Service manual
1526
•
MPS
802
ROM
UPGRADES
The
PCB
for
these printers was designed
to
accommodate a
24
pin ROM or
28
pin EPROM at location
USD. A
jumper
change at J
1-J4
will configure
the
board
for
either I.C. When changing chips at
this
location,
match
the
jumpers
to
the
type
of
I.C.
CLOSED
J1
~
.-~
J2
CLOSED
OPEN
J3.
• • •
J4
OPEN
U8D
24
PIN
ROM
OPEN
J1.
• • •
J2
OPEN
CLOSED
J3
•
~
~
J4
CLOSED
28
PIN
EPROM
2 2
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2C
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---~
1526
•
MPS
802
SCHEMATIC
I
24