(D

r:torueen'

STEREO CASSETTE TAPE DECK

GT-llo

ORDER NO. ARP-215-O

This

service manual is applicable Ce manuel Este

d'instruction

manual de

se refdre

servicio tlata del

CONTENTS

r. sPEcrFrcATtoNs

2- FRONT PANEL FACILITIES

3. CIRCU|T DESCF|PTTONS.

4. BLOCK DIACBAI!1

5. DISASSEI\4BLY PARTS

6.

7. EXPLODED VIEWS

LOCATION

AND

. , , ,

. ...

PARTS

to the ZE

mode

au

metodo de aiuste

. .. ..

LIST

type.

de r6glage.

10 12 l3

,

en frangais.

esclito en espafrol.

2 3

8. ELECTBICALPARTSLIST.........

9. PACKING ]0. P,C BOABDS lt.

SCHEfu'IATIC DIAGRAN]

12-

ADJUSTMENTS

CONNECTION DIAGFAIV

. . . .

2l 23 24 27 30

PIClNEEFI ELEciTFIc!NIC

FIoNEEFT PToNEEF FIONEEE

ELECTFONTC€ (UAAI ELEcTFoNtc ELECTEIONIC

[EUFolPEI

CClFIFc'FATIclN

tNC. r9e5E

N.v.

OomnsuezSr,L

YZ

SEP.lq32 Prlnred in

G)

J:pdn

1.

SPEC|FtCATIONS

Systems Compact

Heads

l\4otor.

WowandFlutter.......

FastWindingTime

Frequency

-

20dB recording:

Normal

Chrome tape

lvletal

Signal-to-Noise Ratio

DolbyNROFF.........

Noise Reduction Effect

DolbyNRON.........

Harmonic Distortion

Input (Sensitivity/l\4aximum

MIC

LfNEflNPUT)

Output

LINE

"Hard

. . . .

. .

Response

tape

(L,

R)

. .0.35mV/57mV/10.5kO,6mm

(Reference

(OUTPUT)

Permalloy"

......

aliowable input/lmpedance)

level/Load

recording/playback headx

.......

No more than 0.05%

No

. Approximately

MIC impedance;250fl

. . . . .

impedance)

SUBFUNCTIONS

.

Dolby

NR system

.

position

3

.

full

lC

.

Air damp eject function

a

Full

o

One-touch recording

.

LED level

tape selector

logic

automatic

meter

(ON/OFF)

(NoFM/croz

control

stop mechanism

system

B type

cassette,2-channel stereo

"Ferrite"

more

. . . . . . .30to 16,000H2

.......30to16,000H2

.......301o16,500H2

......

More than

No more than

erasing h€ad x

DCservomotorx

10.17%

than

'l

10

{C-60

(40

to 15.000H2

(40

to

15,000H2

(40

15,000H2

to

Morethan5TdB

10dB

{at

1.0%

diam.

to 1OkO)

50mV

. .

/25Vl75kO

45OmV/50kf,2

ETAL)

/M

1 1 1

(WRMS)

(OlN

seconds

tape)

t3dB)

i3dB)

l3dB)

skHz)

(0dB)

jack

)

MISCELLANEOUS

Power Requirements Dimensions

Weight

(without

FURNISHED

Connection cord

Power

DC

cord

. . .

.420

16-9/16

package)

PARTS

. , . ......DC20V

(W)

x 101

(W)

x 4

.

{H)x

(H)

x 9-3/8

3.3k9

237

NOTES:

Reference Tapes: Normal & LH: DIN 45513/BLATT

1. or equiv.

6 CrO, DIN 45513/BLATTT or equrv.

2. Reference Recording Level: ('l60nwb/m

level

reference

Reference

3.

4. Wow & Flutter: . JIS

pensation acoustic

45507 Frequency

5.

DOLBY NR OF, level deviation is indication.

6. Signal

nic B LATTT).

7. Sensitivity: Input

recording level maximum.

