Ampro 745 Career User manual

PnoToFACT*

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AMPRO

MODET 745

"Coreer"

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GENERAL

INFORMATION

The Ampro

Model

745 is

designed

to record

and

play

back two

tracks of material

on

standard

width recording

tape, which doubles

the

playing

time of a reel

of tape with no loss

of

frequency

response

or

quality.

Recordings

can

be

made from a

radio,

television receiver

or

phonograph,

in

addition

to

those made directly

from

the

microphone.

Recordings

can

be

played

backthroughthe

self-contained

speaker or an

external

speaker

through

use

of the Speaker

Jack.

The

Model'745

has

two

tape speeds,

3

3/ 4"

and ? I/2"

per

second.

Using

both

tracks

of

the

tape

the recording

time

is as

follows.

Size

Reel 3

3/ 4"

Speed

5" reel

(600

ft.

)

I hour

7" reel

(1200

ft.

)

2 hours

7 I/ 2"

Speed

/2

hour

I hour

This unit is

designed

to operate

on 60

cycie, 115

volt,

AC

supply

only.

Before

connecting

to

your

line

supply,

be absolutely

certain

that it agrees

with

the above

specifications.

Manufactured

by:

Ampro

Corporation

1345

Diversey

Parkway

Chicago

14,

Illinois

fhis molerial

compiled

ond

published

by

5AM5

& CO.,

lNc.,

INDIANAPOLIS,

.

0ATE

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50

INDIANA

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I

OP

ERATING INSTRUC

TIONS

Prepartion

For Operation-

1.

Remove the

AC

power

cord

5"

reel of tape,

empty reel

and microphone from

the

rear storage

compartment.

2. Plug

the

AC

cord into a

convenient

wall

recep-

tacle

of the

proper

rating.

3.

Be sure the Play-Stop-Rewind

control

is

in

I'stop"

position

and

the

Play-Record

control is in

"playt'

position,

Speed

Change

Knob-

Select tape

speed

with the unit on. Moving switch

upwardwill

cause the

unit

to

play

at the speed of

3.

75,

movingswitchdownwardtheunit

will

play

at

a

speed

of

?.50.

For maximum

tape

economy

or

for recording

the

spoken

voice,

3. ?5 I.

P.

S.

is

suggested. The

best

for music

and maximum fidelity is

the

speed

of

?.

50

I.

P. S.

Threading

The Tape-

1.

Place a full reel of

tape

on

the

left

(supply)

spindle

(37),

makingcertainone

of the reel slots catch

the

protrusions

of the

pan.

Unwind about

14't of tape

from

the

supply reel.

2. Insert

free section of

tape

into the tape

slot.

Page 2

3.

Insert free end of

tape

into

one of the

three

slots

in the hub of

the

right

(take-up)

reel and while

holding the tape

in

place

give

the

reel

two or

three

turns

until

the tape

is secured.

4. The dull side

of

the

tape should

always face

away from

the operator

(rear

of unit).

To

Record

From

Microphone-

1.

Turn

the On-Off

Volume

control

to the

right

until a click

is

heard and allow about 30 seconds for

the unit

to warm up.

2. Insert

the microphone

plug

into the

"Micro-

phone"

input.

3.

Press down

"Safety

Buttonil

and

turn

Play-

Record

control

to

"Mic.

Recordil

position.

4. Adjust

the

'"V'olumet'

control until the

Record

Level

Eye,

greenrays

almost meet

on

loudest sounds,

recording level is

perfect

at this

point.

5.

The

"Tone"

control does

not

operate

during

recording. When

recording

from radio, set the

radio

"Tone"

control for maximum treble.

ToRecoriFromExternal

Radio.

TV.

Or

Phonograph-

1.

You may record directlyfrom the

speaker by

using

the

special

radio-phono connection

cord,

avail-

ableasaccessoryNo.

108.

(This

cord

has a

telephone-

type

jack

at one end, andtwo metal clips at the

other).

Figure

2

2.

Attach

one

clip

to

the ungrounded side of the

sired

listening level.

radio,

TV

or

phono

speaker

coil.

The

other

clip is

attached

to the

grounded

side

of the coil.

6. To stop,

return

Play-Stop-Rewind lever

to

t'Stopt'.

3. Plug

the Jack

into

the

receptacle on

side

of

your

unit marked

I'Mic

or

Phono,

r'

and

proceed

as

Fast

Forward

Tape

Advance-

described

under

"To

Record From Microphoner'.

