Service manual

ManualsBrandsZenith ManualsComputer equipmentSM-Z-90

4-10

,'--

DOUBLE-DENSITY

DISK

CONTROLLER

DISK CONTROLLER CHECKOUT ERROR MESSAGES

Prompt:

Are

All

Drive

Motors

Turning?

If

they

are not turning, be sure

that

power

is

applied

to

the

unit,

and

the

cables are

plugged

in

correctly.

Then

repeat

this

test.

First, check to make sure that the

power

to

the

drive is on.

If

the

power

is on, check

the

connection of

the

ribbon cable on

the

controller circuit board (this is

the

third

circuit

board to the

immediate

left of

the

disk drive).

If

the

ribbon cable is connected correctly,

compare the

jumper

selection on

the

controller

with

the

section selections given

in

"Reconfiguration"

on

Page 2-1.

Then

repeat

the

test.

Prompt:

Is

Drive

Select

Light

On

and

Head

Loaded?

If

not, be sure

that

the

drives are

jumpered

for

the

proper

drive select,

and

that

inboard

drive jumper is

in

the

proper

position.

Then

repeat this test.

Check

the

drive jumpers

on

the

disk

controller board against the settings given

in

"Reconfiguration"

on

Page 2-1.

Then

repeat

the test.

Prompt:

Attempting

to

verify

the

operation

of

the

Head

positioning

system.

Please

stand

by

...

If

there is

no

track indication, check

the

head

movement

and

indicator operation.