Basic HTML Version
'TEST/IDIIIAGN'OSTIC
PROCEiDUFlE:S (C:ontinued)
n'
no
sound
IS
Iheardi"
releno
the .ext en1lled -NO SOUNIDI ... ".
If ene
-ring" is,
neati'd" tnis
iindiCa.es
a, malfunct1ol'll
oUiIle 1U23, R:MM ChIp.
II' either
lwo
aUaur
"rings" illheard,-ti1!S Indicate's
a
pl:'o1ltelm
I:SSQoi'ated whh lIha U21 ROM
Chi'pl.
If
either ~ or five
'''(lings''
is heard,
this, tridiCahilS:
,8
problem
Wnh Ine U22' ROM' IOlrTp.
~
NO SOUND
,DUR,INJ3
ml:S' resT
(but sou
nd
can be fie
arc!
du
rin,gl the,
mag
nostic 1
ests}l.
ICheck 'ihe s,oundhs,e~ect InpulS (pins 2 through 9
Qif
U9~
tOI
see
i~'
'the'li pulse dur:ing Sound 'Test
10,11. ,Also"
chedc the
-12 V sUiPPIY 'vollag,s on the CPU IBoard, If'lhls voitage j,s low-(,er AC r1p;ple
seems,
too high,). pelioml'l
'thel fonowing
,checks:
t .
llhe
gil'sy
.and
gll'ay·g!'ieeln trans1Ofm'Elrseoondary
wires
f'Or
t9'.4 VAC.
2~, The CPU Board
filteul"
capaoi1or 026
fDr
~12:
vue,
3,,, The fiMet
,capacitor
026
f'Or
ex:c1es hf0 AC fip,p!e [o¥e-r
C1.7S,vAC,.
"'the
,pl'levi'OlllS ,ohecks drd
no~:
Isol'ale the' pT,obilem,
h,Jlnll
~tne Vc'hJmB'
Comrcd
fer max[mum
output.
MDmelif~8rily touCh .a
powe,md'lIJpi
Ale
soldering!
Ipencl on
~he center
UlIP'
·of:
the Votums'
C:Ql"lltrcru.
~
DO NOT l.!1Se:a sotderin;g ifOn over 40
rwaLtSi.
Nots,
arso that
a:lrdle!S~
$i:ldel"ing
irons
,willNOT
work
'[01
tltll '~t't.
.
Healiin,g ,Sllow hum
irmtl'ootes,
~l'Iat the power amplifier (U1
I
ID'A200:Z)", ~he
Vo'uma
Coli,troll',
and the
:speakier ars',oper;a:1i'ng
sa.i$t'aoto~i~y,
as, fs, the s~ound ~jrwit
cabling,
NOit hSlarJ:ng1
a, hum r,equires re-
pea~ffing the' test
with
~h.e' Volume!
'Control1umed
~a:rtI
w,a,y
d'o,wn" 101deterll'iiine whelhell'
'tlh.IlI'
Volume
IOontr,ol
~s 'fau Itlji.
AI'so,
check: th:9 cab~e, conn
SOlCHS
1'lo:r
p'rope,
ml'Ulngl
j
and
th l~
no, broken 'wires:
aHem Ihus, cJrc~~' .
FUSE
USTING",
The
f,olllowing
'fuses
al'\131
used:
P·allit
NU lmb81r DI8scr ip. :ion ,
Chl'culll/locat:h::m
57aO~09252J-OOI
IFuse.
8A Slow-e~ow (SH:!:),
12S,v Input P·owe-r
rhigh
!loltaget), UrleJCabinet
Box
t
573'
~Cl96S1-00'
FIU'SI,
SA
s-a,
250v
:51311-09'128,-00
Fuse'. ~HJ2A S:~B"250."
51:3'11
-O!i.l'128··00
Fuss, 2~UgA
S·S:,
250Y
5731
·09128,·00
Fuse, 2~'1I.2A S"B:, 250'
'1
5,731·,06314,·00
Fuse,
4A
5,.8,
250v
5,731·,08761·00 Fus,e,
1f-4A
S~B, 250V
5,731-,09071-00
Fuse,.
SA,
32'1
5,731·'063'~ 4,·00 Fuse, 4,)\ S-B, ,250v
5:'7'31 ·'0,91432·00 Fuse," A S· S" 2S0~
(1ien. II!lumina:1 iQmUi~:pfilr Ba.e'kioo)( fusiEll1lg'lde r
~,4'l
Outhole ok,w
iI:Ilower
P'la~fte~dfusaho,lder
.sol. '1'7'~Sot 20 okt~Upp(lrPlaryfield
fusehofd'er
S!:nl. 3A ,SA, 7A, 10,12.13 clefs/oR:.. 8'iboiX
'fuseholtier
Rotating Beaoons oKUCenter lJaokoox fus,ehDlder
,F'r
1)"8345-:554,
Powe'f
611
pply'
F3.
[I~B345-5:54
Po,war
SLI!lply
P2:. f4,~
DI.:93415 .•
554 P,ower
Sl.!l~ply
Ff;;:. F6;
D-8345 ..
554
IPrewar
Supply
• One 4A S'-iB. 250v"use (5,731·'0'6314·00)
8:
provrded
'fDf
an ov,erseas (220v)I,game'
:insta.llation.