Driver Section; Needle Driver - Tally T2265 SprintPro Maintenance Manual

Functional Description
How to test the printer's
function without Mains
Input
3.3.1.2

Driver Section

3.3.1.3

Needle Driver

Principle
There is the possibility to run a test procedure without line voltage. To perform this
run following steps:
– Disconnect printer from outlet and switch printer off
– Give DC Voltage (33 V) to jumpers connector x4 on the main board.
– If you supply the logic with 1 A DC you are able to handle the panel, the motors
and the printhead (only moves)
– If you supply the logic with 3 A DC you are able to make self test printout (e.g.
ASCII tree; no graphic printing please), also.
Described steps have to be carried out very carefully.
STOP
This part is mainly claimed of the PPU 96 ASIC 47537.
This highly integrated circuit serves both to activate further actuators as well as to
recognise and pick up sensors or status signals. This means that this IC sonsists
mainly of registers, latches and selective logic.
Also the motor drivers and the needle drivers are controlled by PPU 96.
The needle driver signals (NOxx) are connected to the printhead via plug X14/X2 of
the connection board to the printhead adapter board. The following diagrams will
show the voltage/current relation, the flow of the current in several conditions and the
principle of driver circuit.
Vcc
R
To ADC
9 x R
N1 N2 N3
_
+
Electronic Functions
needle magnet
N25
3-19