Philips DCC170/00 - Page 28

(1)
Locating
the
deÍective
division
oÍ LSI
communication
test
(Clock
Line:
"L3BUS
NG")
"L3BUS
NG" is
displays.
Unsolder
pins
@
to
@
of
Qs01(DRp),
pins
@
to @
of
Qssl
(sFc)
and
pins
@
to @
of
QAol
(DA|O)
"L3BUS
OK'
appears when
the
unit
enters
Service mode.
Solder
pins
@
to @
of
Qs01
(DRp).
Enter
Service
mode
again
(see
"How
To
Enter
Service
Mode"
on
page
19).
DRP
(0501)
or
its
peripheral
logic is
defective.
"L3BUS
OK"
displayed?
"L3BUS
NG"
displayed?
Solder
pins
@
to @
of
Q5S1(SFC).
Enter
Service
mode
(see
"How
To Enter
Service Mode"
on
page
19).
SFC
(Q551)
or its
peripheral
logic
is
defective.
''SFC
OK"
displayed?
"SFC
NG"
displayed?
Solder
pins
@
to @
of
QAol
(DAIO).
Enter
Service mode
(see
"How
To Enter
Service Mode"
on
page
19).
DAIO
(OA01)
or its
peripheral
logic
is
defective.
"DAIO
OK"
displayed?
"DAIO
NG"
displayed?
The
clock lines
connecting
to DRP,
SFC and DAIO
are all normal.
PCS
79 286
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