Euro-500TX Handy
© Elcom, s. r. o.
Service manual
32
3.7.2 Terminal for the sensors
3.8 Cleaning of the printing head
1. Lift the printing head into top position and remove the paper tapes.
2. Clean the head or the cylinder using the cotton swab dipped in methanol, IPA, etc.
3. After cleaning, insert both paper tapes and lower the head into original position.
Caution:
1. Never clean the printing head using sandpaper, knives or scissors – this can lead to printing head dam-
age.
2. Ensure the alcohol evaporated entirely prior printing.
3. Clean the head only when the ECR is off.
4. Lift the head lightly as the printer mechanism allows. Do not use crude force.
Terminal #
Signal name
Function
23
STB 3
Activation signal #3
24
DATA IN
Print data serial input
25
VH
Power supply of printer power circuits
26
VH
Power supply of printer power circuits
27
VH
Power supply of printer power circuits
28
VH
Power supply of printer power circuits
Tab. 3.5 Thermal head connector pin description (cntd.)
Pin No.
Terminal name
Note
1
Photo-transistor collector
Paper sensor
2
Led cathode
3
Led anode
4
Photo-transistor emitter
5
Head-up sensor - collector
Head-up sensor
6
Emitter of cathode of diode (GND)
7
Anode of diode
Tab. 3.6 Sensor terminal pin description
1
2
3
4
5
6
7
Paper presence sensor
Head position sensor
Fig. 3.11 Sensor connexion to the connector
