Number Numero

I

de

1.077.435

1.077.435 -

1.077.435 - 06

1.077.435 -

1.077.435-

1.077.435 - 07

1.011.400

1.011.300

1.011.500

commande

05 03

04 02

10

p 302

p 304

p 307

-

Playback Cut-Off Switch

Contact de coupure de

Potentiometer Potentiometer potentiometre Potentiometer potentiometre Trim-Potentiometer

Resistor resistance

Resistor Resistor

RPc;ic;tor

la

lecture

potentiometre

pot. ajustable

resistance resistance

n~sistance

assembled

Volume, assembled complet Balance, assembled complet

Input Level, assembled Ruwido S 76 K

carbon film a couche

carbon film a Couche

carbon film a couche

complet

comp let

--

250 k -

560

560 390 390

20

% -

0.15

w

.1.077.437

1 .077

.430

1.077.430

1.077

.430

* *

* * * *

- 09 08

- 07

-

\JJICUll

Commutateur pour circuit imprime

DUi:lrU

i:>WllCn,

q I

l::1

r-1ayoacK Selecteur du mode de reproduction complet

moae swrccn, assemo1ea

I I

1.011.400

Circuit Board Switch, 3 I 10 Commutateur

)4

p 302 p

304

p 307

- R 306 Resistor resistance

A 308

R 317 Resistor R

312

R

319 R 320 Resistor resistance R 321 R 323

Circuit Board Switch, 5 I 8 Input selector, assembled

I

Commutateur

Playback Cut-Off Switch

Contact de coupure de Potentiometer potentiometre

Potentiometer potentiometre Potentiometer potentiometre Trim-Potentiometer pot. ajustable

Resistor

Resistor resistance Resistor resistance Resistor

Resistor

Resistor Resistor resistance Resistor resistance

Resistor Resistor

pour

circuit imprime

pour

circuit imprime

la

resistance

resistance resistance resistance

resistance resistance

lecture

Before I After - tape switch, assembled

Commutateur lecture -directe, complet

Selecteur d'entree, complet

com

pl

assembled

Volume, assembled complet Balance, assembled complet Input Level, assembled

Ruwido S 76 K

carbon film

carbon film a couche

carbon film

carbon film a couche

carbon film carbon film carbon film carbon film carbon film

carbon film carbon film carbon film

et

comp let 1 .077

a couche

a couche a couche

a couche

a couche a couche 2.2 k

I I

250 k -

560

560 390 390

47 k

6.8 1 k 330

39 220 k

33 10k

20

% - 0.15 w

k * *

k

I

1.011.300

1.011.500

,1.077.437

1 .077.430 -

1.077.430 .430

* * * *

* *

* * * *

* *

091

08

- 07

c

305

c 307

Resistor

Capacitor

'

resistance condensateur

condensateur

carbon film electrolytic

tantalum

electrolytic

a couche 1 k

electrolytique

au

tantale

electrolytique

100µF

3.3µF250µF

25V

15 V

-25

V

I

~~~~~~~---1

* *

R

320 R 321 R

323

-·-~-·

Resistor Resistor Resistor

.

--·-~-~

...........

resistance

--·

...

····~

carbon film

carbon film a couche

carbon film

-

-----··-

a couche a couche

,.,.,l{.,V

33

k

10 k

2.2 k

''

I

* *

I

* *

C305

c

- L

L

307

303

Resistor Capacitor

Capacitor Capacitor condensateur

VU-Meter

Push-Button Switch commuteur a touche Record pre-selector preselection enreg.

Lamp Socket

I

Spring Contact Spring Contact ressort de contact 2 pieces

Board

resistance

condensateur

i~

:;:-!

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!'.foal

~ ~ u:i::o3!:'.~

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1[~-<a:m~

t;

Plaquette des VU-metres

VU-metres 2 pieces

socle de lampe ressort de contact

;:,,

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0-w

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carbon film a couche

electrolytic

tantalum au tantale electrolytic electrolytique

assembled complete

3 pieces

electrolytique

1 k 100µF

3.3µF 250µF

25V

-15

- 25 V

V

I I

I

* *

1.077.480

1.077.470 -

1.077.475

1.077.480 - 02

1.077.480 -

1.077.480 - 04

02 02

03

-

L303

-D R R

R

- R

354 352

354 360 358

Lamp Ge-Diode

Resistor Resistor resistance carbon film Resistor resistance carbon film

Resistor resistance

1ampe

diode au germanium resistance carbon film

3 pieces

AA

carbon film

c 352 Capacitor condensateur polyester

116 - AA 119

a couche a couche a couche a couche

au polyester

36

V-

100

2.7 k

4.7 k 3300

50

pF -

mA

400

V

5L

02.0104

* *

-

l303

L

303

t'ush-l::iutton Switch commuteur a touche

I

Lamp Socket socle de lampe Spring Contact Spring Contact

ressort de ressort de

contact contact

Record pre-selector preselection enreg.

3 pieces

2 pieces

1.077.475 -

1.077.480

1.077.480 - 03

1.077 .480 - 04

02 02

I - L

303

I - D 354

I

R

352

)

R 354

A

360

)

R

358

C352

I

Lamp

Ge-Diode

Resistor

Resistor Resistor Resistor Capacitor

lampe

diode au germanium

resistance resistance resistance resistance

condensateur

3 pieces

AA

116 -

carbon film carbon film carbon film carbon film polyester

AA

119

a Couche a Couche

a Couche

au polyester

36

V-

100

2.7 k

4.7 k 3300

pf

50

mA

400V

I

51.

02.0104

* *

• *

* * * * * *

R401

i-~~

180 K

R402

I\:·~

C402

Hn

'f

R403

180 K R422

l3,3JJC422

T

In

......

~~~~~~~~~

, , ,

1500p

3

ISK

R407

¥N

~R406 ~R408

18K

R427

- . - .

.....

~~

....

