Service manual

March, 09 TTPM3 - Service Manual 9
3 FUNCTIONAL DESCRIPTION
The TTPM3 connects to a host computer, for example a workstation or a PC,
through the RS232 serial interface or optional Ethernet.
The host controls the operation of the TTPM3 by means of software commands.
A microprocessor on the control board interprets the commands and generates the
necessary control and data signals.
Besides the on-line mode, you can force the TTPM3 into a self-test mode pro-
ducing a printed and encoded ticket containing information about firmware version.
3.1 Standard TTPM3 model
The figure below shows important parts of the standard printer/encoder unit. The
shaded lines indicate which stepper motor that drives the platen and the various
feed rollers.
(d) Thermal
print head
(c) Printhead
support plate
(a) Feed control roller
(n) Feed roller lower
(h) Cutter pos.
sensor
(k) Upper input
sensor
(i) After cutter
sensor
(j) Feed control
roller
(z) Stepper motor
(ab) Engagement solenoid
(y) Engagement solenoid
lower entry
(x) Engagement
solenoid upper entry
(ac) Feed control slide
(s) Feed control slide
(t) Stepper motor
(r) Rocker
(m) Lower input sensor
(f) Write head
(g) Read head
(ad) Knife
(ae) Carrier wheel
(v) Cutter-home
sensor
FRONT
BACK
(b) Feed belts (O-rings)
(p) Retaining
roller
(q) Retaining
plate
(o) Feed roller
upper
(l) Top-of-
form sensor
(aa) Printhead engage-
ment arm
(e) Print
platen
(u) Cutter motor
SW95040B
Figure 4. Standard printer/encoder unit mechanics