Sharp 4M-IOM Servicehandleiding - Pagina 6

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TROUBLE SHOOTING TABLE

NEITHER IMAGE NOR SOUND COMES OUT

Is fuse F701 normally functioning 7

Are the secondary outputs ( + 5V. -8V, + 13V,

Check L703 and L704.

primary oscillation

circuit of T701.

Continued to the following pages

Replace fuse F701.

Fuse F701 easily blows out.

Check the peripheral parts of 5701 and

for a short-circuit.

TROUBLE SHOOTING TABLE

Yes

Are voltages applied at

of tuner (corresponding

Check the AGC

Push the CH UPlDN

buttons in search

mode. Does the BT

voltage at pin (4) of

tuner change?

Does the voltage go

up as the channel

numbers go up ?

Check C107, R523, R501, C501

and their peripheral parts, as well

as the Pin (20) line of IC 401.

(Continued)

Prior checks:

N o

Are the voltages of

normal?

Yes

N o

Are the voltages at

pins (16) (19) and (30)

of IC802 normal ?