Canon BJ-10E Service Manual - Page 85

Heater, Drive, Voltage, emperature, Controller

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Part 3: Technical Reference d) Heater voltage One of four heater voltage levels that determine the ink jet speed is selected to correct any manufacturing variations in the bubble jet head units. The heater voltage ID is indicated by the PCB pattern of the contact points of the bubble jet head unit, and is used to switch the heater voltage output of the printer heater drive voltage supply circuit. 0 ° dr Heater Drive Volta e ID Circuit 0 11 ID Circuit Pattern Heater Drive Voltage (VH) 20.4 V DC 21.2 V DC 22.0 V DC 22.8 V DC Figure 3-17 Heater Drive Voltage ID e) Temperature control The optimum temperature of the BJ cartridge ink for high quality printing is about 73.4°F (23°C). The bubble jet head unit has temperature sensors and warm-up heaters on the silicon plate. The printer determines the BJ cartridge temperature from the ambient temperature detected by the temperature sensor on the printer logic card. When it detects lower than 68°F (20°C), the bubble jet head unit nozzles are warmed by the warm-up heaters. /1 Nozzle Section 0000 0 ,Warm-up Heaters / I I 1 11 I Temperature Sensors Figure 3-18 Head; emperature Controller 3-17

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Part
3:
Technical
Reference
d)
Heater
voltage
One
of
four
heater
voltage
levels
that
determine
the
ink
jet
speed
is
selected
to
correct
any
manufacturing
variations
in
the
bubble
jet
head
units.
The
heater
voltage
ID
is
indicated
by
the
PCB
pattern
of
the
contact
points
of
the
bubble
jet
head
unit,
and
is
used
to
switch
the
heater
voltage
output
of
the
printer
heater
drive
voltage
supply
circuit.
0 °
dr
Heater
Drive
Volta
e
ID
Circuit
0
11
ID
Circuit
Pattern
Heater
Drive
Voltage
(VH)
20.4
V
DC
21.2
V
DC
22.0
V
DC
22.8
V
DC
Figure
3-17
Heater
Drive
Voltage
ID
e)
Temperature
control
The
optimum
temperature
of
the
BJ
cartridge
ink
for
high
quality
printing
is
about
73.4°F
(23°C).
The
bubble
jet
head
unit
has
temperature
sensors
and
warm-up
heaters
on
the
silicon
plate.
The
printer
determines
the
BJ
cartridge
temperature
from
the
ambient
temperature
detected
by
the
temperature
sensor
on
the
printer
logic
card.
When
it
detects
lower
than
68°F
(20°C),
the
bubble
jet
head
unit
nozzles
are
warmed
by
the
warm-up
heaters.
0
0
00
0
/1
Nozzle
Section
,Warm-up
Heaters
/
I
I
1
11
I
Temperature
Sensors
Figure
3-18
Head;
emperature
Controller
3-17