Rev.D Product Overview Appendix D-63
TM-U675/U675P (with autocutter) Service Manual
Confidential
The magnetic reader head recognizes the magnetized characters as shown below.
The voltage waveform output from the magnetic reader head is different for each character,
making it possible to recognize each individual character.
Detection Circuits
This printer has detection circuits for paper and various mechanisms. The detection functions
are described in the table below.
Figure D-60
Figure D-61
Table D-12 Detection circuits
Detector Function
Type of
Sensor Circuit
TOF Slip detection Transparent
photo
Voltage drop of load resistor (R69) is read by the AD port of the
CPU
BOF Slip detection Transparent
photo
Voltage drop of load resistor (R68) is read by the AD port of the
CPU
Paper
ejection
Slip detection Reflective
photo
Voltage drop of load resistor (R66) is read by the AD port of the
CPU
Validation Slip detection Reflective
photo
Voltage drop of load resistor (R68) is read by the AD port of the
CPU
Paper
Insertion
Paper roll
detection
Reflective
photo
Logical judgment of voltage drop of load resistor (R147)
Near Paper
End
Paper roll
detection
Microswitch Logical judgment of switch status by the CPU port.
Voltage Power source
voltage
Voltage
potential
divider
Potential divider ratio of 24V power source voltage 1/7.2 (R71,
R76) is read by the AD port of the CPU
I
SSNN S SNN
01
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