Akai AX80 Service Manual page 52

MODEL: AX80
No.
AX80/1
DATE: April 1985
001 Subject:
To improve performance
To improve sound quality, Voice Control
IC (IC106
-
806 in
Voice
P.C. Board)
CEM3372B has been changed to CEM3372C. The program
of
ROM IC (IC4 in CPU
P.C. Board) UPD2764D-I has also been changed
to uPD2764d-K.
IC106 -
806
Part
No. IC4 Part
No.
Old CEM3372B EI-354184 UPD2764D-I EI-354145
New CEM3372C EI-359630
UPD2764D-K EI-359631
When
one
of
Voice Control IC is changed from Old type
to New type and vise
versa,
it is
necessary
to
replace all Voice Control ICs and ROM
IC at the
same time.
Changed from
:
January 1985
Interchangeability
:
Not interchangeable
The following shows how
to
identify old and new
ICs.
8-TYPE-
INOCATING
LOT
NUM8ERS
INDICATING
TYPES
C
-TYPE
1
CEM 3372
1
CEM 3372
1
CEM 3372
T
8425 31608-01
T 8427 31608-01
X
3060C-01
1
-x-
k
1
<*
INDICATING
PROGRAM
VERSIONS.
-
1
-