Service manual

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XG-XV1

E/A

TROUBLE SHOOTING TABLE

(Continued)

I

Checking the PLL

circuit

and its peripheral

circuits

1

I

T

--B---_----e---_

I

t

iC8020 or its peripheral circuit faulty. ,

I

--,-------------I

1

Yes

I

Is there signal at pin (236) of

IC8020?

No’

I

I

I

------,1------m,

t

lC8026 or its peripheral circuit faulty.

I

I

1

Yes

0;

----------------I

----------__--__

1

Yes

’

IC8020

or its peripheral circuit faulty.

t

I

Is there signal at pin (15) of

IC8051?

No:

----- ----------_I

I

Yes

I

------_---__--__

I

t

IC8015

or its peripheral circuit faulty.

t

I

------_---______I

I

Check the video circuit and its

t

I

peripheral circuits.

I

--,-------------I

I

Is image as specified at resolution

No

above XGA level?

Yes

----------__-___

r

Check the XGA video circuit and its

i

+

;

peripheral circuits.

I

-

-

,------------_I

Is image as specified at resolution

No

below XGA level?

Yes

I

B-e--------_---_

,

Check the VGA video circuit and its

t

ip

a video system. Is the

No

as specified?

L

31