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(6)
Remove the ribbon idle gears A and B. (Fig. 3-12)
(7)
Unhook the ribbon select arm
spring
and remove
it.
Remove the ribbon select
arm.
(Fig. 3-12)
(8) Remove the ribbon pulley.
(Fig.
3-12)
(9)
Remove the
intermittent winding
lever and then the intermittent winding
cam. (Fig 3-12)
(10)
Remove the E-ring from the shaft and
slide
the ribbon
winding gear assembly
out.
(Fig.
3-12)
(11)
Remove the two pinch rollers.
(Fig.
3-12)
(12)
Remove the timing belt. (Fig. 3-12)
i
RIBBON
SELECT ARM
SPRING
~
r
RIBBON/
SELECT
ARM
PINCH
·
·ROLLER
RIBBON
PULLEY
I
-
10
-
RIBBON IDLE GEAR B
RIBBON
WINDING
GEAR
ASSEMBLY
PINCH
/ROLLER
INTERMITTENT
/WINDING
LEVER
-INTER-
MITTENT
WINDING
NAIL
"'
INTERMITTENT
WINDING
CAM
Fig
3-12
4. ADJUSTMENT
OF THERMAL HEAD VOLTAGE
All
thermal heads for this unit do not have the
same
resistance
.
When the thermal head is replaced, adjust the thermal head
voltage
by the following procedure. DC digital
volt-
meter
and a small
screw driver
are
required.
Step
1
Step
2
Step 3
Step 4
Turn the Power
off
CN113
.
I I
I
left pin
/
right
pin
middle pin
Create a short
circuit
between
the middle pin and the right pin of
CN113
on
the Main P.C.B.
Connect
a
DC
digital
voltmeter with the
left pin
and
the
shorted
pins
of
CN113
.
Power
on with
using AC
adaptor
.
Set
thermal head
voltage by
rotating
variable resistor
VR101
on Main P.C .B according
to
the specified vol-
tage which
corresponds with
the
resistance
of the individual
thermal
head.
Refer to the following
specified voltage table.
(Note)
Specified
voltage
has
±0.03V
tolerance
.
Specified voltage
table for thermal head
(Revised)
Resistance of thermal head
Specified voltage (
±
0.03 V)
55!1
6.81
V
56!1
6.84
V
57!1
6.88
V
58!1
6.91
V
59!1
6.96
V
60!1
6.99
V
51
n
7.03
V
62!1
7.08 V
63!1
7.12
V
64!1
7.16
V
65!1
7.18
V
66!1
7.23
V
67!1
7.28
V
68!1
7.33
V
69!1
7.38
V
70!1
7.43
V
71!1
7.48
V
72!1
7.53 V
73!1
7.58
V
74!1
7.63V
-
11
-
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