Akai 1700 Service manual

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AKAI TAPE
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IASTE OF

CONTENTS

spEctFtcAnoNs..

I

HOW TO A.TEASURE DESIGNATED VALUES

I

SPEC|F|CAT|ONS..,......

tocafloN oF coNlRor.s

I

DrsAssEMrLy

IV

AND AMPL|F|ERS.........

TRANSPORI

v

ADJUSTMENT

IJ

ADJUSTMENT

II

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r,{A|NTENANCE

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n
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or
ExpLoDED vtEw
TROU3LESHOOTTNG
scHEfiATtC DTAGRAM
CoNNECTING DfAGRAl.r

oF tApE TRANSPoRT uNtTs

MECHAN|SL

TAPE TRANSPORT

OF

al4pr|FrER

oF

pRocEDURES .. ............. .............It

REPLACEI

ENT

oF coMpoNENt

..... . ..........................,

... .................... .............'10

pARTs....................................12

CHART

.,.....,............, ..'.................25

................,..............,.21

...................-..--.-.-.-......-.26

.. ...'.....'......

OF

..............'

I

2

3

...... ... ...

.......... .....

................."..

UNIT

p^RTs............ ......,.1,4

,l
6
9

SPECIFICATIONS

MODEL

NUMBER

wtrGHT

(NET

IN CARTON)

DIMENSIONS

POWER RE-

qUIREMENTS

POWER CON.

SUMPTION

RECORDINC

SYSTEM:

PLAYBACK

SYSTEM:

TAPE SPEED

.I'APE

SPEED

DEVIATION

WOW AND

FLUTTER

FAST FORWARD

AND

REWIND

TIME

Akai Modcl 1700, portablc 4-track
st.rco tape rccorder.

(15

33 lbs

t3-t6'

kg) without acccssorics.

x 13-%'

lH)

(w)

x 9'

(Dl

A. C. 100, ll0, 120,200,220 or 240 volts
interchang€abl€. 50 60cycles.

80VA.

Inline 4 t.ack st€reo and 4-tfack mon-

Inlin€ 4.tiack stefeo, monaural play-

Thrce speeds

:

cml and l-%"
p€r

s€cond

capstan and pinch whe€I.)

than + 3

Less

:

Less than 0.2 % at 7-t6 ips. R.M.S.

:

(a.is

cmJ per second.

with an optional accessory

pef cent at all

Less than 0.3 % at 3-7a ips. R.M.S.
Less than 0.45 % at l-16 ips. R.M.S.

150 seconds fof 1,200 ft. tapc at 50

and 120

cles

s€conds at 60 cyclcs.

case

(15"

tape

cy-

POWJ]R

INPU'I'

LDVELS:

POWDR

OUTPUT:

INSULATION

RESISTANCE

INSULATION

YI[,LD

STRENGTH

MONITORINC

SYSTEM

MOTOR

HEADS

MICROPHONE

USED :

Microphone

-55

db

Phono

40 db

Pre-Amplifier
cps, impedanc€
Main output,34dbm.

More than

More

With headphor€

Condenser

l/l00HP.

2,900

to I,450

3,480 to 1,740
lnline +tf ack

play h€ad
Impedance..
I,000

cps.
4-track
Imp€danc€.

Round

Impedance...50,000ohms
S€Dsit;vity...
f.€quency

ir)put lcvcl

(VR.

max.jat

and radio

(VR.

max.)at l,000cps.

output, 0.7V at

50MEC ohns.

than

ore m;nute at A.C.

start;ng

Power

r.p.m. at 50
r.p.m.

stereo/monau.al

;

.3,500

erase head

. .4,000 ohms

dynamic micropho.e

R€rpoDse...70

l,000cps.

input levcl

more than

up

during reco.ding.

induction two-

factor,70

at 60 cps.

ohms + l0

;

55 db.

1,000

l00K

ohms.

(in

600ohmt.

1,000V.

pe.

cent.

cps,

record-

%

+15% at 90

ro 15,000

zt

FRDqUENCY

RDSPONStr

DISTORT'ION

SIGNAL-TO-

NOISE RATIO

CROSS TALK
CHANNEL

SEPARATION

40 to 18,000cps. at 7-%;ps;

.L 3 db.80
+ 3 db. 80

4 db. 80 at 4,000cps.

+

Within 4%at l,000cps,oVU

40 db below rccorded lev€lsignal

Within 55db

Better than

to

12,000 cps. at 7-l,

to 10,000cps.

between each trach.

80 db at l,000cps

at 3-3la;ps;
at l-7s ips.

ipsj

+3

ltotal

at all

VU.

SPEAKOR

INCLUDED:

TUBES USED
SILICON

DIODE

REELS

USED:

USED :

RECORDING

LEVEL

INDICATOR

Two 5'x7'

Imp€dance...8
Allowable IDput...6
Frequency
cps,

l0db.

:!

