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TM200 Service Manual
- 22 -
CP
U
per
i
p
heral
l
o
gi
c ci
rcu
i
t
s
RA
M (128K byte
)
R
A
M i
s
used
f
o
r t
e
mpor
ary
stor
ag
e of
th
e f
o
ll
owi
n
g:
Data
recei
v
e
d fr
om the i
n
t
e
rface
(
r
ecei
v
e
b
u
ffer
)
Pa
tt
ern d
a
t
a
pr
int
e
d
b
y
the
pri
n
t
head
uni
t
(p
ri
nter
b
u
ff
er
)
Da
ta used
f
o
r
CPU
r
out
ine
s
(
f
l
a
gs,
poi
n
ter
s
,
et
c.)
Fla
s
h
memo
ry (2M or
8M
bit
s
)
A p
r
i
n
ter
cont
ro
l p
r
ogram an
d
cha
rac
t
er
gener
at
or d
a
t
a
i
s
wri
tt
en int
o
fl
ash memory.
The
co
ntr
o
l
pro
gra
m
contr
o
l
s
b
a
sic p
r
i
n
ter
op
erat
io
ns, and
all CPU
cont
rol
is
perfo
r
med
in
ac
cord
anc
e
wit
h th
is p
r
og
ram. Another
flash
m
e
mor
y
wor
k
s as a
sub
-
memor
y
for
such
i
t
ems as e
x
p
a
nding
char
a
ct
er g
enera
t
or
d
a
ta.
R
S
-
232C
in
t
e
rf
ace s
p
e
c
i
f
i
c
ati
o
ns
Sel
ect
ion
b
e
t
w
een t
w
o si
gnal
s (pi
n
6 (DSR) or
pi
n 25
(INI
T)) i
s
possi
b
l
e.
TM200
Co
ntrol Circuit
Ther
ma
l he
ad
d
r
ive
r
cir
c
uit
T
he pr
int
head
of t
he r
eceip
t
p
r
i
n
te
r mechan
i
sm is a
ther
mal
typ
e pr
in
t hea
d wi
th
576
d
o
t
s
per
li
n
e
.
A
l
l p
r
i
nt h
e
a
d c
o
nt
r
o
l
is p
e
rfo
r
m
e
d vi
a
a g
a
te
a
rr
a
y
.
A
dr
iv
e
r
is
b
u
ilt
in
t
o
t
h
e
pr
in
t
he
a
d
,
an
d
send
ing
of p
r
i
n
t si
gnal
DATA-IN, wh
ich i
s
sync
hroni
z
ed
wit
h
t
he
CLOCK
sign
al,
to t
he d
r
i
v
er
sets
t
he pr
int
/
non-p
r
i
n
t st
atu
s
of each
d
o
t
.
Da
ta
is
co
nf
i
r
med
by l
a
tch sig
n
al #LATCH
. Pr
int
t
i
me con
tro
l
is p
e
rfo
r
m
e
d b
y
#
STROBE
1 a
n
d
#
STROBE
2,
w
h
il
e
e
n
e
r
g
i
z
i
n
g
ti
m
e
is c
o
n
t
r
o
lle
d
by
th
e
ga
t
e
a
r
ra
y
.
Changes i
n
head
te
m
p
erat
ur
e cau
s
e
s
f
l
uctuat
io
n of t
he resistan
ce v
a
lu
e of th
e
ther
mist
or bui
l
t
i
nto
t
he
hea
d, whi
ch
i
s
o
u
tp
ut as temperature sig
n
al
THERMISTOR
.
Pap
e
r
f
e
ed
m
o
to
r dr
iver c
i
rc
uit
T
he pa
per
feed
mot
o
r
is co
nstant
-current d
riv
en by a
speci
al
-
p
ur
pose I
C. Th
e
ener
giz
i
ng
d
i
r
ecti
o
n swi
t
c
h
ing
sig
n
als (PH1,PH2,PH3
and
PH
4) fr
om the CPU
. T
he
spec
ial
-
pur
p
o
s
e
IC
c
o
n
t
r
o
ls th
e
p
a
pe
r
f
ee
d
m
o
to
r
i
n
ac
c
o
rd
a
n
ce
w
i
th
th
e
s
e
si
gn
a
l
s
u
s
i
n
g Q
1,
Q
2
,
Q
3
,
an
d Q
4
s
i
gnal
s
.
A
ut
o
c
ut
te
r drive
r c
i
rcuit
T
he auto
c
ut
ter
d
r
i
v
e
r
use MOSFET
to control DC motor
.
De
tec
to
r
ci
r
c
ui
ts
Pa
per
e
n
d se
nsor
ci
rcu
i
t
T
he the
r
mal
pr
int
e
r mecha
nism i
s
equi
pped
wi
th a
pap
e
r
end
senso
r
, whi
ch i
s
conne
cted
v
i
a
swi
t
ch
cir
c
ui
t boar
d
a
ssem
b
l
y
to
the
m
a
in c
i
r
c
uit
boar
d
u
n
it
. The
pap
e
r
en
d
sign
al
FP_Sensor
i
s
i
n
put t
o
th
e DSP’s
p
o
rt
.
C
o
ver ope
n
se
nsor
c
i
rc
ui
t