1 1 1 •

6,8K

~33K

6,8K

R428

~~~~~~~~~..._~~~~---9

33K

R409

R429

I

111

~68

R412

I

110~

C427

Tnl

~68

R432

1

I

..

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LO

MIC

HI

RADIO

4

2

3

4

5

6

7

8

9

10

7

5K

OIK

red

log

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RECORD

LEVEL

33K

'~

._.,

~RADIO

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I

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MIC

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~~

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r-n

AUX

Input Amplifier Amplificateur

d'

entree

1.077.

Diag.4

700

.,

Identification Position

Part Name Designation

Type I Remarks Type I Remarques

Unspecified carbon fiim resistors:

1/SW-

5 %

R4si>tance ~ couch•

1/SW-5%

sans sp'c!ficatiOn: • •

Specifications Specifications Numero de commarn

• • Commercial

Type

Order Number

1

types

d'usage courant

Input Amplifier

0401

0402

Q 403

Q 421 Transistor

0422

0423

R 401 R 421 Resistor resistance

R 402 R 422 Resistor resistance

R 403

R 423

R 404 R 424 R 405

R 425

R 406

R 426

R 407

R 427

R 408 R R 409

R 410 R 411 R 412

c 401

c 402

c 403

C404

c 405

c 406 c 407

428

A 429

R

430 R 431 R

432

c 421 Capacitor

C422 C423 C424 C425

c 426 Capacitor c 427

Transistor

Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor

Capacitor Capacitor Capacitor

Capacitor

Amplificateur d'entree

resistance resistance resistance resistance resistance resistance resistance resistance resistance resistance condensateur condensateur condensateur condensateur condensateur condensateur condensateur

Board assembled

BC

179

B,

BC

109

C,

BC

lOB

B,

BC carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film

tantalum

tantalum ceramic electrolytic

electrolytic ceramic

tantalum

plaquette complete

159 B 149 C 148 B

a Couche

a couche

ii couche

a couche

ii couche ii couche

a couche

au tantale au tantale ceramique

electrolytique electrolytique ceramique au tantale

1M

180 k

100k

k

22

47 100k 18 k

6.8 k 33

k

6.8 k 220 68 k 10µF

15 v

3.3µF 1500 pF - 10 % 125µF-3V 50µF 22 pF 10µF

-3

15V

V 10% 15V

50V

1.077.700

..

*.

• *

• * * *

* *

..

* *

..

For

Service Manuals

MAURITRON

8 Cherry

Tel:-01844-351694

Email:·

TECHNICAL Tree

OxonOX94QY

enquiries@mauritron.co.uk

Contact

SERVICES

Rd, Chinnor

Fax:-

01844-352554

Identification Position

Part Name Designation

Type I Remarks Type I Remarques

'fledearbonfll

Unspect

1/BW-6%

R<islstonce i

1/SW-5%

m

Nt$iltots:

eouche

S61\s

spklflcotion

Specifications Specifications

• • Commercial types

:

• • Type d'usage courant

Order Number

Numero de command

1

Q 501

Q 502

0503

Q 504

p

501

p 503

p 504

R 501 R 503 R 504 R 505 R 506 R 507 R

508 R 509 R

510 R 511 R R 512 R 514 R 515

R 516 R 517

R

518

c 501 c 502

c 503

c 504

c 505

c 506

c 507 c 508 c

509

c 511 c 512

c 513 c 514

c 515

C516

C517

L 501 L 502

0505

p

502

R 502

513

c

510

Record Amplifier Amplificateur d'enregistrement

Transistor Transistor Transistor Transistor Trim-Potentiometer Trim-Potentiometer Trim-Potentiometer

Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor

Resistor Capacitor Capacitor

Capacitor

Choke Coil

resistance

resistance resistance resistance resistance resistance

resistance

resistance resistance resistance resistance resistance resistance

resistance condensateur condensateur

condensateur

condensateu r

condensateur

bobine d'arret

MPX

bobine d'arret

pot. ajustable pot. ajustable pot. ajustable

MPX

Board assembled

BC

109

B,

BC

108

B,

BC

178 A,

BC

108

B,

BC Ruwido P 76 K Ruwido P Ruwido P 76 K carbon film carbon film carbon film carbon film

carbon film

carbon film carbon film carbon film carbon film

carbon film carbon film

carbon film carbon film carbon film

carbon film

tantalum electrolytic

ceramic

polyester

polyester polyester

electrolytic

polystyrene electrolytic tantalum tantalum polyester

polyester tantalum polyester polystyrene assembled assembled

76

plaquette complete

149 B 148 B

158 A

148 B

K

a couche a couche

il couche

a couche a couche

a couche

a couche a couche

a couche

a couche 100 k

a Couche a couche

a couche

au

tantale electrolytique ceramique au polyester au

polyester au polyester

electrolytique au polystyrene electrolytique au tantale au tantale au polyester au polyester au tantale au polyester au

polystyrene complete complete

20 k - 10 % 20k-20% 500 100 k

1.5 k

3.3 k

3.9 k k

1

1 k

56

k

1.8 k

4.7 k

220

k

56

k

330

1 k

680

2.2 k

3.3µF

lOOµF-3 47 pF - 10 %

0.1

µF-10%

3300

pF 2700 pF 25µF 180pF-10%-160V 10µF-35V 1 µF

-15

47 µF

0.033µF

O.Q1

µf

3.3

µF-

3300

pF 390pf-5%-160V

0.15W

20%

0.15W

15 v

V

10%-400V

25 v

V

3V

-10%-250

- 10 % - 160 v

30V

-10%

50V

100V

400V

1.077.705

••

...

..

• *

..

*.

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* •

**

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..

1.077.750

1.077.707

lK

R507

25µF

-111

c 507

180pF

C508

f

~

220K

R51l

lOOK

R514

+ 12V

6

- ;

4

100

I

el7'12

,E'

33/4

-

6

1,5K

R503

R506

47pF

4

~lpF

Tc5o4

+av

56K

R508

4,7 K R

510

":t-

i_

o:c2V

56K

R512

0,033pF

C513

L502

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REL 601

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12

13

12

715

•

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'f'

mp

1 1cateur d enreg1strement

A l

. .

1.

077.

705

Diag.5

Identification Position

Oscillator Board

Part

Name

Designation Type/Remarques

Plaquette oscillateur 2-track, assembled

4-track, assembled 4 pistes, complete

Type/Remarks Specifications Order Number

2 pistes, complete

Unspecified carbon film resistors·

1/SW-5%

R8sls:tance$ a

!ISW-5%

red point rouge sur bobin. oscill.

yellow point jaune sur bobin. oscill.

couche

Specifications

dot

on oscillator coil

dot

on oscillator coil

iaOS

spOcification:

••Commercial rvpes

""'Type d'osage courant

Numero de comma.

1.077.712

1.077.731

Q 703

Q 704 Transistor

R 715

R 716 - R 719 Resistor resistance

R

720-

R 723

c 708 c 709

c

710-

c 711 Capacitor condensateur

c 712

L 703

L 704

L 705

Resistor resistance carbon film a couche 18 k

Trim-potentiometer pot. ajustable

Capacitor condensateur

Oscillator coil bobinage oscillateur 2-track, assembled

