Yamaha DVD-S550 Service Manual page 11

QQ
3 7 63 1515 0
Is logo displayed
on TV screen?
TE
L 13942296513
Does the tray
automatically close when
www
.
http://www.xiaoyu163.com
A
No
Yes
at connector (Ref 1301) in
Check TV connection cable.
No
it is open?
Yes
x ao
y
i
B
http://www.xiaoyu163.com
8
Is
No
Main Clock
normal ?
Yes
Is
No
reset signal
normal ?
Yes
Is signal
No
on FLASH (Ref 7303)
normal ?
Yes
Is signal
No
on DRAM (Ref 7302)
normal ?
Yes
Is image signal
No
Mono Board normal?
Q Q
3 6 7 1 3
Yes
Is image signal
No
at output terminal in AV
Board normal?
Yes
Are signals TROUT
(Pin 48 of MT1389) and TRIN
(Pin 49 of MT1389)
correct ?
Yes
Are signals
TRCLOSE & TROPEN
correct ?
Yes
Are signals
LOAD+ & LOAD-
correct ?
u163
Yes
.
Check the circuits connecting
to the DVD mechanism
DVD-S550/DV-S5750
2 9 9 4 2 8
Check 74HCU04 (Ref 7103) and
peripheral circuit.
Check NCP303 (Ref 7102) and
peripheral circuit.
Check peripheral circuit of FLASH (Ref 7303)
Check peripheral circuit of DRAM (Ref 7302)
Check MT1389 (Ref 7112) and
peripheral circuit.
1 5 0 5 8 2 9 9 4
Check video filter circuit and
amplification circuit in AV board.
No
Check the position-switch on
the DVD mechanism
No
Check the circuit between
MT1389 and MM1646
No
Check MM1646 and peripheral
m
circuit
co
Board Ref
MONO 7111
MONO 7112
9 9
2 8 9 9
Name
MM1646
MT1389
11