Epson TM-H6000 Service Manual page 153

Confidential
Detection Circuits
This printer has detection circuits for paper and various mechanisms. The detection functions
are described in the table below.
TableD-11 Detection circuits
Detector Type
TOF Slip detection
BOF Slip detection
Paper Slip detection
ejection
Validation Slip detection
Paper Paper roll
Insertion detection
Near Paper Paper roll
End detection
Voltage Power source
voltage
Impact Head Head
Temperature temperature
Thermal Head Head
Temperature temperature
Carriage Mechanism
Motor
Step-Out
Home Mechanism
Position
Lever Timing Mechanism
Detector
Front Cover Case
Rear Cover Case
Rear Cover Case
TM-H6000
EP Timing EP unit
Pulse
EP Reset EP unit
DIPSW
Appendix D-62 Product Overview
Type of
Sensor Circuit
Transparent Voltage drop of load resistor (R69) is read by AD port of CPU
photo
Transparent Voltage drop of load resistor (R68) is read by AD port of CPU
photo
Reflective Voltage drop of load resistor (R66) is read by AD port of CPU
photo
Reflective Voltage drop of load resistor (R68) is read by AD port of CPU
photo
Reflective Logical judgment of voltage drop of load resistor (R147)
photo
Micro switch Logical judgment of switch status by the CPU port.
Voltage Potential divider ratio of 24V power source voltage 1/7.2 (R71,
potential R76) is read by the AD port of the CPU
divider
Thermistor VCC potential voltage ratio of thermistor resistance value and
R72 is read by the AD port of the CPU
Thermistor VCC potential voltage ratio of thermistor resistance value and
R126 is read by the AD port of the CPU
Transparent Base of Q50 is driven by voltage drop of load resistor (R90);
photo phase data with no delay is taken out; and logical judgment is
performed by the GA port
Photo IC Logical judgment of photo IC output is performed by the GA
port.
Photo IC Logical judgment of photo IC output is performed by the GA
port.
Transparent Logical judgment of load resistor (R88) voltage drop is
photo performed by GA port.
Transparent This signal is used for thermal unit sensor.
photo
Photo IC Logical judgment of photo IC output is performed by the GA
port.
Tacho-gene Waveform shaping (Q19) of sine wave output, and processing
by the CPU interrupt port with hysteresis (U28)
Read switch Logical judgment of the GA port with time constant.
DIPSW Pull-up by resistor group (RM1, 2, 3, 4). Reading is performed at
On. Logical judgment is performed by the CPU, GA.
Rev. A