Fisher CR-W914 User Manual

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CASSETTE

DECK

ELECTRICAL

ADJUSTMENTS

BEFORE

ADJUSTMENT

If

the

tape

surface

whitch

contacts

the

head,

the

capstan,

and

the

pinch

roller,

etc.,

is

stained,

it

will

cause

unstable

running

of

the

tape,

wow

and

flutter,

inperfect

recording

and

erasing,

deterioration

of

tonal

quality,

and

the

tape

jam

around

the

capstan,

etc.

Occasionally

clean

each

part

as

follows;

}.

Cut

off

power.

2.

Open

the

cassette

lid.

3.

Wipe

the

head,

the

capstan,

and

the

pinch

roller

with

a

cotion

swab.

if

they

are

excessively

stained,

clean

them

with

the

swab

soaked

in

absolute

alcohol

or

cleaning

lig-

uid

on

the

market.

MEASURING

INSTRUMENTS

REQUIRED

Dualtrace

Oscilloscope

AC

VTVM

(AC

voltmeter

with

high

impedance)

Dummy

Load

(47kQ)

Frequency

Counter

Signal

Oscillator

Test

Tapes

#

10kHz

Test

Tape

(Example:

TEAC

MTT-114)

for

Azi-

muth

Adjustment

3kHz

Test

Tape

(Example:

TEAC

MTT-111)

for

Tape

Speed

Adjustment

400Hz

Test

Tape

(Example:

TEAC

MTT-150)

for

Play-

back

sensitivity

Adjustment

Test

Tapes

for

Recording

and

Playback

Operations

+

Normal

Tape

(Example:

TDK

AC223)

oOo

Oo

Oo

8

t

SWITCH

POSITIONS

Unless

especially

indicated,

set

each

switch

as

follows;

DUBBING

SWitch

oo.ce

ccc

ceeeeeeeeseesesaeeeseesreeseenees

LINE

REC

SPEED

SWIC

o).cisclsccssessossevds

naz.

duvnelasbendecavestecs

dubeieets

NORMAL

DOLBY

NR

SWitCH

oo

ccceceecteeseeecsstcecerssnesecseavaaeass

OFF

TAPE

SELECT

SWitch

oo.

cecceecesccsecscesetesecsseeneenee

NORMAL

TAPE

SPEED

ADJUSTMENT

1.

Connect

the

dummy

load

(47kQ)

and

the

frequency

counter

to

the

LINE

OUT

terminal

L.

2.

Load

Deck

2

with

a

test

tape

(Example:

TEAC

MTT-111)

and

set

it

in

the

playback

mode.

(Deck

1

is

stop

mode.)

3.

Adjust

the

potentiometer

(P301)

in

the

Amplifier

P.C.B.

until

the

frequency

counter

reads

3,000Hz

+10Hz.

HEAD

AZIMUTH

ADJUSTMENT

1.

Connect

the

dummy

joad

(47kQ)

and

the

dualtrace

oscil-

loscope

to

the

LINE

OUT

terminals

L

and

R.

2.

Load Deck

1

with

a

test

tape

(Example:

TEAC

MTT-114)

and

set

it

in

the

playback

mode.

3.

Adjust

the

azimuth

adjustment

screw,

so

that

the

wave

forms

become

maximum

on

the

oscilloscope

and

the

right

wave

form

overlaps

with

the

left

one.

4.

Perform

the

same

adjustment

for

Deck

2.

an

After

the

adjustment,

secure

the

adjusting

screw

with

paint

or

glue.

PLAYBACK

SENSITIVITY

ADJUSTMENT

1.

Connect

the

dummy

load

(47kQ)

and

AC

VTVM

to

the

LINE

OUT

terminal

L.

2.

Load

Deck

2

with

a

test

tape

(Example:

TEAC

MTT-150}

and

set

it

in

the

playback

mode.

3.

adjust

P101,

so

that

the

output

of

LINE

OUT

becomes

500mV.

4.

Connect

AC

VTVM

to

the

LINE

OUT

terminal

R

and

adjust

P102,

so

that

the

output

becomes

500mV.

BIAS

ADJUSTMENT

1.

Connect

the

low

frequency

oscillator

to

the

L

side

of

the

LINE

IN

terminal,

and

the

dummy

load

(47kQ)

and

AC

VTVM

to

the

L

side

of

the

LINE

OUT

terminal.

Load Deck

2

with

a

normal

tape

(Example:

TDK

AC223)

and

set

it

in

the

recording

mode.

Set

the

input

level

volume

control

to

the

maximum

posi-

tion

and

feed

the

signals

of

1kHz

and

12kHz

at

7mV

(—43dBs)

from

the

frequency

generator

into

the

unit.

Then,

record

the

signals

on

the

tape.

Play

back

the

recorded

signals

adjust

P103,

so

that

the

difference

in

output

of

the

1kHz

and

12kHz

signals

be-

come

+0.5dB.

Adjust

P104

for

the

R

side

by

following

the

same

proce-

dures

as

described

for

the

L

side.

Table of Contents

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Fisher CR-W914 Specifications

General

Brand	Fisher
Model	CR-W914
Category	Cassette Player
Language	English

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