Yamaha DVD-S550 Service Manual page 12

DVD-S550/DV-S5750
QQ
3 7 63 1515 0
B
Does sled
automatically move to inside
when it is outside ?
Does
Optical Pick Up move to find
TE a disc ?
L 13942296513
When read
disc, is Laser on OK ?
www
Is a disc loaded ?
.
Yes
C
12
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No
Yes
Check the copper trace or cable
connected to the DVD
mechanism
No
Yes
Check the cable and circuit
between the DVD mechanism
and MM1646
No
Yes
No
Laser off
x ao
y
i
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8
Is signal
STBY (Pin 1 of MM1646)
high level ?
Yes
Is signal FMO
(Pin 5 of MM1646) more
than 1.4V ?
Yes
Are signals SL+
(Pin 11 of MM1646) & SL-
(Pin 12 of MM1646)
correct ?
Yes
Has FOO
(Pin 3 of MM1646)
Q Q
any signal?
3 6 7 1 3
Yes
Are signals F+
(Pin 14 of MM1646) & F-
(Pin 13 of MM1646)
correct ?
Yes
Are signals LDO1
(Pin 23 of MT1389) & LDO2
(Pin 22 of MT1389)
correct ?
Yes
Is voltage
of +L_V33 OK ?
Yes
u163
.
2 9 9 4 2 8
No
Check the STBY circuit
No
Check the FMO circuit
No
Check MM1646 and
peripheral circuit
1. Check the signal from
No
MT1389 to MM1646
2. Maybe MM1389 is not
1 5 0 5 8 2 9 9 4
working
Check the peripheral circuit of
No
MM1646
Check peripheral circuit of
MT1389
No
Check peripheral circuit of
two transistors (Ref 7106
& 7107)
Check peripheral circuit of
No
two transistors (Ref 7106
& 7107)
m
Check connection circuit of
the DVD mechanism
co
Optical Pick Up may be
damaged
Board Ref Name
MONO 7111 MM1646
MONO 7112 MT1389
9 9
2 8 9 9