I2AT7

:

: Horizontal,

x2, 6BM8x2.

l50Dx2

Up to 7'

r€el

A-model

dynahic

R€sponse...8o

speakers.

ohms

warts

VU m€te..

ro

12,000

1I

IIOW

NIICNSURE

TO

DESIGNATED

VALUES

SPECIFICATIONS

OF

TAI'I] SPDtrD

DEVIATION

Reco.d

:

the tap€
a standa.d
351A,
fccted
tlrroughout

tape.
tapc recorder
back, and
couDte.,
rating

the tape speed dcviatior.
Fo.
spe€d deviation
with a testing

the l,000cps.

speed

sound

for instance)

by lhe

the

th;s standard

Put

unde.

nreasure

codvert

then

power

a rough

frequeDcy

measurement,

tape for

at rating

tape sPecd

can also

recorder

which

whole

test

its

curve

sine

sp€eds

(AMPEX

is little

deviation

i€ngth

thc value

speed by

of the

on

taPe

for playing

outPut

to cvaluate

the

be measured

astop

of

with

af-

th€

bY a

into

taPe

TOTAL HARMONIC
DISTORTION

FACTOR:

Provide
,ecord.r
signals and
recording
recorder's
Then
no.mal recording
u.c the distortion
lator.

from
lcvelon
€d dhtortion
formula:
d0:d-dl d2

the input

with 1.000.ps.

.ecord
tape at
VU mete.

playback

Remove

the recorder,

the oscjllator

d0..required
d...overall
dl...noise
d2...disto.tion

to.

the siSnals

factor

distortion

l€vel

uscd

terminal

':nF ,

these signals on

the zero level

under the

condit;on

factor

the recording

then read the

to

by the following

factor of

to meas-

by an oscil

the requ;r-

8ct

factor

the oscilla-

ol the

urvF

a

on the

tapc

noisc

\{OW

AND

FLUTTER

}.RLqUI]NCY

RESPONSE:

(OVI]RALL

I'REqUENCY

RESPONSE)

Playback

:

that guarante€s

p€r cent,

h 0.07

otr wow

valuc

the sedsibility

Since
tcr frequency
5 cps. d.ops,

is put
frequency
OCT circuit
justed

to 3db/OCT

value is

Connccr

rcco.dcr,

f.equency

Audio
Adjusl toDe

the tape
aL€r out
response

to

frequency Oscillator.

by .onnectidg
put then read

thc 3,000cps

wo\d and flutter

aid read

mere.

of

2cps

bclow

the frequency

circuit,

bclow 2.ps.

for adjustment

called

thc input

.ccord a sine

at 100 cps

volume

to adjusl a

to

maximum

sianda.d

the effect;ve

wow and flut-

is put

auditory com-

tcdninal of

curve swecp

-10

flat,

VTVM

the frequency

tape

with-

and above
over 5cps.

th€

and
to 6db/
This ad-

from

db.

playback

tosp€-

devia'

the

SICNAL

TO
NOISE: Playback

OUTPUT:

CROSS

TALK:

the sine curve,
rccorded on a
th€ reco.der
Removc
noisc level under
Calculate

in d€cibel.

I'layback

curvc tape

sine

the zero VU

at

recorder.
with

€ight
Square
vide the figure
thc r.m.s.

Record 1,000 cps.
the
signal
Filter.
Compare
in decibels.

the voltag€

third tack, then playback

through a

standard recorder

to measur€

the taPe, then measure

the same condition

the ratio between

on the recorder

which

level on a standard

T€rDinatc the

ohms.

rcading, then di

by eight ohms

output.

Powcr

signal at

l,000cps. Band

the output

250 cPS.

the voltag€

thc 1,000 cps.

was

test recorder

of tracks I and

tape

on

the

the two

record€d

to get

+3VU

this

Pass

on

3

2-

LOCATION OF CONTROLS

I

f

Supply

o

Cyclc

o

Capstan storage

0

@
@

Tape

o

trras€

o

@

Right channel volumc control

o

Right channel

@

Left channcl

o

Right channel

Left channel

@

Left channel

@

Speed

Take-up reel shaft

@

Capstan

(D

Pinch

(D

Automatic stop lever
Record/Play switch

@

rccl shaft

convcrsion switch

post

guide

head

tonc control

microphone

microphone input
volumc cont.ol
tone control

change switch

shaft

wheel

@

input

jack

jack

Rewind/FasFforward switch
Record safety button
Automatic
Stereo headphonejack
VU

@

stop switch

h€ter

conv€rsion switch

@

Track s€lector switch

@

(D

Cycle conversion sw;tch

Hum adjust

(D

Speaker output
Speaker output
Voltage

Preamp output

Preamp output

o

Phono/Radio input

@

Hun

@

Phono/Radio input

o

(right)

jack (righr)
jack

sele.tor switch

jack (right)
jack

(left)

adjust

llert)

{left)

jack (l€ft

jack

(rish0

3

DISASSEMBLY

I\I

OF TAPE TRANSPORT

UNITS

& AMPLIFIERS

ll l-oo!',, rh. lt l:.1.\ I\ lN(;

LI{l , ,lt-'.. ,\vl,v ," !i

ih. l'IN(ill lt()l.l.l lt

SUIlll\f

llil.

I'INCIt R()L-

irlof

L,{iJ.!

13)
r.!!^! l)1'lCK

thc S(lltli\\'S

l).\\l.ll.

nrxrl.(l 1,,,))

tl)1.

r.ri r(j

t{ll

('(1,.r

i,r

ro

l.(.,,,,tr | tlx. I)llUK

12

io,!c,,i,ig d,cif ritx;fing

I

C( )\ l R( )I- ti\( )lls

s.raL. u';i)g

r

I)liillips

o

99

r.t

ialrnd iblby

h.adcd

('11

l.oosci

(h(i

S(iltl:,\\'S,,)rrk.d

f,or)

i.t

r,)

ktr.

