Trouble Shooting; No Power; No Picture From Monitor Output - Marantz SR7300 Service Manual

12. TROUBLE SHOOTING

No Power

Standby
no
LED Lights up in
standby mode
yes
FLD shows no
PROTECT
?
yes
no
Supply +15V
to PU04?
yes
no
Supply +24V
to PU04?
yes
PU04 has any problem.
QU01(76p or 77p) lnput level
is too Low.
No picture
from Monitor output
no
VCR1&2 out
are OK ?
yes
Video Input select circutes
have problem
Power supply circuite (P854)
has any problem.
To be check +5VL or
_P_DOWN signal.
Vkk or FL is not supplied
to PC04
no
Can PY04
supply +15V ?
yes
no
Can PY04
supply +24V ?
yes
Connection has
PB04 or Sub Transf (LB01)
problem
OSD menu is
shown?
yes
OSD ICs control is no problem
Video output stage are no problem
Input to OSD IC(QL03) has any trouble.
Video input detection has any trouble.
To be ckeck VSYNC or QL02
Relay
(LB02:PB04)
control is OK ?
PY04,or Main Transf(L001)
has any problem
has any problem
no OSD IC (QL03) or have
driver QL04, QX04 have
any trouble
57
no
PB04 , or connection has
any problem
yes