III
- 13
3.2.8
Cassette Sensor Circuit
Figure 3.2-14 shows the cassette sensor circuit. This circuit reads the states of the five
sensor switches which come on or go off depending upon the ID holes provided in the
tape cassette currently mounted.
By receiving the states of those sensor switches, the CPU identifies the tape cassette
type (tape width and ink ribbon type).
If an ID hole is open, the sensor switch goes off.
Table 3.2-1 lists the coded values for identifying the tape cassette type.
Figure 3.2-14 Cassette Sensor Circuit
Table 3.2-1 Coded values for Identifying Tape Cassette Type
0: Switch ON (ID hole closed)
1: Switch OFF (ID hole opened)
SW1 SW2 SW3 SW4 SW5
Cassette type
Tape width
0
0
0
0
0
No cassette loaded
1
1
1
1
1
1
1
0
1
0
0
1
1
1
0
0
0
1
1
1
1
0
1
0
1
0
1
0
0
1
Laminated tape cassette
Laminated tape cassette
Non-Laminated tape cassette
Non-Laminated tape cassette
Non-Laminated thermal film tape cassette
Iron-on transfer tape cassette &
Instant lettering tape cassette
18 mm
0
0
1
1
0
1
0
1
0
0
Laminated tape cassette
Non-Laminated tape cassette
12 mm
1
1
1
1
1
0
0
0
0
0
Laminated tape cassette
Non-Laminated tape cassette
9 mm
0
0
0
0
1
1
0
1
0
0
Laminated tape cassette
Non-Laminated tape cassette
6 mm
Other settings
Regarded as "No cassette loaded"
Position of
Sensor Switches
SW5
SW4
SW2
SW3
SW1
Summary of Contents for PT 1800 - P-Touch 1800 Thermal Transfer Printer
Page 1: ...SERVICE MANUAL MODEL PT 1800 1810 ...
Page 2: ...SERVICE MANUAL MODEL PT 1800 1810 ...
Page 5: ...CHAPTER I SPECIFICATIONS ...
Page 10: ...I 4 n U S A Canada n U K Figure 1 1 2 Key Arrangement 1 ...
Page 11: ...I 5 n Germany n France Figure 1 1 2 Key Arrangement 2 ...
Page 12: ...I 6 n Belgium Figure 1 1 2 Key Arrangement 3 ...
Page 15: ...CHAPTER II MECHANISMS ...
Page 43: ...CHAPTER III ELECTRONICS ...
Page 47: ...III 3 Figure 3 2 1 Block Diagram of Main PCB ...
Page 49: ...III 5 Figure 3 2 3 Timing Scheme and Waveforms of Key Scanning by the CPU ...
Page 62: ...CHAPTER IV TROUBLESHOOTING ...
Page 65: ...IV 2 4 1 3 Troubleshooting Flows 1 Tape feeding failure ...
Page 66: ...IV 3 ...
Page 67: ...IV 4 ...
Page 68: ...IV 5 2 Printing failure ...
Page 69: ...IV 6 ...
Page 70: ...IV 7 ...
Page 71: ...IV 8 3 Powering failure Nothing appears on the LCD ...
Page 72: ...IV 9 ...
Page 73: ...IV 10 ...
Page 74: ...IV 11 4 No key entry possible ...
Page 75: ...IV 12 5 Abnormal LCD indication ...
Page 76: ...IV 13 6 Tape cassette type not identified ...
Page 77: ...APPENDICES Circuit Diagrams A Main PCB B Power Supply PCB ...