Oscillator coil bobinage oscillateur

Choke coil

bobine d'arret assembled

BC

140 · 10

carbon film a couche 1 k

carbon type

polystyrol

polystyrene

polystyrol

electrolytic electrolytique

4·track, assembled

au

carbone

au

polystyrol 470

au polystyrene

au

polystyrol 220 pF - 5 % - 160 V

2 pistes, complete

4 pistes, complete

complete

50k

3,3

250µF

pF

nF

20%

- 5 %

1%-125

25 v

0,15W

160V

v

..

.. .. ..

..

1.022.110

1.022.112

1.077.707

CHANNEL l CHANNEL

rod

RECORO

T

I

I blu

grn

U

l,2k

L601

R

715

~

eJ

I

6

7

L.2f- i r

L703

2 -track

L

704

4·trock

4

!)

iicwo

'f

I I

Position "Record - Stereo", voltages measured against ground

Position "enregistrement stereo", tensions par rapport a

Test points

Points de mesure 2 - pistes 4 pistes

@

approx. 22V

L

-

I

2-

Track 4 - Track

/120

18k

705

t-

C7!2

(OV)

la

masse

kHz approx. 18V/120

(OV)

kHz

7'12

33/4

or9

vlo

blk

wht

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brn

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AF

- Test (oscillator pulled out), full modulation

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@

BF

(oscillateur retire), modulation ii O

approx. 44V/120 kHz approx. 36V/120

500 mV/120 kHz

50mV/

400 mV/120 kHz

1 kHz* 40 mV/

dB

kHz

1 kHz*

Test

values@

Les

tensions aux

indiquees sont nominales.

and @ depend on type and speed

points@

et

@ different suivant

of

tape; they are

le

type

et

la

to

be

considered nominal.

vitesse

de

la

bande;

Oscillator Oscillateur

les

valeurs

1.077. 712

Diag.6a

-----------··~-

.

...........__.

Identification

Position

Part Name Designation

Type I Remarks Type I Remarques

Unspecified carbon film resistors:

1/SW-5%

A'sistance a couctle sans sptkification:

1/SW-5%

Specifications Order Number Specifications

• • Commercial types

• • Type d'usage courant

Numero de commanc

0601

D 601 R 601 R 602 R

603

R 604

c 601 c

602 REL 601 L 601

Record Relay Relais Transistor Si-Diode

Resistor resistance Resistor resistance Resistor resistance

Resistor resistance Capacitor condensateur Capacitor

Relay

Dummy Head bobine

d'

enregistrement

diode

au

silicium

condensateur relais

de

charge fictive

Board assembled

AC

152

BA

127 carbon film carbon film carbon film carbon film polyester electrolytic

ITT

PZ

4/A 2

610 ( 24)

assembled complete

plaquette complete

a Couche

a couche a couche a couche

au polyester electrolytique

50

V-100

mA

10

1 k

3.3

k - 10 % -

approx. 1.2 k -

0.47 µF 500

20

µF - 3 V

0,3

w

0.5

W

% - 100 V

1.077.715

..

• *

..

* •

56. 04.0121

1.077.755

RECORD

2

5

·~

0~47µ

F

C601

1~;;

12 9 6 3

14 13

•

~

•

500µF

C602

I

1K R602

10

AC152

a

3,3K R603

601

cbREL

14

1,2

K

R604

601

i L601

1

I

10

11

..

7

a

•

~

BA127

0601

CHANNEL

..

2

3

2

8

6

7

10

4

5

3

4

5

6

7

8

9

10

Il

T

I I

I

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(ZcHr

~

I;

is

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i;R

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g

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d'

enregistrement

ton.

Diag.7

11s

Identification Position

Part Name Designation

Type I Remarks

Type I Remarques

u

if

nspec 1ed

carbon

1/SW-5%

Aolslstanca ~ couche

1/SW-5%

Specifications Specifications

Um

resistors :

sans

spkiflcatitm

• • Commercial types

:

• •

Type

o·u~

Order Number Numero de commanc

courant

0

801 0 803 0804

R 801 R 802 R 804 R 805 R 806 R 807 R 808 R 809 R 810 R 813 R 814 R 815 R 816 R 817 R 818

R 819 R 820

R 821 R

822

p 801

c 801

C802 C803 C804

c 805

C806 C807 C808 C809

c

810

C811

c 813

C814

L 801

0802

0805

R 803

R 811

C812

Playback Amplifier

Amplificateur de reproduction

Transistor

Transistor Transistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor

Resistor

Resistor Trim-Potentiometer Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Choke Coil

resistance resistance resistance resistance resistance resistance resistance resistance resistance resistance resistance resistance resistance resistance nisistance resistance resistance

resistance

..

resistance

pot. ajustable condensateur condensateur condensateur condensateur condensateur condensateur condensateu r condensateur condensateur condensateur condensateur condensateur condensateur bobine

Board assembled

BC

109

C,

BC

109

B,

BC

108

B,

BC carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film

carbon film carbon film carbon film carbon film carbon film carbon film

carbon film carbon film Ruwido P 76 K Polystyrol tantalum electrolytic electrolytic polyester polystyrene polyester polystyrene polyester

tantalum electrolytic electrolytic tantalum assembled

p!aquette complete

149 C 149 B 148 B

a couche

il couche

a couche

a couche a couche a couche a Couche a Couche

a couche

a couche a couche

a couche

a Couche

a couche

a Couche

au polystyrol au

tantale electrolytique electrolytique au polyester au

polystyrene au polyester au

polystyrene

au

polyester au tantale electrolytique electrolytique au

tantale complete

220 k 100 k 220 12 k

68

1k

330

k

4.7 k

2.2 k 1 k 330 150 k 150 k 330 10 k

68

lk

1 k 22 k 20 k

20%-0.15W

330pF-5%-160V

3.3 µF

-15

V

1600µF-3V

3.3µF

-35

V

.01

µF - 5 % - 160 V

100

pf

- 10 %

lOOOpF-10

390

pF - 5 % - 160 V

3300

3.3µF-15 100J.IF-3V

25 µF - 25 V

10 µF - 15 V

%

pF - 10 % - 400 V

V

160V

400V

1.077.720

..

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1.077.750

6

9

2

330K

R808

4,7K

R

809

-

2,2K

R810

100

pF

-

Tc's12 d

I -

,.------r-1,.

Io

I

nAA

®

rJI

_____....IV

I

tr'\

..

C'

-

4,7K

R811

C803

1K~uq

2t

I

1R8071R8l2

CH

,I

I

.I

5

12

3

4

5

6

7

8

9

10

11

12~

13

SPEAKERS

OFF-

390

1.077.850

L

if:;F-

--------------------~~-----·--·------------

71/2-33/4

CROSSTALK COMPENS.

3

_$_2

__

COMPENS.

OIAPHONIE

8

4,7K

Test points :

2

·Track

0

4 Track approx. 140 mV

approx. 200

@ Balance, Control Range ± 7

Points de mesure :

mV}

1 kHz, full modulation

dB

-:-

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·

4

pistes env. m

de

reglage

140

de

V a 1 kHz

la

balance ± 7

et

modulation maximum

dB

Playback

Amplificateur de lecture

Amplifier

1.077.

720

Diag. 8

f3~

s~a

!i-1!

~ea

Identification

Position

Part Name Designation