1. Leave Play-Stop-Rewind

lever

in

ilStopil

po-

NOTE;

Remove

patch

cord

after

recording

is

com-

sition.

pleted.

To

Use

Second

Track-

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1. Move Play

or Record-Stop-Rewind

lever

to

the

"Stop"

position

when all

the tape

has wound

onto

the

take-up reel.

2.

Remove reel

containing tape and

place

on

left-hand

supply spindle.

3.

Place empty

reel

on

right-hand take-up

spindle.

4. Thread

tape

as

previously

described.

To

Play

Recordings-

1.

Turn

on

unit

with

"Volume"

control

knob.

2.

Thread

tape

as

described

under

ilThreading

The

Tape.

3. Set

the speed change knob

(tA)to

the

speed

at

which

the recording was

made.

4.

Turn Play-Stop-Rewind lever

to

play.

5.

Adjust

"Volumef'

and

"Toneil

controls to de-

2.

Hold down

"Fast

Forward

Buttont'

(6)

on

top

of

right

reel

spindte

(?).

3.

Release

when tape

has advanced to

location

on the tape

you

wish

to

hear

or

record.

To Rewind-

1.

Before rewinding, return Play-Record con-

trol

to

"Play"

position.

2. Turn Play-Rewind

lever

to

"rewindr'.

Re-

wind tape to beginning

of

your

recording and

return

lever to

stop.

To Edit

And

Splice Tape-

NOTE: Since it

is impossible

to

edit and splice one

track without affecting

the

other, recordings

which are

to be

edited should be

limited

to

one track only.

1. The

tape

maybe

editedby cutting

out unwanted

portions,

or

joining

selections into another

sequence"

Announcements may

be

inserted

between

selections,

etc. Unused

sections

of tape can be

spliced together

for

re-use.

Page

3

2.

Forbestresults,

cuttape

at a slight diagonal,

join

ends

together

with splicing

tape on

the

glossy

side

and

trim

off any excessive

width.

E

rasing

Recorded

Material-

When

the Play-Record knob

(3)

is in

the

"Record"

position,

the erase head

is automatically

in operation,

erasing

any

before a new one is

made.

You may

erase material

no longer needed,

without

recording,

by

moving

the

Play-Record knob

(3)

to

"Record"

on turning

the

"Volume"

control

knob

to

the minimum

volume

position

just

before the record-

er shuts

off.

Onetrack

is erased

at a time, To

erase

the second

track, reverse the reels and repeat the

above

operation.

To

Use Recorder

As A Public Address

System-

Plug microphone cord into

I'Mic.

or Phonoil

re-

ceptacle. Turn Play-Record controlto

I'phono-record"

position.

Be

sure microphone is far enough away

from

speaker

to avoid

feedback squeal. Volume may be ad-

justed

with Volume

eontrol.

Mikeand/or radio-phono

can

be

simultaneously

used

for

blending of

special

effects in

public

address use with

Ampro Dual

-

Input

Mixer,

No. 133.

ELECTRICAL

ADJUSTMENTS

Erase

Head Adjustment-

I, Loosen

screws located

on the left

side

of

erase

head

and raise or lower head and

tilt

head

as

required

in

order to obtain minimum

output.

2.

Then loosen

screw

(32A)

and rotate

position-

ing

block for minimum

output.

3.

Tighten screw

(32A)

and rotate

positioning

block for

minimum output.

4,

Checkfor oppositetrackerasure

if excessive,

head

is set

too

low.

Record Head Adjustment-

The record

head is mounted

on a

pivoted

plate

which is held

in

place

by

two

filister head

screws

(32B)

located at opposite corners

of the

plate.

Tight-

ening or loosening

the screw on the

left

(viewed

from

operating

position)

rocks the

pivoted

plate

thereby

changing the

angular relationship between

the

gap

and

thetapeand increasing

or decreasing

the compression

oI

the

spring located under the

head

of

the opposite

mounting screw. In order to

make an adjustment,

threadtherecorder with

pre-recorded

1

mil

alignment

tape or a

good

recorded tape

on

the

machine.

Connect an

output meter

across the terminals

of

the elliptical

speaker. Switch

recorder to

"play"

po-

sition and set the volume control

to the

12 o'clock

po-

sition.

