Marantz SR-12N1G, Service Manual

Page: 55 / 76

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