Type I Remarks Type I Remarques

Unspecified carbon

1/SW-5%

R6sistance

A couche

1/SW-5%

Specifications Specifications

film

resistors :

sans

sp4cification :

• • Commercial types

• • Type d'usage courant

Order Number

Numero de command

1

!

0901

Q 902 Q 903 Q 904

Q

905 D 901 D

903 R 901 - R R

904 R 905 R 906 R 907 R 908

R 909 R 910

R 911 R 912 R 913

R 916

R

918

R

919

0906 D

902

903

R

920

R 917

Loudspeaker Amplifier

Amplificateur de haut-parleur

Transistor Transistor Transistor Transistor

Transistor Si-Diode Si-Rectifier

Resistor

Resistor resistance

Resistor

Resistor resistance

Resistor

diode au silicium redresseur au silicium resistance resistance resistance resistance

resistance resistance

resistance

resistance resistance

Board assembled

BC

177 A,

BC

107 A/B,

BC

107 A/B

BC

177 A SOT 9201 BA

127

B

40

C 2200 carbon film carbon film

carbon film carbon film

carbon film carbon film carbon film

wire

carbon film carbon film

plaquette complete

157 A

BC

147 A/B

a couche a couche a Couche

ii couche

a couche a couche

a couche

a Couche a couche

a couche

bobinee

a couche a couche

1.077.850

..

50 V-100 mA

47 k

3.3 k

2.2 k 680 3,3 k 1

k

6.8 k • * 680

220 680

3.3 k

1-10%-1

3.3 k

4.7 k

w

* * * *

..

* •

* *

• *

* * * •

*.

• *

c 901

c 902 c 903

c 904

c

905

c 907 c 909

c

910

c 911

F 901

Capacitor

Capacitor Capacitor

c

906

c

908

Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor

Fuse

condensateur condensateur

condensateur condensateu r condensateur condensateu r condensateu r

condensateur

fusible

tantalum tantalum au tantale ceramic tantalum

polyester electrolytic polyester

ceramic ceramic 5 x 20 slo-blo

au

tantale

ceramique au

tantale au polyester electrolytique au polyester ceramique ceramique retarde

4.7µF-10V 47

µF-3

V

220

pF - 10 % -

10µF

-15

V

0.1

µF - 20 %-100 V

2500µF

-

2~

V * *

.1

µF - 20 % - 100 V

560pF-10%-50V

47 pF - 10 % -

1.25A

50

V * *

50

V

* • *.

* *

• *

* *

..

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K

47K R902

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R903

C91011

T

10µF

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220pF

3,3K

R907

IBA127

0901

0902

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220

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r

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9

10

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13

Loudspeaker

Amplificateur

Amplifier de

haut·parleur

1.0n.850

Diag. 9

Identification Position

Part Name Designation

Type I Remarks Type I Remarques

Unspecified carbon

118W-

5%

Rftis:tance A

1/8W-

eouche

5%

Specifications Specifications

fUm

resistors;

sans spkificat:ion:

• • Commercial Types

• • Type d'usage courant

Order Number

Numero de command·

0201 0 202 0203 0206 0208

Q 209

D

201 D 205 R

201 R 202 R 203 R 204

R 205

R 206 R 207 R 210 R

211 R 212 R 213

R 214 R 215 R 216

R 217

R 218 R 219 R 220 R

221

R 222

R 223

R 224

R 225

R 226

R 227

p

201

C201

c 202

c 203

c 204

c 205

C206

c 207

c 209

c 210

c

211

c 212 c 213

T201

0204 0205

0207

- D 204

R 209

C208

Speed Control Transistor

Transistor Transistor Transistor Transistor Transistor Si-Diode Si-Rectifier

Resistor

Resistor Resistor Resistor Resistor

Resistor

Resistor Resistor Resistor Resistor Resistor Resistor resistance Resistor resistance Resistor Resistor Resistor Resistor

Trim-Potentiometer Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor

Discriminator Coil

Regulation de vitesse

diode au silicium redresseur au silicium resistance resistance resistance resistance resistance resistance n!sistance resistance resistance resistance resistance resistance resistance resistance

resistance

resistance resitance resistance resistance

resistance resistance

resistance

pot. ajustable condensateur condensateur condensateur condensateur condensateur condensa teu r

condensateur condensateur condensateur condensateur condensateur condensateur

bobine du discriminateur

Board assembled BC

108 A/B,

BC

178A,

BC

107

A,

BC

108 A/B,

BC

178

A,

40

318

(RCA}

BA

127

BY

123, B 280 C 800 carbon film carbon film carbon film carbon film

carbon film carbon film carbon film carbon film carbon film metal film, TC/CT: metal film, TC/CT: 1 O

carbon film carbon film carbon film

carbon film carbon film

carbon film a couche

carbon film carbon film carbon film a couche

carbon film a couche

carbon film

Ruwido P76K, T-film I a couche T

polyester polyester polyester electrolytic

polystyrene

polystyrene electrolytic electrolytic electrolytic electrolytic MP

plaquette complete

BC

148 A/B

BC

158A

BC

147 A

BC

148 A/B

BC

158 A

a Couche

a couche

ilcouche

a couche

a couche a couche a couche

a couche

10-4fC

a couche a couche

a Couche

a couche

ii

a couche

au polyester au polyester au electrolytique au au

au electrolytique electrolytique electrolytique

electrolytique

au papier metallise

film metallique

0

·4

/

c film metallique

couche

polyester

polystyrene polystyrene

polystyrene

1.077.725

* *

..

• *

*.

50V-100mA 280V

BOOmA 22 k 10 k

1.8 k 100 k

2.2 k 330

10 k

47 • *

2.2 k 10 k

2%

.3W

8.2 k

2%-

.3W

1.5 k

10%-

.5W

150

68

4.7 k

2.2 k

5.6 k 1 k

2.2 k - 5 % - .3 w

2.2 k 1

k-5%-

1.5 k - 5 % - .3 w 1 k 10-10%-.3W 22-10%-.5W

2.5k .1,uF-20% .022 µF - 20 % .47 µF 25,uF

1200 pF .022 µF - 1 % - 125 V .068µ.F

250,uF-3

25µF

10µF

250µF -25

.47 µF

-20%-

20

25V

25V 35V

.5W

.15W

100V

% -

1%-500V

1%

V

150V

250

100

63V

V

* *

*.

* *

**

..

* *

• *

57. 33.3103

57. 33.3822

* *

..

**

..

• *

* *

• *

..

* *

** * •

* * * *

* *

** * * * * * *

..

59. 23.5122

59. 23.1223

59. 23.0683

* *

• *

* *

..

* *

1.077.765

,------

I

:

1

--

Test

points:

Points de mesu

Voltages against ground

20

kil

Tensions en volts mesu rees

par rapport a

avec un voltmetre

20

kn

re

:

in

volts, measured

(OV)

DC·

la

with a

meter

masse

DC

IV

Iv

de resistance interne

(OV)

de

lo•

R20Z

----

___

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C

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1K

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21

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22

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®

7,5

2

0,8