I

(5)

Loosen

the

SCREWS

narked

from

{a)

to

(d).

(8)

Loosen the
mark€d

RETAINING

(al

from

to

SCRDWS of dcck frame

id)

Lifl TAPE DECK and
cabinet

(B).

AMI'LIFI liR

(Dr

tr"m

,he

(9)

SEPA'AIC

TAPE DtrCK

(M)

frOM AMPLIFIER

(A).

(7)

Disconnect the PINS
PLUGS or motor marked
head

marked

{B)and {j).

of speako marked

(€)

and

(f)

and the

{a)

and

PINS of

(d),

the

Fig.

TRANSPORT MECHANISM

Y

Driving of Capstan

Fjgure l.

Motor

{Aj
(B)

Driving Belt

(C)

Capstan

(D)

FlYwheel

High-speed rotation of Mot /

(B)

Br,
to Flywheel with ample inertia and €nables rated
by absorbing

and transmitted to Capstan

mino.

rotation

Capstan Rotation 606 r.p.m.

303r.p.m. at 3-%'(9.5 cm)

l5l.5r.p.m, at l

Motor Rotation 2,900 to 1,450 r.p.m. at 50 cps.

3,480 to 1,74{r.p.m. at 60cps.

(flat

belt)

(A)

is reduced by D/trire'

(C),

which is connected

rotaiion

distortion ofDotor itself.

at 7-%'(l9cn)pe. sec.

-16'

(4.7s

per sec.

cmlper sec.

I

Driving of Pinch Roller

Put tape between rotating capstan and pinch roller
push pinch
tape

at rat€d spe€d.
roller is between I,000 to I,150
of 7-%'

(19cm)

against

rouer

per s€cond.

capstan,

this will transport

Th€ appropriate pressure of

grams at the tape sp€ed

and

thc

pinch

Fig. 2

R€coding and Play Back

(A)

TuJ[ rhe RECORD, PLA rB,4Cf

position, and pinch roller presses against capstan
tape at the rated
between

lD)
moved and wound on the take-up re€I.

The Tak€-Up Reel Spindle Base is made up of
tic
is rot^titg the
winding friction is adjust€d by
enabl€ rated

Blake
provides

ing

to,
BACK
Safet! dnice

Motor &tshitag

b rr^ns'lr.it the motol /rldtro,

(l

rollers

on the other ha d, the S*pfb

lo e/

app.opriate back tension by

to the rotation ofthe Pull€y

To prevent

(F)

mut be depressed
knob can be moved

(See

Fisures 2 and

sp€ed.

with a clutch felt in betw€€n.

and 2l

plastic

winding of the tap€.

hwg on the Plastic

lEl

accidental er^sure, the Record lnterloch

lclls

At the same time,

znd t}:'e Tahe-Ut Reel Spindle

ICI

(2)

mUel

depressed to ente.

under. Therefore, the tape-

before the RECORD,

to the

3)

ffi

knob

to

{D)

the

slipping

Reel Sbtndle

Roll€r

the .lutch fet slipp-

(3)above.

"REC"

the record mode

Slipping Rotation

to

Idlel

so that th€

of the felt

under

{4)

position.

"PLAY"

to move

(B)

moves

tape is

two plas-

The ldler

h^s a

IHI

which

But-

PLAY-

The

to

-6-

\

FAST-FORWARD MECIIANISM

TurD

lie aASZ FWD-REWIND *no,

5)

(D)

(B)

undcr lhc knob pushes

moves

into

and

lH)

FWD" position, and
the Lerer
the Plast c Rouer
the uppe. part of th. rotating motor drive bushing to
transm;t the motor rotat;on to the takc-up reel spindle. At
the same tihe,
sp;ndle to free
fast

(C).

windnrg
(Sec

ofthe tapc onto thc iakc-up rcel.

ligures 4 and

FreeRolarion Fl;gh-SpeedRotation

ll's ca-

The l.tler

above the Take-Up Reel

lF)

Brale RoUerc

lr, Srrrl! Reel Sti dlelcl,rheteby allowiDT

(A)

to

the

(I)

cone otr the reel

bctween

spacc

Spindle and

"FAST

up

f

Fig.4

Fig. 5

REWIND

"f

utn the FAST FWD-REtl/N,

position, and

up. The

lC)
per part of

MECHANISM

the cam

ldlerlDl

the

lB)

noves

rcIating Motar

Interned ate Pulle,lF) to hansmit

o

izo,

u^det $e k\ob ptshes

into thc space

dtue bushing

the high-speed
of themotor through the interm€diate
Reet

Spindte

come ofl

the

ther€by rewinding the tape

(See

F;surcs

At the

lC).

sahe time, Brale

re€l spindle b tree the

into rhe supply reel

6 and 7)

take-at leel spindte

High'Speed Rotation

'J

Fig. 7

(A)ro

"REWIND"

betwecn the

pulley to

Roll€ls

YO

o

the Leuer

and

lE)

rotation

tr? Srrrll

(H)

and

ar a fast

up-

the

(I)

lJl,

(a)

sToP

(b) FAST-FORWARD

(.)

REWIND

Id) RECORDING

NOTES :

-marks

x

O-ma.ks

o

o o

indicates
"engaged"

o o

"open"

and

o o

STOP

{A)
sp;ndles.

the .eel spindles, no triction works

7

CONTROL

Push ihc

and

As thc brake rubb€r depfesses the

Supply R*l

stop lever to

depres reel spindles to stop .otation

1B)

Spindle

R*ind

"STOP"

ldle$heel

fig. 8

positlon,

on the tape its€lf.