8. Maximum Allowable Input: While

of input input the becomes

9. Beference Output Level: Playback

meter

level)

Signal: 333H2

(weighted)

compensation

to Noise Ratio: o Measured

distortion 3% level, weighted

(REC)

jacks.

point

where recording amplifier

clipped.

indicates 0dB.

magnetic level = Phillips cassette

rms value]

(weighted)

Response: a Measured at

level

with input

level

controls and increasing level at

this is the maximum input level

fvleter

[3kHz,

(mV)

(REC)

0dB indicating

with acoustic com-

DIN

[3.150H2,

PEAK valuel; DIN

-20d8

16dB

at the third harmo-

(DlN

required for reference

controls

decreasing settings

output waveform

output

level when

(D)

lb 4 oz)

{7

(CrOz

without

45513/

set to

(mV)

mm

in.

)

with

level.

at

2.

FRONT

PANEL

FACILITIES

eowen

@

Pushing cator off the .

.

@

Push holder, .

@ @

This

@

Push

@ @

This lights

@

This lights

@

These during

@

<

>>

this

light.

to

power The muting set

to ON

This is

not

When

the

the unit's

e.lecr

this button

push Do not

cnsserrE reee

shows the

coururEn

this

button

eowen nec

during the recording

enuse

during

LEVEL

indicate

playback.

rurucrroN

(REC)

O

(REWI

(FF)

swrrcH

switch turns

Push

to

the unit.

circuit is

and the unit

failure

a

POWER

operation

BUTToN

to open the cassette holder.

the top

press

this button

on the

the switch

activated after the POWER

will

or malfunction.

is

switch

is released

back until it locks.

while the tape is moving.

DooR

couNTER

position

to reset

tNDtcAToR

rNDtcAToR

tNDtcAToRs

the input

of the tape by means

REsET BUTToN

the tape counter

pause

the

mode.

level

during

swtrcHEs

:

Push

this switch to the The

switch does not loaded loaded

:

Push

(from

:

Push

speed

position,

ON

or when the

cassette have

this switch

right

to

this

switch to send

(from

left

power

and causes the

again to release

not

operate

set to

mode.

to

teft).

to right).

OFF

and the

recording

start

work when

erasure

been

rewind

to

while

stop

display

recording.

the REC

broken off.

the tape

power

it when

for

the unit mode

To

of a 3-digit

to 000.

and the output level

prevention

the tape at high

switching

has

switch

about 4

close the cassette

seconds.

is

operating,

is established.

When

depressed indicator tights. a cassette is not

tabs of

forward

indi-

been

meter.

speed

at hiqh

(STOPI

I

(Pausef

tl

reee sELEcroR

@

These

selectors

to

be selected during recording

playback,

during

Normal tape

Chrome tape :

Motal tapo :

oolav*

@

Push

this noise reduction been recorded

switch.

rurc

@

These

are the input channel phone

into

rrueur

@

Use this to

from

or clockwise THE

RECORDING

a

The

word Lice nsi ng Noise Reduction Laboratories

:

Push release

:

Push during recording the tape The tape wind operations

pushed.

as

allow the tape's

in line

:

Release tton. Push and oosition. Push

position (

NR

switch to

system and

using

JAcKs

microphone

the R

.iack.

LEvEL

adlust the level

panel

the rear

increases

"Dolby"

Corporation.

System

Licensi

this

switch to stop the tape travelling

function

the

this

switch to

resume

to

does not stop

switches.

stop the tape temporarily

playback.

or

traveling.

during

even

when tne

swtrcHEs

bias and equalization and the equalization

with the

the left

release

both

the

-

type of tape

teft

switch to the

switch to

the right

left

and right

).

being used.

the

switch

switches

swtrcH

ON when recording

when

the system. For

jacks

for

microphone

the

L

jack

into

coNTRoL

input

of the

LINE INPUT

the level.

LEVEL.

and

ng

For further

are trademarks

D0

mqnufactured under

Corporation.

with the

playing

back tapes

other tapes,

recording.

and the right

signals

terminals. Rotating

details,

of Dolby

Release it

fast

forward

(nause)

ll

characteristics characteristics

"out"

(

"in"

-

(

"out"

to tlre

to the

built-in Dolby

which have

not

do

plug

channel micro-

from

the

this

refer to

Laboratories

license from

and to

to allow

or re-

switch

posi-

I

)

position

)

(

I ,'in"

push

this

the left

MIC

iacks

control

SETTING

Dolby

)

5

3.

