Trouble Shooting - Marantz SR-12S1 Service Manual

13. TROUBLE SHOOTING

No Power
No Picture
No Power
no
Standby LED
Lights up on
standby mode?
yes
no
FLD Light ON ?
yes
no
FLD shows
PROTECT ?
yes
Power amp circuit P114,154
has some problem.
QU01(107p) lnput level is
too Low.
No picture
from Monitor output
no
VCR1&2 out
are OK ?
yes
Video Input select circuits
have problem.
Power supply circuite (PB04)
has some problem.
To be check +5VL or
PDOWN signal.
Vkk or FL is not supplied
to PU04.
no
Supply ±B,
±18V
to P114,154 ?
yes
no
OSD menu is
shown?
yes
OSD ICs control has no problem
Video output stage has no problem
Input to OSD IC(QL04) has some trrouble.
Video input detection has some trouble.
75
Check POWER ON
or PL signal.
Main Transf(L001)
or P834
has some problem.
OSD IC (QL04,) or
driver QL03,04,QX05,07
have some trouble.