Printhead - Tally T2265 SprintPro Maintenance Manual

Functional Description
3.3.22

Printhead

There are two different printheads available:
– NDK9/24 (approx. 1800 Hz max)
– NDK11/24 (approx. 2400 Hz max)
This modern ballistic printhead is driven by the needle driver section on the main
board (FT5763M, signals N1x–N24x).
The needle control is performed by the PPU96 (47537).
General:
The system to shoot a needle is activated by a current through a coil of the system.
One end of each coil of the needle magnet is connected to the voltage UN (+33) V
via the head cable. The return lines of the other ends of the coils are connected to
the needle drivers of the driver board. In the needle driver chip; controlled by the
program; the return lines are connected for a short time to GND. If the expected
needle current is reached the current will be chopped by hardware control.
Papier
Paper
Gegenlage
Farbband
Ribbon
Platen
The printhead is connected to X2 and X14 on the Connection Board. (Take care not
to loosen the pull relief clamp at the plugs when replacing printhead!).
Electronic Functions
Feder
Needle Guide
Spring
Nadelführung
Nadel
Needle
Druckkopf
Print head
Ballistic
Klappanker
Anchor
Fuss
Foot
Magnet
Elektro-
magnet
3-37