3 ] Identification Of Tape Cassette Type - Brother PT-1090 Service Manual

[ 3 ] Identification of Tape Cassette Type

The cassette sensor PCB has four sensor switches (SW2, SW3, SW6 and SW7).
Loading a tape cassette turns on some of those switches while keeping others off
depending upon the ID encoding holes provided in the tape cassette currently loaded.
If an encoding ID hole is closed, the corresponding sensor switch goes on.
With the states of those sensor switches, the CPU identifies the tape width and tape
cassette type, as listed below.
Table 2.2-3 Coded Value for Identifying Tape Cassette Type
Tape width
- No tape cassette loaded
3.5mm Non-laminate tape cassette
Laminate tape cassette
6mm
Non-laminate tape cassette
Laminate tape cassette
9mm
Non-laminate tape cassette
Laminate tape cassette
12mm
Non-laminate tape cassette
Fabric tape cassette
Cassette type
II - 13
0: Switch OFF (ID hole opened)
1: Switch ON (ID hole closed)
SW2 SW3
0 0
0 1
0 1
0 1
1 1
1 0
1 0
1 1
Position of the cassette sensor switches
SW2
SW6 SW7
0 0
1 1
0 0
0 1
0 0
0 1
0 0
0 1
SW6
SW7
SW3