CIRCUIT

PLAYBACK

3.1 The

by the

signal

from the

Q102/Q103

fier. In the NORM

zation NF emitter. In the is turned switched

(120ps)

compensation

circuit between the

METAL

on,

and

from

120ps

DESCRIPTIONS

CIRCUIT

playback

2-stage

position,

Q103

and CrOz

the equalization characteristics

to

70ps

head

direct-coupled

playback

the

is achieved collector and

positions,

to compensate the frequency response. The level of the output

is

amplified parised

2 of the

through

Dolby IC.

This Dolby circuit consists

the

and MPX filter ON/OFF switch is OFF, the 19kHz

Dolby

The

IC401, and is switching IC

by a variable resistor, and

set

by the

the

flat amplifier

Q401

MPX filter

of IC401

Dolby

ON/OFF switch

switch.

circuit

output appears at

passed

LINE OUTPUT via a

to

(IC402).

before being

and applied

(HA11226),

is linked to the

When

filter is bypassed.

is amplified

ampli-

equali-

the

by

Q102

Q104

EQ AMP

further

to

Dolby

the

8 of

Operations

during Each Mode

The mechanical following chapter

1. When When the

applied to period

0V to 5V IC's IC

into stop status which

four seconds

circuit changes

(see page

the

7).

POWER

(Vcc)

1

when

1 voltage is being

(approximately

intemal reset circuit is

after the During this time, no pressing

any of the other operation

PM9OO2

rcroz

operations effected by the

are described in the next

Switch

switch

is

Switched ON

is

switched on,

of IC102. During

*5V

the initial

increased from

from

activated,

maintained

is

power

switch is switched ON.

change can

B

0.6V to 2.4V) putting

for about

be effected

control

the the

by

buttons.

is

3.2 RECORDING CIRCUIT The input signal from the

amplified

passed

INPUT adjusted.

flat amplifierQ40l. D313 and

to before

protect

to signal amplified the appearing adjusted tion the to the

by the microphone amplifier

the

MIC/LINE

selector switch

via

volume control where the input

This

adjusted

IC103 form

IC103

signal is

protector

a

from large input signals.

by the flat amplifier

MPX filter

at

to

2 of the

8. The level of

by variable resistor. Then after

in the REC AMP

type of tape being

(Q106) used, the signal

recording head.

3.3 CONTROL CIRCUIT The control circuit

chip IC

operations.

this IC

to employed control,

(PM90028)

In addition to

also includes

the digital

in timing settings

all operational

counter

been eliminated. shown in Fig. 3-2, different relations

page

on

Fig.

3-3,

and the output modes between circuits,

10, 11 and in

in

this

which

auto-stop

frequency

timing PM9002B

The

functional

the

in Figs. 3-4

see the

Fig.

3-1.

microphone

jack

IC101, and

to the

level is

passed

D314

via IC103

in

the stage

circuit designed

pa.ssed

is

Dolby IC,

the

output

this output

equaliza-

in accordance

passed

is

utilizes a one-

deck

enables

mechanism

feather-touch

control,

function. And

divider system

for the mechanism

discrepancies

layout

block diagram

time charts

and 3-5.

during

For

block diagram

is

The

via

is

to

due

have

in

inter-

is

+g

pquse

an

REC

p

STOP

REW

MS

PINCH

REw

Er

Fig.3-1

REC

y

r-a

REc

PAUSE

BIAS

osc

oFa

MUTE

S IGNAL

LINE

MUTE

"iI&,

ENO OETECT TIME

Control system

block diagram

REC/PB

LINE OUTPUI

head

4

Play

2.

pin and level. activated. In addition, MUTE) is to enable

3.

tabs intact is loaded in the deck, ICLO? the deck to be When (REC) also

Mode

When

(FLAY)

5

the

Q306

the

level

PLAY

button is

of IC102 is switched to

of

is

turned on and the

24

(PINCH

IC7O2

is opened 416ms

pressed,

thereby releasing the line mute

play

mode operations

after the

Recording Mode

When a cassette half with its

"L"

"H"

is

"L"

while

level,

recording

pressed,

level.

is

switched to

REC button

the

is changed to

changed

to

pressed,

SOL) to

PLAY

to

erasure

pin 3 (AR)

thereby enabling

mode.