Rotate

the

screw which secures

the

left side

of

the

plate

in order

to obtain

maximum output

from

the

pre-recorded

material.

Make a

rough adjustment

at a tape velocityof

3. ?5 inches

per

second

the

switch

to

?.50 inches

per

second for final

adjustment.

NOTE:

Watch

out for a false

peak you

may

find 3

peaks

-

be

sure to

adjust for

strongest

peak.

Page

4

Erase Current-

Disconnect the

ground

lead at

the erase head

terminal

and insert a 10

ohm

non-inductive

resistor.

Qonnect

a

VTVM

across

the resistor.

Switch

to

record

and note

voltage.

Correct

voltage will

be

ap-

proximately

0,4-0.

5 volts indicating an erase current

of approximately 40-50

ma.

Bias Current-

Disconnect lead from record

head. Insert 100

ohm

non-inductive resistor between red

lead and re-

cord

head

terminal

and

connect

VTVM acrossl00

ohm

resistor.

Turnvolume control to

low volume

position.

Switchtorecord

and

measure

voltage

across resistor.

Voltage

shouldbe

"0.40

-

0,45" volts which

is equiva-

lent to

a current of

"0.40

-

0.45 ma. If bias

is not

within

these

limits adjust slug in

oscillator

coil to

obtain correct current.

MECHANICAL ADJUSTMENTS

Erase

Interlock

Cam Adjustment-

l. Loosen

set screw slightly so

that

cam

(34)

can be turned on control shajt.

2. Turn

shaft to maximum

clockwise

t'Playt'

position.

Rotate

cam

so

that

flat surface is

parallel

to

edge

of

interlock

spring

(35).

3. Press in

on

interlock

spring, then

turn

con-

trol

shaft in

order to expose setscrew.

Tighten set-

screws.

Rewind-Play Or Record Cam

(29)

Adjustment-

1. Turn

control shaJt

to

maximum

counter-

clockwise

(Play

or Record)

position.

2. Loosen setscrews

in cam. Rotate cam so

thatcamflatis

parallel

to flat surface of

pad

actuating

arm

(24).

3.

Raise or lower

cam

(29)

as required

in

order

to locate top face

of cam

in

the same

plane

as top of

arm

(24).

Tighten setscrews.

4. Place light

film

of

"Lubriplate"

on surface

of cam

which comes

in contact with arm

(24).

Disassembly

Instructions-

1.

Take outthe four Phillips

filister head screws

located at

the corners of

the

panel

(5).

Loosenthetwo

allen

setscrews

in the

"Rewind-Play

or Recordl knob

(3)

and remove

the knob.

Puli off the other three

knobs

(2).

Lift

off the

control

panel (5).

2. Removethreephillipsoval

head screws which

hold speed

change control cover

(l)

in

place

and lift

off

cover.

3. Take

out ten

phillips

oval

head wood screws

which

hold metal

panels

to

case.

4.

Loosen

cable

clamp which

holds line

cord

to

back of carrying case. Standrecorder on end and

pull

mechanism

out of case.

Takeup Brake

Adjustment-

Place

"Rewind-Play

or Recordtt

knob

in

[Playtt

t-

0

Figure

position.

Loosen

locknut

on adjustment screw

(19A)

andturn

screwto

provide

a

clearance

of

I/ 64"

between

shoe

(19)

and tire

(8).

Tighten locknut.

Feed

Spindle

Brake

Adjustment-

Place

t'Rewind-Play

or Record"

knob

(2)

in

"Play"

position.

Loosen

double nuts at

end

of

brake

rod

(48).

Adjust

nuts

to

provide

a

clearance of

L/ 32"

between

shoe

(67)

and

tire

(?0).

Rotate feed

spindle

and

check

to

make

sure that eccentricity,

if

present,

does

not

reduce

clearance

below minimum

value of

L/

32".

Tighten locking

nut.

Instant

Stop

Link-

Set inner nut

of link

(14)

L

5/ 32* from end

of

link

(14).

Set

outer

nut flush

with end

of

tink.

Rewind

Adjustment-

Place

"Rewind-P1ay

or

Recordil knob in

ftPlaytt

position.

Loosen

double nuts

at

end of

pushrod

(30).

Adjust

nuts

to

provide

a clearance

of L/ 64 between

rewind

drive

belt

(ab)

and knurled

section

of

drum

(69).

