Spectravideo MKI, Сервисное – Техническое руководство

Страница: 17 / 134

ADDRES S:
XXXX
DATA WRITE:
YY
DATA W R ITE: YY
address
of
the memory loca t ion a t wh ich
an error is found.
da ta wr itten to the loca t ion addres se d by
the
ab ove
address .
data read from the loca t i on addre s se d by
the above address .
Te st pa t te rn set: OO , Ol,02,
. • • • • •
FC,FD,FE.
4 . If no errors occur in the testing of PSG, the messa ge ' PSG OK' i s g ive n,
and fol lowed by three tones. However, if
'PSG
ERROR ' is g iven , i t means
tha t the PSG ch ip is not funct ion ing propert y.
5 . S o und Channe l is on f or few seconds ( no list ing g iven in th is stage ) .
6.
VD P INTERRUPT tes ting:
VD P INTERRUPT OK
VDP INTERRUPT ERROR
7 .
CASSETTE L INE tes t i ng:
VDP chip funct io ns p rope r l y .
VDP chip
is
not func t ion ing prope r l y .
If there is no error, "CASSETTE LINE OK" message is p r in ted , otherw i se
"CAS SETTE L INE ERROR" message is p r i nted
t o
indica te CA SSETTE LINE i s not
func t i on i ng p roper l y.
The re a re our ways to te st CASSETTE LINE, the proce dures are as fol low s:
(a ) input CASW=O ( low ) , ou t put CA SR= l (hi gh ) , if not , "ERROR , TEST
1----CASW /CASR" message is p r inted input ME=O ( low) , ou tpu t R E= l
( h i gh )'
if no t , "ERROR, TEST 1----ME /RE" messa ge is p r inte d .
( b ) input CASW=O ( low ) , output CASR=l (high ) , if not , "ERROR, TEST
2---CA SW / CA SR" is p r i nte d input ME=l (h igh ) , output RE=O (low ),
if no t, "ERROR , TEST 2----ME /RE" is pr inte d .
( c ) input CASW= l (h igh ), ou tput CASR=O ( l ow ) , if not , "ERROR TEST
3----CA SW / CASR" is p r i nted input RE=O ( low ) , ou tput ME:l (h i gh ),
if no t , "ERRO R TEST 3----ME / RE" is pr inte d .
( d) input CASW=l (h igh ), out put CASR=O ( low ) , if not "ERROR , TEST
4----CA SW / CA SR" is p r i nte d input ME= l (h igh ) , ou tput RE=O ( low ),
if no t, "ERROR, TEST 4----ME /RE" is pr i nte d . A "CASSETTE L INE
TEST ING COMPLETED" is pr inte d at the end of the tes t, th i s
mes sage i s p r i n ted when e r ror occurred on l y .
3.2