FENIX IMVICO
TK-41 OPERATION MANUAL
19/88
2.3.1- POWER SUPPLY CONNECTOR
Attach power supply cable to the 4-pin micro connector. Verify power supply voltage
before making the connection.
NOTE:
All the 4 pins must be connected.
The minimum section for the supply wires is 1mm
2
.
Cables more than 50cm long are not recommended.
Terminal nº Signal Name
Function
1
GND
Ground
2
VCC
Printer power (24v DC)
3
VCC
Printer power (24v DC)
4
GND
Ground
Fig.2.10-
Power supply connector as seen from outside the TK41.
User side connector model:
Housing:
VHR-4N (JST or compatible)
Contacts:
SVH-21T-P1.1 (JST or compatible)
The TK-41 requires one power source: VCC (24v DC) for driving the thermal head and
motor. This voltage is internally regulated to 5V to control the electronics. The power
supply must satisfy the following conditions:
VCC:
24v DC +/- 2,4v
Example of current consumption (for the 79.5mm-wide mechanism):
Print head current consumption at a printing ratio of 25%:
(Printing ratio is defined as the number of dots/dot line (576 dots)).
1) Peak current:
Approx. 6.7 A (the moment all 160 dots are energized).
NOTE: The peak current is measured at the minimum resistive value and
at the maximum voltage.
Conditions:
VH max: Head connector terminal voltage max. 26.4V
Rmin: Head resistance value min. 626.8 Ohm.
2) Mean current
Approx. 1.75 A
(Head terminal voltage= 24V, head resistive value
R=657Ohm, print duty of 25%, mean energizing pulse width
of 248
µ
s (assumed that 50% of printed dots are energized
just before), synchronizing with 833
µ
s).
The following formula is used to obtain the head drive current:
Imean = [V(volts)/R(Ohms)] x 576dots x printing ratio x [energizing pulse width/cycle]
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2
3
4