35 - 50

mV

elf

( 800

©

0,4 3 5

10 1

15

@

®

80

200

0

Hz

" 3 3/4 ips)

Start (full voltage on motor,

Demarrage (toute

Operation (nominal values, depend on motor loading) Marche (valeurs nominales dependant de

Speed higher than nominal (no voltage on motor,

Vitesse superieure a

la

0209

tension au moteur,

la

vitesse nominale (pas de tension au moteur,

saturated)

0209

sature)

la

charge du moteur)

0209

cut

off)

0209

bloque)

il.~s~

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Speed Control Regulation de vitesse

1.077. 725

Diag.10

IGlllMENT INSTRUCTIONS REVOX A 77 DOLBY

1 Operation

Adjustment Voltage

Adjustment ($.M.6.2.U

Bias-Filter record I S.M. 6.4.3.l

Bias-Filter, replay Adjust for minimum voltage

(S.M. 6.4.4.)

Motor (S.M. 6.2.2.l

Oscillator and

Sias adjust

DOLBY

DOLBY"OUT"

DOLBY

DOLBY replay

adjustments

DOLBY"OUT'

DOLBY"IN"

VU-Meter calibration Connect

Balance

Playback

adjustment

Playback

Frequency

Record head azimuth

adjustment

RF

of

Speed

record adjustments

"IN"

Adjustment

head

level

off

response

Bias

Adjustment

regulated· Adjust exactly to nominal

Tacho

Head

azimuth

test tape

check

Alignment Procedure Test Equipment

21

volts

Alter

head

position

specified tacho voltage Adjust for minimum voltage

Adjust tacho frequency (

sure over at As per Service Manual 6.4.

Adjust dummy load

Turn

FET-bias

control

to

DOLBY

switch ~ in position

"OUT" Connect Audio GeneratOf

"AUX"

inputs,

Adjust

level

Adjust level on Generator DOLBY switch in

measure

voltage

DOLBY

output

Level adjustment

Level reduction Turn FET bias

Set gain control amplification. DOLBY

switch ~ in Connect Audio Generator to T 19 DOLBY

inputs Adjust

level

DOLBY

switch

Adjust

level

DOLBY

outputs

Level

increase

Audio

to

"AUX" Adjust generator output level 1 kHz Calibrate VU-meters 1 kHz

As

per Service Manual

sections 6.3. Playback level calibration

As per Service Manual 6.3.4.

and addittonaJ instructions.

"REC.

CAL"

fully

ccw.

T1

9 generator

adjusted

for

Reduce generator

Adjust azimuth

As

per Service Manual 6.5.2. T19

A U

for

Scotch 207

to

least

10

off,

set gain

minimum amplification P 102 r (CH

on Generator

pos.

rise

on

by

2 dB

off,

to

min.

(with

on

generator

e:>

in

reduction

by 2 dB

Generator

inputs.

1.

and

6.3.2.

pot-meters

level ( "-

0 VU indication.

level

as

per S.M. 6.5.3.

Multimeter 7.5

obtain

mea-

sec.

I 3.75

to

"IN",

pos.

"OUT"

test clips

I.

pos.

"JN"

on

e/~

13

m V )

-20

dB

Electronic Volt-

meter

Electronic Volt·

meter

Electronic Volt·

meter

Digital Counter

Electr.Voltmeter Digital Counter Digital Counter

T19

VTVM

T 19

VTVM

T

19

T 19

VTVM

T 19

VTVM

T 19

VTVM

T 19

VTVM

T 19

T

19

VTVM

T 19

or

generator

DOLBY

reference

tape

VU-Meter

Tape Speed ips

3.75

7.5

7.5 185 nWb/m P801

7.5

3.75

Frequency

120 kHz

1601

Hz

800

Hz

120 kHz 2 Track 120

kHz±

120

kHz±

5 kHz

5 kHz 5 kHz

5 kHz

1 kHz

10 kHz

5 kHz

Voltage

+21 V

40m

<300mV

<

50mV

10V

"-

0.45

3mV

2.6mV

"'7

mV

{+BdB)

8.2mV (+10dBl

-2dB

7.6mV

-10dB

= 2.4 mV

+ 2 dB

~3mV

"-'

13mV

100mV

OVU

=OVU

vu

OdB

-20dB

4dB

5dB

DC

V AC

21

mV

Testpoint

Yellow wire p 106

ED 1

El

E2

see

fig.

6.4.-63/64 Wiper P

Pin 2 on T

VAC

HB3-HB6 HB3-HB6 HB3-HB6

P1,

P2

P3,

P4

P3,

P4

P3,P4 P 102 r

P3.

P4

P5,

P6

P7,

PB

?7,

PB

P7,

PS

Pl,

P2

OUTPUT CH

1,CH II

801

201 T 201

Where

mounting

of

L

p blue &

Dummy load L P101r(CHl,CHl1l

Generator

GeneratOf Generator

P

101 P101p(CHl,CHll) P 102 p (CH I,

p 102 p

P

101

p 103 p

print

to adjust

tacho·head

501

801

201

orange

r

077.720

screws

wire

I,

CH

601

Ill

11

l

llPUf

AMPLIFIER

RECORD

LEVEL

RECORD PRESELECTOR

[

0

[

0

wht

RECORD PROCESSOR

!aS:i

I

AL

25

blu

- I

I

~

800

Hz ~ v.our osc.

Ql,2,4

I

P103r

.J:

P101r

f'FET

~Pl;2;i

:f'GAIN

Q5

Q9

I

OUT

ML

21

RECORD AMPLIFIER

DOLBY

OUT

~

vu

.""

L_

I-----,

-·

t

P101p

FE

_____

a

1,2,3

T

PLAYBACK PROCESSOR

----

~

p

103p

~VU-METER

t

P102p

GAIN

--;5;1

•

~

' I

-ll!!l~mv

'

"

_

BEFORE/AFTER

TAPE

~

AL

5

AL

9mV

At.

ti

SWITCH

----i

APE

NPUT 0 I

CALIBR .

.1..

-1

__

'1::>---1---------'

!

- I

,J

AL

22

I

...

g

~

c::>

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-

(')

i

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0

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8~~

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•

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VOLUME

,,

0

~!!::

f!::0

m~

~11-

N N

-'

z <

"[

DOLBY

2

-'

N

!M

MONO

STEREO

~

-0

---0

!i!5mV

LINE

AMPLIFIER

BALANCE

Function

Diagram

A 77

DOLBY

AMPLIFIER

0102

MPX-FI LTER

LOW-PASS-Fl LTER

04

VU-OUTO-_,.,__

HIGH-PASS DYNAMIC-FILTER

05

__________

AMPLIFIER

0607

LIMITER DOLBY ON-OFF

D2D3

___,C>--~----~-~-~

MAIN SIGNAL

03

AMPLIFIER

09

INPUT

.MP.INP.

to

CH

II OSCILLATOR

o---i

C>

~0

011

012

CALIBRATION

AMPLIFIER LOW

01

C>

[>

ON-OFF

,,f

\

PASS

02

re

I

MPX.-FILTER

~

to

CH

FILTER

\

...

.,~,

ON-OFF

RECTIFIER

HIGH-PASS DYNAMIC·FILTER

TP

INTEGRATOR

05

....L

+-f-

T

11

AMPLIFIER

03

vu.ouTu-~--~~~~~~~~~~~~~~;.::::>-~~~~~~~~~~~~~~~~~~~~~~-u

08

BIAS FREQ.

FILTER

AMPLIFIER

0607

OUTPUT

DOLBY ON-OFF

PROCESSOR

OUTPUT

LIMITER

02 03

·>>'·''

.....

-----

DOLBY·ON-OFF

04

C>

RECORD

1::.:-~j!!jj'l!ll::

'------1~~~~~~~~--\J

DOLBY ON-OFF

I UT

PUT

J-METER

09

VU-AMPLIFIER

RECTIFIER

INTEGRATOR

08

BIAS FREO. FILTER

NEG.

FEEDBACK/DIFFERENTIAL SIGNAL

PLAYBACK

Block Diagram A

PROCESSOR

77

DOLBY

---------·

·~.

~---1

,

I DEl\ITI Fl-

CATION

Cl

Rl

PART

Interconnection

NAME

1.077.854

Connector Connector

Coding

Flat-Connector

Capacitor

Resistor

Piece

TYPE I

assembled

for

2 pieces

6 pieces

elektrolytic

carbon

REMARKS

1.077.853

1.077.852

film

Unspezified carbon film resistors:

1/8

w

5%

SPECIFICATIONS

100 -

5%

- 0.33 w

**

Commercial types

ORDER

NUMBER

1.077.854

1.012.134

1.012.166

1.077.435.-10

54.02.0320

* *

For Seivice

MAURITAON

a

Tel:·

01844-351694

Email:-

Manuals

TECHNICAL

Cherry

Tree

QxonOX940Y

Fax:-

enquiries@maurilron.oo.uk

Contact

S~RVICES

Rd,

Chinnor

0.1844-352554

CHI

'O

<t

::E

<t

~

c

c;.

N

::E

<t

-·--,

CHII

ML33

blu