Take-up Reel Spindle

Bruke Ro els

of the reel

plastic rolleG under

('

RDCORD/PLAYBACK CIIANGING

turning the RLCORD/PLAYBACK

By
LEVER
to .ecording position.
If the LIVER

(bi

and

(c),

as

(c)do.s

;llushated in dotted l;nc,

not turn

propc.ly.

MECHANISM

KNOB

(N)to

then the RECORD/PLAYBACK

SWI docs not operatc

recording position, thr

the

LEVIiR

CHANGD SWITCH

prope.ly so may occu.

1a)pulls

the abnormal oscillation

the RECORDING

(SWl)turns

and

Then

must

adjust

the LI.VIR

(cl

to proper position

by loos;ng thc SCREW

.

r il.',

Itz__\,/..r',

'l-a1'1';':

.'/...

(//

,,-^:,..

,/

\l/

..)._u.

.

,4)"

JWt

lcll.

-

,z--\

,

/

_

r

ADJUSTMENT

U

1. ADJUSTMENT OF

It is imporlant that the piich

complcte alignmentwith

pressur€

wheel
unit is ope.ated

from this specificalion

tion
Check
r,ecesar

I'in.h

y.

is bctween

at the tapc spccd of7-t6

wheel pre"su,. bv r

ju"r

rhe pin, h

ad

2, ADJUSTMENT OF

take-up ;dlm wheel

The
ment ltith thc takc-up reel shaft.
fast forward condition,
upper knu.led

will

and it

play modc. Adjust idlerwhccl

or

wheel pressurc is kept between 50

idler

qh..l

;dler

The slippage occurs

wheel

contact

rapidlv

to thc lower kn urled

:ir".

..t,

PINCII

the capstan shaft.

1.000 and I,150 grahs
will result in wow and

whpFl

TAKE.UP IDLER WHEEL

must

be

thc idler

the takc-up reel shaft

of

wear.

:f Ihf pre*u,.

if thc prcssu.e

=..".".,..

;

ll

Fig.

12

Fig.

WIIEEL

wheel shaft i5

A properpinch

ips. Any devia'

.1-.ring

load 5t.inB.

kcpt in complete align-

Whcn the unit

whe€l will contact to the

whccl du.ing record

load spr;ngsoihatlhc

and 80 grams.

is smallef thaD the

R(/.Ly Hli

kept nr

whcn the

'cale

assembly.

Px,.ssi\c.

b

flutter.

at.d.

is set in

The

OF TAPE

3. ADJUSTMENT

The .c\rind
mcnt with thc rewi.d
to the k,,urlcd
50 gfams during rewidd ope.ation. Adjust both thc idler
load spriog aDd

if

4. ADJUSTMENT

Thc

whccl

idler
part

of
sct in rewind mode, it will
taneously deliverins torque of
su.cis50grams. Adjust thc load sp.;ngofthc inrermed;ate
wheel if the

5. ADJUSTMENT OF TAKE-UP REEL SIIAI'T
ASSEMBLY

A felt clutch mat.rial is attachcd to the bottom sid€

the

reel

stretched during lhst forwafding operation due
tension. To check the
a S'inch reel

diameter, and gently pull the cnd of tapc upwarcl
spring scale.
of tension at this part will bc kept between
grams. Anoth€r felt
takc-up drive wheel. It is to pfovide proper slipping
ration
checkins friction of
between 120 and 200 grams of frictioD
best result.
takc-up dr;ve
mode,
reduced and \viil become I0
rvhether this is satisfactory ;f iot,
spring

fisure

lscc

6. ADJUSTMENT

ASSDMBLY

A felt clutch
thc reel table base plate and
protect reco.ding
winding operation.
pa.t, place onto thc supply reel
rcco.ding

pulL thc cnd of tape upward by a spring
thc

conical sp.ing so
bctwecn 400and500grams.
to thc re\v;nd
ope.atioD cluring
for checkn)g
and betwe€n 80 and

result. Whcn

best
the

amount
become l0 to 20

Check

spring and spring r€tainer

7. ADJUSTMENT

A

vertical azimuth
adjustment
align tape head, play 8,000 cycles
standard alignment
sc.ew

hole which
head assembly.

TRANSPORT

OF

whccl

idler
motor bushing should be maintained

rewind roller.

OF

intcrnediatc

and thc rubbe. ring vhich is uscd on the uppe.

the supply

pressure is not sufrc;ent.

table

du.ing

Adjust the

the

amou.t

fo. Bfakc, and spring rctainef

ll

wheel

reel shaft assembly. When

basc plat€ so

with

fecordins

Adjust the

record or play modc. The procedu.e

this part

whcel.

of f.iction of this part

(al

lefo

at

UNIT

REWIND IDLER

must be kcpt in complete

shaft. The amount

reel

INTERMEDIATE WHEDL

is located between the

contact

that reco.ding tapc w;ll not bc

amoudt

conical

clutch

star-shapcd

lvhen

to thcsc parts sihul-

motor. An

of friction of this part, plac€
tape wound by 60m/m in

sp.ing so that thc amount

matoial ;s

; same as

spring

the unit is
to 20 grams.

readjust the star-shaped

washed

WSEEL

adequate

attached

the foregoing, and

will provide the

jnst
set

will greatly

Check

accordingly.

