Service manual
19SV111
TROUBLE
SHOOTI~G
TABLE<continued)
Symptom
Repair Procedure
Location
of
Fault
(in
order
of
probability)
Normal Display Doesnlt Appear
1.
Check
soldering
and
make
sure
that
the
correct
(1)
Misadjusted
CSO
parts are
mounted
and
that
they
are
mounted
in
trimmer
capacitor.
the
correct
direction
near
resistor
R2
and in
the
(2)
Faulty
soldering
or
Poor
or
no
color
in asci
llator
circuit
(the
area
containing
X
1,
Q2
and erroneous
picture.
Q3).
mounting.
Adjust
trim
mer
capacitor
CSO
and
match
to
(3)
X1
normal
chroma frequency. (4)
ICS
PPU
Normal Display, But
Operation
Via Controller
Not
Possible
Game Select
symbol
1.
Is
ICS
PPU
faulty?
(1)
ICS
PPU
does
not
appear,
or
Faulty
IC6
CPU.
(2)
IC6
CPU
is
shaped
abnormally
if it
does
appear.
1.
Is
there
faulty
soldering
or
a
break
1n
the
(1)
MP1, MP2
Game Select
symbol
conductor
Pattern
in
MP1
or
MP2 ?
(2)
C7
keeps
moving.
2.
Is
there
faulty
soldering
or
a
break
in
the
(3)
IC6
CPU
conductor
Pattern in
IC7
or
IC6
CPU
?
Faulty
IC7
or
IC6
CPU.
1.
Is
the
controller
harness
secu
rei y connected ? (1)
IC7
Controller
I
2
Is
there
faulty
soldering
or
a
break
1n
the
(2)
Faulty
soldering
or
a
is
inoperable
conductor
Pattern near
IC7
or
IC6
CPU?
break
in
the
(Game Select
not
Faulty
IC7
or
IC6
CPU.
conductor
pattern.
possible).
(3)
IC6CPU
(4)
MP1, MP2
1.
Is
the
controller
harness
secu
rei y connected ?
(1) 1(8
Controller
II
2.
Is
there
faulty
soldering
or
a
break
in
the
(2)
Faulty
soldering
or
a
is
inoperable
conductor
Pattern near
1(8
or
1(6
CPU
?
break
in
the
Faulty
ICB
or
I
C6
CPU.
conductor
pattern.
(3)
IC6CPU
(4)
MP1, MP2
14