Commodore 1541-II Podręcznik Użytkownika Pobierz pdf (Strona 30)

STEP

PROCEDURE

ILLUSTRATION

11

Connect

positive

lead

of

DMM

to

pin

3

of

J5

(A).

Observe

DMM

while

placing

power

switch

to

ON.

Does

DMM

indicate

0.0 to

+0.8

V

when

the

red

LED

is

illuminated?

YES

Place

power

switch

to

OFF.

Fault

lies

in

Drive

Unit

PC

Board.

Repair

or

replace.

NO

Place

power

switch

to

OFF.

Fault

lies

in

Disk

Control

ler PC

Board

Repair

or

replace.

12

Using

two

short

lengths

of

wire,

carefully

connect

pins

1

and

2

of

J7

to

pin

1

of

P7.

Place

power

switch

to

ON.

Using

a

third

piece

of

wire,

short

sequentially

between

pin

1

of

P6

and

each

of

the

test

points

indicated

below.

Observe

read/write

head

while

shorting

each

test

point.

1.

J7,

pin

4 (A)

2.

J7,

pin

5

(B)

3.

J7f

pin

3

(C)

4.

J7,

pin

6

(D)

Verify

that

the

read/write

head

moves

toward

the

front

of

the

VIC-1541.

Repeat

the

procedure

in

reverse

order

and

verify

that

the

read/write

head

moves

toward

the

rear.

Does

the

read/write

head

move

in

the

proper

direction?

J7

P6

YES

Place

power

switch

to

OFF.

Proceed

to

Step

13.

NO

Place

power

switch

to

OFF.

Fault

lies

in

Drive

Unit.

Page

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