OF SUPPLY REEL SIIAFT

matoial is uscd between

the .ewind rubbcr ring

tape from an excesive

To

tape wound by 60m/m in diameter and

that thc amount of

drive

reco.d or play mod.. The procedure

friction of this part is same as

120

the

of f.;ction will greatly be reduced and

grans.

to

whether this is proper, if not,

sce

thc

check

wheel to provide

unit

amount

table

Anothc. fclt clutch is attached

of friction will give

s.ams

js

set

washc..

the love.

tension \th;le re-

offriction of

a 5-inch

scale. Adjust

tens;on ;s kept

proper

the

;n fasi forward modc,

rcadjust coil

figure I I

{See

OF TAPE HEAD

alignment of

that

until a maximum

is positioned on the shield cover

be made at

can

tape. Rotate

playback level through the small

tape head is the only

the field

recordcd on an AmP€x

th€

of service.

azimuth al;gnment

align-

pressurc

of

about

rewind

the unit is

pres-

to

excesivc

using a

400 to

in rewind

of the tape

500
the

to

opc-

for

the

under

be

to scc

side

this

rcel with

gently

sl;pping

foregoing,

(b)

the

will

at left)

To

ol

of
to

-9-

ADJUSTMENT

tll

AMPLIFIER

OF

r. ADJUSTMENT OF RECORDING BIAS FREQUENCY

Rccording/crasing bias frcquctrcy

otthc oscillato. coit

l0

or

the

100

ohm

13. ADothcr testirg

Fig.

a
in
cted to hor;zontal input terminals .,f the oscilloscope. Vary frequcncy gene.ated
90 KC, and set the oscillator at the point whe.r a desirous 6gurc appears on the
no$' corrcsponds to the reading of the oscillator. Check oscillator coil, C-17
mcasu.ed ; not w;thin 90 KC + 5 KC.

lpart *

resisto. ;n

l7-L,)

scrics

2, ADJUSTMENT OF RDCORDING BIAS VOLTAGE

A p.oper rccordnrg bias vottagc is 45 volts + 3 volts A.C.
and is adjusted
coDD€ct a V.T.V.M.

head

/play

Check Cl6
recording bias voltage
mentioned specificatioD.

by

as showD

(included

To measure .eco.ding bias voltage,

Cl6.

(Vacuum

;r the lig. 14.

AKl3)

mcasu.ed

was

set at 90 KC plus or m;nus 5 KC

its resonant

and

to the .cco.d/play head

instrument

Tube Volt Mete.) to the record

and

does

to

record/play head if the

not meet to th€

capac;tor

and coDnect vertical ;dput te.minals

be prepared is an audio frcquency

abovc-

before sh;pment. It is

(part

C-17). To mcasu.e recordiDg

f

oscilloscopc.

and bias head if the recording

oscillator and

tbe

by

audio frequency

'fhc

decided by inductance

bias frcquency, insert

of an oscillos.ope

jtsoutput

recordins bias

shouid
oscillator around

bias frcqucncy

i f^-

o;.---r:@*=;;'6d.".0,.-""

Fig. 13

as showq

be conDe-

frequcncy

L1{0,s.c)

3. ADJUSTMENT OF

A prope.

a V.'[.V.M.

Chcck Cl4 and crasc head il thc oasing bias voltage measured

€rasing bias

to the

ERASING BIAS

voltagc is 65 volts

head

erase

as rhown

VOLTACE

+ 5 volts

in the Fig. 15.

A.C.

and is adjusted by Cl4.

-I

li'

j(PllLEFT]

Hi|mn-!,(c,lEIcHr)

I#ltlri!i

To

not meet to the

does

#;;;-v'1c'

I;':I:::j-:-

lRrcHr)

v

l1

LE FT

1i,l

'

v,(P)(RrcHT)

F;g. 14

neasure erasing bias voltage, connect

above,mentioned spe€ification.

)

Fig. 15

ADJUSTMENT

4.

A
current of
The VU neter indicates oVU ! 2 VU wheD a signal of
at the microphone
thc volumc control set at its maximum.

Adjustment ot recording level can be accomplishcd by varying
tivity of VU metft, however, it is not necesa.y to make in a field

service as all VU
shipment.
NOTEi Make sure to stop oscillation by disconnecting the oscillator

rccording lcvcl, .cfefcd to

basic

30lA + l0 % flows to the recording head

mete6 have co..ectly been calibrated at

(See

lig. l6

coil | 17-L, at the points marked
ment

reco.ding lcvct.

of

RECORDING LEVEL

OF

jack

-40db

or

for details.)

+

as

"oVU",

5db at the line input

and

"P"

th€ point

s€t at

at

-55

factory befor€

prior to measure,

"G"

where

1,000 cycl€s.

db + 5 db

jack

when

sensi-

of

o-, ^

-,nrl

ll,,n

r

r"

Fig. t6

.UN

1. LUBRICATIONINSTRUCTION

For maximum senice life and optimum

ope.ation. Use only

Motor
Drive Capstan
Rewind Idler Wheel
Intermediate Idler Bearing
Pinch Wheel Bearing
Take-up and Supply Reel Shaft Bearing &
Also apply

light machine oil of

Shaft

Bearing and wind take-up Idler Bearing. I drop

a liberal frlm oflight machine

MAINTENANCE PROCEDURES

performance, lubricate

good quality

grease to

the

each roller surface of

parts

id€ntified

below after each 500

3

drops

2 drops

I clrop
2 drops
2 drops

all levers and cams.

hours of

CAUTION: DO

SOAKED IN ALCOHOL.
BE SCATTERI,D
WILL BE DETERIORATED.