(REC)

19 As a result, the REC indicator lights reed relay switching the And

the IC102

"H"

level,

(BIAS

pressed,

is Pin

27

opened 416ms

are thereby releasing status

to

(RY301)

signal

is switched off, thereby

path

to the

(PINCH

24

tape transport is commenced.

OSC) is opened 52ms

thereby

(LINE

activating the

MUTE)

and

after

after the REC button is

line mute

permit

the

recording

and recording mute

to

start.

recording

SOL) changed

the REC button

bias

(REC

28

the level of

"L"

level,

pinch

27

roller

(LINE

button

status

commence.

prevention

IC102

20

(RE'C)

is open.

up and the

circuit.

oscillator.

MUTE)

pressed,

"H"

of

to

22

is

Fast Forward Mode

4. When the

(-F-F)

is changed to

(FF

26

later.

Q304

solenoid

FF

SOL)

is

to start

button is

"L"

pressed,

level,

being changed to

thus turned

fast forward

on,

operation.

IC102

followed by

"H"

level 416ms

activating

the

8

FF

5. Rewind Mode When the REW button is

(REW)

?

(REW

25

later.

is changed to

SOL)

Q305

is

being changed to

thus turned on, activating the

"L"

pressed,

level,

IC102

followed

"H"

level 416ms

by

REW

pin pin

solenoid to start rewind operation.

Pause Mode

6.

4

pressing not released by

play/pause cording/pause the switches the the the deck to recording/pause

If the pin 2 (PAUSE) both changed to PAUSE

pause

The

mode in this deck is released

PAUSE button. The

the

pressing

mode,

or

mode. Note, however,

PLAY button during

play/pause

button

and

"L"

When both the

button during

REC

PAUSE

indicator.

deck to

pause

PLAY

the

button during

the REC button

that

recording/pause

mode, and

play/pause

mode switches

mode.

pressed

is

21

level, thereby

during stop

(PALJSE)

lighting

of

by

mode

is

during re-

pressing

mode

pressing

mode,

IC102

are

up the

PLAY and

+tzy PULSE

EX0

Fig.3-2

PM9002B

internal

block diagram

LINE MUlE REC MUTE

osc

Bras

REC

vcc

plu

AR

REC

pTiv

s-ioF n-EF

n

*

1,,,'

l

Fig.3-3

PM9002B

REC IUTE

LITE MUTE

F F

SOL

REW

Pr{ca

AUTO STOP TIME

ENO

NFg

layout

SOL

soL

PULS€

5

PAUSE changed to lights this IC is muted. If

pressed, are changed to REC

buttons

"L"

up. And

changed to

the REC and

IC102

PAUSE

and

are

level,

since

"L"

signal circuit being

Furthermore, of the signal has been mode is

o

Timing

27 is opened,

LINE OUTPUT,

to

changed

maintained.

Chart

pressed,

and the

"H"

27

Ievel, the

PAUSE

20

tnEel

and

level, resulting

IC702

PAUSE

(LINE

buttons

MUTE)

signal circuit is

Zf in both the

indicators lighting up,

switched to

recording

permitting

but

since

to

"H"

level, recording

2t is

indicator

of

are both

(FAUSB)

and the

circuit.

output

28

mute

Auto-stop

7. photo-interrupter

A

(END

16 resulting (C312) ly. The threshold voltage, and auto-stop When

tape travel stops and the take-up reel stops turning, applied pacitor

Mode

output is applied to

PAUSE)

of IC102 during tape transport,

in the capacitor connected to

being charged up

potential

at

17 is thus

prevents

mechanism.

photo-interrupter

the

to

connected

16, and the

to increase until it exceeds The IC is thus stopping tape

switched to stop mode, thereby

mechanisms.

discharged repeated-

and

kept

below the

activation of the

output

potential

(CgLz\

L7

is no longer

on the ca-

continues to

the threshold voltage.

