Akai X-200D

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Fig.

26

12

. HEAD DEMAGNETIZING

Normally

tho

steel

po

le pieces which form a part

of

the

recording and pl

ay

-

back heads become

slightly

magnetized. The

effect

of

slight

head magnetiza,

l ion is

that

It

partially

erases

the

tape, especially

at

hi

gh

frequenci

es.

Gen

-

erally,

this

condi

tion

can

be

detected by

the

loss

of

hi

gh

frequency ·response

which

cannot

be corrected

throu

gh head

alignment

. Severe magnetization

(which may be caused by usi

ng

magnetized

tools

In

the

vi

cinity

of

the

heads)

will

resu

lt

In noi

se

or consi

de

rab

le

disto

rt

ion

in

addit

ion

to

the

loss

of

high

frequency response. Although Model X·

200D

already has a

built

-in Head

Oe

•

magnetizing Ci

rcuit,

it

is recommended

that

head

demagnet

ization be perform-

ed periodically. This can be accomplished by t

ouching

the

head

lightly

with

the demagnetizer and making several small circular

mo

tions over all head

surface areas as well as

the

head housing.

Noto: To avoid s

cratching

t

he

head surface, we

suggest

that

you cover

bot

h

prongs

of

the

head demagnetlzer

with

a sort of

masking

tape,