Zenith Data Systems SM-H-17-1 Manuel d'utilisateur télécharger pdf (Page 10)

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ROTATIONAL SPEED TEST

If

this

drive is

used

with

the

hard-sectored, single-

density controller (H-88-1 or H-17), perform

the

fol-

lowing

"Speed

Test."

If

this drive is

used

with

a soft-sectored, double-

density controller, perform

the

rotational

speed

tests

as described

in

the

system software documentation.

Speed Test

This test will check

the

rotational speed of

the

floppy

disk drive. After

the

test starts, it will display

the

disk

drive speed test message

and

a

"speed

equals" mes-

sage as follows:

Disk drive rotational speed test

Drive

speed

=

The

word "Working" will

be

flashed

on

and

off

at

the

home

position

and

a drive speed

number

(in octal),

which

should

be as close to 200 as possible, will

update

with

each flash on

the

screen.

The

rotational

speed tolerance is

one

percent.

The

displayed value

should

be

between

166

and

212 (remember, octal

numbers jump from 177

to

200). Do not adjust

the

speed unless it is out of tolerance.

The

drive

unit

has a control labeled R30 or R7,

which

is used to vary

the

drive speed. This control is located

near

the

lower edge of

the

circuitboard or

on

the

other

side of

the

drive as

shown

in

Figure 4-1. This adjust-

ment

may

be

extremely sensitive, so

if

an

adjustment

is necessary,

do

not

turn

it

far

in

either direction. Less

than

one degree of rotation

in

either direction

should

bring

the

drive

speed

into

tolerance.

Turn

the

control

clockwise to decrease

the

speed

or counterclockwise

to increase it.

You mayhave to performthis testagain

at

somefuture

time,

depending

upon

how

heavily

the

floppy is used.

As

the

drive bearings wear,

the

speed

may

change

slightly. Fluctuations

within

the

tolerance are normal

and

may be attributed

to

variations

in

temperature

and

humidity.

• Plug

in

the

line

cord

and

turn

on

the

Compu-

ter.

• Refer to Figure 4-1, install a diskette

into

the

drive as

shown,

and

close

the

door.

The

test

will

not

start

until

this

is done. Also,

the

test

will not damage the

data

on

the

diskette.

OR

Figure

4·1

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