NOT

OVER-LUBRICATE.

DURING

WIPE OFF EXCESS OIL BY A COTTON SWAB

O'THERWISE, THE OVER.FLOWED LUBRICANT MAY

OPERATION,

'

tt.6

THE RUBBER COMPONENT PARTS

r.-'-'''

r

17

Fig.

2. CLEANING

Wipe surface of

in alcohol or carbon-tet.

TAPE HEADS AND OTHER PARTS

tap€

FLYWHEEL

guide roller bearing, capstan

h€ads,

MOTOR

bushing and pinch wheel periodically with a soft

It

cloth

soaked

r7r-0ot

002
003

00.1a

005a

005c

TOP PAl{Et

Capstan Holder
'rablc

Table. Washel

A,

'Iapc

Guide

il

IIST

172-0O{t

001u Pulley,
001v

005
0o5,
00,b
m5c
005d

005f

005e

005h
oo-i

REPTACEMENT PARTS

OF

Washe. }in

Reel Shalr

Screw, without

]?Le-up R€el A$embly
Reel

Shaft
Felt Washcr
T,ke-up
Spfing G, Risht

Takr-up Rolle., B
Holder, Reel Shaf.

Typr spring)

(Sta.

Metal Fitlins

sPrirs,

He"d

A, Tat€-up Reel

Rouer, A

B. RceL

F3

_rnbL

ParB No. Nomenclalufe

172-012b

Plare. Automaric Shut of

0l2c Scr€w Sen,i-Cubi. 3x5

013, Mirtu Swirch M-8-3
0l3b Holdef, Switch
0l3c Screlv Semi-Cubic 3x5
0l3d Sc.ew IIat Mould 3xl5

0l4a

SNirh. Speed Change

pP slide swnch Nc)
0l4b Plate, Speed Change Switch
0l4c S.rew Flar Mould
0l4d Co.d

Supp.rt

.1x

10

005e Bcaring (635JZZ)

0059

Table, Washer

00si

Table D, Tape Guid€

005j lrop, Tape Guide

DECK FNA

172 001

Deck Fradc

002

H.ad A*embly, Conplctc

m2a

E.ase Head

m2b

Record/PlaybackHead

002c

Scfew Flat Mould 4r8

002d

Prop A, Head

002e

Prop C, Hcad

002f

S..c\Y l.-lat Mould 4xg

002g

S..ew Fhr

003

Index

Counier, Complete
0I)3a Pulley,
003b
003c

00+
00{2
001b Plate,
00rc Reel

004e
m4f

m{h Washer Pin, La.se

0O4j
004k

0040 Waiher

@4q
0O{r

Counte.
Belt, Counrcr
SGes, Wnhour H€ad 1x7.5

Supply Reel ^$embly
Sc.cv l_lnt

Reel Tabl.

Shaft A,

Rewind Pulley

Sp.ins

G, Left

r-ak€-up Rouer,

Holdef,
(Sta.

Metal Fiting,\, Reel

golde.,
lslar

Reel Snaf.

Typ. Sprins)

Pin.

Reel Shalt

Type Spring)

I

,1x

I

3xb

Supply Reel

C

large

Table

O05l

Washer

005n

Nylon Spring

006a

AS Levcr, Conplete

006b

Plate, AS Levcr, viih AS

Lever

006c

Screw Bind 3x5

006d

Wash€r Pin

dl6€

3 mn eround Lug

007a

Instanr Stop Lever,

007b

Spring. In$ant Stop Lever

{]07c

Stopper, ln*ant Stop Lever

007d

Screw Bind 3x5

007e

Hold€r B, Innant

007f Screw Flar
O08a

Recording Safety Bu(on

008b

Cah Sroppe.

008.

Fibe., C,n Sroppe.

000d

r.sulator Plate, Can Stopptr

008e

screw Fhr

009a

Pinch Wheel

009b

Metal Cap, tinch Wheel

009d

Lev€r, Pinch Whccl

009e

Shaft C, Pinch Wh.€l

009f

4mm

0099

Shaft A, Cam Roller

009h

C2m

mgi

shafr. Pinch wheel

0l0a
0l0b

Take-up B.ake Roler

0l0c

Screw, B.ake Roller

0l0d

3 nm Nur
0l0e
010f

olla

Levcr, Supply B.ake
olrb

Supply
ollc
olld

3mm Nur
0l1e

shafr, supply B.aLe L."..
ollf

Washer Pin
0l2a

(6P

Pin

ProP

Mould 4xB

Mould 4x8

Nut

Roller B

Lever, Take up Brake

sbafr, Takc-up Bralc Lcvcr
Washef

Screw,

Swnch, Autonatic Shur-of

Pin

Brake Roller

Brake

slide sritch)

Stop

Roller

]\

Lcvcr

Levc.

olsa Idler Whe.l

0l5c Walher Pin

0l6a

Internal Wheel

0l6c

Washer Pin

0l7b

Shaft, Lcv.r A

0l8b Cam Rolle., A

018.
0l8d

0l9b

021 Lcvc., D,2

022b Can Rollcr, A

023b Holdc., L.ve. G Meral
023c
023d

02lb

026a Lev€r F, lor

Roll€r, B

Cam
Washer

Washe.

