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MPEG P.W.BOARD
OPERATIONAL
(Check wave form)
~
DRAM(ICI
17) - MlCON(lC116)
communication
DEFECTIVE:
DRAM ACCESS
,,'?PP<.
IC11632
w
%
IC11631
W
ICI1634
G
ICI 1636
%
NON-DEFECTIVE
UNITDRAMACCESS
stopped
* s,,
[ WIO?V
CK?103V
w.,,?"
%!$,!A"
?m.la"
IC11632
m
cc
IC11631
-
IC11634
w
lCit636
%
DRAM
ACCESS
signals different from those shown below (constantly
LOW or HIGH,
for instance)
are unacceptable.
@
Each RESET
signal and Timing
RESET SIGNAL,AC
POWER
ON
1
REsET DRIVE
lC015 mn7
~
+
AC PC) WERCIFF
RESET SIGNAL, POWER SW ON
""~1
':''''"w~
. . . . . . . . . . . . . . . . . . . . . . f. . .+....+
. . . . . . . . . . . . . . . . . . .
NON-DEFECTIVE
UN IT:DRAM ACCESS
ICI1632
m
%
IC11631
*
IC11634
+
ICI1636
w
AC POWER 0N(+5V)-TIMING
+5V =
RESET VENC
AC (3N
IC015 pin12
RESET AE)AC
IC015 Dlnlo
*
4
RESET DRIVE
T
ICOI 5 pln7
++
The respective
ICS are reset at the timing shown above.
No or
incomplete
resetting makes the relevant
IC inactive or unstable in
operation.
In the case of a DAC, for exmaple,
distorted
or noisy sound will
result.
With
a video
encoder,
unnatural
colors
or unstable
synchronization will result.
REsET DRIVE
T
lCOl 5 pln7
"t
POWER SW ON
-50-
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Troubleshooting
