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MPEG P. W. BOARD OPERATIONAL
(Check wave form)
@
IIC - BUS signal (ICIOI
Pin 5,6)
IIC-BUS SIGNAL-TIMING
.+
r
I
RESET DVD
T
lco15pln15
w
7
stopped
NoRq 54
w.
C",
WILT"
w m? v
'%&d
v
am"
RESET DVD
IC015 pln15 rn
!+
ICI 01 pln6
*
..!.
,
"'''"5tir5r5
s7.pPM
$Kuul 54 SI*
w
d
"
w
d
v
%'A'A
v
%/a"
ICO15 pill 15
ICI 01 Pln6
Iclil
Din5
@ FRONT comrn.nication
Performs
the communication
between
IC102 (EEPROM)
and ICO02 (video
encoder).
An unsuccessful communication
fails to proceed to the next step. Compare the
waveform of this part with the following waveform or that of a good unit.
If there is an abnormality, check the communication
destination
(IC1 01, ICO02)
andlor micon
Port.
IIC-BUS SIGNAL
4
v
I
I
I I I I I 1 I I I I I I [
+
I
1:
*
. . . . . . . . . . . . . ., .,,,,,,,
s+
call
5,0,
,
Cl12
5,W
"
CW3'5TI
w
- In the absence of the indication despite the presence of the above
CN80i pln6 ~
waveform,
the
effect
of
static
electricity
or
the
difference
in
voltage
VFD_CS
,=
from
that of the device connected (the presence of difference in voltage
CN801 ph?
large
enough
to
cause an
electrical
shock)
is conceivable.
In the
case
VFD_DO
w
of an
independent
failure,
a mere
open
or touch
is suspected.
CN801 pb13
- When
a tactile
switch
is
not
accepted,
check for a flux rise at the
VFD_DO ~
tactile
switch.
An abnormal VFD DO signal (pin 3 of CN81 O) prevents
KEY signals from being accepted.
CN801 '104
VFD_CLK
4.=
t
POWER SW ON
—
-51-
;.
I
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Troubleshooting