r--:-·-·-

1 L

I

·-·-·-

-·-·

·-

RECORD

PROCESSOR

1.077.653

-·-·-·-·-·-1

PLAYBACK

PROCESSOR

1.077.852

JI

RECORD CALIBRATION ·

. - .

--. --, __

1.077.3~

+27V

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ov

1·-·-1

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or

i

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I

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0

o~

-"\I

AL9grn

BL6gry

AL5

arn

P4

P2

Pt

P3

P7

P5

P6

PS

Interconnection

1.

077.

854

rl·

"ION

PART NAME

TYPE I REMARKS

Unspezifled carbon film resistors:

118

W-5%

SPECIFICATIONS NUMBER

..

Commercial types

ORDER

IDENTI· FICATION

PART NAME

TYPE I REMARKS

Unspezified carbon

118

W-5

%

SPECIFICATIONS

film

resistors:

..

Commercial types

ORDER

NUMBER

Playback Processor

1.077.852

Capacitor

1

Capacitor

2

Capacitor

3

Capacitor

4

Capacitor

5

Capacitor

5

Capacitor

7

Capacitor

3

}

Capacitor

)

Capacitor Capacitor

I

Capacitor

2

Capacitor

3

Capacitor

4

Capacitor

5

)

Capacitor Capacitor

7

Capacitor

3

}

Capacitor

)

Capacitor Capacitor

I

Capacitor

1

Capacitor

3

Ge-

1

2

3

4

5

)1 )2 Trim - Potentiometer )3

Diode

Si

- Diode Diode

Si Ge

- Diode

Si

- Diode

Z-

Diode

Flat - Connector

Potentiometer

Trim

Trim - Potentiometer

Transistor Transistor

Transistor

Transistor Transistor Transistor Transistor Transistor

Transistor

assembled

tantalum elektrolytic polystyrene

polystyrene

tantalum

polyester tantalum polystyrene

polystyrene tantalum

polyester electrolytic tantalum polyester

polystyrene

polyester

polystyrene tantalum polyester

polyester

elektrolytic tantalum

AA

116

TN

914

TN

914

AA

116

1N 914

BC

T08

B

BC

T08

B

BC

T09

C

BC

T08

B

2N

5458

BC

109 C

BC

178 B

BC

109 C

BC

108 B

10µF 47

330 pF

TOµF-

0.1 10µF

33 nF

4.7 TOµF-

0.1

47

10µF-

0.1

150 pF

O.T

22

470

TOµF-

0.1

0.33µF 47

10µF-

7 .5 v - 5 % - 0.4 w

10

1 k

500

50%-

-

µF -

100%-

5%-

1

k - 20% - 0. 15 w

5%-

nF-

50%20%

µF -

50%-

1%1%-

µF

50%-

µF -

20%

µF - 100%

50%20%

µF

5%5%-

µF nF-

5%

pF -5%

50%-

µF -20%-

20%-

TO%-

µF-

50%

20%-0.15

-20%-0.15W

- 160V

16V 25V 63V 25V

16V

160V

16V 63V 63V

16V

160V

25V 25V

63V

100V

250V

63V

16V

160V

63V 25V

16V

w

1.077.852

.

. .

.

•

.

*

.

*

. .

• •

. .

.

* *

*

•

*

. .

•

*

.

*

.

*

.

*

.

*

. .

54.02.0320

*

..

.

•

*

.

*

.

*

.

*

.

*

. .

.

R 1 R 2 R 3 R R 5 R 6 R 7 R R 9 R

10

R

11 R 12 R

13

R

T4

R

15 R

16 R

17 R 18 R

T9 R 20 R

21

R

22 R 23 R 24 R 25 R 26 R

27 R 28 R 29 R 30 R

31 R 32 R 33 R 34 R 35 R 36 R 37 R 38 R 39 R40 R

41

L 1

.

Resistor

Resistor Resistor

4

8

Resistor

Resistor Resistor Resistor

Resistor

Resistor Resistor

Resistor Resistor Resistor

Resistor

Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor

HF

choke

carbon film carbon film carbon

film

carbon

film

carbon

film

carbon

film

carbon

film carbon film carbon

film carbon film carbon film carbon film

carbon film carbon film

carbon film

carbon

film

metal

film carbon film carbon film carbon film carbon

film

carbon

film

carbon

film carbon film carbon film carbon film carbon

film carbon

film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film carbon film

carbon film

carbon film carbon film

470

56 k

15

k

10k

3.3 k 10

k

TOO

22

k

5.6 k

10

k

3.3 k

33 k

T80k

2.2 k

220

39k

3.3k-1%

4.7 k

1.8 k

2.2M -

5%

1 M

10

k

10

k

8.2 k

33 k

8.2 k

120 k

47

k

2.7 k

1 k 47 k 15k

270k 220 k 270 k

68 k

5.6 k 15

k

1.8 k

2.5 k

82µH -5%

0.33W

- 0.25 W

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Oxon0X94QY

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SERVICES

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01844-352554

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ION

PART

NAME

TYPE I REMARKS

Unspezified

carbon

118

w - 5

SPECIFICATIONS NUMBER

film resistor$:

..

Commercial

ORDER

types

IDENTI· FICA

Tl

ON

PART NAME

TYPE I REMARKS

Unspetified

carbon

1/8W

SPECIFICATIONS NUMBER

film resistors;

5%

..

Commercial

ORDER

types

Record Processor

1.077.853

1

2

3

4

5

7

3

~

J

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3

i

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r

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Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor

~

Capacitor

I

i

Capacitor

I Capacitor

;

Capacitor

Capacitor Capacitor Capacitor Capacitor

Capacitor

Ge-

Diode

Si Si

- Diode Diode

Ge Si-

Diode

Si

- Diode

Z-

Diode

Flat - connector

Relay

assembled

tantalum elektrolytic polystyrene

polystyrene polystyrene polystyrene polystyrene tantalum polystyrene

polystyrene polystyrene

polystyrene tantalum tantalum

polyester

elektrolytic tantalum

polyester

polystyrene

polystyrene tantalum

polyester

polyester tantalum

polyester polyester tantalum tantalum

AA

116

1N

914

1N

914

AA

116

1N

914

1N

4448

nF

pF

-

1

nF

-

µF µF -

µF

-

pF

-

µF

-

µF

-

µF µF

V-0.3A

50%-

100%-

50%-

50%50% 20%-160V

100%

20%

20% 20%-160V 20%-

50%20% 20%

5%

10µF22 µF

6.8 nF -

3.9

3.9 nF -

3.3µF-

330

33nF

4.7 riF 10µF lOµF

0.1

47

lOµF -50%-

0.1

150

470pF

lOµF -50%-

22nF-

0.1

0.33

0.1

3.3µFO.lµF-

0.22 µF - 10µF -50%-

3.3µF -50%-

7 .5 v -

24

2%2%2%2%2%-

5%5%1%1%-

- 25V

160V 5%5%-

5%-250V 5%-100V

- 63V

160V

lOOV

- 0.4 w

1.077.853

25V 25V 63V 63V 63V 63V 63V *

16V 25V 25V 63V * 63V

16V

25V 25V 25V

16V

54.02.0320

56.04.0126

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Q Q Q Q

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Q 7 Transistor Q 8 Transistor

Q

Q 10 Transistor

011

R 1 R R 3 R 4 R 5 R 6 R 7 R 8 R 9 R 10 R

11 R 12 R 13 R 14 R15 R 16 R17 R 18 R 19 R 20 R

21

R 22

R 23 R 24 R 25

Filter choke

2

HF - choke

3

HF-

4

1 2 3 4 5 6

9

2

choke Trim - Potentiometer Trim - Potentiometer Trim

- Potentiometer

Transistor Transistor Transistor Transistor Transistor Transistor

Transistor

Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor carbon Resistor Resistor Resistor Resistor Resistor carbon

Filter choke

1

31 18 82 µF 150mH-5% 10k

1 k - 20% - 0.15W

50k - 20% - 0.15W

BC

108 B

BC

178 B

BC

108 B

BC

109 C

2N

5458

BC

109 C

BC

178 B

BC

109 C

BC

109 C

BC

108 B

BC

108 B

carbon

film