17

Normal ooeration

Key input

\

.-

M.d"-

\

Terminal

IIUTE

LINE (

27

1

R€C MUTE (

28)

REC

(

20)

REC

(

19)

ErAS OSC

221

I

PINCH

SOL

(

24)

FF

SOL.

(

26)

REW

SOL.

(

25)

PAUSE

(

2t,

PLAY

STOP FF

lJr{

P PLAY

STO

\

H

I

L

STOP FF

STOP

STOP REW

REW

STOP

REC/PAUSE PAUSE

STOP

R€C

-L_

t_

STOP

STOP REC

REC

t_

STOP

PAUSE

PAUSE PLAY PAUSE

PAUSE

STOP

PLAY PAUSE

L

t_ t_

L

H

J

I I

J

_,r-

H

r

Fig.

3-4

PM9002B

time chart

Normal

op€rataon

Key

\

-M;A\

\

Terminal

LINE MUTE

I

REC MUTE

(

REC

(

Pin 20l

REC

(

AS

8r

(

PINCH SOL.

(

Pin 291

F F

SOL.

(

Pin 26)

REW SOL.

(

PAUSE

(

Pin 2l)

input

?rl

28)

19)

osc

221)

25

Oirsct

changs

FF

Blank

REC

PAUSE

STOP

\

H

L

REC

L

t_

H

fl

H

J

tl L

H

1

MECHANICAL

3.4 Playback Mode

The

CT-110

when

shifting the

(Both

mounted on o

the recording/playback

the

(see

Mode

Stop

The head base mode is presses lever spring gear gear. lever (D) keeping belt-driven

shown in

down towards cam

(B).

(D),

clockwise torque is Solenoid P is (F)

is

kept

by the cam

gear

cam

by

counterclockwise

OPERATIONS

makes use

head

of the capstan

base during

playback

and erase heads

head

base).

Fig. 3-6)

mechanism

shift

With

Fig.

cam

Operating lever

3-6.

(C)

due to operating

(C)

combined with

applied

inactive,

against

gear

(D)

stopper

retum

stationary. The flywheel

and

spring

the hook

(G)

the capstan motor,

together with

the capstan

Fig.

during

to

this cam

of cam

(E),

thereby

and

3-5

torque

mode.

are

stop

(A)

cam gear

of

gear

rotates

gear.

PM9002B

SotenojF

is

time chart

Gear lever return

(E)

spring

(Dl

gpar

Cam

Capstan

Nff."

Operating lever'Spring

Fig.3-6

STOP

operation

gear

(

Bl

Playback Mode

(see

Fis.

Solenoid

1. gear

to

3-7)

lever

Switch

2. Operating

(C)

by operating

gear (D)

(H)0.

P

is activated

(F)

released

is

(A)

lever

rotates

@

from Stop

() from stopper

pressed

is

spring

lever

engages

.nd

Mode

and

,

down

the

(B)

capstan

hook

(G) onto O ,

of

O

cam ctun gear

.

(B)

-+

Fig.

3-9

STOP

PLAY oPeration 3

Solenoid

Fig.3-7

(see

Cam

3.

to

Fig. 3€)

Switch

capstan

operating

4. After lift, cam

(H)o.

P

STOP

Playback

geax

(H)

gear

(H)

lever

(C) passes

cam

gear

\e/

t!,

-+

PLAY operation

Mode from Stop

continues

attd

,

@

(A)

(D)

(c)

up

1A)

.

O

point

the

disengages

Mode rotating

(C)

cam

of capstan

1

due

pushes

maximum

gear

to

o

Operation

can

As

Different

of

be seen

pin of operating

pin forces

mode.

the

This

action

of

pressuer spring

pinch roller

iorcing capstan.

releur" the drive gear

(see

the

Furthermore,

reel

the

arm,

idler

gear

rotation

being

Fig. 3-10).

gear

Drive

Fig.3-10

resulting

belt-driven

Parts

Fig. 3-9,

in

(A) rises

lever

the

HB drive

the

lifted

also

is

into

the

brake.