NOTE:

If

rewind does not function

properly,

and

the

rewind

belt

(45)

is not

damaged, the trouble

is

probably

due

to

excessive

take-up tension.

Takeup

Adjustment

1.

Cement 8-10" of tape or string

to

the hub of

a ?"

reel. Place reel

on takeup

spindle and hook

a

spring

balance scale

(0-8

oz.

or

0-16

oz) to the

loose

end

of the

tape

or spring.

Switch

recorder

to

trplayrr

3

measure the

takeup

tension-'correct

tension should be

l/2toLoz.

2. lf.

takeup tensions are

incorrect, remove

recorder

from

case. Loosen

two

setscrews

which

hold the

intermediate

drive

putley

(47)

to takeup drive

spindle

and

pull

out spindle assembly.

3.

Grasp the spindle

by the

shank

(9),

hold

spindle

in

a vertical

position

with the reel drive

pins

on top.

Hook

the spring

balance

scale

to one of the

reel

drive

pins

and

pull

along a line

as

a

right angle

to a

line

thru the center

of the

spindle

post

and

pin.

The

"breakaway"tensionrequired

to

rotate

the

spindle

should be

3

to 5

oz.

In

order

to

adjust

t}re tension,

invert the spindle and

insert

the ends of the

jaws

of

a

pair

of

longnose

pliers

into

the

two

holes

in

the

clutch

pressure plate (12).

Turn

the

plate

to the right to

increase the

tension.

NOTE: Thisadjustment

is sensitive

when making ad-

justment,

do not

turn

the

plate

more

than the

width

of one of

the

holes

between

tests.

TROUBLES

Whining Or Scrapping Noise-

1.

The recorder

is shifted in

the case, the bottom

end of the

motor

shaft rubs against

the

guide

sleeve

in

the

bottom cover and

produces

the noise.

2.

Reposition the mechanism

in

the case

and

tightenthe

retaining screws.

If theholes in the

support

blocks

are damaged, the

best

way to make a

permanent

repairisto inject

plastic

wood into

the

hold

before

in-

serting the screws.

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Page 5

A PHOTOFACT

"EXPLODED"

VIEW

O

Howard

W.

Sams

& Co',

lnc'

1956

Figure

4A.

Exploded

View Of

Parts

Above

Baseplate.

Page

6

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{

A

PHOTOFACT

"EXPLODED"

VIEW

@

Howard

W Sams &

Co., lnc.

1956

Figure 48. Exploded

View

Of

Parts

Below

Baseplate.

Page

?

Fails

To Record-

l.

Tapepressurepads

(25)

notadjusted

properly,

resulting

in

thetapenot being held against

the

record-

ing head.

See

"Rewind

-

Play Or

Record Cam

Adjust-

mgntt'.

2.

Check the recording tape

to

see if the dull

coated side faces inward

on the reel. If

the

dull side

faces

outward a recording

cannot be made.

Tape

Overruns

Or Spills When Knob

(3)

Is Turned To

Stop, During

Rewind Or Fast Forward-

l.

Brake

shoes

out of adjustment. See

Takeup

and Feed

Reel Brale

Adjustments.

2.

Rods

(30

and 48) loose are not

adjusted

properly.

Speed

Variation Or Wow-

1. Check

the

capstan

(52),

pineh

roller

(15),

motor

pulley

(55),

and ftywheel

(52)

for oil or

foreign

material

on their

driving surfaces. Clean these

parts

witl a

good

cleaning

fluid.

2.

Checkmotorpulley(55) to see if it is

secured

to motor shaJt.

3. Flatspoton

rubber roller

(15)

not smooth and

even, replace

part.

4. Pressure

Pad assembly

(24)

applyingtoo

much

pressure

against

tape. Check adjustment

under

'Rewind-Play

Or Record Cam

(29)

Adjustment.

rt

Incorreet

Indexing

Of

Function Knob

(2)-

l. The

control

knob

(2)

is

in Play

position

the

safety

interlock

button

(5A)

prevents

the shaft

from

turning.

2. If

the operator forces

the

knob,

thereafter,

it will not

index correctly.

3. Pull

of the knob and drive down a wedge,

tlereby

expanding

the

shaft,

then

place

the knob in

the

proper

position

and

push

down

onto the shaft.

No

Drive In Fast Forward-

1.