carbon

film carbon film carbon film carbon film 270 carbon film carbon film carbon

film carbon film carbon film carbon film carbon film carbon film carbon

film carbon film carbon

film carbon film 3.3 k

film carbon film 1.8 k carbon

film carbon

film carbon film

film

lM

56

5.6 k

2.7 k

5.6

1.8 k 10

10 k

5.6 k

10 k

1.8 k 470 k 220 k

10 k 100

2.7 k

39 k

4.7

2.2 M

1 M

15

15 k

mH -

assembled

mH -

assembled

5%

20%-0.15W

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1.022.133

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16.

17.

-

IO.

11.

8.

9.

12.

13.

14.

15.

Level

oscillator adjustments

Checking the DOLBY

Frequency

Checking the Output Level

Distortion Measurement

Noise weighted/unweighted

Amp

(without

weighted/unweighted

Crosstalk rejection MONO

Crosstalk rejection STEREO Erase Final check

Response

measurement

I ifier noise

tape)

efficiency

and

calibration

off

tape

Depress

button

-6

dB on

Tl

position

"INPUT"

Tl9

Adjust generator

-1

dB

on

both VU-Meters

"REC

CAL" fully Monitor selector Switch "RECORD on Reduce Raise "REC.LEVEL"

ccw#

0

adjust calibration oscillator

Reduce by 20 dB, Turn DOLBY switch position

Frequency

tolerances

Level Attenuation of MPX-filter

Tl Adjust record Measure Level

Measure

Values independent switch position

DOLBY·switch

position

DOLBY-switch position

weighting characteristics (values

Recorder

aH to Tolerances:

Monitor selector As

trimpot between OOLBY IN and DOLBY OUT.

As As MONO-STEREO switch,

track to track transfer, input sensitivity, in pos.

mechanical inspection

potmeters 0/1!)

ccw,

increase

Cl)

to

record

and

LEVEL"

VU-Meter,

Generator

record

level

turn

to

9 generator at 1 kHz

noise

+6

Potmeter

monhor

position

"CAL"

T19 generator level

"IN"

response

difference Mono-Stereo

level

output

level

difference Mono-Stereo

3rd harmonic

</!i)

"IN"

</!i)

"OUT"

as

per ASA in

"PLAY"

readings

vu.

with

Cl)

per

S.M.

6.6.5

..

P305,

if

values

per

S.M.

6.6.6.

per S.M. 6.6.4.

noise

voltage. S/N ratio

"MICRO"(>

9,

to

read

generator level,

in position adjust

to

Level

selector

</!i)

to

0 VU

(radio output l

of

A,

see

mode,

reference

in position

adjust

45 dB)

"TAPE"

read

OdB

fully

and

to

DOLBY

as

per CCIT

additional technical data)

"INPUT"

differ

T19

VU Meter

Generator

VU Meter

Generator

VU-Meter

T19

T 19

T

19

T19

distortion

analyzer

T19

VTVM

1 kHz

30-20000

7.5 50-15000 30-16000

3.75 50-10000 10

18

1 kHz

1.5

7.5

1.5 kHz

3.75

1.5 kHz ovu

7.5

1.5 kHz ovu

3.75

unweighted

3.75

weighted unweighted

7.5 weighted unweighted

3.75

weighted unweighted

7.5 weighted

unweighted

7.5 weighted unweighted

3.75 weighted

Hz + Hz ± 1,5 dB Hz

Hz kHz kHz

kHz

-1

dB

+10dB

OdB

-TO

dB

OdB

-20dB

dB OUTPUT

2/-3

dB

+

2/-3

± 1,5 dB

<0.5dB

-25

dB

1dB Radio

560mV <1

dB

+6

dB

+6

dB

4·track

-53dB

-62dB

-56dB

-65dB

-52dB

-53dB

-55dB

-56dB

>SB

dB >68dB >SB

dB

>64dB

>75dB

OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT

1.5%

2 %

0.5% 1 %

2-track

--64 dB

-67d8

Output

"REC.LEVEL"

"REC.CAL"

P 103 r

Potmeter

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Amplifier Eingangsverstiirker 1.on.700 Amplificateur

d'

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Record Amplifier Aufnahmeverstarker 1.077. Amplificateur d'enregistrement

'<'!',.,

705

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2 Track

2

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2

pistes

approx.

22V/120 kHz

approx.

44V/120

500 mV/120 kHz

50

mV/ 1 kHz•

on

type

and

van

der

Bandsorte

approx. 18V/120 kHz

approx. 36V/120 kHz

kHz

400 mV/120 kHz

40

speed

of

tape; they are

und

der Bandgeschwindigkeit abhiingig

type

et

la

4-

Track

4-Spur

4 pistes

mV/

1 kHz•

to

be

considered nominal.

vitesse

de

la

bande;

Position " Record Position" Position " enregistrement

•

AF

·Test

• NF - Messung ( Oszillator

• Mesure

BF

und

sind deshalb als Rrchtwerte zu

les valeurs indiquees

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Aufnahme

Stereo",

(oscillator pulled

( oscitlateur retin!

sont

nominales.

"'

..

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M

I

",voltages

measured against

Spannungen

",

tensions

full modulation

modulation

Vollaussteuerung

gemessen gegen Masse ( OV)

par

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out),

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Switch Board Schalterprint i.on. 435

Plaquette des commutateurs

--

$peH•10ff

-,

VU

- Meter Board

VU

- Meterprint i.on.480

Plaquette des

VU

- metres

Color Code Farbcode Code des couleurs

=

red-rot-rouge

red

org = orange-orange-orange yel = yellow-gelb-jaune gm = green-griin-vert blu =

blue-blau-bleu

vio = violet-violett-violet brn =

brown-braun-brun

gry = gray-grau-gris

=

black-schwarz-noir

blk

wht = white-weiss-blanc

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Service

MAURITRON

a

Cherry

8

1

10

4

Manuals

Rd,

Chinnor

Contact SERVICES

TECHNICAL

Tree

10

CE:

CHI

8

OxonOX94QY

Tel:·

01844-351694

Email:·

Fax:·

01844-352554

enquiries@maurilron.oo.uk

Record

Relay

FISQI

•OO•

100K

330K

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4,7K

•BM

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R613

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de

mesure:

2

pistes

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plage

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Track approx. 140

Control

Range

ca.

200

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env.

200 mV} a 1

env.

140

mV

de

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la

560

4,1K

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± 7

dB

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kHz

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balance ± 7 dB

OUTPUT

full

modulation

modulation a O dB

Plavback Amplifier

gmFH1

gmFH2

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Commande

du

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Reel

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right

blk

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DF4'

blu CD2

For

Service

MAURITRON

8

Tel:-01844-351694

Email:-

Manuals

TECHNICAL

Cherry

Tree

Oxen OX9 4QY

