Philips DCC170/00 - CPU and LSI Communication Tests

Step 3.
CPU
<+
lC's
Communication
(Bus
Line
)
test
[SelÍ
Diagnostic
(Factory/Service
Mode)]
In
Service mode,
the CPU checks
Íor
circuit integrity
and
displays the
test
results
on the LCD.
Use this
mode Íor
quick
Íault isolation'
.
Digitat Error Rate Display
How
To
Enter
Service
Mode
1.
Set
to
"Factory
mode".
2. With
the
LCD
shown
"FACTORY
024D,
press
the
"TEXT"
button,
and
"SERVICE
MODE"
will
appear on
the
LCD.
LCD
-+
trsERVtcEIMoDEfl
Note: Pressing
the
"TEXT"
button
again,
returns
the
mode
to the
FACTORY
MODE.
o LSl, DRP
SFC and
DAIO
Communication
Test
The CPU is
connected
to
its
peripheral
lOs
(DRP,
SFC
it is necessary
to determines
which
lC
out of
DRP, SFC
and
DAIO) via
a
parallel
bus consisting oÍ
clock, data,
and
DAIO
(including
their
peripheralcomponents)
is
and control
lines. lÍ
an
"NG"
message is displayed on
defective.
The
Ílowcharts on the
following
pages
provide
a
the
LCD
as
a
result oÍ self diagnostics
in
Service
mode,
quick
troubleshooting
guide
to
locate
the defective
lO(s).
-
2s
-
PCs
79 z*s
COUNTER
button
operation
count
Test item LCD message
Remarks
1
(LCD)
test
(All
LCD's
light
up.)
2
L3 BUS
communi-
cation
test
L3 BUS
OK or
L3 BUS NG
See commu-
nication Test
on
pages
25-27.
3 DRP
communica-
tion
test
DRP OK or
DRP NG
4
SFC communica-
tion test
SFC OK or SFC
NG
5 DAIO
communica-
tion test
DAIO
OK or
DAIO
NG
6 Total
error
rate Displays
number
of
errors
generated
in
32
segments
(for
1.3
sec.)
in hexa
decimal.
See
Digital
Error
Rate
Display.
0-
n
rdind
00
Inc
licat
0(
ndi
0-
4567
ch
J+ J+
0000
tes
main
d
AUX data
YS
INFO
d
RRECTIO
LIABLE data
.
Meaning of data error codes
0-000-00000000
0-000-00101000
EX:
OK
0-001-00000000
t-
(AUX
data error)
0-010-00000000
+
I-(SYS
INFO data error)
0-000-01101000
1-111-11111111
9-999-99999999
A-AAA-AAAAAAAA
F-FFF-FFFFFFFF
Main data error
lf
the
data
error
code
is
"NG",
check test
Step
4.
O-Oon
page
28.
0
+
0
nl
'
Ind
ndici
licatt
esU
)rror.
L data
oaïa e
,
grror.
Jata
N FAI]
lata
errc
ata
,l
Fl
lrca
9Sr
;S\
)oF
ELI
| 23
J+
)00
Indi<
cater
rtes
{
's
C(
NRE
01
.t+
c0
l-
I
l-
lr
rdic
icatr
rtes
UN
EX:
NG