Belt

(46)

loose

or broken, thereby when button

(6)

is depressed

fast forward is in-operative.

2.

When button

is

depressed the

felt

clutch

(11)

does

not make contact, adjust takeup as described

under

"Tal<eup

Adjustmentr'.

No Rewind-

1.

Rewind belt

(45)

broken

or loose.

2.

Push rod

(30)

not

properly

adjusted, check

adjustment under'Bewind Adjustment".

3. No

Rewind can be caused byexcessive

takeup

tension.

See

"Takeup

Adjustment".

Speed Change

Knob Fails To Change Speed-

1.

Setscrews

in speed change

lever

(76)

loose

causing

lever to move on shaft,

2.

Belt shifter

(54)

notadjustedproperly. Check

to see that

shifter moves

belt

(53)

up

and down on

pulley

(55).

Erase Current

Too Low-

l.

Some 6AQb tubes

did not deliver

full

output

as

oscillators.

The

cathode

resistor was changed

from

1500

ohms

to

1200

ohms

in

order toinsure satisfactory

output

from all tubes.

MAINTENANCE

Cleaning

The Play-Record Head-

The

play-record

head is

subject

to an

accumu-

lation of tape coating

residue which is worn off the

tape

as it

passes

the head. This shouldbeperiodically

removed

since it may cause faint recordings

and

poor

playback.

Wipe off the record head contact

surfaces

carefully

with a clean cloth. If dirt is

caked

or hard

and

will not come off with a dry cloth, dampen the

cloth

slightly with water.

NOTE: Do

not

use a

brush

or excessive amount of

water on

the

head surface.

LUBRICATION

All rotating

parts

are

provided

with

generous

size

oilite bearings,

which are factory

lubricated and

require

no

further attention,

An occasional cleaning

out

of

foreign matter

under the

plastic

cover

(5)

is

desirable.

Page

8

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PAGE II

Description

7

8

I

10

1l

L2

l3

I{

15

16

L7

18

19

20

2t

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

75636

-2

74612

?4631

?4614

-1

74206

Speed Change

Cover

Speed

Change

Knob

Control Knob

Record

-

Play

-

Stop-Rewind

Rear Plate

Front

Escutcheon

Safety

Button

Fast

Forward

Button

Take-Up

Spindle

"O"

Ring

Take-Up

Drive

Hub Drum

Fast

Forward Actuating

Shaft

Felt Clutch

Adjusting

Disc

Pivot Arm

Pull

Rod

Pinch

Roller

Assy.

Instant

Stop Arm

Spring

Instant

Stop Arm

Instant

Stop Arm Pivot

Take-Up

Brake Arm

Take-Up

Brake

Arm

Spring

Take-Up Mounting

Plate

Baseplate

Screw

Pad Actuating

Arm

Head

Pressure

Pads

Pad Actuating

Arm

Spring

Pad Actuating

Arm

Pivot

Pinch

Roller

Spring

Play-Record

Cam

Push

Rod

Recording

Head

Erase Head

Escutcheon

Support

Erase

Interlock

Cam

Interlock

Spring

Rewind

Driver Arm

Rewind

Spindle

Rewind

Mountins

Plate

39

40

4T

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

5?

58

59

60

61

62

63

64

65

66

6?

68

69

70

7I

72

73

74

75

76

77

L PARTS

16403

Capstan

Bearing

& Housing

Instant

Stop

Bel1

Crank

& Link

Spring

Rewind

Brake Actuating

Lever

Rewind

Drive

Belt

Forward

Drive

Belt

Intermediate

Reel

Drive

Pulley

Rewind

Brake Push

Rod

"Cil

Retainer

Flywheel

Support

Bracket

Vertical

Position

Screw

Flywheel

& Capstan

Drive

Belt

Shifter

Motor

Pulley

Brake Release

Arm

Screw

Washer

Motor

Mounting

Shoeks

Rubber

Washer

Spacer

Motor

Mounting

Bracket

Motor

Mounting

Plate

Motor

Fan

Spring

Supply Spindle

Brake

Brake Spring

Rewind

Brake Drum

"Ot'Ring

Rewind

Pulley

IdIer

Pulley

Idler Arm

IdIer

Spring

Speed

Shifter Stop

Speed

Change Lever

Steel

Ball

Capstan Support

Page

12

Figure

5

Ampro 745 Career User manual

Ampro 745 Career User manual

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