Cassette Sensor Circuit - Brother PT-2500PC Service Manual

3.2.6

Cassette Sensor Circuit

Fig. 3.2-6 shows the cassette sensor circuit which reads the five sensor switches.
Loading a tape cassette pushes down some of those five switches to turn them on while
keeping other switches off depending upon the ID holes provided in the tape cassette. If
a certain ID hole is closed, the corresponding sensor switch goes on.
By receiving the states of those sensor switches, the CPU identifies the tape width and
ink ribbon type of the tape cassette, as listed in Table 3.2-2.
Cassette type
6 mm
9 mm
12 mm
18 mm
24 mm
Fig. 3.2-6 Cassette Sensor Circuit
Table 3.2-2 Coded Values for Identifying Tape Cassette
1: Switch ON (ID hole closed)
No cassette
Laminated
Non-laminated
Laminated
Non-laminated
Laminated
Non-laminated and iron-on
Laminated
Non-laminated and YS
Lettering and iron-on
Laminated
Non-laminated
SW1 SW2
0 0
0 0
0 0
1 1
1 1
* 0 1
0 1
** 1 0
1 0
1 1
1 0
1 0
*The stamp tape cassette M is included in this type.
**The stamp tape cassette L is included in this type.
III - 9
0: Switch OFF (ID hole opened)
SW3 SW4
0 0
1 0
1 1
1 0
0 0
0 0
1 1
1 1
0 0
1 0
1 1
0 0
SW5
0
0
0
0
0
0
0
0
0
1
1
1