Brother PT-2500PC, Service Manual

Page: 59 / 79

III - 9
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.
Fig. 3.2-6 Cassette Sensor Circuit
Table 3.2-2 Coded Values for Identifying Tape Cassette
1: Switch ON (ID hole closed) 0: Switch OFF (ID hole opened)
Cassette type SW1 SW2 SW3 SW4 SW5
No cassette 0 0 0 0 0
6 mm Laminated 0 0 1 0 0
Non-laminated 0 0 1 1 0
9 mm Laminated 1 1 1 0 0
Non-laminated 1 1 0 0 0
12 mm Laminated * 0 1 0 0 0
Non-laminated and iron-on 0 1 1 1 0
18 mm Laminated ** 1 0 1 1 0
Non-laminated and YS 1 0 0 0 0
Lettering and iron-on 1 1 1 0 1
24 mm Laminated 1 0 1 1 1
Non-laminated 1 0 0 0 1
*The stamp tape cassette M is included in this type.
**The stamp tape cassette L is included in this type.