Sropper,

Lever G

Idler Shaft,

Pin

Pin

Levcr G

Metal

B

Motor

027
028
029

Hun Buchins Coil, f6r

Left

12

172,030b Hunr

Holder, Hh Bucking Coil

030c

Screw

030d

B!.kins Coil. fo. Righr

Scmi-Cubic 3x22

Patu

No. Nonenclaturr

00le 8mm Ball Bearing
001| S$itch Table, A

17-C2

c3
o4

Mica Condense. 10U 500 Wv
Ceranic

CeEnic

Condenser 0-02 P

Condcnscr 0.02 P

Lever, Belt Change

032a

Metal Fitting.

032b

Sp.ing, Belr Ch.nge Lever

032c

Table. Lifter Pin

033a

Sporh, fo. Lilte.

033c

Can A, Hcad Lilter

033d
033e C,n

034b
034c
034d
034e
034f

0349

034h Sp.ins, B
031i
034j

173-001 Motor,Conrplere

00la
00lb Stepped Puuey
00lc Belt Holder
00ld
00le
oolf

00lh Moror Fan, D

00li MP Condcnser 2ul
mlj dolde., Moto. Condense.
mlk Prop, Motof
00ll

00lo S.rcw l.-lat Mould 4x50
00lp S..cv, virhout Head 4xs
00lq
00lr Hexasonal

17.1-001 Flywhe.l,Cobplcte

00lb Main Mctal C,se

00ld 4 n,m Ball Beains
00le Pl2te C, l.-lyrvheel

00lh Wing Nut
00li Sc.eN, llywhkl adju$
00lj Prop B, Flyvhc.l
001k lrop C, Flyrvheel
00ll Drivc Belt

175-0ol Svn{:h

00la Knob, Record/Playba.k &

B, Head Liftef

Sp.ing, UN-D
Spring. D
Spring. D
Spring, Idle.
Nerv Spring D
To.sion

Spring, Beh Change
Sp.nrg B, Belt Change

s..e\v

Motor
Oil R€tain€r
Motor Hold€r

Prop, Motor 0 x 21,5

Sc.cw Bind 3xs

Rewind lat Fo.wa.d

Belt

Spfins

Fla! Mauld 3x 15

Pulley

8x22.5

Nut

Block

change

(260vACl

Fai/Fonvard Rewind Shaft

00lb

Rcr'Playba.L Resind Shaf.

00li

Pin

00lj

Plate. Cam

00lk

Sp.ing, K

00ll

00ln SRitch
00lo Record/llayb2.k

00lp Spo.k Cam

mls Screw Bind 3x5

Ttble, B

Conv€.sion

cAst

176-001

A2

l7-AKl3 C.R. Compound Bodt

AKl4 C,R. Compoud Body

C26inrt,Complcte
002a Table,
002b Rubber Foot
002c Screw Semicubic 3x l8

003a Ventilator
003b

0Or2 ventilaror, A
00,1b

005a Ventilator,
005b Screw

Rubber loot

(Panel

S..cN T.us 6t 12

S-ew Tru$ 6v 12

B

Tru$

{ix

12

Escucheon)

006
007

00Aa Chasn A. Spealie.
008b Chash B, Speale.

009a Speaker

009b Sct\r

5x

7'i

Flat Mould 4x12

AitPUFttR

Ampli6er
Ampliner Knob, B
nsl€.

Sc.ew, rvithour Head 4x6.s
S..€iv, ivithout Head
Scrcw,

Knob, .\

changing Voltage

Semi-Cubi. 4xo

(Tone)
(Volume)

4x ll.5

c5
c6
c7
ca
c9
ct0
cll
ct2

cl4
cl6
cl8

C20a b

c2l
c22
c23
c24

l?-Rl liied Resisror

R2 lixed R€sistor
R3
R4
R5
R6 Fixed
R7

RB
R9
Rlo
Rll
Rl2 Fixed Resistor l,/,IP
Rl3
Rl4
Rl5
Rl6
Rl8 Wned
Rlg Wired
Rro lixed Resistor lL
R2l
R22 Flexible
R23 Fixed

R24 Fired

l7-vRl-2

VR3 Wi.cd

VR4 Wired

Oil Paper Condenser 0.05

Cerani. Condenser 0.02P

Ceramic

Ceramic Co.densef 0.02

Ce.anic Cond.nse. 0.02P

Ce.ani.

Ceramic Condenser 0.02

Tubular Type Elecr.olyric
Condense.
Mica Cond.nstr lou 5m WV
Mica
Mica Condensef 500J 500 WV
Lug Te.minal Type Eleclrolytic
condens.r 40+40
Tubular
Condenser
Tubula Type
Condenser 20/r 300 Wv
Tubular Type Eleclfolytic
Condenser I0rrf 15 WV
Tlbula.
Condensef

Fixed Relkrdr
liaed Resistof l/21'250KO
Fixed Resntor l/'2P l00KO

Fixed

[ixed

lixed Resntor l,'4P 20KO

Filed R€sinor l/4 P I MQ

Flexible Reshtor I W 8(}

liaed Reshtof l,/4P loKQ

lrixed Resntor l,/4P 500K0

Fixed Resnio. l/'.}P 500KO

Fixed Resisto. l/4 P I KO

wned R€sisror 3WL 180Q

Variable Reshtor I

soK(A) Double VR

100{I

1000

Condens€r 0.01 P

Condenser 0.002 P

s0

Af

Cond€nser lsu s00 WV

Type El.ctrolytic

,l0

rl

Ttpe Electrolytic

l0rf I0

Rosisror l,/4P 2KQ
ResGtor l,/2P 250KQ
Reshtor

Rcsisto. 10WL

Resisto. loWL 4700

wi.ed Resistor 3W 8f)
Resisto. l/4P loKQ
Reshto. I/.1P 5000

Vari"ble Resntor l/2W

variable Resisiof l/2w

M

P

P

25 WV

350 wv

llf

350 wV

Iilectrolyti.