Pressure

in

to the

by the

Generation

the

base

head

spring.

at

close

brake

is also

idler

TU

the

reel

TU

of take-up

base

head

during

up

The

same

the

contact

is lifted

plate

applied

transmitting

base

capstan

reel

TU

torque

drive

playback

through

pinch

time,

the

with

to to

(the drive

motor)'

base

Switch (see

Fig.

Operating

5. lever thereby motion (G) cam lever mode).

(D)

Fig. 3-8 STOP

Playback

to

3'9)

(A)

catches

gezr (D)

(A)

Mode from Stop

lever spring

press

to

tending

cam

of

the arm

stops

becomes

-+

PLAY oPeration

(B)

against

continue

to gear

(D), but since

gear

of

rotating

stationary

Mode

forces

cam

the

lever

and

2

operating

(C)

€)

rotationary

stopper

(F) (E

operating

(playback

,

Switch to Stop (see

Fig. 3-11)

When

1. gear

of

(G)

bV the action of

(E)

Mode from Playback Mode

solenoid P is deactivated

(F)

lever

@

2. Operating lever

(A)

Iever rotation of the

3. Stopper

(F), shown in Fig.

against cam

of cam

head

base drive

(G)

stopping

catches the hook of

the mechanism in the condition 3-6

O ,

is disconnected from

gear

lever

retum spring

(B)

(C)

forces

(D

,

and lowering

@

(p

resulting

spring

gear

(D)

gear

(stop

mode).

the

arm

stopper

operating

in

lever

Rewind

When

Operation

solenoid R is activated the drive arm is moved gear

on

the arm

ing in rotation

the

plate

time, brake

engages

of the supply reel base. At

at the tip of

up,

thereby

Brake

Solenoid R

shoe

(see

Fig.

3-18),

to the left, and the drive

the supply reel

gear

result-

the same

the drive arm

releasing

plate

Brake

the reel brake.

pushes

I

the

Fig.

3-1 1

Fast Forward

When

moved

to the right, engages TU

reel base

Operation

solenoid F is

the idler

as shown being belt-driven same time, pushes

the

brake

reel brake.

-+

PLAY

STOP operation

activated, the drive

and the drive

gear,

resulting

Fig.

in

by

the capstan motor).

in rotation

3-12

on the branch

plate

up,

thereby releasing

gear

(the

of the

arm is

on the

of the

drive

At the

drive

arm

gear

arm

the

Supply

reel

base

Brake

Fig.

plate

3-13

Rewind

Drive arm

operation

Brake shoe

gear

Drive

Fig.

3-12

Brake

arm

Fast forward

plate

Solenoid F

TU reel

plate

Brake Drive arm bracket

operation

base

I

4. BLOCK

DIAGRAM

,.

MIC AMPLIFIER

+

t<_

25 dB

_____->l

REC,/PB

ERASE

HEAD

EQUALIZER

AMPLIFIER

CONTROL

CIRCUIT

MPX

FILTER

I

DOLBY

--*l

20

dB

NR CtRcutT

METER

REC

I

AMPLIFIER

CIRCU IT

HIGH

I I

h6

-ql | -l

ffinu-c'o'

s30r-3

METAL

s30t-7

LINE OU TPUT

swrTcH

stor

:

INPUT

SELECTOR

TAPE

s30r-7: s30r-9;

s60r s6O2

5604 i

I

roz

tc

POWER

SUPPLY

s605 s606

S9Ol

r20l

s

CIRCUIT

TAPE

DOLBY NR

:

FF

r

REW STOP PLA

.

PA

USE

r

REC

r

POW

ERASE

The

SELECTOR SELECTOR

Y

ER

PREVENT

underlined

DETECTOR

indicates

LINE

I.IOR CrOa

ON ON

ON oN ON

oN

ON

the

-

U

-

-_qir

-

HOLE-

switch

MIC

II IEN

METAL

OFF OFF

OFF oFF OFF

OFF

NO HOLE

position.

+Bt(il.7v) +

82(12.3v)

+83(r2.3V) +84(5V)

11

Pioneer CT-110 Service manual