Specifications
TROUBLESHOOTING
PROCEDURE:
Run
the
Diagnostic
Test
Routine." a fault
is
discovered.
then
the
FAILURE
display
will indicate
the
ICs
most
likely
to
have
failed.
Replace
these
ICs
. "
this
does
not
solve
the
problem.
or
if
you
are
unable
to
run
the
Diagnostic
Test
Routine.
follow
this
Troubleshooting
Guide
.
AC
Adaplor
Unplug
concentrIC
plug
01
AC
Adaplor
from
Measure
16-20
VAC
between
cenler
aM
fear
of
Master
Component.
Plug
AC
Adaptor
Duler
sleeve
01
AC
Adaptor.
Inlo
ill
live
120VAC
60Hz
oullet.
NO
Replace
AC
Adaplor .
Measure
abou'
-11V!.'
TPS
wl,h
MIC
0"
.
YES
Depress
Reser
Bullon
S
1.
Voltage
al
TP8
should
1)0
to
OV
wh
i
le
51
pressed
.
NO
NO
Remove
Reset
Bunon
S1
It
vOllage
does
nol
appear.
then
check
for
shOrted
(races
Replace
Resel
Bullon S
1.
between
51
aM
Power
Supply
Board
.
Re-
place
Power
Supply
Board
,
-
to
logiC
Board
SchematIC
IFigure
Measure
3.579545
MHz
al
4
Vp-p
at
TPIQ
.
.
measure
7
15909
MHz
al.V
peak
·
at
Ipg
.
NO
NO
•
Rem
o
ve
STIC
chia U •.
II
Si
gnal
appears
.
Replace
e'YSlal
)(1
Check
C
17
and
C16
.
replace
U4
"
51
.
11
no
s.gnal
check
l
Or
Replace
UtO
Wi
th
a
known-gOOd
one
.
shoneo
[races
,
Replace
UIC
.
.
t
Remove
.nycari;~;~~~?!{~~l~f~!~'l
With
cartridge still
removed
.
check
'0'
Check
for
prager
at
IBeI).
proper
waveform al
TP18
(8Cl
oun
TP19
IP.6
ISC21
and
TP17
I
BOIR!.
The
RESET
fBC2
DUn
and
TP20
IBOfR
oun
Ihe
RESET
bullon will
netC!
10
be
pressed
every
few
bullon will
need
to
be
pressed
every lew
secondS
so
the
waveform
does
no.
disagpear
.
seco
n
os
so
Ihe
waveform
does
not disappear
10
NO
Replace
.
In
the
lollow.ng
oraer:
U1.
U2
.
then
-
C
he
ck lor
oroken
or
ShorltO
PC
traces .
CheCk
U9
.
for
shorted
or
bent
pms
at
game
cartridge
Sockel
JI.
Rep
l
ace
U9
.
-
-12-
Power
Supply
YES
Disassemble
Master
Component
10
reveal
YES
~re
16
·
20VAC
across
TPl
and
TP2
In
YES
Ihe
Power
Supply
Boarel
allact'Ie<J
to
lhe
logiC
6.
Board
.
Plug
known
-
good
AC
Adaptor
inlO
Master
Componenl
.
NO
Check
AC
Jack
J2
.
C38
.
C39
. Flail(! tall
If
aces
belween Jl
and
Power
SUpply
BoarO
. "OK.
replace Power Supply Board.
P;;;-
and
"Ie
...
RESET
S~~~~dn
wi'h,n
YES
Witn
reterence
to
Ground
(TP3)
measure
:
YES
seconds
.
Voltage
.11
TP8
be
about
••
-11
'0
-2.4
VOC
"
TP4
-5VDC
.
b
-545
fO
-5.95
VOC
.,
TP5
c
-11
.5
fo
-12
.5 VOC"
TPS
1.
-485 '0
-5
.• 5
VOC
"
TP7
ND
Check
Ihill
Reset
Bullon
IS
nOI
making
inler-
mlltam
conlaCI.
Replace
Power
Supply
Board
~power;
with a
known-oood
one.
II
problem
is
slill
With
a known-
apparen!.
Inen
taul!
is
in
LoOic
Board
.
Con-
gOOd
one
If
is
not
measured
.
l.nue
lollowlnQ
Sleps
;n
this
Troublesl1Ooting
Inen
taul!
.s
.n
.
Conllnue
tollow-
Guide
.
inQ
steps
10
this
19
Guide
.
..!!.!..
Measure
1.789n2
MHz
at5Vp-p
.11
TP11
and
...!!!.
Measure
1.789772
MHz
at
IOVp-p
al
TP13and
YES
TP1
1.
TP'.
NO
,
Replace
In
lhe
follOWing
order
:
u_
,
U2
.
Ug
,
-
Repla
c
e.
In me
101l0wlng
oraer
:
U1.
then
U9
or
U3
..
YES
Plug
cartridge Into
game
socket.
Check
10f
YES
II
problem
IS
nOI
solved. continue with
Ihe
proper
waveform al
TP21
(BCl
IN).
TP22
Symptom/Remedy
guide
starting
on
the
fBC2
'NI.
.nd
TP23IBOIR
INI
.
nUl
page
.
ND
RecheCk
sionals
at
IP18.
TP19
.
and
TP20
. If
OK.
check
game
socket
Jl
and
game
car-
tridge
ton
a
knawn-good
M/C)
. II
Signals
ilft
nOI
OK
.
reglaee
0.4
. then ti6.
-13-