AIWA NSX-A505 Service Manual - Page 5

In

such

a

cart,

check

also

if

the

POWER

AMPLIFIER

circuit

or

power

supply

circuit

has

any

abnormalities

or

not.

2-2.

Regarding

reset

There

arc

cases

that

the

machine

does

not

work

correctly

because

the

MICROCOMPUTER

is

not

reset

even

though

the

AC

power

cord

is

to•

insetted,

or

the

software

reset (pressing

the

STOP

key

+

POWER

key)

is

performed.

When

the

above

described

phenomenon

occurs,

it

can

leads

to

wrong

judgment

as

if

the

MICROCOMPUTER

is

defective

and

to

exchange

the

MICROCOMPUTER.

In

such

a

case,

perform

the

forced

-reset

by

the

following

procedure

and

check

good

or

no

good

of the

MICROCOMPUTER.

O

Remove

the

AC

power

cord.

te

FRONT C.B

et

-

‘

S,

r

18

15

CI

I3

VSS

MICRO.

COMPUTER

0

VDD

FRONT

C.B

1

.,.._.x

Short with

tweezers.

Fig

-2-2

®

Short

the

both

ends

of

the

electrolytic

capacitor

Cl

13

that

is

connected

to

VDD

of

the

MICROCOMPUTER

with

tweezers.

®,

Connect

the

AC

power

cord

again.

If

the

MICROCOMPUTER

returns

to

the

normal

operation,

the

MICROCOMPUTER

is

good.

Note:

The

reference

number

or

MICROCOMPUTER

pin

number

of

transistor

(Q110)

and

electrolytic

capacitor

(C113)

can

change

depending

on

the

models.

Be

sure

to

check

the

reference

numbers

on

schematic

diagram

before

starting

the

discharging

work.

2-3.

Confirmation

of

soldering

state

of

MICROCOMPUTER

Check

the

soldering

state

of

the

MICROCOMPUTER

in

addition

to

the

above

described

procedures.

Be

sure

to

exchange

the

MICROCOMPU1ER

after

surely

confirming

that

the

trouble

is

not

caused

by

poor

soldering

but

the

MICROCOMPUTER

itself.

—5—

AIWA NSX-A505 Service Manual - Page 5

Regarding, reset, Confirmation, soldering, state, MICROCOMPUTER

Page 5 highlights