Marantz SR-12S1 Service Manual download pdf (Page 55)

75

no

yes

no

yes

no no

yes yes

No Power

Standby LED

Lights up on

standby mode?

FLD Light ON ?

Power amp circuit P114,154

has some problem.

QU01(107p) lnput level is

too Low.

Check POWER ON

or PL signal.

Main Transf(L001)

or P834

has some problem.

Vkk or FL is not supplied

to PU04.

Power supply circuite

(PB04)

has some problem.

To be check +5VL or

PDOWN signal.

FLD shows

PROTECT ?

Supply ±B,

±18V

to P114,154 ?

No Picture

No Power

OSD IC (QL04,) or

no

driver QL03,04,QX05,07

have some trouble.

yes

no

yes

Input to OSD IC(QL04) has some trrouble.

Video input detection has some trouble.

No picture

from Monitor output

OSD menu is

shown?

Video Input select circuits

have problem.

VCR1&2 out

are OK ?

Video output stage has no problem

OSD ICs control has no problem

13. TROUBLE SHOOTING

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