Fax:-

enquiries@mauritron.co.uk

Contact SERVICES

Rd,

Chinnor

01844·352554

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REPLACEMENT PARTS LIST

The

replacement parts list

is

divided into following columns :

INDEX

QUANTITY

(QTY)

PART NAME

ORDER NUMBER

The

index

number

Take

note

of

the

letters referring

Indicates

The

the

number

short

designation, obligatory,

when writing orders.

Use these

part

numbers only

Note:

All

Orders Must be with

PART NAME.

matches

of

parts

Order

the

one

in

on

all orders.

Number

on

the

illustration

to

said illustration.

the

assembly.

is

to

be

included

and

In·

production changes are

noted

on separate sheets

Red index numbers designate these separate sheets.

Check the separate sheets when ordering, please.

For Service

MAURITRON

8 Cherry Tree

Manuals

TECHNICAL

Rd,

OxonOX94QY

Tel:·01844-351694

Email:·

Fax:·

enquiries@maurilron.co.uk

(e.g.

PL

Contact

SERVICES

Chinner

01844·352554

6a

).

INDEX

QTY

PART

NAME

ORDER

1

NUMBER

1

4

1

1 Cover, voltage selector, with frame

1

4

1

1 Key

Carrying case, assembled

Cover, case, assembled Side, left, with loudspeaker Side, right, with loudspeaker

Loudspeakers

Handle, carrying, assembled Fastener, handle

Cover, plastic Cover, plastic " air access " Support, rubber, case fastening

Lock

Case lock

11

connections

11

1.077.831

1.077.834

1.077.832

1.077.833

71. 01.0102

1.077.805

1.077.800.

1.077.806

1.077.800-

1.077 .800 . 06

1.077 .800 . 20

33. 01.0104

33. 01.0106

08

01

Fastenings, carrying case

4 Screw, sheet metal 4 Washer 4

1

2 Rail, plastic, less feet

4

4 4

1 Disconnecter, protectiv

1 3 4

Foot, case

Cabinet, walnut, assembled

Feet, for vertical operation

Foot, rubber

Fastenings, walnut cabinet

Screw, sheet metal Washer

Installation unit, sheet metal incl. fasteners Fastener

Screw, sheet metal

20. 21.7311

23. 01.3043

1.077 .831 . 02

1.077.800

1.077 .800 . 03

1.077 .800 - 04

20. 21.7310

1.010.007 . 23

1.077.845

1.077.840

1.040.255

20. 21.7308

1

Cover, plexiglass

1.077.860.

01

I.

___

~:

A

10

J

10--1

l---oa

+.

I

09

04

01

06

10-----El

07--~

oa---J

09---

0

11

1

10

For

MAURITRON

Tel:·

Email:-

Service

Manuals

8

TECHNICAL

Cherry

Tree

Rd,

Oxon

01844-351694

enquiries@mauritron.co.uk

Chinnor

OX94QY

Fax:-

01844-352554

Contact

SERVICES

05

B

--~

OJ____

-

P@i~@

@

ff!--1--

@e

L.O

-

1

I

; !

m

0

i.

I I

L.O

....

tl

I

'LJ~l~©

__

<ll

;___j__

©

~

co

0

L.O

,....

L.O

0

""'"

•

co

0

0)

0

co

0

U'l

,....

INDEX

QTY

c Switch, Power

PART

NAME

ORDER

NUMBER

01

02

03 04 05 06 07

08 1

09 10 11 12 13 14 15

16

17

18

1

Switch, power, assembled

1 Micro-switch ( tape tension I 2 2 4

Rivet, tubular Micro-switch ( line ) Bushing, insulation

1 Foil, insulation

2 Spring, flat

Ball

2 Bearing, plastic 4

1 1 1

2 Ring, retaining 0 2.3

1 1 1

Clip, retaining 0 4 Cam, switch

mm

(white plastic ) with bushing Lever Bearing

mm Washer, tap, hard paper Stop

(turn

limiting)

Bar

1 Link, connecting

For

Service

MAURITRON

8 Cherry Tree

Tel:·

01844·351694

Email:·

Manuals

TECHNICAL

Rd,

Oxon

OX94QY

Fax:-

llllQUiries@mauritron.co.uk

Contact

SERVICES

Chinnor

01844-352554

1.077.440

55. 01.0124

28. 21.1415

55. 01.0125

1.077.440 -

1.077.440 -05

1.077.440- 03

41. 01.0160

1.077.450 -04

24. 16.3040

1.077.450

1.077.460

1.077.455

24. 16.3023

1.077.440 -

1.077.445 -02

1.077 .430 - 04

1.077.430 -

08

04

03

Rail, Connector

01

1

Rail, connector, with power cable and remote control cabling

02 1 Enclosure, protective disconnector 03

04

1 Socket, instrument

3 Socket, twin, Cinch

05 2 Socket, loudspeaker 06 1 Socket, 5 - pole 07 08

1 1

Socket,

10-

Plug, dummy, remote control, assembled

pole,

RAD

I 0

REMOTE

CONTROL

1.077.550

1.077.555

54. 04.0103

54. 02.0293

54. 02.0301

54. 02.0310

54. 02.0315

1.077.570

10

04---1,---~~

04

----4-=-----r:

09

11

14

12

13 14

17

c

1

l

I

D

05 05 08

For

Service

MAUAITRON

8

Tel:-01844-351694

Email:·

Manuals

TECHNICAL

Cherry

Tree

Oxon0X94QY

Fax:-0.1844-352554

enquiries@maurilron.co.uk

Rd,

Chinnor

01

Contact

SERVICES

07

01

04

06

04

05 05 08

PL

5

INDEX

QTY

PART

NAME

ORDER NUMBER

E

01

02

03 04

05

06 07 08

09

10 1

11 12 13 14 15 1 16

17

18 1 19

20

21

22

23 2 Housing, shield,

24 25

26 27

28

29

30

31

32

33

1 4 2

2

4

1 Post, tape guide 2

1 l

2

1

1 1

1

1 Base plate, assembled ( 2 - hole head-fastening)

1

2 2 Housing, shield, int ( 2 · hole head·fastening )

2 Housing, shield, int

1 1 1 1 Head, playback, 2 - track, ( 1 - hole head-fastening I 1 1 Head, record, 2 · track, 1 Head, record, 4 • track, 1 1 Head, record, 4 • track,

1 1 1 Shim, 4 - track head 1

Drive, Tape & Headblock

Chassis, cast, tape drive, with pressure lever Cup, tape guide Collar, tape guide

Bushing, threaded

Screw M 4 x8

Screw M 3 x 8 21. Guide, tape, assembled

Bracket, assembly Spring, compression Disc, guide Sleeve, spacer Nut, hex M 3

Lever, tape lift, assembled Screw, Washer Bracket

Socket, lamp 53. 04.0102

Base plate, assembled ( 1 - hole head·fastening )

Housing, shield,

Lid, shield, playback head, assembled Head, playback, 2 • track, { 2 - hole head-fastening ) Head, playback, 4 - track, ( 2 - hole head-fastening I

Head, playback, 4 - track, ( 1 - hole head-fastening I

Head, record, 2 · track,

Head, erase, 2 - track Head, erase, 4 · track

0.1 mm shim, brass for elevation adjustment

spec

Lamp ( 24

Resistor, photoelectric ( end·of-tape switch ) 1.077.135

V,

30

mA ),

( 2

·hole

ext

( 1 - hole head-fastening )

ext

( 1 · hole head-fastening )

head-fastening )

( 2 · hole head-fastening I

( 2 • hole head-fastening ) ( 1 - hole head-fastening ) ( 1 · hole head-fastening )

sintered bearings

of

erase head

1.077.125

1. 736.222 .

1.

736.222 .

1.077 .120 .

21. 01.0455

1.077.120.

01.0355

1.077.145

1.077.150

1.077 .145 -

1.077.145 -

1.077.145.

22. 01.5030

1.077.175

1.077.120-

1.077.120.

1.077.133

51. 02.0140

1.077.156

1.077.157

1.077.155.

1.077.155-05

1.077.155.

1.077.165

1.116.026

1.116.046

1.116.027

1.116.047

1.116.021

1.116.041

1.116.022

1.116.042

89. 01.0301

89. 01.0302

1.077.131

1.010.006.

04 05 02

01

I

03 01 02

'

03 04

I I

03

04 06

-01 23

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