Qume DataTrak 8 Bedienungsanleitung PDF herunterladen (Seite 7)

RELIABILITY AND MAINTENANCE

Recommendations

The DataTrak 8 can be mounted in any plane (horizontal

front

load, vertical

front

load, vertical

top

load).

When the DataTrak 8 is mounted in a horizontal

front

load position, the

button

on the

front

bezel

must

be under the

front

door

as shown below.

Error Rate

Recoverable Read

One error per

bits read

Error Rate

Non-Recoverable

One error per

bits read

Read

Error Rate

Seek Error Rate

One error per

seeks

MTBF

6000

power on hours

MTTR

minutes

Preventive Maintenance

6,000

power on hours

or 2 years

Design Life

15,000 power on hours

or 5 years

*Media Life

3.5

passesltrack

I •

Properly installed

PCB

down)

Improperly installed

(PCB

up)

*Media Life is over when "head

output"

is reduced

80% of

initial value, as measured by using IBM Diskette (IBM

1766872).

IBM COMPATIBILITY

The DataTrak 8 uses a standard 8 inch flexible

disk

(IBM

Diskette,

1766872 or equivalent) as the recording medium.

MOUNTING

The DataTrak 8 complies with the physical and electrical

characteristics

described below

for

full

compatibility

with an

IBM system.

Mechanical

Dimensions

The

mounting

and clearance dimensions

for

the DataTrak 8

are shown below.

TRACK POSITIONING

The DataTrak 8

positions

the

R/W

head

the center line

track

within

± 0.03 mm

(±

0.0012

an inch). Track

positioning

accuracy can be checked by using a Qume

Disk

(P/N

50152-01).

Data is written by the DataTrak 8 on the standard

media (IBM Diskette

1766872).

Read

output

level

READ/WRITE/ERASE HEAD

The read

output

level from the standard media

above is checked between

test

point

TP1

A and

TP1

B on the same drive.TP1A and

TP1

B are the

integrated

outputs

the head preamplifier.

The geometry

the DataTrak Read/Write/Erase head is

equivalent

the IBM Read/Write/Erase head.

The DataTrak 8 read

output

level, as measured by the

following

procedure,

satisfies

the requirements listed in the table below:

Dimensions in inches

14.57::: .08

TT-

C')

-,-1

J=~~======~===::::=-===-==;;.l;;='=';;;~~

1.00 :+:.04

-l

._~_-_3_.50_=

_.0_2

-_~_:

IBM

Compatibility

requires a 20% reduction in write current on

tracks

through

76.

Track

Output

(all '1') Resolution

Write current

all '1'

output

-----x

100

all '0'

output

40% MIN.

100

pop

MIN.

.80 = .04 --

4.00 =.02 -

---

4.00 .02

1 2 3 4 5 6 7 8 9 10 11 12 ... 18 19

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