WV

l/.lP 500KO
I/lP 3LQ
l//4P ,.2M{}

l/4P 500KO

2000

.t70Q

loKO

M(Al

l3

Paf6^"o­l7-SDl Sill.onc

sD2 silicone

\on,cn.lalu'c

rT tt

t2

l7Jr

J2
J3-5

(lonne.tiv.

2
2 Conne.rive
2 Connecrn(

J4
J6
l7

17-ll

\'2

r,r

l7

1,2

l7,Ml

I)nxlc sM-150D

I)io(le

SNl-150D

Pin

Jack

}n,

Jack

Pin

Ja.k

Pafts No. No.ren.latu.L

l7-S\!2

SW:l

Sw4

S$5

5\46

lT llll

TB2
TB3 4lL2
TB1
TB3

6P Sl'(lc S\nch. rvth \lhiic
Knob
6l' Sli.le S\rinh.

Krob ispealef
8P

l-osglc

oN,

6P Slnlc
Knob

52L2 Lug Pl.t.
,12L1

311-1
2Ll Lus

vr(uur,
va.uun, Tube l2^T7

rcr Conve^ion)

li\fu

e S\vir.h

Sl

S\ir(n

oFrrl

Svirln. \vnh Black

60,y(lr

1t0

Lug }lare
l,ug Platt
Lus Platc

l'hrr

'l\lbe

vith Wbitc

ON OFr'l

(l-'r{:k

iPo\fcr

12'\T7

Lhangt)

P,.6 No, Nonren.Lrtufe
l7-\rs3 V..uun

Drulrl typr

VS4 Vacuun

n,orkl

l7-Zl lran\formcr Angle,

,42 lransforner Angle. Rishi
z3 Namc Plate. Cycle

2.1
25 He\rsonal l.o!, Selector
26 Nade
27 3 nnn \ut,
Z8 Clord Support
Z9 Rubb.r Bush,

7rr lhrc '\,

Zl2

So.krt,

Phtc B,

Cla.ip
Clanrp

'Iube

Socket, 9P

Tubc So(kd. 9P

(yPc

change Voltage

Plrtc, Lhangc ,\Cl

spo.irl

AC Coftl

Ja.k
Jack

Pin, nr. 6BQ5
Pi., fo. I2AI7

Left

Changc

l7,tl-l lilot

lL2

l7 Swl

l-amp

Rota.y S\rirch
rlayba.k Co.verion)

Lanp

So.kri,

Front

S$ad Type

(Ro.orll

17 \'sl

VS2

T EXPLODED

Ponel

Vacuum Trbc So.k.t, 9P

moutr lype

vr.uun Tube

rYP.

nnrnld

VIEW OF

I7t

00t

So.kcr. 9P

COMPONENT

Zllr SL.dv ScdriCubi.
Zl lb Screrv SenriCubr
zl4c S.r$v Flat
Zl4d

S.rc\L S.nri Cubi. 3r

Mould

PARTS

lra

:l:6

,1:

lt)

6

-0

I7t

171-0

-006

r

Amp

I76

176

17 213

lif ier

008a

0l

I

I76

009a

17

A5

I76 0c8ll

nl0

I76

17 Z.

17\t2

17

213

I7-SW,

17- J.
17-J,

Amplif

176 010

I76-008a

ier

II

]7.SW,

r7

Jl

176_009a

]7.VS,

17

Z.

1-7-214.
17 Z1+a
i76-0t0

17-J

t7-2,,

I7-Sy/

17

17 Z,

t7
17 T

176

Z7

z

010

7SW

17-

17.)
r 7 S!!,

17 J

008b

176

11'Z I a

I7VS,

t76 010

r

t7

-y26

i=

1l

d

cr

:€

e

fF+

(I

=

o,

;

t

=

r=

,\-a

1b,

176-O0l

r

76'006

Cqse

I

176

Cose

007

II

Case

llt

176-002a

i\,rr-ooo^,.--4

112 0A4b

172'OO5a

172-AO4c

172-OO4d
172-005b!-

-172

OO4e

112
172-004f

1 /2-AA5d

172-OA4h

172-OO5e
172-O05f
172-AA4i

72-0a4J

172-OA5

172-OO4k
172-OO4l

172'OO4n

172-O05i
172-OO5k

172-OA5l

172-OObn

,{.fu

N

Eo

5F

N$

N

N

N

T

\

I

l'-

N l'-

I

F.

l'-

8

l'-

.m

8

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l'-

l.-

-

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F.

R

t-

-19-

99

R

N

s

N

l_==

N

C

3e
tU

a-i-:--r€L

>iso

I

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0

o-

0s

_\_

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0

;a

o

g

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N

I

l'-

I

I

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N

N

-fttitt::itt_-

N

N

-c
I

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;7

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f-

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rqr-

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